Preparation and solution properties of microhydrogels from poly(vinyl alcohol)

✍ Scribed by Uwe Brasch; Walther Burchard

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 548 KB
• Volume: 197
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.1996.021970117

✦ Synopsis

Microgels were synthesized by intramolecular crosslinking of poly(viny1 alcohol) single chains with glutaraldehyde in dilute aqueous solutions (concentration c = 0,l g/100 mL). The degree of crosslinking was vaned from X = 0 to X = 150 (Xis the number of crosslinker molecules per chain). The reaction products were characterized by static and dynamic light scattering and viscosity measurements. A clear shrinking of molecular dimensions could be observed with increasing degree of crosslinking, since the radius of gyration R,, and with that, the p-parameter (p = R,/R,) decrease with the number of intramolecular crosslinks. A similar behavior is seen from viscosity measurements. The intrinsic viscosity [q] decreases with increasing X-parameter and depends only very weakly on the temperature which is an indication of a loss in flexibility and therefore for a relatively fixed structure.