标题：Curing mechanism of alkaline phenolic resin with organic ester
作者：Huang Renhe; Wang Yanmin; Zhang Baoping
作者机构：[Huang Renhe; Zhang Baoping] Shandong Univ Sci & Technol, Sch Chem & Environm Engn, Qingdao 265590, Shandong, Peoples R China.; [Wang Yanmin] Shando 更多
通讯作者地址：[Huang, RH]Shandong Univ Sci & Technol, Sch Chem & Environm Engn, Qingdao 265590, Shandong, Peoples R China.
关键词：organic ester; alkaline phenolic resin; curing process; gel; curing; mechanism
摘要：To study the curing mechanism of alkaline phenolic resin with organic ester, three esters were chosen to react with three systems - alkaline phenolic resin, potassium hydroxide aqueous solution containing phenol, and potassium hydroxide aqueous solution. The variations of pH, heat release and gel pH during the reactions were monitored and measured. Infrared spectroscopy (IR) and thermal gravity analysis (TG) techniques were used to characterize the curing reaction. It was found that organic ester is only partially hydrolyzed and resin can be cured through organic ester hydrolysis process as well as the reaction with redundant organic ester. The sequential curing mechanism of alkaline phenolic resin cured by organic ester was identified as follows: a portion of organic ester is firstly hydrolyzed owing to the effect of the strong alkaline; the gel is then formed after the pH decreases to about 10.8-10.88, meanwhile, the redundant organic ester (i.e. non-hydrolysis ester) starts the curing reaction with the resin. It has also been found that the curing rate depends on the hydrolysis velocity of organic ester. The faster the hydrolysis speed of the ester, the faster the curing rate of the resin.