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Examining the thermal behaviour of novel aromatic polybenzoxazine blends containing an organophosphorous compound and polyhedral oligomeric silsesquioxane reagents
Author(s) -
Kopsidas Sotirios,
Hamerton Ian
Publication year - 2016
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.5139
Subject(s) - silsesquioxane , thermogravimetric analysis , differential scanning calorimetry , phenylphosphine , materials science , thermal stability , polymer chemistry , glass transition , polymerization , activation energy , monomer , reagent , reactivity (psychology) , nuclear chemistry , chemistry , organic chemistry , composite material , polymer , catalysis , physics , phosphine , thermodynamics , medicine , alternative medicine , pathology
2,2‐Bis(3,4‐dihydro‐3‐phenyl‐2 H ‐1,3‐benzoxazine)propane ( BA ‐a) is blended with various commercial polyhedral oligomeric silsesquioxane ( POSS ) reagents and an organophosphorous compound, bis(4‐hydroxyphenyl)phenylphosphine oxide ( BPPO ), at a range of loadings (1–10 wt%). The influence of the additives on the onset and rate of polymerisation of BA ‐a is examined using differential scanning calorimetry. An initial screen of blends containing various additives (5 wt%) shows that a combination of aminoethylaminopropyl isobutyl POSS ( AEAP ) and BPPO has the greatest effect on reactivity with a reduction in reaction onset of some 65 K and an increase in glass transition temperature of 18 K when compared with the BA ‐a homopolymer. The activation energy for the polymerisation of BA ‐a containing 5 wt% AEAP is determined to be 84–88 kJ mol −1 (using Kissinger and Ozawa kinetic models), with a first‐order rate constant of 1.9 × 10 8 s −1 . The thermal stability of the cured blends containing 5 wt% flame retardant is examined using thermogravimetric analysis, and both onset of degradation and char yield are increased by 15 K and 5%, respectively, when compared with the BA ‐a homopolymer. © 2016 Society of Chemical Industry