尼龙1010/硅灰石复合材料的热性能研究

Study on Thermal Properties of Nylon1010/Wollastonite Composites

通过熔融共混法制备了尼龙1010/硅灰石复合材料,研究了复合材料的热膨胀性能、热变形温度、热分解过程和熔融及结晶行为。结果表明,与纯尼龙1010相比,尼龙1010/硅灰石复合材料的热膨胀系数及其温度依赖性大幅下降。当硅灰石质量分数为70%时,复合材料的热膨胀系数及其随温度的增加率分别只有纯尼龙1010的29%和15%。复合材料的热变形温度随硅灰石含量的增加大幅升高,当硅灰石质量分数为70%时,热变形温度由纯尼龙1010的63℃升高到178℃;复合材料的起始热分解温度和最大热分解速率时的温度均明显升高。硅灰石的加入显著提高了尼龙1010的热稳定性。尼龙1010的熔融温度和结晶温度不受硅灰石的影响,复合材料熔体仍具有良好的加工成型性。

Nylon1010/wollastonite composites were prepared by melt blending. The thermal expansion coefficient,heat deflection temperature,thermal decomposition,melting and crystallization behaviors were studied. The results show that the thermal expansion coefficient and its dependence on temperature of nylon1010/wollastonite composites decrease dramatically with the increasing of the wollastonite content. The thermal expansion coefficient of nylon1010 with wollastonite mass fraction of 70%and its increment rate are 29%and 15%of the pure nylon1010 respectively. The heat deflection temperature of the composites gradually increases with wollastonite content increasing,when the mass fraction of wollastonite is 70%,the heat deflection temperature is 178℃from 63℃of the pure nylon1010. The initial decomposition temperature and the temperature of the maximum thermal decom-position rate of the composites raise obviously. So,with the addition of wollastonite,the thermostability of nylon1010 got much better. The addition of wollastonite don’t effect almost the melting temperature and crystallization temperature of nylon1010,the composites have good extrusion and injection molding performance.