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Entanglement fluctuation during phase separation in polymer blends
Author(s) -
Xie Rui,
Liang Haojun,
Yang Bingxin,
Jiang Bingzheng,
Zhang Qizhong,
Xu Yuanze
Publication year - 1993
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1993.070500811
Subject(s) - spinodal decomposition , isothermal process , materials science , phase (matter) , dynamic mechanical analysis , rheology , polymer , miscibility , vinyl acetate , dynamic modulus , copolymer , thermodynamics , modulus , polymer chemistry , chemistry , composite material , organic chemistry , physics
For perhaps the first time, the dynamics of liquid‐liquid phase separation was studied by time‐resolved mechanical spectrometry in order to establish the relationship between blends' properties and the phase structures during spinodal decomposition (SD). The selected system was chlorinated polyethylene (CPE)/ethylene‐vinyl acetate copolymer (EVA). It was found that in the early and intermediate stage of SD, the storage modulus ( G ′) and the loss modulus ( G ″) increase with time after the initiation of the isothermal phase separation; in the later stage, G ′ and G ″ decrease as phase separation proceeds. An entanglement fluctuation model was presented to manifest this phenomenon; it was found that the rheological behavior agrees well with the expections of the model in the early stage. For the later stage, the reduction of G ′ and G ″ can be attributed to the increment of phase‐domain size. © 1993 John Wiley & Sons, Inc.