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Formation of polyurethane membranes by immersion precipitation. II. Morphology formation

✍ Scribed by Young Duk Kim; Je Young Kim; Hwan Kwang Lee; Sung Chul Kim

Book ID
101252519
Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
364 KB
Volume
74
Category
Article
ISSN
0021-8995

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✦ Synopsis

Polyurethane membranes were prepared by an immersion precipitation process. The effects of dope concentration, coagulation bath composition, and the chemical structure of the polyurethane on the morphology of the membranes were studied. The degree of contraction was measured by quenching freshly formed polyurethane membranes in liquid nitrogen. A mechanism for the formation of membrane morphology during immersion precipitation is proposed.

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Formation of polyurethane membranes by immersion precipitation. i. liquid–liquid phase separation in a polyurethane/DMF/water system
✍ Young Duk; Kim; Je Young; Kim; Hwan Kwang; Lee; Sung Chul; Kim πŸ“‚ Article πŸ“… 1999 πŸ› John Wiley and Sons 🌐 English βš– 162 KB πŸ‘ 2 views

Liquid-liquid phase separation phenomena of polyurethane/DMF/water were studied. Two polyurethanes having different hydrophobicity were synthesized by varying the polyol components. The cloud-point curves for the ternary system of polyurethane/DMF/water were determined by the titration method. A sma