Effect of Li Halides on the Mechanical Properties and Thermoplasticity of Poly(vinyl alcohol) Molded by Hot Pressing

IF 2.5 4区化学 Q3 POLYMER SCIENCE

Macromolecular Chemistry and Physics Pub Date : 2025-02-09 DOI:10.1002/macp.202400382

Yusuke Taoka, Koyuru Suzuki, Masayuki Yamaguchi, Kazuaki Matsumura

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Abstract

The effect of lithium halide salts on the characteristics of poly(vinyl alcohol) (PVA) gels fabricated using the hot-press (HP) technique is investigated. The incorporation of lithium salts, such as lithium chloride (LiCl), lithium bromide (LiBr), and lithium iodide (LiI), degrades the mechanical properties of the PVA gel and decreases its crystallinity, melting point, and glass transition temperature (T_g). Additionally, the melting point of PVA is lowered, resulting in the melting of PVA below its decomposition temperature, leading to thermoplasticity. Following thermoforming, the mechanical properties of the PVA gel are minimally altered compared with those before thermoforming, potentially enhancing the processability of PVA and diversifying the range of achievable shapes. Notably, the majority of the introduced lithium salts can be eliminated by washing. Notably, the most pronounced change in the PVA gel properties is obtained with LiCl addition than with LiBr or LiI addition, suggesting that LiCl imparts superior processing characteristics to PVA gels.

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Li卤化物对聚乙烯醇热压成型材料力学性能和热塑性的影响

研究了卤化锂对热压法制备聚乙烯醇（PVA）凝胶性能的影响。锂盐（如氯化锂（LiCl）、溴化锂（LiBr）和碘化锂（LiI））的掺入会降低PVA凝胶的机械性能，降低其结晶度、熔点和玻璃化转变温度（Tg）。另外，PVA的熔点降低，导致PVA的熔点低于其分解温度，从而产生热塑性。热成型后，与热成型前相比，PVA凝胶的机械性能变化最小，潜在地提高了PVA的可加工性，并使可实现的形状范围多样化。值得注意的是，大多数引入的锂盐可以通过洗涤来消除。值得注意的是，与添加LiBr或LiI相比，添加LiCl对PVA凝胶性能的影响最为显著，这表明LiCl赋予了PVA凝胶优越的加工特性。

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

Macromolecular Chemistry and Physics 化学-高分子科学

CiteScore

4.30

自引率

4.00%

发文量

278

审稿时长

1.4 months

期刊介绍： Macromolecular Chemistry and Physics publishes in all areas of polymer science - from chemistry, physical chemistry, and physics of polymers to polymers in materials science. Beside an attractive mixture of high-quality Full Papers, Trends, and Highlights, the journal offers a unique article type dedicated to young scientists – Talent.