Atactic, Isotactic, and Syndiotactic Methylated Polyhydroxybutyrates: An Unexpected Series of Isomorphic Polymers,Journal of the American Chemical Society

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Atactic, Isotactic, and Syndiotactic Methylated Polyhydroxybutyrates: An Unexpected Series of Isomorphic Polymers
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2023-11-17 , DOI: 10.1021/jacs.3c10944
Zhiyao Zhou ₁ , Anne M LaPointe ₁ , Geoffrey W Coates ₁

Affiliation

Polyhydroxyalkanoates (PHAs), such as poly[(R)-3-hydroxybutyrates] [(R)-P3HB], are produced by bacteria and are promising alternatives to nondegradable polyolefin plastics, but their semicrystallinity and high melting points are only maintained at high tacticity, which are commonly seen in other semicrystalline polymers like isotactic polypropylene (iPP). We herein report a class of synthetic PHAs, cis-poly(3-hydroxy-2-methylbutyrate)s (cis-PHMBs), that exhibit tacticity-independent semicrystallinity. The syndiotactic, isotactic, and even atactic PHMBs all share high melting points (T_m > 170 °C) and nearly identical crystal structures. The isomorphism of these polymers across three different tacticities has allowed access to iPP-like, high-performance PHMB without the requirement of high tacticity.

中文翻译：

无规立构、全同立构和间规立构甲基化聚羟基丁酸酯：一系列意想不到的同构聚合物

聚羟基烷酸酯（PHA），例如聚[( R )-3-羟基丁酸酯][( R )-P3HB]，由细菌产生，是不可降解聚烯烃塑料的有希望的替代品，但它们的半结晶性和高熔点只能在高温下保持。立构规整度，常见于等规聚丙烯 ( i PP) 等其他半结晶聚合物中。我们在此报告了一类合成PHA，顺式聚(3-羟基-2-甲基丁酸酯)(顺式PHMB)，其表现出立构规整度无关的半结晶性。间规、等规甚至无规 PHMB 都具有高熔点（ T _m > 170 °C）和几乎相同的晶体结构。这些聚合物在三种不同立构规整度上的同构性使得无需高立构规整度即可获得类似i PP 的高性能 PHMB。

更新日期：2023-11-17

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