Water Transportation in Epoxy Resin
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- 作者：Liang Li ; ShuYong Zhang ; YueHui Chen ; MoJun Liu ; YiFu Ding ; XiaoWen Luo ; Zong Pu ; WeiFang Zhou ; and Shanjun Li
- 刊名：Chemistry of Materials
- 出版年：2005
- 出版时间：February 22, 2005
- 年：2005
- 卷：17
- 期：4
- 页码：839 - 845
- 全文大小：129K
- 年卷期：v.17,no.4(February 22, 2005)
- ISSN：1520-5002
文摘
In the present work, water sorption behaviors at different temperatures ranging from 20 to 80 
C weremonitored in a model Novolac cured epoxy resin (EP) and its esterfied ramifications (with CH3COO,CH3CH2CH2COO, and C6H5CH2COO side groups referred to as EPA, EPB, and EPP, respectively). Inlight of gravimetric measurements and positron annihilation lifetime spectroscopy, a sorption mechanismwas established, which suggested that the equilibrium water content was thermodynamically controlled,while the diffusion process was kinetically controlled. The driving force of the diffusion resulted inenergy released by the hydrogen bonds, whereas the transportation rate was essentially subject to thelocal-chain mobility as well as the dissociation of water molecules from the epoxy network. To verifythis model, dynamic mechanical analysis and time-resolved attenuated total reflection Fourier transforminfrared spectroscopy experiments were employed. With generalized two-dimensional correlation analysis,the results obtained from IR spectra were consistent with the mechanism proposed.
C weremonitored in a model Novolac cured epoxy resin (EP) and its esterfied ramifications (with CH3COO,CH3CH2CH2COO, and C6H5CH2COO side groups referred to as EPA, EPB, and EPP, respectively). Inlight of gravimetric measurements and positron annihilation lifetime spectroscopy, a sorption mechanismwas established, which suggested that the equilibrium water content was thermodynamically controlled,while the diffusion process was kinetically controlled. The driving force of the diffusion resulted inenergy released by the hydrogen bonds, whereas the transportation rate was essentially subject to thelocal-chain mobility as well as the dissociation of water molecules from the epoxy network. To verifythis model, dynamic mechanical analysis and time-resolved attenuated total reflection Fourier transforminfrared spectroscopy experiments were employed. With generalized two-dimensional correlation analysis,the results obtained from IR spectra were consistent with the mechanism proposed.