Compositional and temperature dependence of free volume in segmented copolymer PET/PEO studied by positron annihilation lifetime measurement
β Scribed by B Wang; M Zhang; J.M Zhang; C.Q He; Y.Q Dai; S.J Wang; D.Z Ma
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 196 KB
- Volume
- 262
- Category
- Article
- ISSN
- 0375-9601
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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
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