Studies of Curing Process of Epoxy Resin and Thermal Behavior of Cured Resin by Pulsed NMR

The curing reaction of epoxy resin and thermal behavior of cured resin were studied by pulsed NMR. 1H solid train echo signals were recorded by using pulsed NMR during the curing. Three 1H spin-spin relaxation times, namely, T2L （long）, T2s （short）, and T2M （intermediate）, were estimated from the ob...

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Bibliographic Details
Published in:材料科学与工程：中英文A版 2014, Vol.4 (9), p.275-281
Main Author: Hiroki Kimoto Chikako Tanaka Takuzo Kurotsu
Format: Article
Language:Chinese
Subjects:
分子运动
回波信号
固化反应
固化树脂
工艺
环氧树脂
脉冲核磁共振
行为研究
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Summary:The curing reaction of epoxy resin and thermal behavior of cured resin were studied by pulsed NMR. 1H solid train echo signals were recorded by using pulsed NMR during the curing. Three 1H spin-spin relaxation times, namely, T2L （long）, T2s （short）, and T2M （intermediate）, were estimated from the observed solid echo trains. T2L corresponded to unreacted highly mobile components, and T2s corresponded to the rigid polymer produced with a highly cross-linked three-dimensional network. The extent of the curing reaction could be monitored through the fraction of T2S, Ps. The spin-lattice relaxation time, T1, was also measured to check another aspect of molecular motion in the process. We could also monitor the curing reaction by T1. Moreover, the temperature dependence of cured resin was measured. It is suggested that decomposition of cured resin has occurred above 100 ℃ to liberate low molecular weight components of un-reacted epoxy resin or curing agent. Pulsed NMR is a useful tool to monitor the hardening proce
ISSN:2161-6213