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  • Author or Editor: Liu Zhenhai x
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Abstract  

In the paper existence results for degenerate quasilinear parabolic initial boundary value problems of higher order are proved. The weak solution is sought in a suitable weighted Sobolev space using the generalized degree theory.

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In this paper we deal with elliptic systems with discontinuous nonlinearities. The discontinuous nonlinearities are assumed to satisfy quasimonotone conditions. We shall use the method of upper and lower solutions with fixed point theorems on increasing operators in ordered Banach spaces to show some existence theorems.

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Abstract

This paper is devoted to anti-periodic solutions for a class of implicit differential equations with nonmonotone perturbations. The main tools in our study will be the maximal monotone property of the derivative operator with anti-periodic conditions and a convergent approximation procedure.

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Abstract  

We deal with the existence of solutions for double degenerate quasilinear parabolic equations which can degenerate, on a part of the boundary, on a segment in the interior of the domain and in time.

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Abstract  

The present report deals with some results on phase behavior, miscibility and phase separation for several polymer blends casting from solutions. These blends are grouped as the amorphous polymer blends, blends containing a crystalline polymer or two crystalline polymers. The blends of PMMA/PVAc were miscible and underwent phase separation at elevated temperature, exhibited LCST behavior. The benzoylated PPO has both UCST and LCST nature. For the systems composed of crystalline polymer poly(ethylene oxide) and amorphous polyurethane, of two crystalline polymers poly(-caprolactone) and poly[3,3,-bis-(chloromethyl) oxetane], appear a single T g, indicating these blends are miscible. The interaction parameter B's were determined to be –14 J cm–3, –15 J cm–3 respectively. Phase separation of phenolphthalein poly(ether ether sulfone)/PEO blends were discussed in terms of thermal properties, such as their melting and crystallization behavior.

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