東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Aspects of environmental degradation...

Walsh, Peter J.

Linked to FindBook

Google Book

Amazon

博客來

Aspects of environmental degradation and fracture in polymer films and fibers.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Aspects of environmental degradation and fracture in polymer films and fibers./
Author:	Walsh, Peter J.
Description:	217 p.
Notes:	Adviser: Alan J. Lesser.
Contained By:	Dissertation Abstracts International68-11B.
Subject:	Chemistry, Polymer. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3289223
ISBN:	9780549330325

Aspects of environmental degradation and fracture in polymer films and fibers.
Walsh, Peter J.

Aspects of environmental degradation and fracture in polymer films and fibers. - 217 p.

Adviser: Alan J. Lesser.

Thesis (Ph.D.)--University of Massachusetts Amherst, 2007.

This thesis is focused in three areas: An investigation of a thermodynamic criterion for failure by environmental stress cracking using observations of the wetting behavior of stress-cracking liquids on glassy polymer substrates; Determination of the dominant chemical and physical degradation mechanisms associated with exposure of poly-p-phenylenebisbenzoxazole fiber to moisture moisture and UV-Vis spectrum light; And finally, the effect of constraint on fracture at a bi-material interface is investigated using a model epoxy-metallic adherend specimen.

ISBN: 9780549330325Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Aspects of environmental degradation and fracture in polymer films and fibers.
LDR:03536nam 2200361 a 45 001 957403
005 20110630
008 110630s2007 ||||||||||||||||| ||eng d
020 $a 9780549330325
035 $a (UMI)AAI3289223
035 $a AAI3289223
040 $a UMI $c UMI
100 1 $a Walsh, Peter J. $3 1280755
245 1 0 $a Aspects of environmental degradation and fracture in polymer films and fibers.
300 $a 217 p.
500 $a Adviser: Alan J. Lesser.
500 $a Source: Dissertation Abstracts International, Volume: 68-11, Section: B, page: 7607.
502 $a Thesis (Ph.D.)--University of Massachusetts Amherst, 2007.
520 $a This thesis is focused in three areas: An investigation of a thermodynamic criterion for failure by environmental stress cracking using observations of the wetting behavior of stress-cracking liquids on glassy polymer substrates; Determination of the dominant chemical and physical degradation mechanisms associated with exposure of poly-p-phenylenebisbenzoxazole fiber to moisture moisture and UV-Vis spectrum light; And finally, the effect of constraint on fracture at a bi-material interface is investigated using a model epoxy-metallic adherend specimen.
520 $a The wetting behavior of an ESC liquid on polycarbonate substrates has been evaluated as a function of substrate stress using a variation of Contact Adhesion Testing, a novel method of measuring small contact angles by refraction and conventional goniometry. The inelastic and elastic strain condition and time to the onset of crazing were also observed. A normalization of the time to onset of crazing using stress state, solubility difference and diffusion coefficients was shown to collapse the kinetic observations.
520 $a A comprehensive study of the degradation mechanisms of PBO AS fiber exposed in a controlled manner to challenging chemical environments, moisture and UV-Visible spectrum light was undertaken. Fibers were characterized using a broad range of mechanical and physical tests including tensile testing, Elemental Analysis, scanning electron microscopy, small angle X-ray diffraction, wide angle X-ray diffraction and attenuated total reflectance infrared spectroscopy. Degradation by moisture is found to be primarily due to a loosening of the fiber's fibrillar structure. Degradation by UV-Visible spectrum light is found to be chemical in nature involving hydrolytic disruption of the oxazole ring and possible subsequent conversion to an amide bond.
520 $a Approaches to alleviation of PBO AS fiber degradation were studied including super-critical carbon dioxide extraction of residual acid, the use of UV-Vis blocking coatings, compaction of the fiber microstructure and PBO AS/Siloxane composites prepared in super-critical carbon dioxide.
520 $a Finally, the effect of constraint on fracture at the interface between a polymer and adherend having orders of magnitude larger stiffness was studied using a model epoxy/metallic adherend system. Fracture energy was measured using an Elastic Wedge Opened Double Cantilevered Beam test and the process zone imaged using photoelastic methods.
590 $a School code: 0118.
650 4 $a Chemistry, Polymer. $3 1018428
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Plastics Technology. $3 1023683
690 $a 0495
690 $a 0794
690 $a 0795
710 2 $a University of Massachusetts Amherst. $b Polymer Science & Engineering. $3 1018485
773 0 $t Dissertation Abstracts International $g 68-11B.
790 $a 0118
790 1 0 $a Donovan, James A. $e committee member
790 1 0 $a Farris, Richard J. $e committee member
790 1 0 $a Lesser, Alan J., $e advisor
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3289223