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Biodegradable Compatibilizers for Poly(hydroxyalkanoate)/Poly(ε-caprolactone) Blends through Click Reactions with End-Functionalized Microbial Poly(hydroxyalkanoate)s
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2019-03-20 00:00:00 , DOI: 10.1021/acssuschemeng.9b00897 Takafumi Oyama 1 , Shingo Kobayashi 2 , Tetsuo Okura 3 , Shunsuke Sato 2 , Kenji Tajima 4 , Takuya Isono 4 , Toshifumi Satoh 4
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2019-03-20 00:00:00 , DOI: 10.1021/acssuschemeng.9b00897 Takafumi Oyama 1 , Shingo Kobayashi 2 , Tetsuo Okura 3 , Shunsuke Sato 2 , Kenji Tajima 4 , Takuya Isono 4 , Toshifumi Satoh 4
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Poly(hydroxyalkanoate)s (PHAs) have gained significant attention because they readily biodegrade even under environmental conditions; however, expanding the applications of these polymers to a number of fields is hindered by their brittle nature. Blending with a soft biodegradable polymer, such as poly(ε-caprolactone) (PCL), is currently the best solution for improving the toughness of a PHA material without sacrificing biodegradability; consequently, the development of biodegradable compatibilizers is strongly desired. This Article describes a systematic investigation into the compatibilizing abilities of a number of architecturally varied block copolymers (BCPs) composed of microbially derived poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (P(3HB-co-3HHx); PHBH as the A block) and PCL (as the B block), including AB-, A2B-, AB2-, ABA-, and A2BA2-type BCPs. These BCPs were precisely synthesized through the click reactions of azido-functionalized PCLs with microbially produced propargyl-end-functionalized PHBH. Transmission electron microscopy and tensile-testing experiments reveal that the mechanical properties of PHBH/PCL/BCP (= 67/23/10 wt %) ternary blends are highly dependent on the choice of BCP architecture and are closely related to their morphologies. A remarkable 5–10-fold increase in elongation at break compared to that of the BCP-free blend (PHBH/PCL = 75/25) was achieved by the addition of the ABA- or A2BA2-type BCP as the compatibilizer.
中文翻译：
通过与最终功能化微生物聚羟基脂肪酸酯的点击反应，可生物降解的相容剂，用于聚（羟基链烷酸酯）/聚（ε-己内酯）共混物
聚（羟基链烷酸酯）（PHA）已引起广泛关注，因为它们即使在环境条件下也易于生物降解。然而，由于它们的脆性，阻碍了将这些聚合物的应用扩展到许多领域。目前，与柔软的可生物降解的聚合物（例如聚（ε-己内酯）（PCL））共混是在不牺牲生物降解性的情况下提高PHA材料韧性的最佳解决方案。因此，强烈期望开发可生物降解的增容剂。本文介绍了一种系统的调查成许多微生物来源的聚（3-羟基丁酸酯组成的体系结构上改变嵌段共聚物（口岸）的相容能力共-3-羟基己酸酯）（P（3HB-共-3HHx）; PHBH（作为A嵌段）和PCL（作为B嵌段），包括AB-，A 2 B-，AB 2-，ABA-和A 2 BA 2型BCP。这些BCP是通过叠氮基官能化PCL与微生物产生的炔丙基末端官能化PHBH的点击反应精确合成的。透射电子显微镜和拉伸试验实验表明，PHBH / PCL / BCP（= 67/23/10 wt％）三元共混物的机械性能高度依赖于BCP结构的选择，并且与它们的形态密切相关。通过添加ABA-或A 2 BA 2，与无BCP的共混物（PHBH / PCL = 75/25）相比，断裂伸长率显着提高了5-10倍。型BCP作为增容剂。
更新日期：2019-03-20
中文翻译：
通过与最终功能化微生物聚羟基脂肪酸酯的点击反应，可生物降解的相容剂，用于聚（羟基链烷酸酯）/聚（ε-己内酯）共混物
聚（羟基链烷酸酯）（PHA）已引起广泛关注，因为它们即使在环境条件下也易于生物降解。然而，由于它们的脆性，阻碍了将这些聚合物的应用扩展到许多领域。目前，与柔软的可生物降解的聚合物（例如聚（ε-己内酯）（PCL））共混是在不牺牲生物降解性的情况下提高PHA材料韧性的最佳解决方案。因此，强烈期望开发可生物降解的增容剂。本文介绍了一种系统的调查成许多微生物来源的聚（3-羟基丁酸酯组成的体系结构上改变嵌段共聚物（口岸）的相容能力共-3-羟基己酸酯）（P（3HB-共-3HHx）; PHBH（作为A嵌段）和PCL（作为B嵌段），包括AB-，A 2 B-，AB 2-，ABA-和A 2 BA 2型BCP。这些BCP是通过叠氮基官能化PCL与微生物产生的炔丙基末端官能化PHBH的点击反应精确合成的。透射电子显微镜和拉伸试验实验表明，PHBH / PCL / BCP（= 67/23/10 wt％）三元共混物的机械性能高度依赖于BCP结构的选择，并且与它们的形态密切相关。通过添加ABA-或A 2 BA 2，与无BCP的共混物（PHBH / PCL = 75/25）相比，断裂伸长率显着提高了5-10倍。型BCP作为增容剂。
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