苯乙烯－丙烯嵌段共聚物等温结晶动力学的研究

Studies on Isothermal Crystallization Kinetics of iPS-b-iPP Block Copolymer

用ＤＳＣ法研究苯乙烯－丙烯嵌段共聚物（ｉＰＳ－ｂ－ｉＰＰ）的等温结晶动力学．结果表明，在所选择的结晶温度（１２７～１３２℃）范围内，共聚物很好地符合Ａｖｒａｍｉ动力学方程；共聚物结晶温度、结晶速率、结晶成核和生长方式都与共聚物结构和组成比有关，随着嵌段共聚物中ｉＰＳ段含量的增加，结晶速率和Ａｖｒａｎｕ指数（ｎ）明显降低．

The isothermal crystallization Kinetics of styrene/propylene block copolymer(iPSb-iPP)has been investigated by DSC. The results indicated that the kinetics of isothermal crystallization for all of samples was fitted for the Avrami,equation quite well within selected crystallization temperature(127-132℃),and that the crystallization temperature, crystallization rate and crystal growing mechanism were affected by the composition ratio of iPS-biPP. With the increase of the content of iPS block in iPS-b-iPP copolymers crystallization rate(G)and Avrami exponent(n) were significantly reduced.In addition, a discussion about the relationship between the growing mechanism of crystals and the composition ratio of iPSb-iPP was made based on the Avrami exponents and TEM.