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Synthesis and mechanochemical properties of biobased ABCBA-type pentablock copolymers comprising poly-d-lactide (A), poly-l-lactide (B) and poly(1,2-propylene succinate) (C)
Journal of Polymer Science ( IF 3.9 ) Pub Date : 2022-03-25 , DOI: 10.1002/pol.20210883 Yasumasa Nishiwaki 1 , Kazunari Masutani 2 , Yoshiharu Kimura 2 , Chan‐Woo Lee 3
Journal of Polymer Science ( IF 3.9 ) Pub Date : 2022-03-25 , DOI: 10.1002/pol.20210883 Yasumasa Nishiwaki 1 , Kazunari Masutani 2 , Yoshiharu Kimura 2 , Chan‐Woo Lee 3
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The ABCBA pentablock copolymers (p-d-l-PPS) comprising poly(d-lactide) (PDLA: A), poly(l-lactide) (PLLA: B) and poly(propylene succinate) (PPS: C) were successfully synthesized by two-step ring-opening polymerization (ROP) of d- and l-lactide using a dihydroxy-terminated PPS as a macro-initiator. The pentablock copolymers revealed the high stereocomplex (sc) crystallinity, thermal stability and elastomeric property in their solution-cast films. It was found that the Tg was found to be proportional to the PPS content, whereas the Tm was proportional to their average block length. The thermal resistivity of the copolymer films was found to be as high as 202°C owing to their sc formation. The copolymers also showed improved stereocomplexibility compared to the enantiomeric mixtures of triblock copolymers (PLLA-PPS-PLLA and PDLA-PPS-PDLA) having similar PLLA and PDLA chain lengths. These pentablock copolymers can afford thermoplastic elastomers or flexible plastic materials having a 100% bio-based content, showing high heat-resistive property.
中文翻译：
包含聚-d-丙交酯 (A)、聚-l-丙交酯 (B) 和聚 (1,2-丙烯琥珀酸酯) (C) 的生物基 ABCBA 型五嵌段共聚物的合成和机械化学性质
由聚（d-丙交酯）（PDLA：A）、聚（l-丙交酯）（PLLA：B）和聚（丁二酸丙二醇酯）（PPS：C）组成的ABCBA五嵌段共聚物（p - d - l -PPS）成功使用二羟基封端的 PPS 作为大分子引发剂，通过d-和l-丙交酯的两步开环聚合 (ROP) 合成。五嵌段共聚物在其溶液流延薄膜中显示出高立体络合物 (sc) 结晶度、热稳定性和弹性体性能。发现T g与 PPS 含量成正比，而T m与它们的平均块长度成正比。由于它们的 sc 形成，发现共聚物薄膜的热阻率高达 202°C。与具有相似 PLLA 和 PDLA 链长的三嵌段共聚物（PLLA-PPS-PLLA 和 PDLA-PPS-PDLA）的对映体混合物相比，该共聚物还显示出改进的立体络合性。这些五嵌段共聚物可以提供具有 100% 生物基含量的热塑性弹性体或柔性塑料材料，具有高耐热性。
更新日期：2022-03-25
中文翻译：
包含聚-d-丙交酯 (A)、聚-l-丙交酯 (B) 和聚 (1,2-丙烯琥珀酸酯) (C) 的生物基 ABCBA 型五嵌段共聚物的合成和机械化学性质
由聚（d-丙交酯）（PDLA：A）、聚（l-丙交酯）（PLLA：B）和聚（丁二酸丙二醇酯）（PPS：C）组成的ABCBA五嵌段共聚物（p - d - l -PPS）成功使用二羟基封端的 PPS 作为大分子引发剂，通过d-和l-丙交酯的两步开环聚合 (ROP) 合成。五嵌段共聚物在其溶液流延薄膜中显示出高立体络合物 (sc) 结晶度、热稳定性和弹性体性能。发现T g与 PPS 含量成正比，而T m与它们的平均块长度成正比。由于它们的 sc 形成，发现共聚物薄膜的热阻率高达 202°C。与具有相似 PLLA 和 PDLA 链长的三嵌段共聚物（PLLA-PPS-PLLA 和 PDLA-PPS-PDLA）的对映体混合物相比，该共聚物还显示出改进的立体络合性。这些五嵌段共聚物可以提供具有 100% 生物基含量的热塑性弹性体或柔性塑料材料，具有高耐热性。
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