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  • Users: masuk
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  1. masuk

    etching polymer surface

    Hello everyone, Greetings! I would appreciate any guide about etchant for modifying polymer film surface. I like to modify surface roughness (random) of poly(vinyl alcohol) films. I was wondering if there is any wet(chemicals like strong acid or base) or dry (plasma or ion beam) etching...
  2. masuk

    UNIQUAC parameters for ethylene glycol-water mixture at different temp

    Dear colleagues, I got few questions and would appreciate your reply For the UNIQUAC model Water parmeters (1): r= 0.92 and q = 1.14, q'=1.4 ethylene glycol parmeters (2) r = 2.4088 and q = 2.2488, q'=0.4761 (could anybody confirm?) I need to find the the binary parmeters (a12 and a21) at...
  3. masuk

    Surface energy vs surface free energy of Polymer

    What is the difference between surface energy and surface free energy, in terms of physics? I found surface energy of a solid sometimes refers to the surface tension and they have equivalent units. However, I am confused about surface free energy....any help would be appreciated. Thanks.
  4. masuk

    What does sorption means in pervaporation

    I am little confused about sorption process in pervaporation. Is "Sorption= Adsorption + Absorption" ? In dehydration process, if water molecules attach to the surface by adsorption then how they enter the polymer matrix or network (by absorption or solutbility effect)? Also what is the...
  5. masuk

    commercial PVA membrane

    I am looking for commercial Polyvinyl Alcohol (PVA) membranes only for my research. Can you help me to find any company where I can get/buy it. I've talked with some companies (e.g. VWR, Sulzer, Koch etc) but they are interested in selling whole separation unit and not the membranes only.

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