熔体自由基反应法制备聚丙烯/碳纳米管复合材料

以2,5-二甲基-2,5-双（叔丁基过氧基）己烷（DHBP）在聚丙烯体系中引发形成自由基，以二硫化四甲基秋兰姆（TMTD）调控自由基反应，通过熔融共混一步法制备了共价接枝的聚丙烯/碳纳米管（PP/CNTs）复合材料。 通过拉曼光谱和透射电子显微镜证明发生了共价接枝反应，并研究了PP/CNTs的结晶性能、热性能与力学性能。 结果表明，发生共价接枝的PP/CNTs与未接枝的PP/CNTs及PP相比，其结晶温度分别提高了2.6和12.0 ℃，热分解温度T5%分别提高了6.4和34.8 ℃，其拉伸强度和拉伸模量略有提高，冲击强度分别提高了56.7%和58.1%。

Preparing Polypropylene/Carbon Nanotubes Nanocomposites by Melt Radical Grafting Reaction

We report a facile melt radical grafting reaction method to fabricate covalent grafted polypropylene(PP)/carbon nanotubes(CNTs) nanocomposites using 2,5-dimethyl-2,5(tert-butylperoxy) hexane peroxide(DHBP) to induce the radical and using tetramethylthiuram(TMTD) to control radical grafting reaction. The covalent grafting reaction was characterized by Raman spectroscopy and TEM. The crystallization, thermal and mechanical properties of the composites were studied. Compared with noncovalent grafted PP/CNTs composites and PP, the covalent grafted nanocomposites showed increased crystallization temperatures(2.6 and 12.0 ℃, respectively) and thermal decomposition temperatures(6.4 and 34.8 ℃, respectively), an increased tensile strength and tensile modulus to a little extent, and increased notched impact strength by 56.7% and 58.1%, respectively.