Crystallization and melting of Poly(4-hydroxybutyrate) characterized by fast scanning calorimetry

IF 5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing Pub Date : 2024-09-24 DOI:10.1016/j.polymertesting.2024.108597

Xiangyan Yang , Runyu Zhou , Zixiao Xu , Jing Deng , Chuyue Wei , Jiahui Luo , Haoqi Luo , Lijia Zou , Yang Wu , Xin Ao , Shuaishuai Yuan , Weihua Zhou

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Abstract

Poly (4-hydroxybutyrate) (P4HB) is a marine biodegradable polyester with promising applications. Unfortunately, the crystallization and melting behavior of P4HB has not been systematically studied, due to the rapid crystallization near room temperature. In particular, the characterization of crystallization and melting of P4HB by fast scanning calorimetry (FSC) has not been reported previously. In this article, the common differential scanning calorimeter (DSC), polarized optical microscopy (POM), atomic force microscopy (AFM) and FSC were performed to investigate the crystallization and melting behavior of P4HB. The results indicated that melt crystallization facilitated the formation of fragmented crystals rather than complete spherulites. Furthermore, the P4HB exhibited a broad crystallization temperature range from −19 °C to 49 °C, and the crystallization and melting of P4HB was notably affected by the temperature, in addition to the heating or cooling rates. The higher crystallization temperature and lower cooling rates facilitated the formation of well-developed crystals. Remarkably, the P4HB is found to be unable to crystallize at heating or cooling rates exceeding 6 K/s. Moreover, double melting peaks could be discerned at moderate isothermal crystallization temperature exhibiting faster crystallization rate. The findings will provide theoretical guidance on how to optimize the processing parameters in modulating the crystallization of P4HB.

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用快速扫描量热法表征聚（4-羟基丁酸）的结晶和熔化过程

聚（4-羟基丁酸）（P4HB）是一种海洋生物可降解聚酯，具有广阔的应用前景。遗憾的是，由于 P4HB 在室温附近快速结晶，其结晶和熔化行为尚未得到系统研究。特别是用快速扫描量热法（FSC）表征 P4HB 的结晶和熔化，此前还未见报道。本文采用常见的差示扫描量热仪（DSC）、偏振光学显微镜（POM）、原子力显微镜（AFM）和快速扫描量热仪（FSC）来研究 P4HB 的结晶和熔化行为。结果表明，熔融结晶促进了碎片晶体的形成，而非完整球状晶体的形成。此外，P4HB 的结晶温度范围很广，从 -19 °C 到 49 °C，而且 P4HB 的结晶和熔化除了受加热或冷却速率的影响外，还受到温度的显著影响。较高的结晶温度和较低的冷却速率有利于形成发育良好的晶体。值得注意的是，在加热或冷却速率超过 6 K/s 时，P4HB 无法结晶。此外，在中等等温结晶温度下可发现双熔峰，表明结晶速度更快。这些发现将为如何优化加工参数以调节 P4HB 的结晶提供理论指导。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Polymer Testing 工程技术-材料科学：表征与测试

CiteScore

10.70

自引率

5.90%

发文量

328

审稿时长

44 days

期刊介绍： Polymer Testing focuses on the testing, analysis and characterization of polymer materials, including both synthetic and natural or biobased polymers. Novel testing methods and the testing of novel polymeric materials in bulk, solution and dispersion is covered. In addition, we welcome the submission of the testing of polymeric materials for a wide range of applications and industrial products as well as nanoscale characterization. The scope includes but is not limited to the following main topics: Novel testing methods and Chemical analysis • mechanical, thermal, electrical, chemical, imaging, spectroscopy, scattering and rheology Physical properties and behaviour of novel polymer systems • nanoscale properties, morphology, transport properties Degradation and recycling of polymeric materials when combined with novel testing or characterization methods • degradation, biodegradation, ageing and fire retardancy Modelling and Simulation work will be only considered when it is linked to new or previously published experimental results.