ExothermHeat flow(mW/mg)ExothermHeat flo w(mW/mg)1#4#1#050100Temperature(℃)15020025030050100150200250300Temperature（℃）
（a） (b)
Exotherm2#ExothermHeat flow(mW/mg)Heat flo w(mW/mg)5#5#2#50100Temperature(℃)15020025050100Temperature(℃)150200250300
(c) (d)
图5 经螺杆处理前后树脂的DSC曲线
3.6 处理工艺对树脂热性能的影响
树脂经过螺杆处理前后的热性能变化由图6可以看出。树脂的起始热分解温度和热失重达到最快的温度基本保持不变，对于包裹了PET颗粒的PBA树脂而言，其热分解的起始温度和热失重达到最快的温度在处理前后没有变化，因此螺杆加
热处理对树脂的热性能影响不大。 222010018Ratio of retained weight(%)Rate of weight loss(%/min)1614121086420-2-4-6-80100200300400500806040 4#201#4#01002003004005006001#6000Temperature(℃)Temperature(℃)
（a） (b)
4# 20 18100Ratio of retained weight(%) 80 t loss(%/min)Rate of weigh161412108642602#405#202#005#01002003004005006000100200
(c) (d)
图6 经螺杆处理前后树脂的热失重曲线
4.结论
本文以丙烯酸正丁酯（BA）为单体制备了包裹PET颗粒的吸油性树脂，研究分析表明，随着PET颗粒加入量的提高，树脂对三氯乙烯的吸附性能逐渐降低，这是由于PET颗粒的加入占据了树脂的体积，降低了油品分子与树脂的接触面积和几率。但是PET的加入会在树脂内形成刚性骨架，作为对树脂的支撑体，在一定程度上提高了树脂的使用性能。包裹PET颗粒改变了树脂的结晶性能。此外，PET的加入还改变了PBA树脂的热性能，使其热分解过程存在两个阶段，明显区别于未包裹PET颗粒的PBA树脂，在一定程度上改善了树脂的热性能。对于经过双螺杆挤出后的试样，其对三氯乙烯的吸附率显著降低，以至于失去了树脂的高吸油性能，而且试样在三氯乙烯中不能形成凝胶而是以颗粒状分散在溶液中。这是由于单纯的PBA树脂纺丝效果不好，在螺杆挤出过程存在一定程度的热降解。 另外，经过双螺杆挤出后的树脂，其升温结晶十分微弱甚至不存在，在降温过程中的结晶较明显，而其热性能变化不大。由此表明，在一定温度范围内，加热仅
仅对树脂的结晶性能产生较大影响，而对其热性能的影响不大。 参考文献:
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