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Mechanical and Transport Behavior of Polymeric Dense Films at Elevated Temperature

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. Introduction-Membrane Science. Membrane

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Mechanical and Transport Behavior of Polymeric Dense Films at Elevated Temperature

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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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