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Preparation and characterization of novolak phenol formaldehyde resin from liquefied brown‐rotted wood
Author(s) -
Li GaiYun,
Hse ChungYun,
Qin TeFu
Publication year - 2012
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.36476
Subject(s) - formaldehyde , phenol , phenol formaldehyde resin , flexural strength , materials science , curing (chemistry) , liquefaction , composite material , yield (engineering) , polymer chemistry , chemistry , organic chemistry
Abstract The brown‐rotted wood was liquefied in phenol with phosphoric acid as catalyst and the resulting liquefied products were condensed with formaldehyde to yield novolak liquefied wood‐based phenol formaldehyde resin (LWPF). The results showed that brown‐rotted wood could be more easily liquefied than sound wood in phenol. The residue content of liquefied wood decreased continually with the progress of brown‐rot decay. Both water wash and neutralization and water wash slightly improved the thermofluidity and curing properties of LWPF with a small reduction of LWPF yield. An increase in phenol to wood (P/W) ratio from 2 to 3 slightly improved the flow property of LWPF, but with an accompanied by 20% deduction in the product yield. Increased liquefaction time from 30 min to 60 min showed no significant influence on the resulting LWPF. The moldings fabricated from LWPF yielded higher charpy impact, flexural and flexural modulus strength but yielded lower temperature deflection under load than that of the commercial novolak resin. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012