Enhancing mechanical and thermal properties of blends with novel phenylethynyl-terminated siloxane-containing ortho-hydroxy polyimide

IF 1.8 4区化学 Q3 POLYMER SCIENCE

High Performance Polymers Pub Date : 2024-08-19 DOI:10.1177/09540083241274320

Guohao Zhu, Jilei Xu, Huimin Sun, Ping Chen

引用次数: 0

Abstract

A novel phenylethynyl-terminated siloxane-containing ortho-hydroxy polyimide (O-SPI) was synthesized and physically blended with thermoplastic polyimide (PI) to enhance both the thermal and mechanical properties of polyimide, addressing the growing demand for high-performance materials in harsh environments. The blend underwent conversion to semi-Interpenetrating Polymer Networks ( semi-IPNs) and benzoxazole structures through thermal curing of reactive phenylethynyl groups and thermal rearrangement of ortho-hydroxy imide units. The trends in thermal and mechanical properties were investigated in relation to the chemical structures and varying mass fraction of O-SPI. The covalent incorporation of semi-IPNs and rigid benzoxazole structures restrict segmental motion while the backbone linkage confers the toughness of the blends. These synergistic effects insure the cured blends with high glass transition temperatures (472.51°C) and tensile strength (117.81 MPa) simultaneously, demonstrating their potential for applications in challenging conditions.

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提高新型苯乙炔基端含硅氧烷的原羟基聚酰亚胺混合物的机械性能和热性能

为了提高聚酰亚胺的热性能和机械性能，我们合成了一种新型含苯乙炔基端硅氧烷的原羟基聚酰亚胺（O-SPI），并将其与热塑性聚酰亚胺（PI）进行物理共混，以满足恶劣环境下对高性能材料日益增长的需求。通过活性苯乙炔基团的热固化和正羟基亚胺单元的热重排，混合物被转化为半互穿聚合物网络（semi-IPNs）和苯并恶唑结构。研究了与化学结构和不同质量分数的 O-SPI 有关的热性能和机械性能趋势。半 IPN 和刚性苯并恶唑结构的共价结合限制了段运动，而骨架连接则赋予了混合物韧性。这些协同效应使固化后的混合物同时具有较高的玻璃化转变温度（472.51°C）和拉伸强度（117.81 兆帕），证明了它们在挑战性条件下的应用潜力。

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来源期刊

High Performance Polymers 化学-高分子科学

CiteScore

4.20

自引率

14.30%

发文量

106

审稿时长

1.2 months

期刊介绍： Health Services Management Research (HSMR) is an authoritative international peer-reviewed journal which publishes theoretically and empirically rigorous research on questions of enduring interest to health-care organizations and systems throughout the world. Examining the real issues confronting health services management, it provides an independent view and cutting edge evidence-based research to guide policy-making and management decision-making. HSMR aims to be a forum serving an international community of academics and researchers on the one hand and healthcare managers, executives, policymakers and clinicians and all health professionals on the other. HSMR wants to make a substantial contribution to both research and managerial practice, with particular emphasis placed on publishing studies which offer actionable findings and on promoting knowledge mobilisation toward theoretical advances. All papers are expected to be of interest and relevance to an international audience. HSMR aims at enhance communication between academics and practitioners concerned with developing, implementing, and analysing health management issues, reforms and innovations primarily in European health systems and in all countries with developed health systems. Papers can report research undertaken in a single country, but they need to locate and explain their findings in an international context, and in international literature.