Microwave dielectric relaxation in binary mixtures of poly(ethylene glycols) in solution

✍ Scribed by Sengwa, R. J.

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 166 KB
• Volume: 45
• Category: Article
• ISSN: 0959-8103
• DOI: 10.1002/(sici)1097-0126(199802)45:2<202::aid-pi903>3.0.co;2-b

✦ Synopsis

The average relaxation time relaxation times corresponding to seg-q 0 , mental motion and group rotations of a series of binary mixtures of q 1 q 2 , poly(ethylene glycols) (PEG 200 ] PEG 300, PEG 400 ] PEG 600, PEG 1500 ] PEG 4000, PEG 6000 ] PEG 9000, PEG 200 ] PEG 1500, PEG 300 ] PEG 4000, PEG 400 ] PEG 6000 and PEG 600 ] PEG 9000) have been carried out in dilute solutions of benzene and carbon tetrachloride at 9É83 GHz. The e †ect on chain Ñexibility due to inter-and intra-molecular association in these binary mixtures is discussed by comparing relaxation times of these mixtures with their individual relaxation times in solution. It is inferred that the extent of hydrogen bonding in di †erent binary mixtures is not similar and is inÑuenced by solvent environment, but there is correlation between and q 0 q 1 values in all these binary mixtures, which may be because of hydrogen bonding. The observed values in all these mixtures suggests that the chain-ends remain q 2 excluded from the intermolecular association and is independent of the q 2 polymer constituents of the mixture and solvent. It is also equal to the values q 2 of the individual polymers.

1998 SCI.