Diffusion and solution of gases in substituted polyacetylene membranes

Masuda, Toshio; Iguchi, Yuichiro; Tang, Benzhong; Higashimura, Toshinobu

doi:10.1016/0032-3861(88)90178-4

Cited by 220 publications

(163 citation statements)

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“…As to other two equations (13) and (15), such correlation was absent either between a3 (or a2 ) and d 2 , or between b3 (or b2 ) and d 2 • Having above correlations we can estimate the permeabilities of all the non-swelling gases through a great variety of polymer membranes from gas diameters and the ratios of V,/Ecoh of polymers.…”

Section: Resultsmentioning

confidence: 99%

A Simple Method for Prediction of Gas Permeability of Polymers from Their Molecular Structure

Jia

1991

Polym J

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ABSTRACT:A method for the prediction of gas permeabilities (P) through polymers from their chemical structure has been. developed on the basis of the ratio of molar free volume to molar cohesive energy, Vc!Ecoh• The permeation of small gas molecules through polymer membranes is dependent on the chain packing density measured by V1 and segmental motion of polymer chains measured by Ecoh• But no simple relationship between P and V, or Ecoh alone was found.The permeability data of more than 60 polymers covering 7 orders of magnitude for six gases have been treated with linear regression analysis. All plots of log P vs. Vt-!Ecoh gave good straight lines.lt is also found that a linear relationship holds when plotting both the intercepts and slopes of log P vs. V,/Ecoh lines against square of the diameters of gas molecules.Therefore,the permeabilities of all the non-swelling gases through a great variety of polymers can be estimated using two correlations above, Moreover, this method is more accurate than others in the literature and may found useful for the selection of gas separation or barrier membrane materials.KEY WORDS Polymer Membranes/ Gas Permeability/ Free Volume/ Cohesive Energy/ Gas Separation/ Barrier/ Permeation of small molecules through polymer membranes is very important for many applications, including separation processes, barrier packaging and controlled release devices for medicine and agriculture. It is significant to have a simple method for predicting what chemical strutures will provide permeabilities in the range desired for a particular use,In an attempt to relate the penetrant to the polymer, Lee 1 put forward a prediction technique for gas permeability from polymer structure on the basis of a specific free volume (SFV) diffusive theory, Recently, Salame 2 suggested so called •Permachor• approach to predict gas permeability in polymers and he found that there is a good linear relationship between the logarithm of gas permeability and a polymer structure parameter Permachor ( n ), which can be calculated from both the cohesive energy ~ensity (CED) and fractional free volume (Ve) of the polymer.

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Section: Resultsmentioning

confidence: 99%

A Simple Method for Prediction of Gas Permeability of Polymers from Their Molecular Structure

Jia

1991

Polym J

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“…104 Polyacetylenes with a spherical substituent such as poly(11) generally exhibited large P values. The especially large P values ($2 Â 10 3 -2 Â 10 4 barrers) of poly(11) were found to be based on both its D and S values being large.…”

Section: Functions Of Substituted Polyacetylenesmentioning

confidence: 99%

Substituted polyacetylenes

Masuda

2006

J. Polym. Sci. A Polym. Chem.

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389

222

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This article reviews the chemistry of substituted polyacetylenes developed by our research group, more specifically, development of polymerization catalyst, synthesis of new polymers, elucidation of their structure, investigation of their properties, and development of their functions. The main features are as follows: a number of catalysts based on group 5, 6, and 9 transition metals (Nb, Ta, Mo, W, and Rh) have been developed, which include living polymerization catalysts. By using these catalysts, many new substituted polyacetylenes have been synthesized, whose molecular weights are very high (Mw = 104−106). Most of the polymers are soluble in many common solvents and stable enough in the air unlike polyacetylene. Some of these polymers exhibit interesting functions including high gas permeability and photoelectronic properties. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 165–180, 2007

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“…However, PTMSP (poly [(1-trimethylsilyl)-1-propyne]), a polyacetylene which has a repeating structure of [-(CH 3 )C=C(Si[CH 3 ] 3 )-] x , is a glassy polymer that has been found to have roughly ten-fold higher permeability than PDMS with only somewhat lower selectivity (Masuda, 1983;Takada, 1985;Masuda, 1988;Ichiraku, 1987). Prior to these results, PDMS was found to have the highest permeability of any nonporous polymer.…”

Section: Glassy Polymersmentioning

confidence: 99%

Membrane-Mediated Extraction and Biodegradation of Volatile Organic Compounds From Air

Peretti¹,

Shepherd²,

Clayton³

et al. 2005

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Public reporting burden for the collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to a penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. iii iv ForewordThe U.S. Environmental Protection Agency (EPA) is charged by Congress with protecting the Nation's land, air, and water resources. Under a mandate of national environmental laws, the Agency strives to formulate and implement actions leading to a compatible balance between human activities and the ability of natural systems to support and nurture life. To meet this mandate, EPA's research program is providing data and technical support for solving environmental problems today and building a science knowledge base necessary to manage our ecological resources wisely, understand how pollutants affect our health, and prevent or reduce environmental risks in the future.The National Risk Management Research Laboratory (NRMRL) is the Agency's center for investigation of technological and management approaches for preventing and reducing risks from pollution that threaten human health and the environment. The focus of the Laboratory's research program is on methods and their cost-effectiveness for prevention and control of pollution to air, land, water, and subsurface resources; protection of water quality in public water systems; remediation of contaminated sites, sediments and ground water; prevention and control of indoor air pollution; and restoration of ecosystems. NRMRL collaborates with both public and private sector partners to foster technologies that reduce the cost of compliance and to anticipate emerging problems. NRMRL's research provides solutions to environmental problems by: developing and promoting technologies that protect and improve the environment; advancing scientific and engineering information to support regulatory and policy decisions; and providing the technical support and information transfer to ensure implementation of environmental regulations and strategies at the national, state, and community levels.This publication has been produced as part of the Laboratory's strategic long-term research plan. It is published and made available by EPA's Office of Research and Development to assist the user community and to link researchers with their clients.Sally Gutierrez, Acting Director National Risk Management Research Laboratory v EPA Review NoticeThis report has been peer an...

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Diffusion and solution of gases in substituted polyacetylene membranes

Cited by 220 publications

References 20 publications

A Simple Method for Prediction of Gas Permeability of Polymers from Their Molecular Structure

A Simple Method for Prediction of Gas Permeability of Polymers from Their Molecular Structure

Substituted polyacetylenes

Membrane-Mediated Extraction and Biodegradation of Volatile Organic Compounds From Air

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