聚合物
材料科学
结晶度
差示扫描量热法
高分子化学
极限抗拉强度
延伸率
热重分析
摩尔质量分布
复合材料
化学工程
热力学
物理
工程类
作者
Tanin Nanok,Natthatida Khanom,Pimpa Hormnirun,Chawakorn Chansaenroch,Apirat Laobuthee
标识
DOI:10.1002/slct.202301046
摘要
Abstract Poly(L‐lactide) with various architectures and molecular weights have been studied with respect to their thermal and mechanical properties. Their synthesis has been performed with an aluminum salen catalyst, which allows to obtain linear chains, tetrahedral 4‐arm stars and stars with two linked tetrahedra with 3 arms each, all with defined molecular weights. The polymers are characterized by their molecular weight distributions and then subjected to differential scanning calorimetry and thermogravimetric analyses, which show differences in the characteristic temperatures of not more than 10 degrees. The crystallinity index clearly increases with the weight of the chains with only a minor dependency on the topology. Thin films of the polymers are studied with respect to their elongation at break, their tensile strength, and their moduli. The elongation is most sensitive to the polymer type with a 15‐fold increase between the shortest linear polymer and the 6‐arm star polymer with the longest chains.
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