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• W2322798911 abstract "A glass transition temperature, Tg, and a β relaxation temperature, Tβ, of spin-labeled polystyrene (PS) having a number average molecular weight (Mn) of ca. 25 kDa were determined by the microwave power saturation (MPS) method of electron spin resonance (ESR). Spin labeling was selectively carried out at chain ends or midchain segments. This method allowed us to determine the local Tg and the local Tβ around the spin-labeled sites, selectively. The Tg determined by the ESR, Tg,ESR, was in good agreement with that determined by differential scanning calorimetry, Tg,DSC; the Tg,ESR decreased with decreasing Mn with blending oligomers as well as the Tg,DSC. The Tg,ESR for the end-labeled PS (PS-E) was equal to that for the midchain-labeled PS (PS-M) irrespective of the Mn. However, we previously reported that the PS-E showed distinctly higher segmental mobility than the PS-M in the temperature range 423–463 K (above Tg). Therefore, we conclude that the chain ends intrinsically have higher segmental mobility than midchain segments due to the discontinuity of repeat units; however, the mobilities of chain ends and midchain segments are averaged out in the vicinity of Tg due to the cooperativities with neighboring numerous chain segments. Concerning the β relaxation, the Tβ determined by the MPS was in good agreement with those determined by dielectric and dynamic mechanical spectroscopies and dilatometry. The Tβ of the PS-E was the same with that of the PS-M within experimental uncertainties; the Tβ was insensitive to the Mn in contrast to the Tg. Therefore, we conclude that the effect of chain end is little on the β relaxation of PS due to its local character. In addition, the effect of annealing at 353 K was found to be the same for the Tβs of the PS-E and PS-M." @default.
• W2322798911 created "2016-06-24" @default.
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• W2322798911 date "2012-01-23" @default.
• W2322798911 modified "2023-09-26" @default.
• W2322798911 title "Glass Transition Temperature and β Relaxation Temperature around Chain End of Polystyrene Determined by Site Specific Spin Labeling" @default.
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• W2322798911 doi "https://doi.org/10.1021/jp210630m" @default.
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