Macrochain configuration, stucture of free volume and transport properties of poly(1-trimethylsilyl-1-propyne) and poly(1-trimethylgermyl-1-propyne)

被引：12
作者：
Matson, S. M. [1 ]
Raetzke, K. [2 ]
Shaikh, M. Q. [2 ]
Litvinova, E. G. [1 ]
Shishatskiy, S. M. [3 ]
Peinemann, K. -V. [4 ]
Khotimskiy, V. S. [1 ]
机构：
[1] Russian Acad Sci, AV Topchiev Petrochem Synth Inst, Moscow 119991, Russia
[2] Univ Kiel, Tech Fac, D-24143 Kiel, Germany
[3] Helmholtz Zentrum Geesthacht, Polymer Res Inst, D-21502 Geesthacht, Germany
[4] King Abdullah Univ Sci & Technol, Adv Membranes & Porous Mat Ctr, Thuwal 239556900, Saudi Arabia
来源：
POLYMER SCIENCE SERIES A | 2012年 / 54卷 / 08期
基金：
俄罗斯基础研究基金会;
关键词：
POSITRON-ANNIHILATION LIFETIME; TEMPERATURE-DEPENDENCE; GAS-PERMEABILITY; POLYMERS; NANOCOMPOSITE; PERMEATION; SORPTION;
D O I：
10.1134/S0965545X1207005X
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
The relationship between poly(1-trimethylsilyl-1-propyne) (PTMSP) and poly(1-trimethylgermyl-1-propyne) (PTMGP) microstructure, gas permeability and structure of free volume is reported. n-Butane/methane mixed-gas permeation properties of PTMSP and PTMGP membranes with different cis-/trans-composition have been investigated. The n-butane/methane selectivities for mixed gas are by an order higher than the selectivities calculated from pure gas measurements (the mixed-gas n-butane/methane selectivities are 20-40 for PTMSP and 22-35 for PTMGP). Gas permeability and n-butane/methane selectivity essentially differ in polymers with different cis-/trans-composition. Positron annihilation lifetime spectroscopy investigation of PTMSP and PTMGP with different microstructure has determined distinctions in total amount and structure of free volume, i.e. distribution of free volume elements. The correlation between total amount of free volume and gas transport parameters is established: PTMSP and PTMGP with bigger free volume exhibit higher n-butane permeability and mixed-gas n-butane/methane selectivity. Such behavior is discussed in relation to the submolecular structure of polymers with different microstructure and sorption of n-butane in polymers with different free volume.
引用
收藏
页码：671 / 677
页数：7
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