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Synthesis and characterization of dicyanate monomers containing methylene spacers
Author(s) -
Anuradha G.,
Sarojadevi M.
Publication year - 2008
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.28616
Subject(s) - limiting oxygen index , monomer , phenol , yield (engineering) , methylene , polymer chemistry , cyanate , cyanate ester , char , chemistry , fourier transform infrared spectroscopy , carbon 13 nmr , nuclear chemistry , polymer , materials science , organic chemistry , pyrolysis , chemical engineering , epoxy , engineering , metallurgy
Abstract The bisphenols containing methylene spacer were prepared by treating eugenol/2‐allyl phenol with 2,6‐dimethyl phenol/guiacol/ o ‐cresol in the presence of AlCl 3 . All the bisphenols were converted to their respective cyanate esters by treating with CNBr. The structural confirmation was done by FTIR, 1 H NMR, 13 C NMR spectral methods, and elemental analysis. Thermal characterization was done by DSC and TGA. DSC transition shows that the T g is in the range of 208–239°C. The T g is highest for the cyanate ester Cy(b) with symmetric structure. The T g of the cured network depends on the length and symmetry of the monomer, T g being higher for shorter and the para‐substituted monomers. The T 10 values are in the range of 364–381°C. The char yield is in the range of 47–53%. From the char yield, the limiting oxygen index (LOI) value was determined, which is used to confirm the flame retardancy of the cyanate ester resins. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008