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波聚合制备聚(天然橡胶-接枝-丙烯酰胺)吸水膨胀橡胶

DOI: 10.3724/SP.J.1105.2014.13455, PP. 423-426

Keywords: 波聚合,天然橡胶,吸水膨胀橡胶,接枝

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Abstract:

采用波聚合工艺快速制备了聚(天然橡胶-接枝-丙烯酰胺)吸水膨胀橡胶.该波聚合过程能够在45℃左右被引发,最高波温达到112℃,波速0.3~1.0cm·min-1.与传统间歇聚合工艺相比,波聚合制备样品的接枝效率达到51.8%,是传统间歇聚合制品的2.8倍;最大吸水倍率为7.66g·g-1,是传统聚合制品的1.6倍;聚合时间为传统间歇聚合的1/8.扫描电镜观测发现,波聚合制备的吸水膨胀橡胶呈现均匀分布的蜂窝状微孔结构,孔直径在4~10μm之间,该结构有利于橡胶在保持高强度和弹性的同时,提高吸水性能;而传统间歇聚合制品内则以小于2μm的微孔为主,同时有少数近毫米级的条形大孔存在.

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