Insight into the role of potassium hydroxide for accelerating the degradation of anhydride-cured epoxy resin in subcritical methanol

被引：26
作者：
Liu, Jie [1 ]
Wang, Kai [1 ]
Ma, Li [1 ]
Tang, Tao [1 ]
机构：
[1] Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
来源：
JOURNAL OF SUPERCRITICAL FLUIDS | 2016年 / 107卷
基金：
中国国家自然科学基金;
关键词：
Epoxy resin; Degradation; Subcritical methanol; Potassium hydroxide; FIBER-REINFORCED POLYMERS; COMPOSITES; DECOMPOSITION; SOLVOLYSIS; WATER;
D O I：
10.1016/j.supflu.2015.07.022
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Degradation of methyl-1,2-cyclohexanedicarboxylic anhydride (MeHHPA)-cured epoxy resin in subcritical methanol in the presence of potassium hydroxide (KOH) was studied. The degraded products of epoxy resin were first separated using vacuum distillation, extraction and preparative high-performance liquid chromatography (HPLC) and then characterized by HPLC, electrospray ionization mass spectrometry (ESI-MS), H-1 and C-13 nuclear magnetic resonance (NMR). The effects of temperature and KOH on the kinetic behavior of degradation and the product distribution were examined. The temperature for the complete degradation of epoxy resin decreased greatly after adding a small amount of KOH. Transesterification was the dominant mechanism of degradation of epoxy resin. Reaction between KOH and epoxy resin and transetherification mechanism were also proposed. KOH improved the reaction mainly as a catalyst with consumption of methanol but contributed little to the reaction as a reagent. The bending properties of recycled epoxy resin with degraded products obtained at different KOH concentrations were also examined. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：605 / 611
页数：7
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