微米六方BN-KH550/聚丁二酸丁二醇酯耐热性复合膜的制备及性能

为进一步改善聚丁二酸丁二醇酯(PBS)的力学性能和耐热性能,采用硅烷偶联剂KH550改性微米六方氮化硼(h-BN),对PBS进行共混改性,通过熔融共混与开炼压延工艺制备了具有较高耐热性的h-BN-KH550/PBS复合膜。对h-BN-KH550粒子结构和复合膜的力学性能、聚集态结构、断面形貌、结晶性能及热稳定性进行了测试和表征。结果表明:与PBS相比,h-BN-KH550/PBS复合膜的力学性能得到改善,当KH550与h-BN质量比为2∶50、h-BN-KH550与PBS质量比为3∶50时,综合力学性能最优;h-BN-KH550粒子可在PBS中均匀分散;在PBS结晶过程中,h-BN-KH550作为成核剂,使PBS的结晶速率加快,结晶度增大;h-BN-KH550/PBS复合膜的热稳定性显著提高,当h-BN-KH550与PBS质量比为3∶50时,复合膜热分解过程中质量损失为5%、10%、50%时的温度(T5d、T10d、T50d)和热分解峰值温度(Tp)分别提高了30.0、22.6、9.5和10.0℃。

Preparation and properties of micron hexagonal BN-KHSS0/poly (butylene succinate) thermal endurance composite films

In order to significantly improve the mechanical properties and thermal endurance of poly(butylene succinate), the micron hexagonal boron nitride (h-BN) was treated with silane coupling agent KH550, and blended with PBS to modify PBS. The high thermal endurance h-BN-KH550/PBS composite films were prepared through melt blending and rolling mill process. The particle structure of h-BN-KH550 and the mechanical properties, aggregation state structure, fracture morphologies, crystallization property and thermal stability of composite films were investigated. The results reveal that the mechanical properties of h-BN-KH550/PBS composite films are greatly improved compared with PBS. When the mass ratio of KH550 to h-BN is 2:50 and h-BN-KH550 to PBS is 3:50, the comprehensive mechanical properties are optimal. The h-BN-KH550 particles are well dispersed in PBS. During the crystallization process of PBS, h-BN-KH550 can act as nucleating agent and increase the crystallization rate and crystallinity of PBS. The thermal stability of h-BN-KH550/PBS composite films is significantly increased. When the mass ratio of h-BN-KH550 to PBS is 3:50, the temperatures at 5%, 10%, 50% mass loss (T₅^d, T₁₀^d,T₅₀^d) and the peak of pyrolysis temperature (T_p) are increased by 30.0, 22.6, 9.5 and 10.0 ℃ during the pyrolysis process of composite films, respectively.