就国外近期研究内容,介绍了熔融共混过程初期的形态结构发展模式.在聚合物共混初期,分散相首先形成片状物(带状物),进而在剪切力场作用下碎裂成球形粒子,完全熔融以后,粒径变化很小;此模式对反应性体系和非反应性体系均适合.对于弹性体含量低的橡塑共混体系,在共混初期弹性粒子首先成为连续相,可用一"四阶段"相反转模式描述;对于反应性体系,此模式不会改变,但是相反转延迟发生,并伴有转矩增大现象.
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