Phase separation in poly(vinyl alcohol)/gelatin blend systems

✍ Scribed by Tanaka, Toshihisa; Ohnishi, Saori; Yamaura, Kazuo

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 202 KB
• Volume: 48
• Category: Article
• ISSN: 0959-8103
• DOI: 10.1002/(sici)1097-0126(199909)48:9<811::aid-pi221>3.0.co;2-v

✦ Synopsis

Blends of a commercial poly(vinyl alcohol) (a-PVA) derived from vinyl acetate and gelatin obtained from collagen were prepared by mixing aqueous solutions of both samples under various conditions. For the blend hydrogels, the depression of melting temperatures was observed at high PVA content. Similarly to the a-PVA/silk ®broin (SF) system, when the degrees of polymerization of PVA increased, the microphase separation region in a phase diagram of the blend ®lms increased for the a-PVA/gelatin system. In the IR spectra of the blend ®lms, no absorption bands corresponding to a conformational change of gelatin appeared. Comparison of the mechanical properties of the a-PVA/ gelatin and a-PVA/SF systems, showed the interaction between PVA and gelatin molecules to be smaller than that between PVA and SF molecules.