聚氯乙烯%2f纳米二氧化硅复合材料的制备与性能研究.pdf

内蒙古人学硕上毕业论文聚氯乙烯/纳米二氧化硅复合材料的制备与性能研究摘要本文使用两种不同乙氧基含量的硅烷偶联剂,Y一氨丙基三乙氧基硅烷'(APTES)和丫-氨丙基甲基二乙氧基硅烷(APMDES),对纳米二氧化硅进行表面修饰,并在修饰后二氧化硅表面成功接枝聚氯乙烯分子链。分别将修饰 r 前后的纳米二氧化硅与聚氯乙烯树脂熔融共混制备PVC/纳米二氧化硅复合材料(PVC/Si02、PVC/Si02一APTES、PVC/Si02-APMDES、 PVC/、PVC/)。通过材料的热重分析和维卡软化温度测定,复合材料的热稳定性较未改性PVC树脂有所提高。力学性能测试和拉伸断面形貌表征表明:PVC/Si02复合材料的拉伸强度和断裂伸长率都比未改性PVC有提高;PVC/,但断裂伸长率降低; PVC/—PVC、PVC/。(Na+.MMT)进行离子交换反应,。将Na+.(NHB) PVC/。热重分析和维卡软化温度测定表明,复合材料的热稳定性相对未改性PVC树脂没有提高。力学性能测试和拉伸断面形貌表征表明, 当Na+. l/3时, 内蒙古大学硕士毕业论文 PREPARATION AND PROPERTY STUDIES OFPOLyVM., CHLORIDE/SILICA PARTICLE POSITES ABSTRACT In our work,two aminosilane coupling agents containing differentnumbers of ethoxyl groups, ),-aminopropyltfiethoxysiliane (APTES) and 7-aminopropylmethydiethoxysilane(APMDES),were used for the surface modificationofsilicananoparticles,andpolyvinylchloride(PVC)was grafted on thesurfaceofmodifiednano— andmodified silicananoparticles were pounded with PVC to prepare PVC/nano—posites (PVC/Si02,PVC/Si02一APTES,PVC/Si02-APMDES,PVC/Si02一APTES-PVC andPVC/Si02一APMDES-PVC).The posites andthepure PVC were characterized using scanning electronmicroscopy(SEM),thermogravimetric analysis(TGA),vicat softeningtemperature results showed pared with thoseofpure PVC,thermal stabilitiesofallthe posites were exhibit ahigher tensile strength and elongation—at—break,PVC/Si02-APTES andPVC/Si02一APMDES posites exhibithigher tensilestrength and a lower elongation-at-break. Tensile strength and elongation-·at—break of PVC/Si02一APTES—PVC and PVC/Si02-APMDES—posites werealmostunchanged. Inaddition,under onditions,the strong electrostaticattraction between nanoparticles andnegative charged Na+一MMT clay particles resulted intheformat