摘要
利用差示扫描量热法(DSC)、偏光显微镜(POM)以及傅里叶变换红外(FTIR)光谱研究了一种超支化聚酯(HBP)对聚乙二醇(PEG)非等温结晶行为的影响,用Ozawa法、Jeziorny法和莫志深法对非等温结晶动力学进行了分析.结果表明:PEG和HBP/PEG的非等温结晶过程可用Ozawa和莫志深动力学方程描述,与Jeziorny动力学方程不符;超支化聚酯的加入改变了PEG的结晶成核和生长机理,对PEG的结晶有一定的延缓作用.超支化聚酯中的羰基与PEG的端羟基形成的氢键以及超支化聚酯自身较大的分子体积和高度支化的结构所导致的位阻效应是超支化聚酯延缓PEG结晶的主要原因.
The effect of hyperbranched polyester（HBP）on the non-isothermal crystallization behavior of polyethylene glycol（PEG）was studied by differential scanning calorimetry（DSC）,polarizing microscopy （POM）,and Fourier transform infrared（FTIR）spectroscopy.The non-isothermal crystallization data for PEG and HBP/PEG were analyzed by the Ozawa,Jeziorny,and Mo Zhi-Shen methods.The results indicate that the non-isothermal crystallization processes of PEG and HBP/PEG may be described using the kinetic equations of Ozawa and Mo,but do not agree with the Jeziorny equation.The addition of HBP affected the crystallization process and crystal form of pure PEG,and slowed the rate of crystallization.The hydrogen bond formed between the carbonyl group of HBP and the terminated-hydroxyl group of PEG,and the larger size and highly branched structure of HBP are the main reasons for the slower crystallization.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2012年第3期528-535,共8页
Acta Physico-Chimica Sinica
基金
国家自然科学基金(20674032)资助项目~~
关键词
聚乙二醇
非等温结晶
超支化聚酯
差示扫描量热法
Polyethylene glycol
Non-isothermal crystallization
Hyperbranched polyester
Differential scanning calorimetry
