【摘要】 采用溶液聚合法在纳米SiO2表面接枝两种不同性质的齐聚物聚乙二醇(PEG)和聚对苯二甲酸乙二酯低聚物(LMPET),通过FTIR、1 H-NMR、XPS和HR-TEM对其结构形貌进行表征。采用熔融共混制备PET纳米复合材料,并利用DSC和XRD对改性纳米SiO2对PET结晶性能的影响进行研究。结果表明,LMPET通过PEG成功接枝到SiO2表面,粒径尺寸为40~50nm;纳米SiO2可作为成核剂诱导PET的结晶提高结晶速率,当添加量为2%(质量分数)时,结晶温度得到明显提高。更多还原

【Abstract】 The surface of nano-silica was modified by the oligomer chains PEG and LMPET by solution polymerization,and its structure morphology was confirmed by FTIR,1 H-NMR,XPS and HR-TEM.PET nanocomposite was prepared via melt blending,the effect on crystallization behavior of PET was studied by DSC and XRD.The results indicated that LMPET was successfully linked onto SiO2 surface through PEG,and the average size of nanopaticle is about 40-50 nm.It was found that organic silicas could act as nucleating agents in polymer matrix and facilitate the crystallization rate,when the content of modified SiO2 was about 2wt%,the crystallization temperature of PET nanocomposite was improved significantly.更多还原