Halogeno-modified polystyrene: monomer reactivity ratios, thermal behaviour and flammability
PBN-AR
Instytucja
Wydział Matematyki, Fizyki i Chemii (Uniwersytet Śląski w Katowicach)
Informacje podstawowe
Główny język publikacji
EN
Czasopismo
POLYMER INTERNATIONAL
ISSN
0959-8103
EISSN
Wydawca
URL
Rok publikacji
2014
Numer zeszytu
11
Strony od-do
1982-1990
Numer tomu
63
Identyfikator DOI
Liczba arkuszy
0,4
Autorzy
Pozostali autorzy
+ 3
Słowa kluczowe
EN
flame retardant
flammability
halogeno-substituted styrene
Ozawa and Kissinger models
polystyrene
thermal properties
Streszczenia
Język
EN
Treść
Chemical modification based on incorporation of flame retardants into polymer backbones was used in order to reduce flammability of polystyrene (PSt). The halogeno-substituted styrenes: 4-chlorostyrene (ClSt), 4-bromostyrene (BrSt) and 2,3,4,5,6-pentafluorostyrene (5FSt) were applied as reactive flame retardants. Homo- and copolymers of these halogeno-substituted styrenes and styrene (St) were synthesized with various feed ratios using free radical bulk polymerization with azobisisobutyronitrile as a initiator. This yielded series of (co)polymers with various amounts of included ClSt, BrSt and 5FSt (5–50 mol% of modified St). Copolymer compositions were determined using 1H NMR spectroscopy. The relative reactivity ratios of the used comonomers were determined by applying conventional linearization methods. The Jaacks (J) method was used for systems including BrSt and ClSt monomers whereas the Fineman–Ross method was additionally used to confirm the values of reactivity ratios of St–5FSt. The reactivity ratios of comonomer pairs obtained from J plots were 0.75 and 0.38 (St–ClSt), 1.65 and 0.46 (St–BrSt), 0.44 and 0.42 (St–5FSt). Glass transition temperature and thermal stability of obtained (co)polymers were determined using differential scanning calorimetry and thermogravimetric analysis (TGA), respectively. The thermal degradation kinetic of PSt, PClSt, PBrSt and P5FSt was studied applying TGA. Kinetic parameters such as thermal decomposition activation energy (E) and frequency factor (A) were estimated using Ozawa and Kissinger models. The resulting activation energies estimated using these two methods were quite close. The values of activation energy (kJ mol−1) increased in the following order: PClSt (E(O) = 216.1) < PSt (E(O) = 219.9) < PBrSt (E(O) = 224.7) < P5FSt (E(O) = 330.9). A pyrolysis combustion flow calorimeter was applied as a tool for assessing the flammability of the synthesized (co)polymers. © 2014 Society of Chemical Industry
Inne
System-identifier
0192500105941
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