【摘要】 在考察了聚氨酯弹性体/纳米二氧化硅/聚氯乙烯(PU/nano-SiO2/PVC)反应挤出工艺的基础上,采用反应挤出一步法制备了PU弹性体/nano-SiO2改性的PVC材料,并对其力学性能进行了实验研究。结果表明,PU/nano-SiO2的质量比为5∶1时,增韧改性效果最佳,PU弹性体和nano-SiO2能协同增韧PVC,且nano-SiO2具有补强作用,当PU/nano-SiO2/PVC质量比为5∶1∶20时,改性材料的综合性能最优,此时样品材料的冲击强度达到45.6kJ/m2,拉伸强度为50.3MPa。更多还原

【Abstract】 Polyvinyl chloride(PVC) material modified by polyurethane(PU) elastomer/nanometer silicon dioxide (nano-SiO2) was prepared by one-step reactive extrusion technology(OSRET),on the basis of studying on technological procedure of OSRET PU/nano-SiO2/PVC blending.The properties of PVC modified by PU/nano-SiO2 had been experimentally studied.The optimum toughening effectiveness was acquired when the mass ratio of PU elastomer to nano-SiO2 equaled to 5∶1.There existed a synergism in toughening between nano-SiO2 and PU elastomer,and nano-SiO2 played a function of reinforcer.When the mass ratio of PU elastomer to nano-SiO2 to PVC was 5∶1∶20,the modified material has excelllent comprehensive properties with the impact strength of 45.6kJ/m2 and tensile strength of 50.3MPa.更多还原