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Polymerization of Bisphenol A Epoxy Resin with Polyethylene glycol 被引量:2
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作者 Zhen Zhong YANG de lu zhao Mao XU(Polymer Physics Laboratory, Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100080) 《Chinese Chemical Letters》 SCIE CAS CSCD 1997年第8期725-728,共4页
The catalyst boron trifluoride etherate was used to catalyze the reaction of epoxy resin with polyethylene glycol (PEG), and the effect of the concentration of the catalyst on the reaction is studied. It is shown that... The catalyst boron trifluoride etherate was used to catalyze the reaction of epoxy resin with polyethylene glycol (PEG), and the effect of the concentration of the catalyst on the reaction is studied. It is shown that there exist two competitive reactions : I, self polymerization of epoxy resin via chain growth and II, copolymerization of epoxy resin with PEG via step growth. At high concentration of the catalyst reaction I dominates and reaction II is negligible. On the contrary, at low concentration of the catalyst, reaction II dominates and block copolymers are formed In the intermediate case, the two reactions are comparable with the result that a gel structure is obtained. 展开更多
关键词 PEG Polymerization of Bisphenol A Epoxy Resin with Polyethylene glycol
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Rheological Behavior of Epoxy Resin Concentrated Dispersions
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作者 Zhen Zhong YANG Wei Wei WANG +1 位作者 de lu zhao Mao XU (1 Institute of Chemistry. The Chinese Academy of Sciences, Beijing 1000802 School of Basic Medical Science. Capital University of Medical Science, Beijing 100054) 《Chinese Chemical Letters》 SCIE CAS CSCD 1999年第10期867-870,共4页
For the concentrated dispersions of epoxy resin prepared by phase inversion emulsification technique, the effects of solid content and temperature on the rheological behavior are studied. It is found that there exists... For the concentrated dispersions of epoxy resin prepared by phase inversion emulsification technique, the effects of solid content and temperature on the rheological behavior are studied. It is found that there exists reversible structural transition in concentrated dispersions subjected to shearing. The viscosity oscillation correlated with high viscoelasticity at lower stress is remarkable in highly concentrated dispersions. There exists storage modules overshot at higher stress during the dynamic stress time ramp test. This could provide some information on dynamics of structure changes during shear action. Besides, the effects of solid content and temperature on the relationship between tangent delta and frequency are essentially different. 展开更多
关键词 rheological behavior waterborne dispersion bisphenol A epoxy resin
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