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01.09.2022 | Original Paper

Kinetics of thermal degradation, adhesion and dynamic-mechanical properties of flexible polyamine-epoxy systems

verfasst von: Hossein Abdollahi, Ali Samadi, Farzaneh Amiri, Vahid Mousapour-Khaneshan, Payam Zarrintaj, Majid Kavanlouei

Erschienen in: Journal of Polymer Research | Ausgabe 9/2022

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Abstract

The properties of the epoxy resin can be adjusted over a wide range based on the ingredient selection. In this work, kinetics of thermal degradation, adhesion, and dynamic-mechanical properties of polyetheramine (PEA)-modified epoxy networks have been discussed. Two types of PEAs, namely poly(ethylene glycol) amine (PEG-AM) and poly(propylene glycol) amine (PPG-AM), with molecular weights of 200 g/mol and 400 g/mol, were applied in epoxy modification. According to dynamic mechanical analysis (DMA) measurements, the incorporation of PEAs at 15 phr decreased crosslinking density (ν) and glass transition temperature (T_g) of the networks by 35.3% and 31.4%, respectively. The values of T_g obtained from Fox-equation for PEA-modified networks were overestimated, demonstrating enhanced interaction in the system. The thermal durability of the epoxy networks was investigated using thermo-gravimetric analysis (TGA), and activation energy of decomposition (E_α) was estimated by the integral isoconversional approach. The E_α values of the epoxy/amine system decreased from 199.3 kJ/mol to 165 kJ/mol with the incorporation of 15 phr PEG₄₀₀-AM into the epoxy network. The adhesion behavior of the samples was studied using the single lap joint (SLJ) test, where two kinds of behaviors were observed in contradiction to mechanical properties. The sample with 15 phr PEG₂₀₀-AM had a relatively higher lap shear strength (15.46 MPa), while the one with 15 phr PEG₄₀₀-AM had the highest toughness but lower lap shear strength of 12.41 MPa. This study opens new horizons to design high-performance epoxy adhesives and composites.

Vorheriger Artikel A low-cost and environmental-friendly microperforated structure based on jute fiber and polypropylene for sound absorption

Nächster Artikel Structure and mechanical properties of Poly(styrene-co-acrylate)/cellulose nanocrystals co-continuous composites via one-pot pickering emulsion polymerization

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Titel: Kinetics of thermal degradation, adhesion and dynamic-mechanical properties of flexible polyamine-epoxy systems
verfasst von: Hossein Abdollahi
Ali Samadi
Farzaneh Amiri
Vahid Mousapour-Khaneshan
Payam Zarrintaj
Majid Kavanlouei
Publikationsdatum: 01.09.2022
Verlag: Springer Netherlands
Erschienen in: Journal of Polymer Research / Ausgabe 9/2022
Print ISSN: 1022-9760
Elektronische ISSN: 1572-8935
DOI: https://doi.org/10.1007/s10965-022-03241-w

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