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Molecular relaxation in the blends of polystyrene/poly(2,6-dimethyl-1,4-phenylene oxide) at low temperature

✍ Scribed by Jaeyoung Ko; Youngsoo Park; Soonja Choe

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
186 KB
Volume
36
Category
Article
ISSN
0887-6266

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✦ Synopsis

Molecular relaxation behavior in terms of the a, b, and g transitions of miscible PS/PPO blends has been studied by means of DMTA and preliminary work has been carried out using DSC. From DSC and DMTA (by tan d), the observed a relaxation ( T a or T g ) of PS, PPO, and the blends, which are intermediate between the constituents, are in good agreement with earlier reports by others. In addition, the b transition (T b ) of PS at 0.03 Hz and 1 Hz is observed at 030 and 20ЊC, respectively, while the g relaxation ( T g ) is not observed at either frequency. The T b of PPO is 30ЊC at 0.03 Hz and is not observed at 1 Hz, while the T g is 085ЊC at 0.03 Hz and 070ЊC at 1 Hz. On the other hand, blend composition-independent b or g relaxation observed in the blends may be a consequence of the absence of intra-or intermolecular interaction between the constituents at low temperature. Thus it is suggested that at low temperature, the b relaxation of PS be influenced solely by the local motion of the phenylene ring, and that the b or g relaxation of PPO be predominated by the local cooperative motions of several monomer units or the rotational motion of the methyl group in PPO.

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