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Polystyrene with trifluoromethyl units: Monomer reactivity ratios, thermal behavior, flammability, and thermal degradation kinetics
Author(s) -
Wiacek Malgorzata,
Wesolek Dorota,
Rojewski Szymon,
Bujnowicz Krzysztof,
Jurczyk Sebastain,
Kurcok Malgorzata,
SchabBalcerzak Ewa
Publication year - 2015
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.42839
Subject(s) - polystyrene , differential scanning calorimetry , materials science , thermogravimetric analysis , styrene , polymer chemistry , glass transition , thermal stability , trifluoromethyl , flammability , copolymer , thermal decomposition , activation energy , polymer , monomer , chemical engineering , chemistry , organic chemistry , thermodynamics , composite material , physics , alkyl , engineering
Chemical modification based on incorporation of flame retardants (FR) into the polymer backbone was used in order to reduce polystyrene flammability. 3‐(trifluoromethyl)styrene (StCF 3 ) and 3,5‐ bis (trifluoromethyl)styrene (St(CF 3 ) 2 ) were applied as reactive FR. Copolymers were synthesized with different feed ratios and it gave series of copolymers with various amounts of StCF 3 and St(CF 3 ) 2 (5–50% mol/mol of St). Glass transition temperature ( T g ) and thermal stability of obtained (co)polymers were determined from differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA), respectively. Kinetic parameters such as the thermal decomposition activation energy ( E ) and frequency factor ( A ) were estimated by Ozawa and Kissinger models. Pyrolysis combustion flow calorimeter (PCFC) was applied as a tool for assessing the flammability of the synthesized (co)polymers. Relative reactivity ratios were determined by applying the conventional linearization Jaacks method ( r St = 1.34 , r StCF3 = 0.54), ( r St = 0.47 , r St(CF3)2 = 0.13). The results suggest that incorporation of fluorinated styrenes into PSt enchance flame retardance. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42839.