Addition-type polynorbornene with Si(CH3)3 side groups: Detailed study of gas permeation and thermodynamic propertiesстатья

Статья опубликована в высокорейтинговом журнале

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Дата последнего поиска статьи во внешних источниках: 5 июня 2017 г.

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[1] Addition-type polynorbornene with si(ch3)3 side groups: Detailed study of gas permeation and thermodynamic properties / L. Starannikova, M. Pilipenko, N. Belov et al. // Journal of Membrane Science. — 2008. — Vol. 323. — P. 134–143. Polymerization of nonrbornene bearing Si(CH3)3 groups in the five position with the opening of double bonds was performed. By accurate selection of the ratios catalyst/co-catalyst and monomer/catalyst the samples with increased molecular mass (about 400000) were obtained. Transport parameters of this, addition type poly(trimethylsilyl norbornene) (PTMSN) were measured using the gas chromatographic and spectrometric methods for different gases (H2, He, O2, N2, CO2, CH4, C2H6, C3H8 and n-C4H10).Teperature dependence of the permeability coefficients (P) indicated that low activation energies of permeation (Ep) and diffusion (Ed) are characteristic for PTMSN. In some cases (CO2, C2H6) negativ Ep values were observed. Thermodynamics of vapor sorption in this polymer was studied using the inverse gas chromatography method. It was shown that PTMSN is characterized by very large solubility coefficients S similar to those of poly(trimethylsilyl propyne) (PTMSP). The comparison of the P,D and S values of these highly permeable polymers showed that the greater permeability of PTNSP is determined by the larger D values. Application of different approaches for the determination of the size of microcavities in PTMSN indicated that this polymer is characterized by large size of microcavity (800- 1200 A). [ DOI ]

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