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STUDY ON MODIFICATION OF LOW VISCOSITY PBT WITH BLOCKED ISOCYANATE
Author(s): 
Pages: 13-16
Year: Issue:  5
Journal: ENGINEERING PLASTICS APPLICATION

Keyword:  聚对苯二甲酸丁二酯封端异氰酸酯改性扩链剂;
Abstract: 以封端异氰酸酯(BMDI)作低粘度聚对苯二甲酸丁二酯(PBT)的改性剂,考察改性前后PBT的特性粘度、端基含量、力学性能的变化.结果表明,改性后PBT的特性粘度从0.82 dL/g提高到1.3 dL/g以上;端羟基含量从84.2 mmol/kg降至35.1 mmol/kg;端羧基含量从31.3 mmol/kg降至21 mmol/kg;BMDI用量在理论用量之内时,PBT的力学性能得到明显提高,超过理论用量,由于产生凝胶其力学性能降低;随着BMDI用量的增加,玻纤增强低粘度PBT的力学性能也得到提高,基本达到玻纤增强正品PBT的性能指标.
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