摘要
以苯乙烯和丁二烯为聚合单体,采用多次加料多次引发的聚合工艺合成出一种星型嵌段丁苯树脂。在体系中水含量相同的条件下,终止剂用量增加,丁苯树脂的雾度增加,兼顾试样颜色和雾度,终止剂与正丁基锂的摩尔比为(0.6～0.7)∶1.0较好;丁苯树脂中二段聚苯乙烯的数均分子量(Mn)增加,丁苯树脂透光率增加,Mn为0.95×104时,透光率大于90.0%;二段聚苯乙烯的Mn低于0.75×104或高于1.30×104时,丁苯树脂的断裂伸长率很低,Mn为0.95×104左右时,断裂伸长率大于300%,表现出优异的韧性;偶联剂用量降低,丁苯树脂的断裂伸长率呈上升趋势。
A kind of star-type block butadiene--styrene resin was synthesized from butadiene and styrene monomer with a polymerization process featuring the mode of multiple feeding and multiple initiations. The haze of the resin increased as the termination agent dosage augmented when the polymerization system kept the same water content. The appropriate molar ratio of the termination agent to n-butyl lithium should be in the range of （0.6-0.7） ： 1.0 in case of taking the color and haze of the resin specimen into account simultaneously. The light transmittance of the resin increased with the rise in the number average molecular mass（Mn） of polystyrene chain formed in the secondary feeding of the styrene monomer. The light transmittance was over 90.0% when the Mn was 0.95×10^4. The elongation at break of the resin was rather low if the M, was either less than 0.75×10^4 or higher than 1.30×10^4. The elongation at break exceeded 300% when the Mn reached about 0.95×10^4, which endowed the resin with excellent toughness. The elongation at break of the resin assumed an ascending tendency as the coupling agent dosage reduced.
出处
《合成树脂及塑料》
CAS
北大核心
2012年第2期1-4,共4页
China Synthetic Resin and Plastics
关键词
丁苯树脂
嵌段
透光率
雾度
断裂伸长率
butadiene-styrene resin
block
light transmittance
haze
elongation at break
