Surface modification of silica micro-powder (SMP) was performed by using commercially available titanate coupling agent KTTO, and polyvinyl chloride (PVC) based composites were prepared by melting and blending PVC and processing aids with SMP before and after modification as fillers. Through XRD, FT-IR, XPS, SEM characterizations and contact angle test, it is determined that the surface of SMP was chemically modified by KTTO successfully. The dispersity of SMP was improved after the KTTO modification treatment although no change was found in the crystal structure of SMP. Moreover, excellent hydrophobicity was achieved by a layer of organic molecules on the surface of modified silica micro-powder (mSMP). The static and dynamic mechanical properties, heat resistance, thermal conductivity, and thermal stability of pure PVC, SMP/PVC, and mSMP/PVC composites with respect to cross-sectional micromorphology were compared. The results indicate that KTTO modification treatment effectively improved the mechanical properties of mSMP/PVC composites, especially increasing the tensile strength and notched impact strength by 43% and 36%, respectively. A significant enhancement of the interfacial bonding between the mSMP filler and PVC matrix was also identified. Furthermore, the thermal conductivity and thermal stability of mSMP/PVC composite were improved by the KTTO modification. The mSMP/PVC composite has a potential application in plates and profiles for construction and buildings.

采用市售的钛酸酯偶联剂KTTO对二氧化硅微粉（SMP）进行表面改性，通过改性前后以SMP为填料，将PVC和加工助剂熔融共混制备聚氯乙烯（PVC）基复合材料。通过XRD、FT-IR、XPS、SEM表征和接触角测试，确定KTTO成功地对SMP表面进行了化学改性。KTTO改性处理后SMP的分散性得到改善，但SMP的晶体结构没有变化。此外，通过在改性二氧化硅微粉 (mSMP) 表面上的一层有机分子实现了优异的疏水性。纯PVC、SMP/PVC的静态和动态力学性能、耐热性、导热性和热稳定性，和 mSMP/PVC 复合材料的横截面微观形态进行了比较。结果表明，KTTO改性处理有效提高了mSMP/PVC复合材料的力学性能，尤其是拉伸强度和缺口冲击强度分别提高了43%和36%。还确定了 mSMP 填料和 PVC 基质之间的界面结合的显着增强。此外，KTTO 改性提高了 mSMP/PVC 复合材料的导热性和热稳定性。mSMP/PVC 复合材料在建筑和建筑物的板材和型材中具有潜在的应用。特别是拉伸强度和缺口冲击强度分别提高了 43% 和 36%。还确定了 mSMP 填料和 PVC 基质之间的界面结合的显着增强。此外，KTTO 改性提高了 mSMP/PVC 复合材料的导热性和热稳定性。mSMP/PVC 复合材料在建筑和建筑物的板材和型材中具有潜在的应用。特别是拉伸强度和缺口冲击强度分别提高了 43% 和 36%。还确定了 mSMP 填料和 PVC 基质之间的界面结合的显着增强。此外，KTTO 改性提高了 mSMP/PVC 复合材料的导热性和热稳定性。mSMP/PVC 复合材料在建筑和建筑物的板材和型材中具有潜在的应用。