Influence of poly(vinyl alcohol) on poly(glycolic acid) crystallization: An investigation into intermolecular interactions

IF 3.1 2区化学 Q2 CHEMISTRY, ANALYTICAL

Thermochimica Acta Pub Date : 2024-07-19 DOI:10.1016/j.tca.2024.179826

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Abstract

The crystallization behavior and miscibility of blends between poly(glycolic acid) (PGA) and minority poly(vinyl alcohol) (PVA) with different saponification degrees have been studied. It was found that the melting point and crystallization ability of PGA in blends were remarkably depressed. During isothermal crystallization, introduction of PVA led to a decrease in both the Avrami index and the crystallization rate of PGA. The observation of spherulite morphology further revealed that the addition of PVA inhibited the growth of PGA spherulites, but increased the density of nucleation. Besides, PVA1788 with lower saponification degree displayed a stronger impact than PVA1799 on the crystallization of PGA. All blends exhibited a single composition-dependent glass transition temperature (T_g), characteristic of miscible systems. The T_gs fitted the Kwei equation well, and the calculated interaction parameters demonstrated the formation of intermolecular interactions between PGA and PVA and revealed the stronger interactions presenting in PGA/PVA1788 blends. FTIR investigation directly confirmed the effect of PVA on the carbonyl groups of PGA and PVA1788 played more roles than PVA1799. The interactions mainly form between carbonyl groups in PGA and hydroxyl groups in PVA1799, while latter ones change to carbonyl and hydroxyl groups in PVA1788.

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聚乙烯醇对聚乙醇酸结晶的影响：分子间相互作用研究

研究了不同皂化度的聚羟基乙酸（PGA）和少数聚乙烯醇（PVA）共混物的结晶行为和相溶性。研究发现，混合物中 PGA 的熔点和结晶能力明显降低。在等温结晶过程中，引入 PVA 会导致 PGA 的阿夫拉米指数和结晶速率下降。对球晶形态的观察进一步表明，PVA 的加入抑制了 PGA 球晶的生长，但增加了成核密度。此外，皂化度较低的 PVA1788 比 PVA1799 对 PGA 结晶的影响更大。所有共混物都表现出单一成分依赖性玻璃化转变温度（Tg），这是混溶体系的特征。Tg 与 Kwei 方程十分吻合，计算得出的相互作用参数表明 PGA 和 PVA 之间形成了分子间相互作用，并揭示了 PGA/PVA1788 共混物中更强的相互作用。傅立叶变换红外光谱研究直接证实了 PVA 对 PGA 羧基的影响，PVA1788 比 PVA1799 起到了更大的作用。相互作用主要在 PGA 的羰基和 PVA1799 的羟基之间形成，而 PVA1799 的羟基则转变为 PVA1788 的羰基和羟基。

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来源期刊

Thermochimica Acta 化学-分析化学

CiteScore

6.50

自引率

8.60%

发文量

210

审稿时长

40 days

期刊介绍： Thermochimica Acta publishes original research contributions covering all aspects of thermoanalytical and calorimetric methods and their application to experimental chemistry, physics, biology and engineering. The journal aims to span the whole range from fundamental research to practical application. The journal focuses on the research that advances physical and analytical science of thermal phenomena. Therefore, the manuscripts are expected to provide important insights into the thermal phenomena studied or to propose significant improvements of analytical or computational techniques employed in thermal studies. Manuscripts that report the results of routine thermal measurements are not suitable for publication in Thermochimica Acta. The journal particularly welcomes papers from newly emerging areas as well as from the traditional strength areas: - New and improved instrumentation and methods - Thermal properties and behavior of materials - Kinetics of thermally stimulated processes

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