摘要
采用偏光显微镜观察和研究了三种不同表面处理的纳米SiO2 改性PP的结晶结构 ,并通过DSC分析方法 ,研究了它们的结晶特性。结果表明 :纳米SiO2 在PP中具有成核剂作用 ,PP以异相成核方式结晶 ,使PP的结晶温度提高 ,结晶速率增大 ,球晶颗粒变得细小而均匀 ,但基本不影响PP的结晶度和熔点。纳米SiO2 在PP中的粒度越小 ,分散越均匀 ,或适当提高其含量 ,上述作用越明显。纳米SiO2 的表面处理对PP/纳米SiO2 材料的结晶结构和特性影响很大 ,其中经表面偶联剂加分散剂处理的纳米SiO2 -AB对PP结晶的上述影响最为明显。
Crystal structure and characteristics of three polypropylene/nano-SiO-2(PP/nano-SiO-2) composites with different surface-treated SiO-2 are observed and studied by polarizing microscope and DSC respectively.Results show that nano-SiO-2 acts as a nucleation agent in PP and heterogeneous nucleation domains during the crystallization,thus upgrading the crystal temperature and nucleation rate.The spherulites of the crystal become small and even,but basically there is little effect on crystalline degree and melt point.The finer the nano-SiO-2 is,the more even the dispersion is.The same phenomenon occurs while increasing the content of nano-SiO-2.The surface treatment of nano-SiO-2 has obvious influence on crystal structure characteristics of the system.It is concluded that nano-SiO-2 functions as a reinforcing and toughening agent.
出处
《中国塑料》
CAS
CSCD
北大核心
2002年第1期23-27,共5页
China Plastics
