摘要
Abstract
To enhance the low-temperature impact resistance of chlorinated polyvinyl chloride(CPVC),powdered styrene-butadiene rubber(PSBR)and dioctyl adipate(DOA)were employed as a toughening agent and plasticizer,respectively.PSBR/CPVC and PSBR/DOA/CPVC compounds were prepared by melt blending.The effects of PSBR content on im-pact strength at various temperatures,tensile properties,flame retardancy,Vicat softening temperature,thermal stabili-ty,and fracture morphology were systematically investigated for both CPVC and DOA/CPVC systems.Results showed that incorporating 1 or 3 phr of PSBR into CPVC increased the notched impact strength by 30.4%and 41.0%at 15℃,and by 54.5%at both-15℃and-30℃,respectively.An appropriate PSBR loading also improved the Vicat soften-ing temperature,elongation at break,and thermal stability.However,excessive PSBR led to poor dispersion and agglom-eration,causing a significant decline in overall mechanical performance.The addition of 10 phr DOA promoted finer dis-persion of PSBR particles within the CPVC matrix,albeit with reductions in tensile strength,limiting oxygen index,and Vicat softening temperature.Owing to the synergistic toughening effect of DOA and PSBR,the PSBR/DOA/CPVC(5/10/95)formulation exhibits the best balanced properties.Compared with neat CPVC,this compound achieved impact strength increases of 437.8%,98.7%,and 175.0%at 15℃,-15℃,and-30℃,respectively,while retaining rela-tively high tensile strength(36.5 MPa),elongation at break(22.9%),and limiting oxygen index(33.0%).关键词
氯化聚氯乙烯/粉末丁苯橡胶/己二酸二辛酯/低温冲击性能/协同增韧效应Key words
chlorinated polyvinylchloride/powdered styrene-butadiene rubber/dioctyl adipate/low-temperature impact property/synergistic toughening effect分类
化学化工
