ABSTRACT: 2-[4-(2-hydroxyphenyl)tricyclo[5.2.1.02,6]dec-8-yl]phenol (HPTCDP) were
prepared from dicyclopentadiene (DCPD) and phenol via Friedel-Crafts alkylation.
DCPD-containing phenolic resin (DPR) was also synthesized by incorporating the
DCPD-containing monomer HPTCDP with formaldehyde. DPRwas further modified by
grafting the phosphate group. The phosphorylation was confirmed by a Fourier transform
infrared, 31P-NMR spectroscopy, and an element analysis. The phosphorus content
in the DPR could be successfully tailored to give values of 3.46 to 7.79 wt % by
varying the feeding ratios of the phosphorus group. The thermal stabilities of the
phosphorus-containing polymers were identified by differential scanning calorimeter
and thermogravimetric analysis. The glass transition temperature values were decreased
as the content of phosphorus increased. High char yield 39–47 wt % in
thermogravimetric analysis evaluation and limiting oxygen index values of 27 to 34
were found for all the phosphorylated phenolic resins. Such properties make these
polymers highly promising for flame-retardant applications. © 2000 John Wiley & Sons,
Inc. J Appl Polym Sci 79: 342–349, 2001