电子束辐照法制备交联共混物聚(ε-己内酯)/苯乙烯-丙烯腈共聚物的结晶动力学研究

Study on Crystallization Kinetics of Crosslinked Poly(ε-caprolactone)/Styrene-acrylonitrile Copolymer Blends Prepared through Irradiation by Electron Beam

将线形聚(ε-己内酯)(PCL)、苯乙烯-丙烯腈共聚物(SAN)和三烯丙基异三聚氰酸酯(TAIC)熔融共混,通过电子束辐照法制备了3组凝胶含量不同的交联PCL和PCL/SAN共混物样品.采用相差显微镜(PCOM)观察发现PCL与SAN具有良好的相容性.利用示差扫描量热法(DSC)和偏光显微镜(POM)研究了交联PCL和PCL/SAN共混物的等温结晶动力学和非等温结晶行为.结果表明,当体系交联程度相近时,交联聚己内酯的结晶动力学随SAN含量的增加而明显减慢.在SAN含量相同时,交联聚己内酯的结晶速率随交联程度增大而减小.对分离提取的线形和交联组分进行结晶动力学的研究则表明SAN引入对PCL的结晶速率起到了关键性的抑制作用.

Linear PCL(poly(ε-caprolactone)),SAN(styrene-acrylonitrile copolymer)and TAIC(triallyl isocyanurate)were melt blended,and the blends were then subjected to different doses of electron beam irradiation to prepare three series of crosslinked PCL and PCL/SAN blends with different gel contents.The crosslinked PCL/SAN blends were observed by a phase-contrast optical microscope(PCOM),which disclosed that phase separation did not occur,indicating that PCL and SAN components were miscible.Differential scanning calorimetry(DSC)was applied to study isothermal crystallization kinetics of crosslinked PCL and PCL/SAN blends.It was found that for the samples with close crosslinking degrees,the crystallization kinetics of the samples became significantly slower with increasing SAN content.When the SAN contents in the blends were the same,the crystallization rate became slower as the degree of crosslinking increased.For the blends with close degrees of crosslinking,the linear portion and the crosslinked portion were separated from the crosslinked blends,and the study on their respective crystallization kinetics by using DSC and polarized light microscope(POM)revealed that it was the incorporated SAN component rather than the crosslinked network that mainly contributed to the slowdown of crystallization rate of PCL in the crosslinked blends.Furthermore,the non-isothermal crystallization behaviors of the crosslinked blends during the cooling process verified the above conclusion.