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动态硫化制备丙烯酸酯橡胶/聚乳酸共混物的结构与性能

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  • Key Words:丙烯酸酯橡胶;聚乳酸;共混物;动态硫化;微观相态;力学性能;动态力学性能;热性能

  • Abstract:通过动态硫化法制备了丙烯酸酯橡胶(ACM)/聚乳酸(PLA)共混物,考察了共混配比及硫化剂用量对共混物动态硫化性能,硫化胶力学性能、动态力学性能、热性能以及相态结构的影响。结果表明,当共混原料中PLA的比例增加时,共混物的动态硫化速率减慢,硫化胶的拉伸强度升高、扯断伸长率降低; ACM与PLA的质量比为80/20时共混物的相容性最好,70/30时有效阻尼温域达到最大。PLA以"岛相"分散到ACM"海相"中,当PLA用量增加到50份(质量)时,共混体系呈现出共连续结构,发生相态转变。硫化剂用量的减少使得ACM的交联程度降低,共混物的力学性能下降、阻尼因子峰值升高,相容性及有效阻尼温域无明显变化。硫化剂用量减半后,共混体系的表面变得较为平滑,未留下明显空洞,且PLA相的冷结晶和熔融现象完全消失。

  • Volume:v.42

  • Issue:01

  • Translation or Not:no

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