以硅烷水解溶液电导率为考察指标，筛选并确定较适宜的硅烷CPTMO （3-氯丙基三甲氧基硅烷）水解体系为：乙醇水溶液体积分数为25%、V（CPTMO）：V（25% EtOH）=1：40、体系pH为10、水解时间为2 h。采用原位合成法制得改性LDHs，以PP复合材料的阻燃性能与机械性能参数为考察指标，考察并确定适宜的LDHs以及复配协效阻燃剂Sb₂O₃的用量。样品检测与分析结果表明，原位合成改性过程中，由于硅烷水解产物硅醇的表面包覆作用，抑制了LDHs的生长，从而使原位合成改性LDHs样品的颗粒细化、吸油值下降、表面能下降，与PP聚合物基体间的相容性、分散性提高；样条燃烧过程中，协效阻燃剂Sb₂O₃与LDHs表面包覆的硅烷[Cl （CH₂）₃Si （OCH₃）₃]受热分解生成HCl反应中，生成了高效阻燃成分氯氧化锑、氯化锑，捕捉并稳定PP受热分解的·H等活性自由基，从而提高复合材料的阻燃性能。

Taking the conductivity of silane hydrolyzing solution as an index,the optimal hydrolysis system of 3-chloropropyl trimethoxy silane (CPTMO) is determined as follows:the volumetric concentration of ethanol solution is 25%,V_(CPTMO):V_(25%EtOH)=1:40,pH value of the system is 10,and the hydrolysis time is 2 h.The modified LDHs is prepared by the in-situ synthesis method.Taking the flame retardant performance and mechanical performance parameters of polypropylene (PP) composite materials as the inspection indicators,the appropriate LDHs and the amount of compound synergistic flame retardant Sb₂O₃ are investigated and determined.The results from sample testing and analysis show that the growth of LDHS is inhibited due to the surface coating of silanol that is a product from silane hydrolysis,which results in the decreases of grain refinement,oil absorption value and surface energy of LDHS samples synthesized in situ,and the increases of compatibility and dispersion between LDHs and PP polymer matrix.During the combustion process of sample spline,Sb₂O₃ reacts with HCl that is generated by the coated[Cl(CH₂)₃Si(OCH₃)₃],generating high efficiency flame retardant components such as antimony oxide and antimony chloride,which capture and stabilize the active radicals such as·H,thus improving the flame retardant performance of the composite.

朱启文(1995-),男,硕士研究生,研究方向为高聚物阻燃材料的制备与应用,2843712994@mail.hfut.edu.cn;杨保俊(1970-),男,博士,教授,研究方向为纳米材料的制备与应用,通讯联系人,bj_yang@hfut.edu.cn。