SBS/无机刚性粒子对苯乙烯-丁二烯嵌段共聚物的增韧改性

Toughening modification for SBC copolymer with SBS/rigid inorganic fillers

将苯乙烯-丁二烯-苯乙烯共聚物(SBS)与不同的刚性无机粒子(如CaCO_3、滑石粉、硫酸钡)复配,对苯乙烯-丁二烯嵌段共聚物(SBC)进行增韧,研究了SBS与无机刚性粒子含量对SBC缺口冲击强度的影响。结果表明:先使用SBS形成弹性界面相,然后使用CaCO_3作为无机刚性粒子对其进行增韧,该体系大幅提高了SBC的缺口冲击强度,其缺口冲击强度可达到30.0 kJ/m^2以上,为其原始性能的十几倍;w(CaCO_3)为5%是脆韧转化点,w(SBS)为5%以上时才能形成弹性界面,实现增韧。

Styrene-butadiene-styrene copolymer(SBS)was blended with various rigid inorganic fillerssuch as calcium carbonate(CaCO3),talc and barium sulfate,which was used for toughening styrene-butadieneblock copolymer(SBC).The effects of the mass fraction of SBS and rigid inorganic fillers on the notched impactstrength of SBC were investigated.The results show that SBS forms elastic interface on SBC,then it is toughenedby CaCO3.This system improves the notched impact strength of SBC by ten times to30.0kJ/m2.The brittleductiletransition occurs and elastic interface is formed for toughening when the mass fraction of CaCO3and SBSexceed5%respectively.