Impact modification of poly(vinyl chloride) with chlorinated polyethylene

Bibliographic Details
Main Author:	Tse, Albert Sze-Kwong
Language:	English
Published:	Case Western Reserve University School of Graduate Studies / OhioLINK 1990
Subjects:	chlorinated polyethylene
Online Access:	http://rave.ohiolink.edu/etdc/view?acc_num=case1054834010

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spelling	ndltd-OhioLink-oai-etd.ohiolink.edu-case10548340102021-08-03T05:30:26Z Impact modification of poly(vinyl chloride) with chlorinated polyethylene Tse, Albert Sze-Kwong chlorinated polyethylene In this work, the structure-property relationships and the damage mechanisms of translucent blends of experimental chlorinated polyethylene (CPE) and poly(vinyl chloride) (PVC) were studied. The damage mechanisms of the PVC control with a semicircular notch and with a sharp notch were also reported. Chapter 1 examines the effects of CPE chlorine content and chlorine distribution on the morphology, optical clarity and toughness of blends with PVC. Increasing the residual crystallinity and increasing chlorine both increased the refractive index closer to that of PVC. A linear relationship was observed between the fourth power of the refractive index and the CPE glass transition temperature. With a phase separated blend morphology in all cases, improved transparency was achieved in this system by reducing the refractive index difference between CPE and PVC. Modifications of the experimental CPE resins that improved optical transparency of the blends also reduced the toughness enhancement. Chapter 2 describes the stress-whitened damage zone that formed ahead of a semicircular notch of translucent PVC/CPE blends during slow tensile loading. When the zone was small, the plane strain condition applied and from the elastic stress distribution a constant mean st ress condition was found at the boundary of the damage zone. The critical volume strain was independent of composition and was the controlling parameter for cavitation. When the zone was larger, the shape was qualitatively described by stress redistribution concepts. Macroscopic flow and necking were only detected near the maximum in the stress-displacement curve. The damage mechanisms of PVC with a semicircular notch under slow tensile loading as a function of specimen thickness is reported in Chapter 3. Core yielding composed of slip lines grew from the notch surface in the center of the specimen. A stress-whitened zone was initiated near the tip of the initial slip line zone. The critical mean stress for stress-whitening was calculated to be 42.5 ± 1.5 MPa by a plastic stress analysis of a pressure-dependent yield material. By assuming a constant mean stress along the zone boundary, a one-dimensional shifting of the elastic stress distribution was obtained at different remote stresses. The stress-whitening was attributed to voiding from SEM of cryofracture surfaces. At higher stresses, shear flow processes similar to polycarbonate were observed, namely hinge shear and intersecting shear for thick and thin sheet, respectively. Crazing was absent in thoroughly clean specimens. 1990 English text Case Western Reserve University School of Graduate Studies / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=case1054834010 http://rave.ohiolink.edu/etdc/view?acc_num=case1054834010 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection	NDLTD
language	English
sources	NDLTD
topic	chlorinated polyethylene
spellingShingle	chlorinated polyethylene Tse, Albert Sze-Kwong Impact modification of poly(vinyl chloride) with chlorinated polyethylene
author	Tse, Albert Sze-Kwong
author_facet	Tse, Albert Sze-Kwong
author_sort	Tse, Albert Sze-Kwong
title	Impact modification of poly(vinyl chloride) with chlorinated polyethylene
title_short	Impact modification of poly(vinyl chloride) with chlorinated polyethylene
title_full	Impact modification of poly(vinyl chloride) with chlorinated polyethylene
title_fullStr	Impact modification of poly(vinyl chloride) with chlorinated polyethylene
title_full_unstemmed	Impact modification of poly(vinyl chloride) with chlorinated polyethylene
title_sort	impact modification of poly(vinyl chloride) with chlorinated polyethylene
publisher	Case Western Reserve University School of Graduate Studies / OhioLINK
publishDate	1990
url	http://rave.ohiolink.edu/etdc/view?acc_num=case1054834010
work_keys_str_mv	AT tsealbertszekwong impactmodificationofpolyvinylchloridewithchlorinatedpolyethylene
_version_	1719421029858672640

Impact modification of poly(vinyl chloride) with chlorinated polyethylene

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