Study of the solvent effect on miscibility between poly(vinyl chloride) and poly(methyl methacrylate) in the solution state - viscometric measurements

✍ Scribed by Hong, Po-Da; Huang, Hsing-Tsai; Chou, Che-Min

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 101 KB
• Volume: 49
• Category: Article
• ISSN: 0959-8103
• DOI: 10.1002/(sici)1097-0126(200004)49:4<407::aid-pi394>3.0.co;2-k

✦ Synopsis

In this work, the solvent effect on the miscibility between poly(vinyl chloride) (PVC) and poly(methyl methacrylate) (PMMA) in ternary polymer solutions was examined by the viscometric method. In these systems, we could understand that the used solvents, tetrahydrofuran (THF) or N,Ndimethylformamide (DMF), mainly affect the interaction between PVC and PMMA, while prompting various miscible properties. In PVC/PMMA/THF solution, THF is a near u-solvent and a poor solvent for PVC and PMMA, respectively. The mixing of the tighter PMMA coils and more extended PVC coils in THF may cause the sea±island heterogeneous structure below the weight fraction of PMMA in the polymer mixture w PMMA = 0.7, resulting in immiscible PVC/PMMA mixtures. At w PMMA ! 0.7, the PVC/ PMMA mixtures are relatively miscible, giving homogeneous polymer solutions. It means that the miscibility between PVC and PMMA depends on the composition of polymer mixture. However, due to the similar af®nity of DMF to PVC and PMMA, PVC/PMMA/DMF solutions exhibit high miscibility between PVC and PMMA at about w PMMA = 0.5.