Morphology and mechanical performance of pipe grade hope exposed to chlorinated water

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Thin samples of a pipe-grade polyethylene with a bnnodal molecular weight distribution were exposed to 5 ppm chlorinated water at 70 °C for up to 3000 hours. The samples were characterized by tensile tests, size-exclusion chromatography, infrared spectroscopy, and differential scanning calorimetry. Throughout exposure, the molecular weight data showed evidence of degradation: weight-average molecular weight was reduced, and a shift occurred in the molecular weight distribution from a bimodal to a ummodal distribution (decreased dispersity). After 2250 hours of exposure, brittle behavior was observed, in which the average elongation at break was 12"/.. At this level of degradation, the weight-average molecular weight was 9% of its undegraded value, and the crystaflmity had increased from 70% to 85%. Average tensile strength was reduced from 31.8 to 16.6 MPa. The data imply that the presence of short-chain branching may inhibit chemiciystalhzation and subsequently delay the onset of brittle behavior.

Original languageEnglish (US)
Title of host publicationSPE ANTEC 2020
Subtitle of host publicationThe Annual Technical Conference for Plastic Professionals
PublisherSociety of Plastics Engineers
Pages1273-1278
Number of pages6
ISBN (Electronic)9781713821182
StatePublished - 2020
EventSPE ANTEC 2020: Annual Technical Conference for Plastic Professionals - Virtual, Online
Duration: Mar 30 2020May 5 2020

Publication series

NameAnnual Technical Conference - ANTEC, Conference Proceedings
Volume2

Conference

ConferenceSPE ANTEC 2020: Annual Technical Conference for Plastic Professionals
CityVirtual, Online
Period3/30/205/5/20

Bibliographical note

Publisher Copyright:
© 2020 Society of Plastics Engineers. All rights reserved.

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