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Kinetics of microphase separation in...

Glotzer, Sharon C.

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Kinetics of microphase separation in polymer systems: Theory and computer simulation.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Kinetics of microphase separation in polymer systems: Theory and computer simulation./
作者:	Glotzer, Sharon C.
面頁冊數:	129 p.
附註:	Source: Dissertation Abstracts International, Volume: 53-12, Section: B, page: 6344.
Contained By:	Dissertation Abstracts International53-12B.
標題:	Physics, General. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9312853

Kinetics of microphase separation in polymer systems: Theory and computer simulation.
Glotzer, Sharon C.

Kinetics of microphase separation in polymer systems: Theory and computer simulation. - 129 p.

Source: Dissertation Abstracts International, Volume: 53-12, Section: B, page: 6344.

Thesis (Ph.D.)--Boston University, 1993.

Many experiments have recently focused on the scientifically interesting and industrially important phenomenon of "microphase" separation in such systems as gelatin and atactic polystyrene in poor solvents, chemically-crosslinked homopolymer/copolymer mixtures, and multiblock copolymers in selective solvents. A common feature of all of these systems is the existence of competing interactions that dramatically change the kinetics of phase separation from the usual kinetics of spinodal decomposition observed in, e.g., binary fluids or homopolymer solutions. In phase-separating polymer solutions in which spinodal decomposition and gelation occur simultaneously, competition arises naturally due to the different interaction energies present in the system. In particular, a recent experiment showed that this competition produces a "pinning" of the phase-separating mixture.Subjects--Topical Terms:

1018488
Physics, General.

Kinetics of microphase separation in polymer systems: Theory and computer simulation.
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245 1 0 $a Kinetics of microphase separation in polymer systems: Theory and computer simulation.
300 $a 129 p.
500 $a Source: Dissertation Abstracts International, Volume: 53-12, Section: B, page: 6344.
500 $a Major Professor: H. Eugene Stanley.
502 $a Thesis (Ph.D.)--Boston University, 1993.
520 $a Many experiments have recently focused on the scientifically interesting and industrially important phenomenon of "microphase" separation in such systems as gelatin and atactic polystyrene in poor solvents, chemically-crosslinked homopolymer/copolymer mixtures, and multiblock copolymers in selective solvents. A common feature of all of these systems is the existence of competing interactions that dramatically change the kinetics of phase separation from the usual kinetics of spinodal decomposition observed in, e.g., binary fluids or homopolymer solutions. In phase-separating polymer solutions in which spinodal decomposition and gelation occur simultaneously, competition arises naturally due to the different interaction energies present in the system. In particular, a recent experiment showed that this competition produces a "pinning" of the phase-separating mixture.
520 $a In an effort to elucidate the effect of competing interactions on the kinetics of spinodal decomposition in such systems, a microscopic model containing two disparate energies is proposed, and results of Monte Carlo computer simulations are presented to show that this model exhibits many of the important features observed in experiments, particularly the phenomenon of pinning during phase separation. A scaling theory is proposed to explain certain power-law behavior associated with the pinning, and is shown to be consistent with the usual scaling theory of ordinary spinodal decomposition. A preliminary theory is developed for the pinning mechanism, providing a framework in which to understand the effect of the competing interaction energies and allowing the accurate prediction of the pinning exponents observed in the simulations. Finally, Monte Carlo simulation results of microphase separation in diblock and multiblock copolymers are presented, and the phenomenon of network formation is discussed. In this context, the applicability of models of multiblock copolymers to physical gels is examined.
590 $a School code: 0017.
650 4 $a Physics, General. $3 1018488
650 4 $a Chemistry, Polymer. $3 1018428
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791 $a Ph.D.
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