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Ripening mechanisms in binary polyme...

Cheng, Mary Hongying.

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Ripening mechanisms in binary polymer blends.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Ripening mechanisms in binary polymer blends./
作者:	Cheng, Mary Hongying.
面頁冊數:	169 p.
附註:	Source: Dissertation Abstracts International, Volume: 63-03, Section: B, page: 1380.
Contained By:	Dissertation Abstracts International63-03B.
標題:	Chemistry, Polymer. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3045375
ISBN:	0493593411

Ripening mechanisms in binary polymer blends.
Cheng, Mary Hongying.

Ripening mechanisms in binary polymer blends. - 169 p.

Source: Dissertation Abstracts International, Volume: 63-03, Section: B, page: 1380.

Thesis (Ph.D.)--Rensselaer Polytechnic Institute, 2002.

Particulate polymer-in-polymer micro-dispersions show a pronounced increase in the size of the dispersed particles during melt-phase annealing. Three ripening mechanisms were investigated in this study: Ostwald ripening, hydrodynamic coarsening and Brownian coalescence. Numerical simulations and experiments were carried out to determine the time evolution of the average particle size and the particle size distribution, as a function of the volume fraction.

ISBN: 0493593411Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Ripening mechanisms in binary polymer blends.
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245 1 0 $a Ripening mechanisms in binary polymer blends.
300 $a 169 p.
500 $a Source: Dissertation Abstracts International, Volume: 63-03, Section: B, page: 1380.
500 $a Adviser: E. Bruce Nauman.
502 $a Thesis (Ph.D.)--Rensselaer Polytechnic Institute, 2002.
520 $a Particulate polymer-in-polymer micro-dispersions show a pronounced increase in the size of the dispersed particles during melt-phase annealing. Three ripening mechanisms were investigated in this study: Ostwald ripening, hydrodynamic coarsening and Brownian coalescence. Numerical simulations and experiments were carried out to determine the time evolution of the average particle size and the particle size distribution, as a function of the volume fraction.
520 $a Numerical simulations of Brownian coalescence show a self-similar cumulative particle size distribution that is not affected by the volume fraction. The modified Cahn-Hilliard equation predicts growth by Ostwald ripening and diffusion-induced coalescence. Simulations of this mechanism also show a self-similar particle size distribution, but the distribution broadens with increasing volume fraction of the minor phase. Domain growth in binary fluids is a complicated phenomenon. Competitive ripening mechanisms may exist simultaneously. Model H, which combines all three ripening mechanisms, was simulated in two-dimensional polymer blends. Numerical simulations based on model H demonstrated that thermal noises had little effect on either the domain growth or the particle size distribution.
520 $a Nonlinear diffusion with concentration driven flows has been shown to play an important role in the development of morphology in both miscible and immiscible systems. Hydrodynamics had a significant effect on an interconnected domain, but it had relatively little effect on a particulate system. Flows induced by concentration gradients hastened ripening but slowed dissolution. This general approach appears useful for a broad class of problems that involve mixing, unmixing, reaction, and phase transformations regardless of miscibility.
520 $a Experimental studies were designed to investigate the relative contribution of bulk diffusion and coalescence for blends of polybutadiene dispersed in polystyrene with different volume fractions. Bulk blends were produced by compositional quenching. Each polymer blend was compression molded for various times to allow particle ripening. TEM analysis of the samples showed that the average domain size followed a power law growth. The ripening exponent was close to 1/3, which was consistent with theoretical predictions by the modified Cahn-Hilliard model and Ostwald ripening. However, the particle size distribution was broader.
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790 $a 0185
791 $a Ph.D.
792 $a 2002
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