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Curing properties of high‐ Ortho phenol‐formaldehyde resins with co‐catalysis
Author(s) -
Li Jiongjiong,
Zhu Wenjie,
Zhang Jizhi,
Zhang Shifeng,
Gao Qiang,
Li Jianzhang,
Zhang Wei
Publication year - 2019
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.47229
Subject(s) - curing (chemistry) , formaldehyde , catalysis , materials science , phenol , thermal stability , phenol formaldehyde resin , carbonate , sodium carbonate , polymer chemistry , chemistry , composite material , organic chemistry , sodium , metallurgy
In this study, sodium carbonate (Na 2 CO 3 ) was used as a catalyst to prepare high‐ ortho phenol‐formaldehyde (HOPF) resin, and ester and carbonate curing accelerators were used to increase its curing rate. The physicochemical properties of the prepared resins and the mechanism of curing acceleration were investigated. The results showed that, with the addition of Na 2 CO 3 , the ortho / para ratio of methylol groups increased from 7.257 to 27.800. The gel time of the cure‐accelerated HOPF resins decreased from 620 to 240 s as compared with PF resin. The bonding strength of plywood bonded with the cure‐accelerated HOPF resins were all above 0.70 MPa. The curing acceleration was caused by the carbonate ions rather than the metal ions, and a temporary incorporation mechanism apparently occurred for the ester accelerators. The prepared phenolic resin had fast curing rate, low curing temperature, high thermal stability, and favorable mechanical performance, which has potential for industry applications. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47229.