碱化蒙脱土改性浇铸尼龙6复合材料的制备及性能研究

Preparation and Properties of Nylon 6 Composites Modified by Alkalized Montmorillonite

通过对MMT进行碱化处理,使MMT层间生成浇铸尼龙的催化剂己内酰胺钠,从而在MMT层间催化浇铸尼龙聚合,制备了MMT/MCPA6纳米复合材料。利用TG、DSC、HDT、SEM和力学性能测试表征了其结构与性能。结果表明,碱化MMT能诱导浇铸尼龙γ晶型的产生,提高材料的结晶度,使γ晶体含量随MMT质量分数的增加而增加。MMT起热阻隔作用,使复合材料的热分解温度有所提高,残炭率增加,而且复合材料的维卡软化点温度提升至231℃,热变形温度提高至114℃。碱化MMT能使复合材料韧性保持在一定水平的情况下,强度得到了大幅度的提高。

Through the alkaline treatment of MMT,caprolactam sodium,being the catalyst of monomer casting nylon,was generated between MMT layers.The MMT/MCPA6 composites were prepared.The structure and properties were characterized by TG,DSC,HDT,SEM and mechanical properties.The results showed that the alkaline MMT could induce the generation of nylon γ crystal and increase the crystallinity of the material.The γcrystal content increased with the increase of MMT content.MMT performed a thermal barrier effect,so that the thermal decomposition temperature of the composite material was improved,with the increase in carbon yield.The thermal decomposition temperature of the composites was enhanced to 231 ℃ and the heat distortion temperature increased to 114 ℃.Alkalized MMT kept the toughness of the composite at a certain level,resulting in a significant increase in strength.