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Morphology and phase behavior of pol...

Balijepalli, Suidhakar.

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Morphology and phase behavior of poly(ethylene oxide) blends: Crystallization from melt.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Morphology and phase behavior of poly(ethylene oxide) blends: Crystallization from melt./
作者:	Balijepalli, Suidhakar.
面頁冊數:	197 p.
附註:	Source: Dissertation Abstracts International, Volume: 58-02, Section: B, page: 0728.
Contained By:	Dissertation Abstracts International58-02B.
標題:	Chemistry, Polymer. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9722688
ISBN:	0591315068

Morphology and phase behavior of poly(ethylene oxide) blends: Crystallization from melt.
Balijepalli, Suidhakar.

Morphology and phase behavior of poly(ethylene oxide) blends: Crystallization from melt. - 197 p.

Source: Dissertation Abstracts International, Volume: 58-02, Section: B, page: 0728.

Thesis (Ph.D.)--University of Delaware, 1997.

Crystallization in blends of high and low molecular weight poly(ethylene oxide) has been carried out to study the phase behavior and pattern formation. At low crystallization temperatures (

ISBN: 0591315068Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Morphology and phase behavior of poly(ethylene oxide) blends: Crystallization from melt.
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245 1 0 $a Morphology and phase behavior of poly(ethylene oxide) blends: Crystallization from melt.
300 $a 197 p.
500 $a Source: Dissertation Abstracts International, Volume: 58-02, Section: B, page: 0728.
500 $a Adviser: Jerold M. Schultz.
502 $a Thesis (Ph.D.)--University of Delaware, 1997.
520 $a Crystallization in blends of high and low molecular weight poly(ethylene oxide) has been carried out to study the phase behavior and pattern formation. At low crystallization temperatures ( $\ leq 42\sp\circ C $) , both components cocrystallize into a common crystal lattice. At higher temperatures of crystallization ( $\ geq 45\sp\circ C $) , a defective cocrystal of both the components is formed which dynamically splits into its components. The crystal transformation occurs by the thinning of low molecular weight chains, excluding defects to the crystal surface, and a thickening of high molecular weight chains. The transformation leads to phase segregated growth of the components and the final morphology achieved is 'eutectic-like' with the growth of adjacent phases of the high and low molecular weight fractions.
520 $a The mechanism of cocrystallization and dynamic phase separation are investigated with time resolved small-angle X-ray scattering along with complementary studies by calorimetry, optical and atomic force microscopy.
520 $a Segregation of phases results in the formation of distinct microstructures. The high molecular weight fraction crystallizes as bundles of lamellar crystals and the low molecular weight fraction crystallizes in-between the bundles as stacks of platelets. The formation of the bundles is modeled as the breakdown of a compact sphere under diffusion limitations of the low molecular weight component. A stability analysis provides an estimate for the bundle sizes observed in the blends. The experimental values compare favorably with the predictions of the theory. The evolution of two phases in an eutectic manner is modeled as a diffusion couple. Theoretical predictions of eutectic growth, namely bundle growth velocity and spacing between the phases match reasonably well with experimentally measured quantities.
590 $a School code: 0060.
650 4 $a Chemistry, Polymer. $3 1018428
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Plastics Technology. $3 1023683
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710 2 0 $a University of Delaware. $3 1017826
773 0 $t Dissertation Abstracts International $g 58-02B.
790 1 0 $a Schultz, Jerold M., $e advisor
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791 $a Ph.D.
792 $a 1997
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