A novel method for measuring local permeabilities of gas or vapor in polymers was proposed and developed. The method utilizes a thin reactive layer of potassium prepared on one side of the examined polymer film. Molecules of an appropriate gas (oxygen, water vapor) diffusing through the film corrode the reactive...
Studies on the possibility of using of polysulfone as a coating for water soluble NPK granular fertilizer were performed. The coatings were formed from the polymer solutions by the phase inversion technique. As the polysulfone coatings are not biodegradable, the starch was added to facilitate the destruction of the polymeric...
The synthesis of new copolysiloxane-imide polymers was carried out from a, w-dimethylsiloxane oligomers and aromatic di-anhydrides (PMDA and 6FDA) to obtain soluble siloxane-imide based polymers PSI endowed both with organophile properties and good physical membrane properties. Synthesized PSI block copolymers had high weight contents of siloxane residue varying from 70...
In this work a study of asymmetric polymeric membranes synthesis was made for color and turbidity removal of an industrial textile effluent, which was previously treated by a biological treatment. A 23 factorial planning was carried out using two levels (- and +), together with the factors: polymer type (polysulfone...
This paper converses on a gas foaming polymer processing approach that allows the fabrication of three-dimensional porous matrices from bio-absorbable materials (e.g., copolymers of lactide and glycolide [PLG]) without the use of organic solvents or high temperatures. The effects of several processing parameters (e.g., gas type, polymer composition and molecular...
Wichita, Kan. -- Invista chairman Jeff Gentry has assumed the additional role of ceo following the resignation of Jeff Walker as president, ceo and as a director of the company. Walker will leave the company May 31. Invista, owned by Koch Industries and built...
Articles 2007-05-21
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