材料科学
增容
聚酰胺
复合材料
挤压
丙交酯
结晶
相容性(地球化学)
艾氏冲击强度试验
聚合物混合物
共聚物
高分子化学
聚合物
化学工程
极限抗拉强度
工程类
作者
Amulya Raj,K. Prashantha,Cédric Samuel
摘要
ABSTRACT The melt compatibility between poly(L‐lactide) (PLA) and polyamides (PAs) with related thermomechanical properties is addressed. A particular attention is paid to four commercial PAs with extrusion processing temperatures close to PLA (PA10‐10 to PA12). PLA/PA blend morphologies without a compatibilizer are first revealed by scanning electron microscopy. PA12 displays the best droplet dispersion into PLA ( D n 700 nm), whereas a poor interfacial adhesion is attested for PLA/PA10‐10 blends. Interfacial tensions corroborate the PLA/PA10‐10 incompatibility (γ 12 9 mN/m, 240 °C) with decreasing γ 12 in the order PLA/PA10‐10 > PLA/PA11 > PLA/PA12 (γ 12 2 mN/m). Surface tensions confirm the highest compatibility between PLA and PA12. Ductilities, toughnesses, and thermal resistances of PLA/PA blends are evaluated up to 40‐wt % PA. Brittle‐to‐ductile transitions are observed for PA content higher than 30‐wt % with the highest ductility for PLA/PA12, in accordance with their enhanced compatibility. Impact strengths display similar trends with a twofold increase for PLA/PA12. An outstanding synergy between PLA and PA is highlighted by dynamic mechanical analyses with heat deflection up to 130 °C for PLA/PA blends. The synergy arises from a peculiar crystallization of PLA in the presence of PA. PLA/PA morphologies/interfaces can be consequently tuned by an appropriate PA choice with interesting improvements of thermomechanical properties for high‐performance/durable applications. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48440.
科研通智能强力驱动
Strongly Powered by AbleSci AI