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Erschienen in: Cellulose 12/2021

01.07.2021 | Original Research

Influence of cotton waste and flame-retardant additives on the mechanical, thermal, and flammability properties of phenolic novolac epoxy composites

verfasst von: Suheyla Kocaman, Ulku Soydal, Gulnare Ahmetli

Erschienen in: Cellulose | Ausgabe 12/2021

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Abstract

Phenolic novolac-type epoxy (EPN) resin composites were fabricated by reinforcing with cotton waste (CtW), along with aluminum hydroxide (AH), and boric acid (BA) particles under different filler loadings. For characterization, thermogravimetric analysis, scanning electron microscopy, differential scanning calorimetry, and water sorption tests were performed on the composites. The effects of the CtW, AH, and BA contents on the thermal, flame-retardant, and mechanical properties of the composites were investigated. The triple hybrid additive (CtW:BA:AH) with a ratio of 20:5:10 wt% exhibited the best mechanical and combustion properties. The tensile strengths of this composite and the neat EPN were determined as 95.7 ± 6.92 and 96.6 ± 4.77 MPa, respectively. The T50 temperatures of the BA- and AH-doped composites were higher than that of neat EPN. The highest char percentages were observed in the triple composites, while the lowest were observed in the EPN/CtW composites. The combustion of the triple composite with a CtW:BA:AH ratio of 20:5:10 wt% was spontaneously extinguished in 37 s. Horizontal flammability testing also showed better fire resistance for the CtW/BA/AH composites over their CtW counterparts, with the highest estimated limiting oxygen index of 32.3 obtained for the 20:5:10 wt% composite. The water sorption test results show that the CtW composites had the highest hydrophilicity, especially those with 30 wt% CtW or higher, in the presence of water at room temperature.

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Metadaten
Titel
Influence of cotton waste and flame-retardant additives on the mechanical, thermal, and flammability properties of phenolic novolac epoxy composites
verfasst von
Suheyla Kocaman
Ulku Soydal
Gulnare Ahmetli
Publikationsdatum
01.07.2021
Verlag
Springer Netherlands
Erschienen in
Cellulose / Ausgabe 12/2021
Print ISSN: 0969-0239
Elektronische ISSN: 1572-882X
DOI
https://doi.org/10.1007/s10570-021-04037-9

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