MORPHOLOGY and MECHANICAL PERFORMANCE of PIPE GRADE HDPE EXPOSED to CHLORINATED WATER

Andrew Hagen; Susan C. Mantell; Mrinal Bhattacharya

MORPHOLOGY and MECHANICAL PERFORMANCE of PIPE GRADE HDPE EXPOSED to CHLORINATED WATER

Andrew Hagen, Susan C. Mantell, Mrinal Bhattacharya

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

Thin samples of a pipe-grade polyethylene with a bimodal 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 unimodal 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 crystallinity 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 chemicrystallization and subsequently delay the onset of brittle behavior.

Original language	English (US)
Title of host publication	SPE ANTEC 2020
Subtitle of host publication	The Annual Technical Conference for Plastic Professionals
Publisher	Society of Plastics Engineers
Pages	824-829
Number of pages	6
ISBN (Electronic)	9781713821182
State	Published - 2020
Event	SPE ANTEC 2020: Annual Technical Conference for Plastic Professionals - Virtual, Online Duration: Mar 30 2020 → May 5 2020

Publication series

Name	Annual Technical Conference - ANTEC, Conference Proceedings
Volume	2

Conference

Conference	SPE ANTEC 2020: Annual Technical Conference for Plastic Professionals
City	Virtual, Online
Period	3/30/20 → 5/5/20

Bibliographical note

Funding Information:
The authors gratefully acknowledge the financial support under Grant NSF/CMMI-1462080 to the University of Minnesota from the U.S. National Science Foundation. Parts of this work were carried out in the Characterization Facility at the University of Minnesota, which receives partial support from the National Science Foundation through the MRSEC program.

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

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MORPHOLOGY and MECHANICAL PERFORMANCE of PIPE GRADE HDPE EXPOSED to CHLORINATED WATER. / Hagen, Andrew; Mantell, Susan C.; Bhattacharya, Mrinal.
SPE ANTEC 2020: The Annual Technical Conference for Plastic Professionals. Society of Plastics Engineers, 2020. p. 824-829 (Annual Technical Conference - ANTEC, Conference Proceedings; Vol. 2).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Hagen, A, Mantell, SC & Bhattacharya, M 2020, MORPHOLOGY and MECHANICAL PERFORMANCE of PIPE GRADE HDPE EXPOSED to CHLORINATED WATER. in SPE ANTEC 2020: The Annual Technical Conference for Plastic Professionals. Annual Technical Conference - ANTEC, Conference Proceedings, vol. 2, Society of Plastics Engineers, pp. 824-829, SPE ANTEC 2020: Annual Technical Conference for Plastic Professionals, Virtual, Online, 3/30/20.

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abstract = "Thin samples of a pipe-grade polyethylene with a bimodal 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 unimodal 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 crystallinity 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 chemicrystallization and subsequently delay the onset of brittle behavior.",

author = "Andrew Hagen and Mantell, {Susan C.} and Mrinal Bhattacharya",

note = "Funding Information: The authors gratefully acknowledge the financial support under Grant NSF/CMMI-1462080 to the University of Minnesota from the U.S. National Science Foundation. Parts of this work were carried out in the Characterization Facility at the University of Minnesota, which receives partial support from the National Science Foundation through the MRSEC program. Publisher Copyright: {\textcopyright} 2020 Society of Plastics Engineers. All rights reserved.; SPE ANTEC 2020: Annual Technical Conference for Plastic Professionals ; Conference date: 30-03-2020 Through 05-05-2020",

year = "2020",

language = "English (US)",

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AU - Bhattacharya, Mrinal

N1 - Funding Information: The authors gratefully acknowledge the financial support under Grant NSF/CMMI-1462080 to the University of Minnesota from the U.S. National Science Foundation. Parts of this work were carried out in the Characterization Facility at the University of Minnesota, which receives partial support from the National Science Foundation through the MRSEC program. Publisher Copyright: © 2020 Society of Plastics Engineers. All rights reserved.

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N2 - Thin samples of a pipe-grade polyethylene with a bimodal 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 unimodal 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 crystallinity 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 chemicrystallization and subsequently delay the onset of brittle behavior.

AB - Thin samples of a pipe-grade polyethylene with a bimodal 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 unimodal 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 crystallinity 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 chemicrystallization and subsequently delay the onset of brittle behavior.

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ER -

MORPHOLOGY and MECHANICAL PERFORMANCE of PIPE GRADE HDPE EXPOSED to CHLORINATED WATER

Abstract

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