文献类型：期刊文献

英文题名：Catalytic and ortho-directing effect of Zn2+, Mg2+, Ba2+, and Ca2+ metal hydroxides on the preparation of phenolic-formaldehyde resin

作者：Chen, Zhangmin[1,2] Cai, Hanjiang[2] Pan, Yanhong[2] Chen, Yuhe[2] Guo, Rencong[2] Li, Jingpeng[2] He, Sheng[2] Han, Jian[1]

第一作者：Chen, Zhangmin;陈章敏

通信作者：Han, Jian

机构：[1] Central South University of Forestry and Technology, Changsha, China; [2] China National Bamboo Research Center, Key Laboratory of High Efficient Processing of Bamboo of Zhejiang Province, Chinese Academy of Forestry, Hangzhou, China

年份：2018

卷号：32

期号：24

起止页码：2647-2657

外文期刊名：Journal of Adhesion Science and Technology

收录：EI(收录号：20184406013411);Scopus(收录号：2-s2.0-85055696685)

语种：英文

外文关键词：Physicochemical properties - Synthetic resins - Differential scanning calorimetry - Adhesives - Curing - Phenols - Catalysts - Polymerization - Phenolic resins - Epoxy resins - Fourier transform infrared spectroscopy

摘要：A one step method was employed to prepare PF (phenol-formaldehyde) resin adhesive from phenol and formaldehyde with Zn2+, Mg2+, Ba2+, and Ca2+ hydroxides as catalysts, and the physicochemical properties of the resulting polymeric material were analyzed. The viscosity of the liquid adhesive decreased at intermediate catalyst concentrations, while the polymerization rate decreased at the highest concentrations; no clear pattern could be observed between catalyst concentration and solid content. Differential scanning calorimetry (DSC) performed on the PF resin catalyzed by Ba2+ showed that the polymer had a curing exothermic peak at around 110 °C, while the initial curing temperatures of PF resins were affected by the type of metal hydroxide used, and were in the order Ca2+2+2+, Ca2+, and Mg2+ hydroxides. The highest ortho/para ratio was achieved with Ba2+ at a concentration of 0.45 wt.%, which also resulted in the most significant increase in the polymerization rate for the formation of PF resin. ? 2018, ? 2018 Informa UK Limited, trading as Taylor & Francis Group.