Microstructure and mechanical properties of ternary phase polypropylene/elastomer/magnesium hydroxide fire-retardant compositions
Microstructure and mechanical properties of ternary phase polypropylene/elastomer/magnesium hydroxide fire-retardant compositions
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DOI：
10.1002/(sici)1097-4628(19960531)60:9
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发表时间：
1996-05
影响因子：
3
通讯作者：
Jo-Yu Wang;J. F. Tung;M. Y. A. Fuad;P. Hornsby
中科院分区：
文献类型：
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作者：
Jo-Yu Wang;J. F. Tung;M. Y. A. Fuad;P. Hornsby
通过将这种聚合物与未涂覆和表面处理形式的氢氧化镁填料和各种弹性体改性剂组合，在有和没有马来酸酐官能化的情况下，制备阻燃聚丙烯（PP）复合材料。二元和三元相组合物的机械性能显着不同，并讨论了它们的微观结构（主要由SEM和FTIR确定）和组分的相对相互作用。冲击强度，特别是，强烈影响填料表面处理的存在下，橡胶相分散的程度。红外光谱表明，官能化的乙丙橡胶（F-EPR）与未涂覆的氢氧化镁的表面反应，导致广泛的橡胶封装和韧性的改善相对于未改性的EPR，这是存在于基体中的相分散液滴。然而，通过将F-EPR与经硬脂酸镁表面处理的填料共混，包覆被抑制，并且橡胶优先分散在PP基体中。该配方导致填料-基体相互作用的改善和基体增韧的增强，从而导致冲击强度的进一步增加。还报道了材料组成对熔体流动行为和UL 94可燃性等级的影响。John Wiley & Sons，Inc.
Fire-retardant polypropylene (PP) composites were prepared by combining this polymer with uncoated and surface treated forms of magnesium hydroxide filler and various elastomeric modifiers, with and without maleic anhydride functionalization. Mechanical properties of binary and ternary phase compositions differed significantly and are discussed in terms of their microstructures (determined principally by SEM and FTIR) and the relative interaction of the components. Impact strength, in particular, was strongly influenced by the presence of filler surface treatment and the degree of rubbery phase dispersion. FTIR showed that functionalized ethylene–propylene rubber (F-EPR) reacted with the surface of uncoated magnesium hydroxide leading to extensive rubber encapsulation and an improvement in toughness relative to unmodified EPR, which was present in the matrix only as phase dispersed droplets. However, by blending F-EPR with filler surface treated with magnesium stearate, encapsulation was inhibited and the rubber was preferentially dispersed in the PP matrix. This formulation resulted in both improved filler–matrix interaction and enhanced matrix toughening leading to a further increase in impact strength. The effects of material composition on melt flow behavior and UL94 flammability rating, are also reported. © 1996 John Wiley & Sons, Inc.