Synthesis of N-(oxiran-2-ylmethyl)-5-phenyltetrazole and its reactions with nitrogen nucleophiles

Golobokova, T. V.; Vereshchagin, L. I.; Ratovskii, G. V.; Proidakov, A. G.; Kizhnyaev, V. N.

doi:10.1134/s1070428016070216

Cited by 4 publications

(1 citation statement)

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“…It is noteworthy that under the same reaction conditions gel formation in DCE occurs for a much shorter time (tens of minutes) than in toluene (hours) or DMF (days), even at lower concentrations of the polymers, process temperature ( Figure 6) and different ratios of the reagents (Figure 7). In all systems, the covalent bonding of heterogeneous macromolecules is the result of the same reaction between "anchor" tetrazole and oxirane rings, for which such a dramatic influence of the solvent on the kinetic regularities is not observed (23). Consequently, the most probable cause of higher rates of network paired polymers formation in DCE is the better compatibility of PS and PMMA, which leads to a more pronounced fluctuation network of heterogeneous macromolecular coils in the initial solution.…”

Section: Resultsmentioning

confidence: 99%

Conetworks on the base of polystyrene with poly(methyl methacrylate) paired polymers

et al. 2019

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It is found that forced (reactive) blending of polystyrene (PS) with polymethylmethacrylate (PMMA) involves the covalent binding of heterogeneous macromolecules to afford the paired polymers. For this purpose, the “anchor” N-H unsubstituted tetrazole or oxirane functional groups are preliminarily introduced in the structure of both polymers in a small amount that leads to a covalent binding of the heterogeneous macromolecules. The reaction between the modified PS and PMMA is carried out in dimethylformamide (DMF), toluene and dichloroethane (DCE) at a high total concentration of polymers (10-20 g dL-1). The process is accompanied by gel-formation to deliver cross-linked paired polymers It is established that the highest rate of the paired polymer is attained in the DCE medium, while the lowest rate is observed in DMF. For paired polymers synthesized in DMF, two glass transition temperatures (Tg) of 92°C and 104°C correspond to the original PS and PMMA, respectively. The products of forced blending of PS and PMMA in toluene have one averaged Tg value (99°C), whereas those obtained in DCE show no pronounced glass transition region at 90 ÷ 115°C. In toluene or DCE, the paired polymers are formed, which represent single-phase systems having one glass transition region.

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Section: Resultsmentioning

confidence: 99%