Crystallization and Properties of Poly(lactide)/Poly(δ-valerolactone) Alternating Supramolecular Copolymers Adjusted by Stereocomplexation,ACS Omega

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Crystallization and Properties of Poly(lactide)/Poly(δ-valerolactone) Alternating Supramolecular Copolymers Adjusted by Stereocomplexation
ACS Omega ( IF 3.7 ) Pub Date : 2019-06-26 00:00:00 , DOI: 10.1021/acsomega.9b00380
Xuetao Shi ₁ , Zhanxin Jing ₂ , Guangcheng Zhang ₁

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The crystallization behavior of a series of synthesized polylactide (PLA)/poly(δ-valerolactone) (PVL) supramolecular copolymers with 2-ureido-4[1H]-pyrimidinone (UPy) groups is investigated by differential scanning calorimetry and X-ray diffraction. The stereocomplexation of PLA-based supramolecular polymers (SMPs) is strongly related to the block length, L/D ratios, and the UPy groups. Both the increase of the PLA block length and the self-complementary hydrogen bonding of the UPy end groups restrain the crystallization of the PVL blocks. The stereocomplexation of PLA-SMPs is greatly promoted by UPy groups, while the homocrystallization of PLA is constrained. The dynamic mechanical analysis indicated that the enhanced stereocomplexation would lead to higher thermal resistance and mechanical properties of PLA-based SMPs.

中文翻译：

立体络合调节聚丙交酯/聚δ-戊内酯交替超分子共聚物的结晶及性能

通过差示扫描量热法和X射线研究了一系列合成的带有2-脲基-4[1H]-嘧啶酮(UPy)基团的聚丙交酯(PLA)/聚(δ-戊内酯)(PVL)超分子共聚物的结晶行为衍射。PLA 基超分子聚合物 (SMP) 的立体络合与嵌段长度、L/D 比和 UPy 基团密切相关。PLA嵌段长度的增加和UPy端基的自互补氢键抑制了PVL嵌段的结晶。UPy基团极大地促进了PLA-SMP的立体络合，而PLA的同晶化受到限制。动态力学分析表明，增强的立体络合将导致基于PLA的SMP具有更高的耐热性和机械性能。

更新日期：2019-06-26

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