【摘要】 本文研究了聚碳酸酯(PC)和聚碳酸酯/聚乙烯(PC/PE)合金材料热水老化后的分子量降解规律,实验结果表明:PC耐热水老化性能很差,在100℃沸水中,分子量平均每天下降700左右,而PC/PE合金材料具有较优良的耐热水老化性能,在100℃沸水中分子量平均每天下降180左右,PC/PE在沸水中的使用寿命提高3倍以上。文中还计算了PC和PC/PE材料在热水老化过程中的水解活化能,水解活化能E=20KCal/mol。进一步研究表明,PC与PC/PE合金材料在热水老化过程中的水解方式有差别,纯PC材料中的PC大分子水解主要发生于大分子链的无规断链,而在PC/PE合金材料中的PC大分子水解主要发生于大分子链端基附近。更多还原

【Abstract】 This paper investigated the molecular weight degradation regularity of PC and alloy of PC and PE after hot water aging. The experiment showed PC had poor resistance of hot water aging, the molecular weight . reduced about 700 on the average a day in the boiling water of 100; while the alloy of PC and PE had better resistance of hot water aging, the molecular weight reduced about 180 on the average a day in the boiling water of 100℃ and the service life in the boiling water increased by 3 times. The paper calculated the Hydrolytic activation energy of PC and alloy of PC and PE in the process of hot water aging, hydrolytic activation energy E = 20 Kcal/ mol. Further investigation showed difference of hydrolytic mode between PC and alloy of PC / PE in the process of hot water aging. The hydrolysis of PC macromolecule in pure PC mainly happened at random chain rupture in macromolecular chain, while the hydrolysis of PC macromolecule in alloy of PC / PE dominantly occurred adjacent to the radical end in macromolecular chain.更多还原