Thermal cross-linking mechanism of polyhydroxyalkanoates with vinyl unit in their side chains

IF 4.5 2区化学 Q2 POLYMER SCIENCE

Polymer Pub Date : 2025-09-29 DOI:10.1016/j.polymer.2025.129164

Sumire Ogura , Jobu Tateiwa , Taizo Kabe , Yuki Miyahara , Takeharu Tsuge , Tadahisa Iwata

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Abstract

Poly[(R)-3-hydroxybutyrate-co-(R)-3-hydroxy-4-pentenoate] (P(3HB-co-3H4PE)), a microbial polyester containing an unsaturated group (vinyl group) in the side chain, was employed to prepare cross-linked materials. Upon testing UV-induced and heat-induced cross-linking, it was found that P(3HB-co-3H4PE) undergoes thermal cross-linking without cross-linking agent in crystal region. The thermal cross-linking occurs within a specific temperature range below the melting point and only when crystals are present in the material. As a result of the cross-linking effect, the strength of the material was improved. Since no cross-linking occurs at temperatures above the melting point, like other polyhydroxyalkanoate copolymers, it is possible to process it by molding, and post-cross-linking can further enhance the material's strength. The cross-linking of this PHA with an unsaturated group will likely open up the possibility for even stronger or higher heat resistance PHA materials.

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侧链含乙烯基的聚羟基烷酸酯的热交联机理

聚[(R)-3-羟基丁酸酯-co-(R)-3-羟基-4-戊酸酯]（P(3HB-co-3H4PE)）是一种侧链上含有不饱和基（乙烯基）的微生物聚酯，用于制备交联材料。通过紫外诱导交联和热诱导交联测试，发现P（3HB-co-3H4PE）在晶体区域无交联剂的情况下发生了热交联。在低于熔点的特定温度范围内，只有当材料中存在晶体时，才会发生热交联。由于交联效应，材料的强度得到了提高。由于在熔点以上的温度下不会像其他聚羟基烷酸酯共聚物那样发生交联，因此可以通过成型处理，并且交联后可以进一步提高材料的强度。这种PHA与不饱和基团的交联可能会为更强或更高耐热性的PHA材料开辟可能性。

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来源期刊

Polymer 化学-高分子科学

CiteScore

7.90

自引率

8.70%

发文量

959

审稿时长

32 days

期刊介绍： Polymer is an interdisciplinary journal dedicated to publishing innovative and significant advances in Polymer Physics, Chemistry and Technology. We welcome submissions on polymer hybrids, nanocomposites, characterisation and self-assembly. Polymer also publishes work on the technological application of polymers in energy and optoelectronics. The main scope is covered but not limited to the following core areas: Polymer Materials Nanocomposites and hybrid nanomaterials Polymer blends, films, fibres, networks and porous materials Physical Characterization Characterisation, modelling and simulation* of molecular and materials properties in bulk, solution, and thin films Polymer Engineering Advanced multiscale processing methods Polymer Synthesis, Modification and Self-assembly Including designer polymer architectures, mechanisms and kinetics, and supramolecular polymerization Technological Applications Polymers for energy generation and storage Polymer membranes for separation technology Polymers for opto- and microelectronics.