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Examining the nature of network formation during epoxy polymerisation initiated with ionic liquids
Polymer ( IF 4.6 ) Pub Date : 2018-07-17 , DOI: 10.1016/j.polymer.2018.07.046
Fiona C. Binks , Gabriel Cavalli , Michael Henningsen , Brendan J. Howlin , Ian Hamerton

A commercial diglycidyl ether of bisphenol A monomer (Baxxores™ ER 2200, eew 182 g/mole, DGEBA) is thermally polymerized in the presence of an ionic liquid, 1-ethyl-3-methylimidazolium acetate at a variety of loadings (5–45 wt %). The loss modulus data for cured samples, containing 5 wt % initiator, display at least two thermal transitions and the highest storage modulus occurs in the sample that has been cured for the shortest time at the lowest temperature. Samples that are exposed to higher temperatures (140, 150 °C) yield more heterogenous networks, whereas following exposure to a much shorter/lower temperature cure schedule (80 °C) exhibits a considerably higher damping ability than the other samples, coupled with a lower glass transition temperature. Differential scanning calorimetry reveals that the latter sample achieves a conversion of 95%, while crosslink densities for the DGEBA samples containing 5 wt % and 15 wt % are respectively 9.5 × 10−3 mol. dm−3 and 1.2 × 10−3 mol. dm−3 (when cured to 80 °C) and 2.0 × 10−2 mol. dm−3 and 2.4 × 10−3 mol. dm−3 (when cured to 140 °C).



中文翻译:

检查由离子液体引发的环氧聚合过程中网络形成的性质

商业化的双酚A单体二缩水甘油醚(Baxxores™ER 2200,eew 182 g / mol,DGEBA)在离子液体1-乙基-3-甲基咪唑鎓乙酸盐存在下,以各种载量(5–45)进行热聚合。重量%)。包含5 wt%引发剂的固化样品的损耗模量数据显示出至少两个热转变,并且在最低温度下经过最短时间固化的样品中出现了最高的储能模量。暴露于较高温度(140、150°C)的样品会产生更多的异质网络,而暴露于更短/更低温度的固化程序(80°C)后,则显示出比其他样品高得多的阻尼能力,并且降低玻璃化转变温度。−3 摩尔 dm -3和1.2×10 -3  mol。dm -3(当固化至80℃时)和2.0×10 -2  mol。dm -3和2.4×10 -3  mol。dm -3(固化至140°C时)。

更新日期:2018-07-17
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