Phase separation in a polymer blend in the course of interchain exchange reactionстатья

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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.

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[1] Govorun E. N., Kudryavtsev Y. V. Phase separation in a polymer blend in the course of interchain exchange reaction // Polymer Science - Series A. — 2004. — Vol. 46, no. 5. — P. 553–564. The competition of spinodal decomposition and interchain exchange reaction in a melt of a Markov multiblock AB copolymer is theoretically studied. The stability region of the homogeneous system state is determined depending on the blockiness parameter, which changes in the course of the reaction. Within the random phase approximation, equations for the structural factor are derived; they describe the linear stage of the spinodal decomposition. The compatibilizing effect of the exchange reaction is studied via numerical solution of these equations. The region of unstable fluctuations is found to be narrowed during the reaction as (const − t)^1/2, whereas the characteristic inhomogeneity size increases as ∼ exp(const t). As is shown, the polydispersity of the chain length significantly delays phase separation in the polymer blend even in the absence of a chemical reaction.

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