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Donya, A. P.; Pakter, M. K.; Shalimova, M. A.; Lambin, V. N.

doi:10.1023/a:1015605002620

Cited by 9 publications

(5 citation statements)

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“…The reported relative reactivity ratios in the literature calculated for pair of styrene St and FSt ( r St = 0.961, r FSt = 0.853) are similar to our values . Moreover, it was found that relative reactivity ratios calculated for others comonomers such as St/4‐chlorostyrene ( r St = 0.74, r ClSt = 1.03) and St/4‐bromostyrene ( r St = 0.7, r BrSt = 1.0) indicated also tendency to form random composition of copolymer, similarly as compounds presented herein St/FSt .…”

Section: Resultssupporting

confidence: 89%

Synthesis of polystyrene modified with fluorine atoms: Monomer reactivity ratios and thermal behavior

et al. 2013

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Homo‐ and copolymers of 4‐fluorostyrene (FSt) and styrene (St) were synthesized with different feed ratios using free radical bulk polymerization with azobisisobutyronitrile (AIBN) as initiator. It yielded series of (co)polymers with various amounts of included FSt, P(St‐co‐FSt) (5–50 mol%) and PFSt. The effect of the initiator concentration on the molecular weights of the homopolymers, that is, PSt and PFSt was investigated. Copolymer compositions were determined by nuclear magnetic resonance spectroscopy. The relative reactivity ratios of both comonomers were determined by applying the conventional linearization methods of Jaacks (J), Finemann–Ross (F–R), inverted Finemann–Ross (IF–R), and Kelen‐Tüdos (K–T). The reactivity ratios values of St and FSt obtained from J plot are 1.06 and 0.84, F–R plot are 1.18 and 1.06, IF–R 1.01 and 0.86, and K–T plot 1.04 and 0.88, respectively. Thermal properties of prepared (co)polymers, that is, glass transition temperature (Tg) and thermal stability, were determined from differential scanning calorimetry and thermogravimetrical measurements. The lack of significant influence of FSt comonomer content on Tg of (co)polymers was observed. Additionally, the thermal degradation kinetics of obtained PSt and PFSt was studied by thermogravimetric analysis. Kinetic parameters such as the thermal decomposition activation energy (E) and frequency factor (A) were estimated by Ozawa model [E(O) and A(O), respectively] and Kissinger model [E(K) and A(K), respectively]. The activation energy and the frequency factor of PFSt (253 kJ/mol) were higher than PSt (236 kJ/mol). The resulting activation energies estimated using the two methods were quite close. POLYM. ENG. SCI., 54:1170–1181, 2014. © 2013 Society of Plastics Engineers

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Section: Resultssupporting

confidence: 89%

Synthesis of polystyrene modified with fluorine atoms: Monomer reactivity ratios and thermal behavior

et al. 2013

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“…These parameters slightly vary because of the temperature at which copolymerization was carried out. For the systems St/ClSt and St/BrSt, values of reactivity ratios reported in the literature are completely different ( r St = 0.74, r ClSt = 1.03; r St = 0.70, r BrSt = 1.00), indicating a tendency to form copolymers of random composition.…”

Section: Resultsmentioning

confidence: 84%

“…35 These parameters slightly vary because of the temperature at which copolymerization was carried out. For the systems St/ClSt and St/BrSt, values of reactivity ratios reported in the literature are completely different (r St = 0.74, r ClSt = 1.03; r St = 0.70, wileyonlinelibrary.com/journal/pi r BrSt = 1.00), 34,36 indicating a tendency to form copolymers of random composition. As mentioned above, the Fineman-Ross method was applied for confirmation of the reactivity ratios of 5FSt and St calculated using the Jaacks method.…”

Section: Molecular Weight Of Polymersmentioning

confidence: 90%

Halogeno‐modified polystyrene: monomer reactivity ratios, thermal behaviour and flammability

Wiacek

Wesołek

Rojewski

et al. 2014

Polymer International

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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 1 H 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.

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“…7 N-Substituted 4-iminopentan-2-ones belong to bidentate Schiff bases derived from acetylacetone. Theoretically they can occur in three tautomeric forms: 4-iminopentan-2-one, 4-aminopent-3-en-2-one and 4-iminopent-2-en-2-ol.…”

mentioning

confidence: 99%

Mass spectrometric behaviour of 4-(arylimino)pentan-2-ones substituted with a halogen atom in the aromatic ring

ski

Gierczyk

2000

J. Mass Spectrom.

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Cited by 9 publications

References 0 publications

Synthesis of polystyrene modified with fluorine atoms: Monomer reactivity ratios and thermal behavior

Synthesis of polystyrene modified with fluorine atoms: Monomer reactivity ratios and thermal behavior

Halogeno‐modified polystyrene: monomer reactivity ratios, thermal behaviour and flammability

Mass spectrometric behaviour of 4-(arylimino)pentan-2-ones substituted with a halogen atom in the aromatic ring

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