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Morphology of ternary polymer blends...

Chun, Seung Bum.

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Morphology of ternary polymer blends containing a block copolymer as compatibilizing agent.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Morphology of ternary polymer blends containing a block copolymer as compatibilizing agent./
Author:	Chun, Seung Bum.
Description:	169 p.
Notes:	Source: Dissertation Abstracts International, Volume: 60-11, Section: B, page: 5545.
Contained By:	Dissertation Abstracts International60-11B.
Subject:	Chemistry, Polymer. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9951007
ISBN:	0599533617

Morphology of ternary polymer blends containing a block copolymer as compatibilizing agent.
Chun, Seung Bum.

Morphology of ternary polymer blends containing a block copolymer as compatibilizing agent. - 169 p.

Source: Dissertation Abstracts International, Volume: 60-11, Section: B, page: 5545.

Thesis (Ph.D.)--The University of Akron, 1999.

The important role that the order-disorder transition temperature (T ODT) of a block copolymer plays in the effective compatibilization of two immiscible homopolymers was demonstrated, using model ternary blend systems consisting of a diblock copolymer and two immiscible homopolymers. A variety of ternary blend systems, including the most general A/B/(C-<italic>block </italic>-D) ternary blends, in which each component has different chemical structures, were prepared by melt blending or solution blending. For the study, diblock copolymers were synthesized, via anionic polymerization, and have the TODTs. These were determined by oscillatory shear rheometry, at temperature below thermal degradation temperature. The morphology of ternary blends containing a diblock copolymer was investigated using transmission electron microscopy (TEM). In order to determine the interaction parameters (χ) for homopolymer pairs, cloud points of low-molecular-weight homopolymer mixtures were measured by laser light scattering. Non-linear regression analyses of the cloud points were performed with the aide of the Flory-Huggins theory. The interaction parameters determined as a function of temperature and blend composition were used to interpret the morphology of ternary blends. It was found that the miscibility (or the interaction parameter) between a homopolymer and a block of copolymer plays a decisive role in controlling the morphology at the interface between two immiscible homopolymers. It was observed that a diblock copolymer was distributed very poorly at the interface between two immiscible homopolymers when a ternary blend was melt-blended at a temperature below the TODT of the block copolymer or annealed at a temperature below the TODT of a rapidly precipitated blend specimen. It was demonstrated that a C-<italic>block</italic>-D copolymer functioned as a compatibilizing agent for the immiscible A/B binary blend, when block C and homopolymer A, and block D and homopolymer B, respectively, have attractive interactions (χAC < 0 and χBD < 0) although block C and homopolymer B, and block D and homopolymer A, respectively, have repulsive interactions (χBC > 0 and χAD > 0). It was concluded that, independent of the blending method employed, the TODT of a block copolymer should be below the intended melt blending temperature or annealing temperature for effective compatibilization of two immiscible polymers.

ISBN: 0599533617Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Morphology of ternary polymer blends containing a block copolymer as compatibilizing agent.
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245 1 0 $a Morphology of ternary polymer blends containing a block copolymer as compatibilizing agent.
300 $a 169 p.
500 $a Source: Dissertation Abstracts International, Volume: 60-11, Section: B, page: 5545.
500 $a Adviser: Chang Dae Han.
502 $a Thesis (Ph.D.)--The University of Akron, 1999.
520 $a The important role that the order-disorder transition temperature (T ODT) of a block copolymer plays in the effective compatibilization of two immiscible homopolymers was demonstrated, using model ternary blend systems consisting of a diblock copolymer and two immiscible homopolymers. A variety of ternary blend systems, including the most general A/B/(C-<italic>block </italic>-D) ternary blends, in which each component has different chemical structures, were prepared by melt blending or solution blending. For the study, diblock copolymers were synthesized, via anionic polymerization, and have the TODTs. These were determined by oscillatory shear rheometry, at temperature below thermal degradation temperature. The morphology of ternary blends containing a diblock copolymer was investigated using transmission electron microscopy (TEM). In order to determine the interaction parameters (χ) for homopolymer pairs, cloud points of low-molecular-weight homopolymer mixtures were measured by laser light scattering. Non-linear regression analyses of the cloud points were performed with the aide of the Flory-Huggins theory. The interaction parameters determined as a function of temperature and blend composition were used to interpret the morphology of ternary blends. It was found that the miscibility (or the interaction parameter) between a homopolymer and a block of copolymer plays a decisive role in controlling the morphology at the interface between two immiscible homopolymers. It was observed that a diblock copolymer was distributed very poorly at the interface between two immiscible homopolymers when a ternary blend was melt-blended at a temperature below the TODT of the block copolymer or annealed at a temperature below the TODT of a rapidly precipitated blend specimen. It was demonstrated that a C-<italic>block</italic>-D copolymer functioned as a compatibilizing agent for the immiscible A/B binary blend, when block C and homopolymer A, and block D and homopolymer B, respectively, have attractive interactions (χAC < 0 and χBD < 0) although block C and homopolymer B, and block D and homopolymer A, respectively, have repulsive interactions (χBC > 0 and χAD > 0). It was concluded that, independent of the blending method employed, the TODT of a block copolymer should be below the intended melt blending temperature or annealing temperature for effective compatibilization of two immiscible polymers.
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710 2 0 $a The University of Akron. $3 1018399
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