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The effect of hard-segment content, temperature, and thermal history on the morphology of polyurethane block copolymers.

Record Type:	Electronic resources : Monograph/item
Title/Author:	The effect of hard-segment content, temperature, and thermal history on the morphology of polyurethane block copolymers./
Author:	Galambos, Adam Frank.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 1989,
Description:	381 p.
Notes:	Source: Dissertations Abstracts International, Volume: 51-07, Section: B.
Contained By:	Dissertations Abstracts International51-07B.
Subject:	Materials science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8920420
ISBN:	9798641857411

The effect of hard-segment content, temperature, and thermal history on the morphology of polyurethane block copolymers.
Galambos, Adam Frank.

The effect of hard-segment content, temperature, and thermal history on the morphology of polyurethane block copolymers. - Ann Arbor : ProQuest Dissertations & Theses, 1989 - 381 p.

Source: Dissertations Abstracts International, Volume: 51-07, Section: B.

Thesis (Ph.D.)--Princeton University, 1989.

This item must not be sold to any third party vendors.

Polyurethane block copolymers are an industrially important class of polymers for which it is difficult to formulate consistent structure-property relationships because of the sensitivity of microscopic morphology, and therefore resultant end-use properties, on composition and processing history. This thesis includes two separate but related studies, the first of which develops structure-property relations for a particular polyurethane as a function of block copolymer composition, and the second of which investigates the changes in morphology and resultant physical properties of a class of these polymers as a function of two processing variables: temperature and thermal history. The materials examined in this study were based on copolymers of 4-4$\\sp\\prime$ methyl-diphenyl-diisocyanate (MDI) chain extended with butane diol (BD) and reacted with a rubbery diol with a molecular weight of about 2000 composed of poly(propylene oxide) and poly(ethylene oxide). The thermal studies focused primarily on a 60% by weight hard-segment (MDI/BD) material. A series of compression molded specimens were examined by differential scanning calorimetry (DSC), thermal-mechanical analysis (TMA), including flexure and penetration probe testing, and simultaneous small- or wide-angle X-ray scattering/DSC, in order to correlate transitions observed by the various techniques with microstructural changes occurring in each material as a function of polymer hard-segment content and temperature. The dependence of microscopic morphology on thermal history was examined by performing isothermal annealing experiments on specimens of 60% hard-segment content as they were quenched from the homogeneous melt state at 240$\\sp\\circ$C to various annealing temperatures ranging from 100 to 190$\\sp\\circ$C. The morphologies developed by annealing were correlated with the multiple endotherms observed in DSC analysis of annealed polyurethanes by performing simultaneous DSC/X-ray scattering experiments on the conditioned specimens. Additional experiments measured the softening point of the annealed materials by a thermal-mechanical penetration probe technique and correlated this transition with DSC and X-ray scattering transitions. (Abstract shortened with permission of author.).

ISBN: 9798641857411Subjects--Topical Terms:

543314
Materials science.

The effect of hard-segment content, temperature, and thermal history on the morphology of polyurethane block copolymers.
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245 1 4 $a The effect of hard-segment content, temperature, and thermal history on the morphology of polyurethane block copolymers.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 1989
300 $a 381 p.
500 $a Source: Dissertations Abstracts International, Volume: 51-07, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
502 $a Thesis (Ph.D.)--Princeton University, 1989.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a Polyurethane block copolymers are an industrially important class of polymers for which it is difficult to formulate consistent structure-property relationships because of the sensitivity of microscopic morphology, and therefore resultant end-use properties, on composition and processing history. This thesis includes two separate but related studies, the first of which develops structure-property relations for a particular polyurethane as a function of block copolymer composition, and the second of which investigates the changes in morphology and resultant physical properties of a class of these polymers as a function of two processing variables: temperature and thermal history. The materials examined in this study were based on copolymers of 4-4$\\sp\\prime$ methyl-diphenyl-diisocyanate (MDI) chain extended with butane diol (BD) and reacted with a rubbery diol with a molecular weight of about 2000 composed of poly(propylene oxide) and poly(ethylene oxide). The thermal studies focused primarily on a 60% by weight hard-segment (MDI/BD) material. A series of compression molded specimens were examined by differential scanning calorimetry (DSC), thermal-mechanical analysis (TMA), including flexure and penetration probe testing, and simultaneous small- or wide-angle X-ray scattering/DSC, in order to correlate transitions observed by the various techniques with microstructural changes occurring in each material as a function of polymer hard-segment content and temperature. The dependence of microscopic morphology on thermal history was examined by performing isothermal annealing experiments on specimens of 60% hard-segment content as they were quenched from the homogeneous melt state at 240$\\sp\\circ$C to various annealing temperatures ranging from 100 to 190$\\sp\\circ$C. The morphologies developed by annealing were correlated with the multiple endotherms observed in DSC analysis of annealed polyurethanes by performing simultaneous DSC/X-ray scattering experiments on the conditioned specimens. Additional experiments measured the softening point of the annealed materials by a thermal-mechanical penetration probe technique and correlated this transition with DSC and X-ray scattering transitions. (Abstract shortened with permission of author.).
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