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Title: Predictive simulation of non-steady-state transport of gases through rubbery polymer membranes

In this paper, a multiscale, physically-based, reaction-diffusion kinetics model is developed for non-steady-state transport of simple gases through a rubbery polymer. Experimental data from the literature, new measurements of non-steady-state permeation and a molecular dynamics simulation of a gas-polymer sticking probability for a typical system are used to construct and validate the model framework. Using no adjustable parameters, the model successfully reproduces time-dependent experimental data for two distinct systems: (1) O 2 quenching of a phosphorescent dye embedded in poly(n-butyl(amino) thionylphosphazene), and (2) O 2, N 2, CH 4 and CO 2 transport through poly(dimethyl siloxane). The calculations show that in the pre-steady-state regime, permeation is only correctly described if the sorbed gas concentration in the polymer is dynamically determined by the rise in pressure. Finally, the framework is used to predict selectivity targets for two applications involving rubbery membranes: CO 2 capture from air and blocking of methane cross-over in an aged solar fuels device.
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [3] ; ORCiD logo [4] ; ORCiD logo [1]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Joint Center for Artificial Photosynthesis. Chemical Sciences Division
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Energy Storage and Distributed Resources Division; Univ. of California, Berkeley, CA (United States). Dept. of Chemical and Biomolecular Engineering
  3. California Inst. of Technology (CalTech), Pasadena, CA (United States). Materials and Process Simulation Center (MSC). Beckman Inst.
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Joint Center for Artificial Photosynthesis. Energy Storage and Distributed Resources Division
Publication Date:
Grant/Contract Number:
AC02-05CH11231; SC0004993; DGE 1106400; 07.23.CS.15
Type:
Accepted Manuscript
Journal Name:
Polymer
Additional Journal Information:
Journal Volume: 134; Journal ID: ISSN 0032-3861
Publisher:
Elsevier
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); California Inst. of Technology (CalTech), Pasadena, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF); Bosch Energy Research Network
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; rubbery polymers; reaction-diffusion modeling; gas transport
OSTI Identifier:
1459399