论文部分内容阅读
用ＤＳＣ研究了共聚聚丙烯－ｇ－丙烯酸（ＥＰＭ－ｇ－ＡＡ）和共聚聚丙烯－ｇ－马来酸酐（ＥＰＭ－ｇ－ＭＡＨ）的热学性质。与未接枝的ＥＰＭ相比，接枝物中丙烯序列的熔融温度峰值Ｔ′ｍ下降了３～５℃，结晶温度的峰值Ｔ′ｃ上升了４～１６℃，熔融热焓ΔＨ′ｍ有一定程度的增加；乙烯序列的Ｔ″ｍ峰降低５～６℃，Ｔ″ｃ略有下降或保持不变，ΔＨ″ｍ则有一定的下降。接枝和未接枝样品中的丙烯序列的等温结晶动力学均可用Ａｖｒａｍｉ方程来描述。在研究的结晶温度范围内，未接枝样品的Ａｖｒａｍｉ指数ｎ为１．５～１．８，接枝样品的ｎ值均大于２，接枝ＥＰＭ中的丙烯序列的结晶速度随接枝含量的增加而升高，这可能是较高的成核速度和晶体增长速度双重作用的结果。
The thermal properties of copolymerized polypropylene-g-acrylic acid (EPM-g-AA) and copolymerized polypropylene-g-maleic anhydride (EPM-g-MAH) were investigated by DSC. Compared with non-grafted EPM, the melting peak temperature T’m of propylene in the grafted product decreased 3 ~ 5 ℃, the peak T’c of crystallization temperature increased 4 ~ 16 ℃, the melting enthalpy ΔH’m was To a certain extent, the T m peak of ethylene decreased by 5 ~ 6 ℃, T “c decreased slightly or remained unchanged, and ΔH” m decreased to a certain extent.The propylene sequence in grafted and non-grafted samples Avrami equation can be used to describe the isothermal crystallization kinetics.The Avrami exponent n of the non-grafted samples was 1.5-1.8 and the n values of the grafted samples were all greater than 2 in the studied crystallization temperature range. Of the propylene sequence crystallization rate increases with the graft content increases, which may be the result of the dual effect of higher nucleation rate and crystal growth rate.