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采用溶液成膜法制备纳米Si3N4/聚己内酯(PCL)复合材料,并通过DSC、偏光显微镜及透射电镜等研究手段分析了纳米Si3N4颗粒对PCL的非等温结晶行为和微观形态的影响。结果表明:改性后的纳米Si3N4粒子在PCL基质中的分散性好于未改性纳米Si3N4;纳米Si3N4具有明显的成核效应,加快了PCL的前期结晶速率,对由成核控制的聚合物结晶前期阶段具有积极作用,而对晶体的生长则具有限制作用,导致聚合物结晶后期速率缓慢,晶体尺寸变小,结晶度下降;当纳米Si3N4的含量为5%时,聚合物结晶温度出现最大值;加快降温速率与添加纳米粒子对聚合物结晶行为的影响具有相似的效果。
Nanosized Si3N4 / polycaprolactone (PCL) composites were prepared by solution film-forming method. The effects of nano-Si3N4 particles on the non-isothermal crystallization behavior and microstructure of PCL were analyzed by means of DSC, polarized light microscope and transmission electron microscope. The results show that the dispersibility of the modified nano-Si3N4 particles in the PCL matrix is better than that of the unmodified nano-Si3N4. The nano-Si3N4 has obvious nucleation effects and accelerates the pre-crystallization rate of the PCL. The early stage of crystallization has a positive effect, but has a limiting effect on the growth of the crystal, resulting in a slow rate of late crystallization of the polymer, a decrease of the size of the crystal and a decrease of the crystallinity. When the content of the nano-Si3N4 is 5%, the crystallization temperature of the polymer is the largest Value; to speed up the cooling rate and adding nanoparticles on the crystallization behavior of the polymer has a similar effect.