聚丙烯/海泡石复合材料的制备、表征及力学性能

Preparation and characterization of polypropylene/sepiolite composites and its mechanical properties

采用十六烷基三甲基溴化铵(CTAB)对海泡石(SEP)进行有机化改性,制备有机改性海泡石(OSEP)和聚丙烯(PP)/SEP复合材料。经SEM、XRD、FT-IR、TG和CA分析,表明海泡石表面吸附有一定量的季铵盐分子,并且部分季铵盐分子顺利进入海泡石孔道。经TG分析,800℃时OSEP的残留质量比SEP提高17.63%。复合材料的拉伸、冲击和WAXD测试表明,OSEP的加入减少了β晶型的含量,增加了α晶粒的含量,有效提高了复合材料的力学性能。当OSEP含量为1.5%时,能获得力学性能较优的复合材料。

Organophilic sepiolite（OSEP）has been prepared by water exchange and absorption between hexadecyl trimethyl ammonium bromide（CTAB）and sepiolite,and the polypropylene（PP）/sepiolite composites were prepared by melt blend in a twin-screw extruder.The organic modification effect of sepiolite was confirmed by SEM,XRD,FT-IR,TG and CA,the results showed that CTAB has entered the channel of sepiolite,and some CTAB was adsorbed on the surface of SEP.The TG test indicated that the residue amount of OSEP increased by 17.63% compared with sepiolite at 800℃.The mechanical properties of composites were also investigated,it is indicated that the tensile and impact strengths of PP are improved effectively when the addition level of OSEP is 1.5%.The analysis of PP/OSEP composite using WAXD also shows that the addition of OSEP results the reduction ofβcrystal and improvement of α crystal.