Anionic solution copolymerization of α-methylstyrene with conjugated dienes above the ceiling temperature of α-methylstyrene

Halasa, Adel F.; Seo, Kwang Su

doi:10.1016/j.eurpolymj.2013.11.017

Cited by 4 publications

(2 citation statements)

References 15 publications

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“…In the recent years, poly(α-methyl styrene) (PAMS) has captured considerable attention due to its unique chemical structure along with its substantial properties, cost-effectiveness and robust performance in blending modi cation, adhesive formulation, and paper coating [1,2]. The synthesis of PAMS involves intricate polymerization processes, with various methods being employed to achieve controlled polymer chain growth [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Characterization and kinetics study of poly(α-methyl styrene) synthesized by living anionic polymerization

Jozaghkar,

Ziaee

2024

J Polym Res

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In this work, poly(α-methyl styrene) (PAMS) was synthesized through living anionic polymerization and characterized by 13 C NMR, 1 H NMR, GPC, TGA, DSC. The kinetics study was performed using multi-stage dosing of initiator. The results obtained via GPC analysis revealed that polydispersity index of the synthesized PAMS was close to the true value. Moreover, multi-stage dosing of initiator offers valuable and accurate method to determine propagation rate constant and initial impurities value of the system. 13 C NMR analysis demonstrated that Bernoullian statics model exhibits a superior t compared to 1storder Markov statics model for the assigned sequence. Furthermore, the synthesized PAMS presents higher degree of racemic addition with P m =0.439. 1 H NMR spectroscopy was utilized to ascertain number-average molecular weight of the synthesized samples, corroborating the values estimated through GPC analysis. From the thermal analysis, it was shown that PAMS containing very low molecular weight demonstrates negative glass transition temperature and broad thermal decomposition range.

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Section: Introductionmentioning

confidence: 99%

Characterization and kinetics study of poly(α-methyl styrene) synthesized by living anionic polymerization

Jozaghkar,

Ziaee

2024

J Polym Res

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“…The estimates for the value of T c for polyisobutylene vary from 88–120 °C. , Other hydrocarbon polymers, like poly(α-methylstyrene), can have even lower T c values. Low T c values are not uncommon for other types of polymers if the bond energies for the π bond of the monomer and the monomer–monomer σ bonds in the product polymer are more comparable. , In some cases, the inability to have an enthalpic driving force precludes polymerization. For example, the polymerization via ring-opening metathesis polymerization (ROMP) of a relatively unstrained alkene like cyclohexene is not possible because there is little difference in energy between the product polymer and the monomer cyclohexene.…”

Section: Introductionmentioning

confidence: 99%

Enthalpy-Driven Polyisobutylene Depolymerization

2019

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Polyisobutylene (PIB) oligomers containing terminal alkene groups depolymerize rapidly at room temperature in the presence of trifluoromethanesulfonic acid and an arene solvent like benzene. This dramatically lower temperature depolymerization behavior is due to an enthalpically driven process wherein the isobutylene groups formed by a chain scission event after reacting a strong Brønsted acid with alkene groups at the polyisobutylene oligomer terminus are trapped by the solvent. In an arene solvent like benzene or toluene, tert-butyl carbocations formed from this isobutylene group rapidly react with benzene or toluene in a thermodynamically favorable process to form tert-butylarene products. This process is presumably favored in part because the C sp2 −C sp3 bond that forms tertbutylarene is stronger than the C sp3 −C sp3 bonds in the polyisobutylene polymer. These studies show that polyisobutylene oligomers depolymerize in only a few minutes at ambient or even sub-ambient temperature using this chemistry.

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Investigation of poly(α-methyl styrene) tacticity synthesized by photo-polymerization

2020

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Anionic solution copolymerization of α-methylstyrene with conjugated dienes above the ceiling temperature of α-methylstyrene

Cited by 4 publications

References 15 publications

Characterization and kinetics study of poly(α-methyl styrene) synthesized by living anionic polymerization

Characterization and kinetics study of poly(α-methyl styrene) synthesized by living anionic polymerization

Enthalpy-Driven Polyisobutylene Depolymerization

Investigation of poly(α-methyl styrene) tacticity synthesized by photo-polymerization

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