含相变材料微胶囊的丙烯腈-丙烯酰胺共聚物的结构与性能

Fabrication and Properties of Polyacrylonitrile-Acrylamide Copolymers Containing Microencapsulated n-Octadecane

采用水相沉淀聚合法制备了丙烯腈(AN)-丙烯酰胺(AM)共聚物以及含有正十八烷微胶囊的AN/AM共聚物。采用傅立叶变换红外光谱(FT-IR)、核磁共振(1H-NMR)、差热分析(DSC)和X射线衍射(XRD)等方法对聚合产物进行了分析。结果表明,AM的引入改变了聚合物的环化机理,从自由基环化机理过渡为离子环化机理。随着共聚物中AM含量的增加,分解温度(Td)呈现出先降低后升高的变化趋势;但含有正十八烷微胶囊的AN/AM共聚物的Td则随着聚合物中微胶囊含量的增加而持续升高。共聚物的熔点(Tm)随着AM或正十八烷微胶囊含量的增加而降低。

Polyacrylonitrile （ AN ）-Acrylamide （ AM ） eopolymers were synthesized by redox polymerization in water; and the microencapsulated n-octadecane was incorporated at the step of polymerizatiorr The composition, melting point （Tm ）, decomposition temperature （ Td ） and crystallinity of the eopolymers were studied by using Fourier Transform Infrared Spectroscopy （FT- IR）, Nuclear Magnetic Resonance （^1H-NMR）, Differential Scanning Calorimetry （DSC） and X-ray Diffraction （XRD） etc. The presence of AM changes the cydization reaction mechanism of eopolymers from free radical to ionic. Td drops firstly and then rises with the molar ratio of AM increasing. By contrast, it rises with the contents of microencapsulated n-octadecane increasing continually. Tm drops with the molar ratio of AM and/or the microencapsulated n-octadecane contents increasing.