1H NMR Cryoporosimetry of Swollen Hypercrosslinked Polymers

被引：3

作者：

Babushkina, T. A. ^{[1
]}

Klimova, T. P. ^{[1
]}

Davankov, V. A. ^{[1
]}

Tsyurupa, M. P. ^{[1
]}

Pastukhov, A. V. ^{[1
]}

Blinnikova, Z. K. ^{[1
]}

机构：

[1] Russian Acad Sci, AN Nesmeyanov Organoelement Cpds Inst, Moscow 119991, Russia

来源：

RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A | 2010年 / 84卷 / 03期

关键词：

WATER; POLYSTYRENE;

D O I：

10.1134/S0036024410030192

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The porous structure of two laboratory samples of hypercrosslinked polystyrene networks with a crosslinking degree of 200%, the commercial hypercrosslinked sorbent MN-270 (Purolite Int.), and macroporous polystyrene sorbents Amberlite XAD-4 and Amberlite XAD-1600 were investigated by means of H-1 NMR cryoporosimetry. It was determined that the signal intensity of benzol, dioxane, dichloroethane and water protons previously frozen in polymer pores increases during solvent melt. Dependencies of the integral proton signal intensities on the sample temperature obtained in various solvents are discussed in terms of sample micropore accessibility and solvent-polystyrene interaction energy. Pore dimensions are estimated using the melting temperature value of ice according to the Gibbs-Thomson equation. We conclude that the obtained distribution curves reveal all hypercrosslinked polymers to be mainly microporous with diameter distribution maxima around 10 angstrom. It is shown that along with pores 120 angstrom in diameter, XAD-4 has a considerable amount of micropores. In contrast, XAD-1600 is ranged as a mesoporous sorbent.

引用

页码：460 / 465

页数：6

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