Mechanical performance of polysulfone, polybutylene, and polyamide 6/6 in hot chlorinated water

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Polymer materials considered for use in domestic hot water heating systems must maintain mechanical properties in the working fluid over their target lifetimes. In potable water, chlorine and pH combine to create an oxidative environment, commonly characterized by the oxidative reduction potential (ORP), that can chemically attack a polymer, resulting in permanent loss of mechanical strength and stiffness. Water absorption and hydrolysis can also impact polymer properties. In the present study, experiments were conducted to evaluate the mechanical performance of polysulfone, polybutylene, and polyamide 6/6 immersed for up to 1100 h in water at ORP levels of 550 and 825 mV at 60 and 80 °C. Mechanical performance was evaluated by measuring creep compliance and the change in tensile strength and molecular weight after exposure. Surface morphology of the exposed materials was examined using scanning electron microscopy. Polyamide 6/6 showed significant degradation in strength and creep compliance in all environments. Despite some variability in measured properties, the blend of polybutylene, which has additives to prolong life, did not degrade. Polysulfone performed the best of the three materials with no discernable change in properties over the duration of the experiments.

Original languageEnglish (US)
Pages (from-to)624-637
Number of pages14
JournalSolar Energy
Volume79
Issue number6
DOIs
StatePublished - Dec 1 2005

Fingerprint

Polysulfones
Polyamides
Polymers
Water
Creep
Hot water heating
Chlorine
Water absorption
Potable water
Drinking Water
Strength of materials
Surface morphology
Hydrolysis
Tensile strength
Experiments
Molecular weight
Stiffness
Degradation
Mechanical properties
Scanning electron microscopy

Keywords

  • Creep compliance
  • Heat exchanger
  • Polymer

Cite this

Mechanical performance of polysulfone, polybutylene, and polyamide 6/6 in hot chlorinated water. / Freeman, Andrew; Mantell, Susan C; Davidson, Jane H.

In: Solar Energy, Vol. 79, No. 6, 01.12.2005, p. 624-637.

Research output: Contribution to journalArticle

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AB - Polymer materials considered for use in domestic hot water heating systems must maintain mechanical properties in the working fluid over their target lifetimes. In potable water, chlorine and pH combine to create an oxidative environment, commonly characterized by the oxidative reduction potential (ORP), that can chemically attack a polymer, resulting in permanent loss of mechanical strength and stiffness. Water absorption and hydrolysis can also impact polymer properties. In the present study, experiments were conducted to evaluate the mechanical performance of polysulfone, polybutylene, and polyamide 6/6 immersed for up to 1100 h in water at ORP levels of 550 and 825 mV at 60 and 80 °C. Mechanical performance was evaluated by measuring creep compliance and the change in tensile strength and molecular weight after exposure. Surface morphology of the exposed materials was examined using scanning electron microscopy. Polyamide 6/6 showed significant degradation in strength and creep compliance in all environments. Despite some variability in measured properties, the blend of polybutylene, which has additives to prolong life, did not degrade. Polysulfone performed the best of the three materials with no discernable change in properties over the duration of the experiments.

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