阻燃HIPS增韧、增强改性

采用PPO、超细SEBS及短切芳纶纤维对高抗冲聚苯乙烯(HIPS)进行了增韧、增强改性,当PPO含量为10%-20%时,材料的力学性能变化明显,当添加量为20%时,材料的力学性能最优,同时,PPO有利于材料的阻燃,在材料表面加速脱水炭化,形成隔绝空气的凝聚相,从而抑制燃烧的蔓延;超细SEBS满足HIPS增韧的最佳尺寸,含量为15%时,力学性能最优;随着短切芳纶纤维的添加,材料的缺口冲击强度先降低后增加,而拉伸强度不断增加,当含量为10%时,材料的综合力学性能最优。动态热力学分析结果表明,改性复合材料的低温力学性能明显优于纯HIPS。

Toughened and Strengthened Modification of Flame Retardant HIPS

The toughened and strengthened modification of HIPS was used by PPO, superfine SEBS, and chopped aramid fiber. The results showed that, the properties of material was changed suddenly when PPO was 10%~ 20%, it accelerated the dehydration and carbonization of the surface and formed a condensed phase of air separation, then, inhibited the spread of combustion, and the mechanical properties were optimal when the content was 20%. Superfine SEBS was the optimum toughening size of HIPS, and the mechanical properties were optimal when the content was 15%. With the addition of chopped aramid fiber, the notched impact strength firstly decreased and then increased, and also the tensile strength increased continuously, when the content of chopped aramid fiber was 10%, the comprehensive mechanical properties were optimal. It was showed that, with DMTA , the low temperature performances of the two composts were better than pure HIPS, and SEBS could increase the internal friction, so the impact strength of the material was increased.