嵌段齐聚物修饰纳米SiO_2对PET结晶性能的影响

Effect of Nano-SiO_2 Modified by Block Oligomer on the Crystallization Property of PET

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40~50 nm；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。

The surface of nano-silica was modified by the oligomer chains PEG and LMPET by solution poly-merization,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 re-sults indicated that LMPET was successfully linked onto SiO2 surface through PEG,and the average size of nanopati-cle 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.