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采用同步法合成了聚氨酯(PU)/聚甲基丙烯酸甲酯(PMMA)的线型共混物、嵌段共聚物和互穿高聚物(IPN)。凭藉力学性能测试、电镜观察和动态力学谱分析,研究了光固化、热固化、化学组成、物理结构等因素对体系力学性能、结构形态和粘弹行为的影响。结果表明:PU/PMMA是呈两相结构的部分相容体系,其中线型共混物伸长率最大,IPN强度最高,而嵌段共聚物的力学性能较差。此外,嵌段共聚物和IPN光固化体系形成的相畴结构均一,其抗张强度和伸长率明显高于热固化体系。聚合物的力学性能除了受化学结构影响以外,还与化学组成有关,随体系中PMMA含量和PU中硬链段含量增加,聚合物抗张强度升高,伸长率下降。
A linear blend of polyurethane (PU) / polymethylmethacrylate (PMMA), block copolymer and interpenetrating polymer (IPN) were synthesized by the simultaneous method. The mechanical properties, structural morphology and viscoelastic behavior of the system were studied by means of mechanical properties test, electron microscope observation and dynamic mechanical spectrum analysis, including light curing, thermal curing, chemical composition and physical structure. The results show that PU / PMMA is partially compatible with two-phase structure. The linear blend has the highest elongation and the highest IPN, while the block copolymer has poor mechanical properties. In addition, the block copolymer and the IPN photocuring system form homogeneous domains with significantly higher tensile strength and elongation than the thermosetting system. In addition to the mechanical properties of the polymer by the chemical structure, but also with the chemical composition, with the system of PMMA content and PU hard segment content increases, the polymer tensile strength, elongation decreased.