Skip to main content
Erschienen in: Journal of Polymer Research 6/2013

01.06.2013 | Original Paper

In situ atom transfer radical polymerization of styrene in the presence of nanoporous silica aerogel: Kinetic study and investigation of thermal properties

verfasst von: Seyed-Ataollah Mirshafiei-Langari, Vahid haddadi-Asl, Hossein Roghani-Mamaqani, Masoud Sobani, Khezrollah Khezri

Erschienen in: Journal of Polymer Research | Ausgabe 6/2013

Einloggen

Aktivieren Sie unsere intelligente Suche, um passende Fachinhalte oder Patente zu finden.

search-config
loading …

Abstract

Atom transfer radical polymerization (ATRP) of styrene was performed at 110 °C in the presence of organically modified silica aerogel. A hydrophobic silica aerogel was prepared by a two-step, acid–base catalyzed sol–gel polymerization of tetraethoxysilane (TEOS) and surface modification by hexamethyldisilazane (HMDS) at the ambient pressure drying (APD) condition. Fourier transform infrared spectroscopy (FTIR), nitrogen adsorption/desorption, thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were employed to characterize the silica aerogel. Kinetics of styrene ATRP was evaluated in the presence of silica aerogel. Molecular weight and molecular weight distribution were determined by gel permeation chromatography (GPC). There is a critical silica aerogel content that polymerization rate reaches to its lowest level. Thus, the sample with 1 wt% of silica aerogel shows minimum kapp with respect to the neat polystyrene. Differential scanning calorimetry (DSC) results reveals that competition between chains mobility and increase of molecular weight by addition of silica aerogel content results in an inconsiderable variation of the Tg value. The nanocomposite with 1 wt% of silica aerogel shows minimum Tg value (81.4 °C) respect to near polystyrene (94 °C). Transmission electron microscopy (TEM) was used to exhibit the pore size distribution of silica aerogel and either the disappearing of pores by a layer of polystyrene after polymerization.

Sie haben noch keine Lizenz? Dann Informieren Sie sich jetzt über unsere Produkte:

Springer Professional "Wirtschaft+Technik"

Online-Abonnement

Mit Springer Professional "Wirtschaft+Technik" erhalten Sie Zugriff auf:

  • über 102.000 Bücher
  • über 537 Zeitschriften

aus folgenden Fachgebieten:

  • Automobil + Motoren
  • Bauwesen + Immobilien
  • Business IT + Informatik
  • Elektrotechnik + Elektronik
  • Energie + Nachhaltigkeit
  • Finance + Banking
  • Management + Führung
  • Marketing + Vertrieb
  • Maschinenbau + Werkstoffe
  • Versicherung + Risiko

Jetzt Wissensvorsprung sichern!

Springer Professional "Technik"

Online-Abonnement

Mit Springer Professional "Technik" erhalten Sie Zugriff auf:

  • über 67.000 Bücher
  • über 390 Zeitschriften

aus folgenden Fachgebieten:

  • Automobil + Motoren
  • Bauwesen + Immobilien
  • Business IT + Informatik
  • Elektrotechnik + Elektronik
  • Energie + Nachhaltigkeit
  • Maschinenbau + Werkstoffe




 

Jetzt Wissensvorsprung sichern!

Literatur
1.
Zurück zum Zitat Lee LJ, Zeng C, Cao X, Han X, Shen J, Xu G (2005) Polymer nanocomposite foams. Compos Sci Technol 65:2344–2363CrossRef Lee LJ, Zeng C, Cao X, Han X, Shen J, Xu G (2005) Polymer nanocomposite foams. Compos Sci Technol 65:2344–2363CrossRef
2.
Zurück zum Zitat Manias E (2007) Nanocomposites: Stiffer by design. Nat Mater 6(1):9–11CrossRef Manias E (2007) Nanocomposites: Stiffer by design. Nat Mater 6(1):9–11CrossRef
3.
Zurück zum Zitat Mai Y-W, Yu Z-Z: Polymer Nanocomposites. Woodhead Publication (2006) Mai Y-W, Yu Z-Z: Polymer Nanocomposites. Woodhead Publication (2006)
4.
Zurück zum Zitat Pinnavaia TJ, Beall GW (2001) Polymer-clay nanocomposites. Wiley Pinnavaia TJ, Beall GW (2001) Polymer-clay nanocomposites. Wiley
5.
Zurück zum Zitat Lee KM, Han CD (2003) Rheology of organoclay nanocomposites: Effects of polymer matrix/organoclay compatibility and the gallery distance of organoclay. Macromolecules 36:7165–7178CrossRef Lee KM, Han CD (2003) Rheology of organoclay nanocomposites: Effects of polymer matrix/organoclay compatibility and the gallery distance of organoclay. Macromolecules 36:7165–7178CrossRef
6.
Zurück zum Zitat Akelah A, Moet A (1996) Polymer-clay nanocomposites: Free-radical grafting of polystyrene on to organophilic montmorillonite interlayers. J Mater Sci 31:3589–3596 Akelah A, Moet A (1996) Polymer-clay nanocomposites: Free-radical grafting of polystyrene on to organophilic montmorillonite interlayers. J Mater Sci 31:3589–3596
7.
Zurück zum Zitat Wan X, Ying S (2000) Controlled radical polymerization catalyzed by CuCl/BDE complex in water medium. I. Polymerization of styrene and synthesis of poly(St-b-MMA). J Appl Polym Sci 75:802–807CrossRef Wan X, Ying S (2000) Controlled radical polymerization catalyzed by CuCl/BDE complex in water medium. I. Polymerization of styrene and synthesis of poly(St-b-MMA). J Appl Polym Sci 75:802–807CrossRef
8.
Zurück zum Zitat Nishikawa T, Kamigaito M, Sawamoto M (1999) Living radical polymerization in water and alcohols: Suspension polymerization of methyl methacrylate with RuCl2(PPh3)3 complex. Macromolecules 32:2204–2209CrossRef Nishikawa T, Kamigaito M, Sawamoto M (1999) Living radical polymerization in water and alcohols: Suspension polymerization of methyl methacrylate with RuCl2(PPh3)3 complex. Macromolecules 32:2204–2209CrossRef
9.
Zurück zum Zitat Qiu J, Gaynor SG, Matyjaszewski K (1999) Emulsion polymerization of n-Butyl methacrylate by reverse atom transfer radical polymerization. Macromolecules 32:2872–2875CrossRef Qiu J, Gaynor SG, Matyjaszewski K (1999) Emulsion polymerization of n-Butyl methacrylate by reverse atom transfer radical polymerization. Macromolecules 32:2872–2875CrossRef
10.
Zurück zum Zitat Wenping W, Xiaoxiao J, Ming F, Hang J (2011) Synthesis of core-shell particles by batch emulsion polymerization of styrene and octavinyl polyhedral oligomeric silsesquioxane. J Polym Res 18(1):13–17CrossRef Wenping W, Xiaoxiao J, Ming F, Hang J (2011) Synthesis of core-shell particles by batch emulsion polymerization of styrene and octavinyl polyhedral oligomeric silsesquioxane. J Polym Res 18(1):13–17CrossRef
11.
Zurück zum Zitat Khezri K, Haddadi-Asl V, Roghani-Mamaqani H, Salami-Kalajahi M (2012) Encapsulation of organomodified montmorillonite with PMMA via in situ SR&NI ATRP in miniemulsion. J Polym Res 19:9868CrossRef Khezri K, Haddadi-Asl V, Roghani-Mamaqani H, Salami-Kalajahi M (2012) Encapsulation of organomodified montmorillonite with PMMA via in situ SR&NI ATRP in miniemulsion. J Polym Res 19:9868CrossRef
12.
Zurück zum Zitat Xia J, Johnson T, Gaynor SG, Matyjaszewski K, DeSimone J (1999) Atom transfer radical polymerization in supercritical carbon dioxide. Macromolecules 32:4802–4805CrossRef Xia J, Johnson T, Gaynor SG, Matyjaszewski K, DeSimone J (1999) Atom transfer radical polymerization in supercritical carbon dioxide. Macromolecules 32:4802–4805CrossRef
13.
Zurück zum Zitat Roghani-Mamaqani H, Haddadi-Asl V, Salami-Kalajahi M (2012) In situ controlled radical polymerization: A review on synthesis of well-defined nanocomposites. Polym Rev 52:142–188CrossRef Roghani-Mamaqani H, Haddadi-Asl V, Salami-Kalajahi M (2012) In situ controlled radical polymerization: A review on synthesis of well-defined nanocomposites. Polym Rev 52:142–188CrossRef
14.
Zurück zum Zitat Matyjaszewski K, Xia J (2001) Atom transfer radical polymerization. Chem Rev 101:2921–2990CrossRef Matyjaszewski K, Xia J (2001) Atom transfer radical polymerization. Chem Rev 101:2921–2990CrossRef
15.
Zurück zum Zitat Roghani-Mamaqani H, Haddadi-Asl V, Najafi M, Salami-Kalajahi M (2012) Confinement effect of nanoclay platelets on the kinetics of polystyrene prepared via ATRP. J Appl Polym Sci 123:409–417CrossRef Roghani-Mamaqani H, Haddadi-Asl V, Najafi M, Salami-Kalajahi M (2012) Confinement effect of nanoclay platelets on the kinetics of polystyrene prepared via ATRP. J Appl Polym Sci 123:409–417CrossRef
16.
Zurück zum Zitat Roghani-Mamaqani H, Haddadi-Asl V, Najafi M, Salami-Kalajahi M (2011) Preparation of tailor-made polystyrene nanocomposite with mixed clay-anchored and free chains via atom transfer radical polymerization. AICHE J 57:1873–1881CrossRef Roghani-Mamaqani H, Haddadi-Asl V, Najafi M, Salami-Kalajahi M (2011) Preparation of tailor-made polystyrene nanocomposite with mixed clay-anchored and free chains via atom transfer radical polymerization. AICHE J 57:1873–1881CrossRef
17.
Zurück zum Zitat Rahimi-Razin S, Haddadi-Asl V, Salami-Kalajahi M, Behboodi-Sadabad F, Roghani-Mamaqani H (2012) Matrix grafted multi-walled carbon nanotubes/poly(methyl methacrylate) nanocomposites synthesized by in situ RAFT polymerization: A kinetics study. Int J Chem Kinet 44:555–569CrossRef Rahimi-Razin S, Haddadi-Asl V, Salami-Kalajahi M, Behboodi-Sadabad F, Roghani-Mamaqani H (2012) Matrix grafted multi-walled carbon nanotubes/poly(methyl methacrylate) nanocomposites synthesized by in situ RAFT polymerization: A kinetics study. Int J Chem Kinet 44:555–569CrossRef
18.
Zurück zum Zitat Salami-Kalajahi M, Haddadi-Asl V, Rahimi-Razin S, Behboodi-Sadabad F, Roghani-Mamaqani H, Hemmati M (2011) Investigating the effect of pristine and modified silica nanopar-ticles on the kinetics of methyl methacrylate polymerization. Chem Eng J 174:368–375CrossRef Salami-Kalajahi M, Haddadi-Asl V, Rahimi-Razin S, Behboodi-Sadabad F, Roghani-Mamaqani H, Hemmati M (2011) Investigating the effect of pristine and modified silica nanopar-ticles on the kinetics of methyl methacrylate polymerization. Chem Eng J 174:368–375CrossRef
19.
Zurück zum Zitat Salami-Kalajahi M, Haddadi-Asl V, Rahimi-Razin S, Behboodi-Sadabad F, Najafi M, Roghani-Mamaqani H (2012) A study on the properties of PMMA/silica nanocomposites prepared via RAFT polymerization. J Polym Res 19:9793–9804CrossRef Salami-Kalajahi M, Haddadi-Asl V, Rahimi-Razin S, Behboodi-Sadabad F, Najafi M, Roghani-Mamaqani H (2012) A study on the properties of PMMA/silica nanocomposites prepared via RAFT polymerization. J Polym Res 19:9793–9804CrossRef
20.
Zurück zum Zitat Xiong L, Liang H, Wang R, Chen L (2011) Novel route for the synthesis of poly(2-hydroxyethyl methacrylate-co-methyl methacrylate) grafted titania nanoparticles via ATRP. J Polym Res 18:1017–1021CrossRef Xiong L, Liang H, Wang R, Chen L (2011) Novel route for the synthesis of poly(2-hydroxyethyl methacrylate-co-methyl methacrylate) grafted titania nanoparticles via ATRP. J Polym Res 18:1017–1021CrossRef
21.
Zurück zum Zitat Mohamadi S, Sharifi-Sanjani N, Foyouhi A (2012) Evaluation of graphene nanosheets influence on the physical properties of PVDF/PMMA blend. J Polym Res 20:46CrossRef Mohamadi S, Sharifi-Sanjani N, Foyouhi A (2012) Evaluation of graphene nanosheets influence on the physical properties of PVDF/PMMA blend. J Polym Res 20:46CrossRef
22.
Zurück zum Zitat Hajian M, Reisi MR, Koohmareh GA, Jam ARZ (2012) Preparation and characterization of polyvinylbutyral/graphene nanocomposite. J Polym Res 19:9966–9973CrossRef Hajian M, Reisi MR, Koohmareh GA, Jam ARZ (2012) Preparation and characterization of polyvinylbutyral/graphene nanocomposite. J Polym Res 19:9966–9973CrossRef
23.
Zurück zum Zitat Lee SH, Dreyer DR, An J, Velamakanni A, Piner RD, Park S, Zhu Y, Kim SO, Bielawski CW, Ruoff RS (2010) Polymer brushes via controlled, surface-initiated atom transfer radical polymerization (ATRP) from graphene oxide. Macroml Rapid Comm 31:281–288CrossRef Lee SH, Dreyer DR, An J, Velamakanni A, Piner RD, Park S, Zhu Y, Kim SO, Bielawski CW, Ruoff RS (2010) Polymer brushes via controlled, surface-initiated atom transfer radical polymerization (ATRP) from graphene oxide. Macroml Rapid Comm 31:281–288CrossRef
24.
Zurück zum Zitat Rouquerol J, Avnir D, Fairbridge CW, Everett DH, Haynes JM, Pernicone N, Ramsay JDF, Sing KSW, Unger KK (1994) Physical and biophysical chemistry division commission on colloid and surface chemistry including catalysis. Pure Appl Chem 66:1739–1758CrossRef Rouquerol J, Avnir D, Fairbridge CW, Everett DH, Haynes JM, Pernicone N, Ramsay JDF, Sing KSW, Unger KK (1994) Physical and biophysical chemistry division commission on colloid and surface chemistry including catalysis. Pure Appl Chem 66:1739–1758CrossRef
25.
Zurück zum Zitat Naik B, Ghosh NN (2009) A review on chemical methodologies for preparation of mesoporous silica and alumina based materials. Rec Pat Nanotech 3:213–224CrossRef Naik B, Ghosh NN (2009) A review on chemical methodologies for preparation of mesoporous silica and alumina based materials. Rec Pat Nanotech 3:213–224CrossRef
26.
Zurück zum Zitat Yin J, Kim E-S, Yang J, Deng B (2012) Fabrication of a novel thin-film nanocomposite (TFN) membrane containing MCM-41 silica nanoparticles (NPs) for water purification. J Membr Sci 423–424:238–246CrossRef Yin J, Kim E-S, Yang J, Deng B (2012) Fabrication of a novel thin-film nanocomposite (TFN) membrane containing MCM-41 silica nanoparticles (NPs) for water purification. J Membr Sci 423–424:238–246CrossRef
27.
Zurück zum Zitat He J, Shen Y, Evans DG, Duan X (2006) Tailoring the performance of polymer composites via altering the properties of the intrapore polymers of MCM-48 nanocomposites as fillers. Compos Appl Sci Manuf 37:379–384CrossRef He J, Shen Y, Evans DG, Duan X (2006) Tailoring the performance of polymer composites via altering the properties of the intrapore polymers of MCM-48 nanocomposites as fillers. Compos Appl Sci Manuf 37:379–384CrossRef
28.
Zurück zum Zitat Won J-H, Lee H-J, Yoon K-S, Hong YT, Lee S-Y (2012) Sulfonated SBA-15 mesoporous silica-incorporated sulfonated poly(phenylsulfone) composite membranes for low-humidity proton exchange membrane fuel cells: Anomalous behavior of humidity-dependent proton conductivity. Int J Hydrogen Energ 37:9202–9211CrossRef Won J-H, Lee H-J, Yoon K-S, Hong YT, Lee S-Y (2012) Sulfonated SBA-15 mesoporous silica-incorporated sulfonated poly(phenylsulfone) composite membranes for low-humidity proton exchange membrane fuel cells: Anomalous behavior of humidity-dependent proton conductivity. Int J Hydrogen Energ 37:9202–9211CrossRef
29.
Zurück zum Zitat Zhai S-R, Zheng J-L, Dong W, Sun Y-H, Deng F (2005) CTAB-assisted fabrication of mesoporous composite consisting of wormlike aluminosilicate shell and ordered MSU-S core. J Solid State Chem 178:85–92CrossRef Zhai S-R, Zheng J-L, Dong W, Sun Y-H, Deng F (2005) CTAB-assisted fabrication of mesoporous composite consisting of wormlike aluminosilicate shell and ordered MSU-S core. J Solid State Chem 178:85–92CrossRef
30.
Zurück zum Zitat Tachibana J, Chiba M, Ichikawa M, Imamura T, Sasaki Y (1998) Supramolecular hybrid composites of metalloporphyrins and fullerene encapsulated in the ordered nano-channels of FSM-16 as oxygen carriers, and photo-catalysis for selective propene oxidation towards acetone. Supramol Sci 5:281–287CrossRef Tachibana J, Chiba M, Ichikawa M, Imamura T, Sasaki Y (1998) Supramolecular hybrid composites of metalloporphyrins and fullerene encapsulated in the ordered nano-channels of FSM-16 as oxygen carriers, and photo-catalysis for selective propene oxidation towards acetone. Supramol Sci 5:281–287CrossRef
31.
Zurück zum Zitat Tsai J-C, Kuo J-F, Chen C-Y (2007) Synthesis and properties of novel HMS-based sulfonated poly(arylene ether sulfone)/silica nano-composite membranes for DMFC applications. Journal of Power Sources 174:103–113CrossRef Tsai J-C, Kuo J-F, Chen C-Y (2007) Synthesis and properties of novel HMS-based sulfonated poly(arylene ether sulfone)/silica nano-composite membranes for DMFC applications. Journal of Power Sources 174:103–113CrossRef
32.
Zurück zum Zitat Suzuki N, Kiba S, Yamauchi Y (2011) Fabrication of mesoporous silica KIT-6/polymer composite and its low thermal expansion property. Mater Lett 65:544–547CrossRef Suzuki N, Kiba S, Yamauchi Y (2011) Fabrication of mesoporous silica KIT-6/polymer composite and its low thermal expansion property. Mater Lett 65:544–547CrossRef
33.
Zurück zum Zitat Xi J, Qiu X, Zhu W, Tang X (2006) Enhanced electrochemical properties of poly(ethylene oxide)-based composite polymer electrolyte with ordered mesoporousmaterials for lithium polymer battery. Microp Mesop Mater 88:1–7CrossRef Xi J, Qiu X, Zhu W, Tang X (2006) Enhanced electrochemical properties of poly(ethylene oxide)-based composite polymer electrolyte with ordered mesoporousmaterials for lithium polymer battery. Microp Mesop Mater 88:1–7CrossRef
34.
Zurück zum Zitat Tominaga Y, Igawa S, Asai S, Sumita M (2005) Ion-conductive properties of mesoporous silica-filled composite polymer electrolytes. Electrochim Acta 50:3949–3954CrossRef Tominaga Y, Igawa S, Asai S, Sumita M (2005) Ion-conductive properties of mesoporous silica-filled composite polymer electrolytes. Electrochim Acta 50:3949–3954CrossRef
35.
Zurück zum Zitat Murakami K, Xue Y, Watanabe S, Kato T, Inoue Y, Sugawara K (2011) Synthesis of thermosensitive polymer/mesoporous silica composite and its temperature dependence of anion exchange property. J Colloid Interface Sci 354:771–776CrossRef Murakami K, Xue Y, Watanabe S, Kato T, Inoue Y, Sugawara K (2011) Synthesis of thermosensitive polymer/mesoporous silica composite and its temperature dependence of anion exchange property. J Colloid Interface Sci 354:771–776CrossRef
36.
Zurück zum Zitat Wang X-L, Mei A, Li M, Lin Y, Nan C-W (2006) Effect of silane-functionalized mesoporous silica SBA-15 on performance of PEO-based composite polymer electrolytes. Solid State Ionics 177:1287–1291CrossRef Wang X-L, Mei A, Li M, Lin Y, Nan C-W (2006) Effect of silane-functionalized mesoporous silica SBA-15 on performance of PEO-based composite polymer electrolytes. Solid State Ionics 177:1287–1291CrossRef
37.
Zurück zum Zitat Baoping L, Jinan T, Hongjian L, Yueming S, Chunwei Y (2005) Structure and infrared emissivity of polyimide/mesoporous silica composite films. J Power Sourc 178:650–654 Baoping L, Jinan T, Hongjian L, Yueming S, Chunwei Y (2005) Structure and infrared emissivity of polyimide/mesoporous silica composite films. J Power Sourc 178:650–654
38.
Zurück zum Zitat Hrubesh LW (1990) Aerogels: The world’s lightest solids. Chem Ind 24:824–827 Hrubesh LW (1990) Aerogels: The world’s lightest solids. Chem Ind 24:824–827
39.
Zurück zum Zitat Bond GC, Flamerz S (1987) Structure and reactivity of titania-supported oxides. Part 3: Reaction of isopropanol over vanadia-titania catalysts. Appl Catal 33:219–230CrossRef Bond GC, Flamerz S (1987) Structure and reactivity of titania-supported oxides. Part 3: Reaction of isopropanol over vanadia-titania catalysts. Appl Catal 33:219–230CrossRef
40.
Zurück zum Zitat Fricke J, Emmerling A (1992) Aerogels, preparation, properties, applications, chemistry. Spectr Appl Sol–gel Glass 77:37–87CrossRef Fricke J, Emmerling A (1992) Aerogels, preparation, properties, applications, chemistry. Spectr Appl Sol–gel Glass 77:37–87CrossRef
41.
Zurück zum Zitat Mulder CAM, Van Lierop JG (1986) Preparation, densification and characterization of autoclave dried SiO2 gels. In: Fricke J. (ed.) Aerogels, 68–75 Mulder CAM, Van Lierop JG (1986) Preparation, densification and characterization of autoclave dried SiO2 gels. In: Fricke J. (ed.) Aerogels, 68–75
42.
Zurück zum Zitat Rao AV, Sakhare HM, Tamhankar AK, Shinde ML, Gadave DB, Wagh PB (1999) Influence of N, N-dimethylformamide additive on the physical properties of citric acid catalyzed TEOS silica aerogels. Mater Chem Phys 60:268–273CrossRef Rao AV, Sakhare HM, Tamhankar AK, Shinde ML, Gadave DB, Wagh PB (1999) Influence of N, N-dimethylformamide additive on the physical properties of citric acid catalyzed TEOS silica aerogels. Mater Chem Phys 60:268–273CrossRef
43.
Zurück zum Zitat Li WC, Lu AH, Guo SC (2002) Control of mesoporous structure of aerogels derived from cresol-formaldehyde. J Colloid Interface Sci 254(1):153–157CrossRef Li WC, Lu AH, Guo SC (2002) Control of mesoporous structure of aerogels derived from cresol-formaldehyde. J Colloid Interface Sci 254(1):153–157CrossRef
44.
Zurück zum Zitat Pierre AC, Elaloui E, Pajonk GM (1998) Comparison of the structure and porous texture of alumina gels synthesized by different methods. Langmuir 14:66–73CrossRef Pierre AC, Elaloui E, Pajonk GM (1998) Comparison of the structure and porous texture of alumina gels synthesized by different methods. Langmuir 14:66–73CrossRef
Metadaten
Titel
In situ atom transfer radical polymerization of styrene in the presence of nanoporous silica aerogel: Kinetic study and investigation of thermal properties
verfasst von
Seyed-Ataollah Mirshafiei-Langari
Vahid haddadi-Asl
Hossein Roghani-Mamaqani
Masoud Sobani
Khezrollah Khezri
Publikationsdatum
01.06.2013
Verlag
Springer Netherlands
Erschienen in
Journal of Polymer Research / Ausgabe 6/2013
Print ISSN: 1022-9760
Elektronische ISSN: 1572-8935
DOI
https://doi.org/10.1007/s10965-013-0163-z

Weitere Artikel der Ausgabe 6/2013

Journal of Polymer Research 6/2013 Zur Ausgabe

    Marktübersichten

    Die im Laufe eines Jahres in der „adhäsion“ veröffentlichten Marktübersichten helfen Anwendern verschiedenster Branchen, sich einen gezielten Überblick über Lieferantenangebote zu verschaffen.