核壳粒子特性对其增韧PBT/PC共混物性能的影响

Effect of Core-Shell Particles Properties on Toughening of Poly( Butylene Terephthalate) /Polycarbonate Blend

调节叔十二烷基硫醇(TDDM)用量合成了以聚丁二烯(PB)为核,苯乙烯-丙烯腈-甲基丙烯酸环氧丙酯共聚物为壳的核壳粒子ABS-g-GMA。接枝特性测试发现TDDM降低了核壳粒子的接枝率和接枝效率。动态力学热分析结果表明TDDM降低了PB相交联程度,提高了PB空洞化能力。随着TDDM用量增加,ABS-g-GMA屈服应变降低,断裂伸长率提高。透射电镜发现TDDM加入对ABS-g-GMA在聚对苯二甲酸丁二醇酯(PBT)与聚碳酸酯(PC)共混物基体中的分散形态没有不利影响。力学测试表明ABS-g-GMA粒子对PBT/PC共混物具有良好的增韧作用。TDDM对ABS-g-GMA增韧PBT/PC有积极作用,能使共混物冲击韧性和断裂强度得到提高。

The content of dodecyl mercaptan( TDDM) was adjusted to prepare the polybutadiene-g-( styrene-acrylonitrile-glycidyl methacrylate)( ABS-g-GMA) core-shell particles with polybutadiene( PB) as core and styrene-acrylonitrile-glycidyl methacrylate copolymer as shell. The grafting test demonstrates that the grafting degree and grafting efficiency of core-shell particles decrease with the addition of TDDM. DMA results show that TDDM decreases the crosslinking degree of PB phase and improves its cavitation ability. The yielding stain decreases and elongation at break increases for ABS-g-GMA with increase of the TDDM content. TEM results show that TDDM has no adverse influence for the dispersion of ABS-g-GMA particles in poly( butylene terephthalate)( PBT) and polycarbonate( PC) blends. Mechanical tests indicate that ABS-g-GMA particles show excellent toughening effect on PBT /PC blends. TDDM has positive influence on the toughening of PBT /PC blends for ABS-g-GMA particles and TDDM makes the impact toughness and break strength of the blend improve.