聚甲基苯基硅氧烷微球对聚碳酸酯性能的影响

Effect of Poly(methyl phenyl silsesquioxane) Microspheres on Properties of Polycarbonate

研究了不同含量聚甲基苯基硅氧烷微球(PMPSQ)对聚碳酸酯(PC)阻燃性能、加工性能和力学性能等的影响。结果表明,随着 PMPSQ 含量的增加,冲击强度呈先上升后下降的趋势,PMPSQ 含量为5%时,冲击强度达到最大值,较空白 PC 提高了71.5%。PC 的阻燃性能随 PMPSQ 含量的增加而升高,当 PMPSQ 含量为5 %时,氧指数达到32.1%,较空白 PC 提高了23.0%。随着 PMPSO 含量的增加,PC 的玻璃化转变温度(T_g)逐渐下降,PMPSQ 含量为5%时,PC 的 T_g 从空白时的144.5℃降低至139.1℃。流变学分析表明,PMPSO 的加入可以有效降低 PC 的表观黏度,改善材料的加工性能。

The effect of poly（methyl phenyl silsesquioxane） （PMPSQ） on flame retardant, rheological, thermal and mechanical properties of polycarbonate （PC） was investigated. As the content of PMPSQ increased from 0 to 5 %, the impact strength of PC increased by 71.5 % and the LOI value increased by 23 %. Further increasing the content of PMPSQ, no additional improvement was observed. The inclusion of PMPSQ reduced the glass transition temperature（Tg） of PC, PMPSQ of 5 % caused Tg of PC decreased from 144.5 ℃ to 139.1 ℃. PMPSQ also resulted in reduction of the apparent viscosity of PC and thus enhanced its processability.