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Polymeric Membrane Behavior at High Temperatures

Investigating the transport and mechanical behavior of polymeric dense films at elevated temperatures, focusing on poly(methyl methacrylate) membranes. The project aims to understand the effects of temperature, pressure, film thickness, and gas types on membrane performance. This research seeks to address the decline in membrane efficiency over time, particularly at high temperatures, and aims to develop a comprehensive understanding of the relationship between the transport and mechanical properties of polymeric membranes. The project proposal includes experiments to characterize the polymer, conduct transport/compaction tests, and investigate the correlation between various parameters in membrane performance analysis.

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Polymeric Membrane Behavior at High Temperatures

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  1. Mechanical and Transport Behavior of Polymeric Dense Films at Elevated Temperature Anandh Balakrishnan Faculty Advisor: Dr.Alan.R.Greenberg Co-Advisor: Dr.Vivek.P.Khare Dept of Mechanical Engineering, University of Colorado,Boulder

  2. Introduction-Membrane Science • Membrane A structure having lateral dimensions much greater than its thickness, through which mass transfer may occur under a variety of driving forces. (Koros,Ma,Shimidzu-1996) • Membrane types  Knudsen diffusion, molecular sieving, solution diffusion membranes. • Industrial Applications: oxygen production, nitrogen production, hydrocarbons. • Solution diffusion membranes are mostly polymeric owing to cheap costs and ease of fabrication. • Solution diffusion membranes=> Sorb-diffuse-Desorb. • Generic structure of a commercial polymeric solution diffusion membrane. Skin layer (separation takes place here) Porous support (gives support to skin) Project Proposal

  3. Separation governed by the capability of a membrane to discriminate gas sizes and the driving force of each component. Based on Fick’s Law of diffusion, we have where i,j are two components; f and p are indicative of feed and permeate streams;J is the mass flux;K1 the ratio of permeabilities; K2the ratio of partial pressures of i to j; x is the mole fraction of i/j in feed (f) /permeate streams (P). For the transport of a single gas through a membrane, Fick’s law is straightforward where l is the thickness of the membrane. Technical Background Project Proposal

  4. Problem Statement • Polymer membranes exhibit a decline in performance with time, which becomes acute at high temperatures. • Reasons?! Decrease in thickness or compaction manifested as a viscoelastic creep response. • How?! Compaction  decrease in free volume=>decrease in permeabilities. • Previous methods characterize transport and mechanical behavior but measurement is not simultaneous. • Coupled measurement required to understand the co-relation between the two behaviors. Project Proposal

  5. Proposal • Perform experiments on a chosen polymer. • Choice: poly(methyl methacrylate) (PMMA) and a suitable solvent. • Experimental variables pressure, temperature, film thickness, number of gases. • Proposed experimental plan (Thesis plan) a) Characterizing polymer : mechanical response, glass transition b) Conducting Transport/Compaction tests in the permeation cum compaction cell on my decided experimental variables c) Levels of experimentation (to be decided) Project Proposal

  6. Schedule of Activities (Fall 2004-Spring 2005) Completed To be completed Project Proposal

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