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Positron annihilation and differential scanning calorimetry investigations in poly(methylmethacrylate)/low molecular weight poly(ethylene oxide) polymer blends

✍ Scribed by J. C. Machado; G. Goulart Silva; L. S. Soares

Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 155 KB
Volume: 38
Category: Article
ISSN: 0887-6266
DOI: 10.1002/(sici)1099-0488(20000415)38:8<1045::aid-polb5>3.0.co;2-n

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✦ Synopsis

Positron annihilation lifetime spectroscopy (PALS) and differential scanning calorimetry (DSC) measurements were performed in atactic poly(methylmethacrylate) and low molecular weight poly(ethylene oxide) (PEO) polymer blends, prepared by codissolution in acetonitrile, covering the full range of composition. Results from the two techniques indicate that a "window of miscibility" is attained at around 20 -30 wt % of the semicrystalline PEO.

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Positron lifetime measurements were carried out in a series of poly(ethylene oxide)-PEO-of different average molecular weights (M w ): 1000, 1500, 6000, 10,000, 300,000, and 4 M. The mean radius (R ) and the mean free volume size (V f ) values were determined using a semiempirical equation that corr