Abstract Biobased dihydroxy-terminated aliphatic copolyesters were synthesized from melt-polycondensation of 1,6-adipic acid with 1,6-hexanediol and 1,10-decanediol. The isodimorphic behavior of the copolyesters was explored to identify the pseudo-eutectic copolyester, which was selected as macro-initiator for ring opening polymerization of l -lactide to prepare poly( l -lactide)-b-poly(hexamethylene-co-decamethylene adipate)-b-poly( l -lactide) (PLLA-b-PHDA-b-PLLA) triblock copolymers varying PLLA block length. The blocky structure was confirmed by GPC and NMR, and the influence of PLLA block length on physical and mechanical properties was investigated. Impact testing showed that the impressive impact strength was achieved, that is, the values of PLLA10-PHDA-PLLA10 and PLLA20-PHDA-PLLA20 were largely enhanced to 357.2 J/m and 259.6 J/m, respectively, about 9–12 times greater than that of PLLA homopolymer (28.6 J/m). SEM micrographs of impact fractured surface showed that the triblock copolymers underwent a transition from brittle fracture of neat PLLA to ductile fracture, which is attributed to the introduction of flexible aliphatic polyester as middle soft building block of triblcok copolymers. This work demonstrated isodimorphic aliphatic copolyesters as midblock of PLLA-based triblock fully biobased biodegradable copolymers towards highly toughened PLLA material.

中文翻译：

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同二晶型脂肪族共聚酯作为聚（L-丙交酯）基三嵌段共聚物的中间嵌段，极大地提高了冲击韧性

摘要 1,6-己二酸与1,6-己二醇和1,10-癸二醇熔融缩聚合成了生物基二羟基封端脂肪族共聚酯。研究了共聚多酯的同二晶行为以鉴定拟共晶共聚多酯，该共聚多酯被选为左旋丙交酯开环聚合制备聚（l-丙交酯）-b-聚（六亚甲基-共-癸二酸己二酸酯）的大分子引发剂)-b-聚(l-丙交酯) (PLLA-b-PHDA-b-PLLA) 三嵌段共聚物，不同 PLLA 嵌段长度。块状结构通过 GPC 和 NMR 确认，并研究了 PLLA 嵌段长度对物理和机械性能的影响。冲击测试表明，达到了令人印象深刻的冲击强度，即 PLLA10-PHDA-PLLA10 和 PLLA20-PHDA-PLLA20 的值大大提高到 357.2 J/m 和 259.6 J/m，分别比 PLLA 均聚物 (28.6 J/m) 高约 9-12 倍。冲击断裂表面的 SEM 显微照片表明，三嵌段共聚物经历了从纯 PLLA 的脆性断裂到韧性断裂的转变，这归因于引入了柔性脂肪族聚酯作为 triblcok 共聚物的中间软结构单元。这项工作证明了同二晶脂肪族共聚酯作为基于 PLLA 的三嵌段完全生物基生物可降解共聚物的中间嵌段，用于高度增韧的 PLLA 材料。这归因于引入了柔性脂肪族聚酯作为 triblcok 共聚物的中间软结构单元。这项工作证明了同二晶脂肪族共聚酯作为基于 PLLA 的三嵌段完全生物基生物可降解共聚物的中间嵌段，用于高度增韧的 PLLA 材料。这归因于引入了柔性脂肪族聚酯作为 triblcok 共聚物的中间软结构单元。这项工作证明了同二晶脂肪族共聚酯作为基于 PLLA 的三嵌段完全生物基生物可降解共聚物的中间嵌段，用于高度增韧的 PLLA 材料。