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Miscibility and physical properties ...

Schroeder, John Robert.

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Miscibility and physical properties for selected crystalline/amorphous polymer blends and block copolymers.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Miscibility and physical properties for selected crystalline/amorphous polymer blends and block copolymers./
Author:	Schroeder, John Robert.
Description:	383 p.
Notes:	Source: Dissertation Abstracts International, Volume: 50-09, Section: B, page: 4025.
Contained By:	Dissertation Abstracts International50-09B.
Subject:	Chemistry, Polymer. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9004257

Miscibility and physical properties for selected crystalline/amorphous polymer blends and block copolymers.
Schroeder, John Robert.

Miscibility and physical properties for selected crystalline/amorphous polymer blends and block copolymers. - 383 p.

Source: Dissertation Abstracts International, Volume: 50-09, Section: B, page: 4025.

Thesis (Ph.D.)--The University of Akron, 1989.

The nature of the molecular interaction and formation of domains in polymer blends and triblock copolymers has been studied using select model polymer systems. Seven crystalline/amorphous polymer blends and one crystalline/crystalline polymer blend of varing composition were studied. Binary polymer systems examined include different ethylene-propylene copolymers (EPR) of varing ethylene content with polyethylene (PE), different ethylene-butadiene copolyemers of varing ethylene content with PE, trans-polybutadiene with PE, and cis- with trans-polybutadiene. Three model triblock copolymers containing an elastomeric center block and crystalline end blocks were also studied. These ABA type copolymers contain a center block segment composed of different EPR copolymers and with end-blocks segments composed of PE.Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Miscibility and physical properties for selected crystalline/amorphous polymer blends and block copolymers.
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008 130610s1989 eng d
035 $a (UnM)AAI9004257
035 $a AAI9004257
040 $a UnM $c UnM
100 1 $a Schroeder, John Robert. $3 1905827
245 1 0 $a Miscibility and physical properties for selected crystalline/amorphous polymer blends and block copolymers.
300 $a 383 p.
500 $a Source: Dissertation Abstracts International, Volume: 50-09, Section: B, page: 4025.
502 $a Thesis (Ph.D.)--The University of Akron, 1989.
520 $a The nature of the molecular interaction and formation of domains in polymer blends and triblock copolymers has been studied using select model polymer systems. Seven crystalline/amorphous polymer blends and one crystalline/crystalline polymer blend of varing composition were studied. Binary polymer systems examined include different ethylene-propylene copolymers (EPR) of varing ethylene content with polyethylene (PE), different ethylene-butadiene copolyemers of varing ethylene content with PE, trans-polybutadiene with PE, and cis- with trans-polybutadiene. Three model triblock copolymers containing an elastomeric center block and crystalline end blocks were also studied. These ABA type copolymers contain a center block segment composed of different EPR copolymers and with end-blocks segments composed of PE.
520 $a Characterization of both homopolymers and copolymers was carried out with membrane osometry, gel permeation chromatography, nuclear magnetic resonance, and infrared spectroscopy. Blend miscibility was determined by calculation of the thermodynamic interaction parameter ( $\ chi $) based on the measurement of melting point depression using differential scanning calorimetry (DSC). Experimental results yield values of $\ chi $ close to zero for all systems investigated. These results are in good agreement with that prediced by theory and with that reported elsewhere for polymers having similar molecular structures. The morphology of both the blends and triblock copolymers was studied using wide angle x-ray scattering (WAXS), small angle light scattering (SALS), optical microscopy, and dynamic mechanical spectroscopy (Rheovibron). For all materials investigated, except for c/t-PBD mixtures, a spherulitic type morphology was observed. Both spherulite size and perfection of the crystal were found to depend on molecular structure, composition, and on the ability of the individual homopolymer molecules to co-crystallize. The degree of phase separation in the triblock copolymers was additionally examined using electron microscopy. Changes in triblock copolymer morphology under uniaxial deformation was also studied using WAXS, SALS, and DSC. Results indicate an increase in crystal ordering and degree of crystallinity with increasing percent strain. As the ethylene content in the EPR center block is increased, a corresponding increase tensile properties is observed. Results are explained based on a relationship between molecular structure, morphology, and mechanical properties.
590 $a School code: 0003.
650 4 $a Chemistry, Polymer. $3 1018428
690 $a 0495
710 2 0 $a The University of Akron. $3 1018399
773 0 $t Dissertation Abstracts International $g 50-09B.
790 $a 0003
791 $a Ph.D.
792 $a 1989
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9004257