Longitudinal deformation and rupture of linear flexible-chain polymers

Vinogradov, G. V.; Dreval, V.Ye.; Borisenkova, Ye.K.; Kurbanaliyev, M.K.; Shalganova, V. G.

doi:10.1016/0032-3950(81)90264-1

Cited by 6 publications

(1 citation statement)

References 11 publications

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“…At lower frequencies (ω < 250 Hz), poly(IBOMA- b -C13MA) shows viscoelastic solid behavior, with G ′ dominating. A transition region was observed at high frequencies due to relaxation and dissipation mechanisms. − During this period, the G ″ increases faster than G ′, which resulted in a crossover (where G ′ = G ″) at 250 Hz. At frequencies higher than 250 Hz, a glassy region was observed, where G ″ is higher and increases more sharply in comparison to G ′.…”

Section: Resultsmentioning

confidence: 99%

Nitroxide-Mediated Miniemulsion Polymerization of Bio-Based Methacrylates

Tajbakhsh

Hajiali

Marić

2020

Ind. Eng. Chem. Res.

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Nitroxide-mediated homopolymerization and statistical copolymerization of commercially available methacrylates derived from sustainable feedstocks (isobornyl methacrylate (IBOMA) and a mixture of methacrylic esters with an average alkyl side chain length of 13 units (termed C13MA)) was conducted in organic solvent (toluene) and in dispersed aqueous media using an oil-soluble unimolecular initiator (Dispolreg 007) without any controlling comonomers in a controlled manner. IBOMA homopolymerization in emulsion at 83−100 °C revealed the optimal polymerization temperature of 90 °C giving relatively narrow molecular weight distributions (1.46 < dispersities (Đ) < 1.58) and conversion up to 83% in a relatively short time (2 h). IBOMA/C13MA statistical copolymerizations yielded copolymers with tunable glass transition temperature (T g ) prepared in emulsion (−52 °C < T g < 123 °C) and in organic solvent (−40 °C < T g < 169 °C). Resins made in emulsion at 90 °C proceeded up to 92.7% conversion with monomodal molecular weight distributions (M̅ n up to 68,000 g mol −1 and Đ = 1.62−1.72) and were colloidally stable (24% solids and final average particle sizes of 270−481 nm). Furthermore, chain end fidelity was verified by chain extensions with IBOMA and C13MA monomers in both emulsion and organic solvent. These results constitute a readily scalable route to make polymers via nitroxide-mediated polymerization with controlled architecture using biobased feedstocks without the hazards of bulk or homogeneous organic solvent polymerization.

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