Curing of Epoxy Resin by UV-light Triggered Descending Frontal Polymerization†

doi:10.7503/cjcu20140996

Abstract

Abstract:

221 type alicyclic epoxy resin was cured by UV-light initiated descending frontal polymerization. The effect of amount of photo/thermal initiator, pre-heating temperature on the frontal velocity V_f and frontal initiating time t_i was investigated. The structure and thermal properties of the cured products were characterized via Fourier transform infrared spectroscopy(FTIR), thermogravimetric analysis(TG) and differential scanning calorimetry(DSC). The results show that frontal velocity V_f increase with increasing of concentration of photo/thermal initiator or preheating temperature, while frontal initiating time decrease. Analysis of the FTIR spectrum indicates that the products were obtained uniformly. TG and DSC results reveal that the products exhibit good thermal stability.

Key words: Frontal polymerization, Epoxy resin, UV-light initiating, Heading velocity, Thermal property

TrendMD:

ZHOU Jianping, JIA Shijun, FU Wanli, ZHAO Haifang, LIU Zhilei. Curing of Epoxy Resin by UV-light Triggered Descending Frontal Polymerization^†[J]. Chem. J. Chinese Universities, 2015, 36(5): 1019.

Figures/Tables 12

Fig.1 Scheme of the experiment equipment

Fig.2 Mechanism of UV-ignited frontal polymerization

Fig.3 Scheme of photo-frontal polymerization propagationa. Photo-initiating stage; b—i. propagation of polymeriza-

Fig.4 Polymerization front at different time

Fig.5 Effect of the mass fraction of photo-initiator on Vf and ti

Fig.6 Effect of the concentration of the thermal initiator on Vf and ti

Fig.7 Effect of pre-heated temperatures on initiated time

Fig.8 FTIR spectra of 221 resin and its cured roducts by PFP methoda. Epoxy oligomer; b. top-end product; c. low-end product.

Fig.9 FTIR spectra of epoxy resin by different uring methodsa. BF method; b. PFP method.

Fig.10 TG curves of epoxy resin cured by PFP methoda. Low-end product; b. top-end product.

Fig.11 TG curves of epoxy resin cured by BF method(a) and PFP method(b)

Fig.12 DSC curves of product cured by PFP method(a) and thermal curing process(b)

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