Miscibility of bromobenzylated poly(2,6-dimethyl-1,4-phenylene oxide) with polystyrene

✍ Scribed by S.H. Goh; S.Y. Lee

• Publisher: Elsevier Science
• Year: 1988
• Tongue: English
• Weight: 281 KB
• Volume: 24
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(88)90171-1

✦ Synopsis

The methyl groups of poly(2,6-dimethyl-l,4-phenylene oxide) (PPO) were brominated to various extents. Bromobenzylated PPO (BrPPO) samples with degrees of bromination of 16, 37, 50, 69 and 76% were found to be miscible with polystyrene (PS) but BrPPO with a degree of bomination of 92% was immiscible with PS. The Tg-composition curves of the 5 miscible blend systems can be described by the Gordon-Taylor equation. The Gordon-Taylor k parameter of a PS/BrPPO blend decreases with increasing degree of bromination of BrPPO. The results indicate that the intensity of PS-BrPPO interaction decreases with increasing bromine content of BrPPO. Phase separation of some of the miscible blends could be induced by heating. The variation of cloud points of these blends is consistent with the variation of Gordon-Taylor k parameters. BrPPO with degrees of bromination of 16 and 37% were judged to be miscible with PPO, based on the optical clarity of the blends. The results were used to calculate two segmental interaction parameters.