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动态硫化乙华平橡胶/热塑性聚氨酯弹性体共混物

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  • Key Words:乙华平橡胶;;热塑性聚氨酯弹性体;;动态硫化;;返炼;;力学性能;;相态结构

  • Abstract:对乙酸乙烯酯质量分数分别为40%和70%的乙烯-乙酸乙烯酯共聚物EVM400和EVM700先进行动态硫化制成母炼胶,然后与热塑性聚氨酯弹性体(TPU)进行共混,以过氧化二异丙苯(DCP)作为硫化剂。考察了动态硫化工艺和DCP用量以及返炼对共混物力学性能的影响,并通过相差显微镜对共混物的结构进行了分析。结果表明,EVM400在动态硫化时,黏度变化对DCP用量改变的敏感性要明显高于EVM700;随着DCP用量的增大,共混物TPU/EVM700的力学性能提高,而对TPU/EVM400共混物的力学性能没有明显改善;EVM动态硫化后,在TPU/EVM700共混物中,其相畴较TPU/EVM400共混物的更小,更均匀;返炼使TPU/EVM700共混体系的力学性能下降,但使TPU/EVM400共混体系的力学性能有所提高。

  • Issue:02

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