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Resorcinol in high solid phenol−formaldehyde resins for foams production
Author(s) -
Liu Juan,
Chen RiQing,
Xu YuZhi,
Wang ChunPeng,
Chu FuXiang
Publication year - 2017
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.44881
Subject(s) - resorcinol , formaldehyde , phenol , curing (chemistry) , reactivity (psychology) , materials science , thermal stability , chemistry , copolymer , molar ratio , nuclear chemistry , polymer chemistry , chemical engineering , organic chemistry , catalysis , polymer , engineering , medicine , alternative medicine , pathology
The acid curing agent content and foaming temperature could be reduced by improving the resol reactivity. In this study, highly active and solid phenol−resorcinol−formaldehyde copolymer resins (PRFRs) with different resorcinol/phenol ( R / P ) molar ratios and formaldehyde/(phenol + resorcinol) [ F /( P + R )] molar ratios were synthesized through the copolymerization of resorcinol, formaldehyde, and phenol. Phenol−resorcinol−formaldehyde foams (PRFFs) were prepared with synthetic PRFRs. The results showed that PRFR‐2 exhibited higher reactivity, faster curing speed, and better thermal stability. In addition, the foam produced with the PRFR‐2 had improved mechanical and flame retardation properties and a compressive strength of 0.18 MPa, a flexural strength of 0.25 MPa, and a limited oxygen index (LOI) greater than 37%. The increased reactivity of the PRFRs correlated with the changing mechanical properties of PRFFs because of the effects of resorcinol and the molar ratio of formaldehyde to phenol and resorcinol. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44881.