Absorption kinetics and swelling stresses in hydrothermally aged epoxies investigated by photoelastic image analysis

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19 Citazioni (Scopus)

Abstract

The present work proposes an experimental optical methodology able to measure the transient swelling stresses induced by the water uptake ageing of polymers. In particular, the work describes the implementation of a Photoelastic technique to quantify internal stresses arising during the hydrothermal ageing of cast epoxy samples. The material investigated is a model DGEBA/DDS epoxy system. Curing and post-curing cycles have been optimised in order to obtain a fully cured, high Tg, and completely stress free initial condition. Rectangular beam samples were then left in a hydrothermal bath at 90 C, and regularly monitored by gravimetric and photoelastic analyses. The quantitative evolution of stresses induced by water ingress was obtained by a Photoelastic Stress Analysis technique applied during water absorption, and successive desorption in controlled conditions. The evolution of stresses is correlated with gravimetric data, allowing to gain a new insight to investigate the complex swelling and diffusion kinetics of water ingress into thermoset polymer networks.
Lingua originaleEnglish
pagine (da-a)55-63
Numero di pagine9
RivistaPolymer Degradation and Stability
Volume111
Stato di pubblicazionePublished - 2015

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image analysis
swelling
Image analysis
Swelling
Kinetics
kinetics
curing
water
Curing
Water
Polymers
rectangular beams
stress analysis
Thermosets
polymers
Water absorption
Stress analysis
residual stress
casts
baths

All Science Journal Classification (ASJC) codes

  • Materials Chemistry
  • Polymers and Plastics
  • Mechanics of Materials
  • Condensed Matter Physics

Cita questo

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title = "Absorption kinetics and swelling stresses in hydrothermally aged epoxies investigated by photoelastic image analysis",
abstract = "The present work proposes an experimental optical methodology able to measure the transient swelling stresses induced by the water uptake ageing of polymers. In particular, the work describes the implementation of a Photoelastic technique to quantify internal stresses arising during the hydrothermal ageing of cast epoxy samples. The material investigated is a model DGEBA/DDS epoxy system. Curing and post-curing cycles have been optimised in order to obtain a fully cured, high Tg, and completely stress free initial condition. Rectangular beam samples were then left in a hydrothermal bath at 90 C, and regularly monitored by gravimetric and photoelastic analyses. The quantitative evolution of stresses induced by water ingress was obtained by a Photoelastic Stress Analysis technique applied during water absorption, and successive desorption in controlled conditions. The evolution of stresses is correlated with gravimetric data, allowing to gain a new insight to investigate the complex swelling and diffusion kinetics of water ingress into thermoset polymer networks.",
author = "Giuseppe Spadaro and Giuseppe Pitarresi and Sabina Alessi and Michele Scafidi and {Di Filippo}, Maria and Claude Billaud",
year = "2015",
language = "English",
volume = "111",
pages = "55--63",
journal = "Polymer Degradation and Stability",
issn = "0141-3910",
publisher = "Elsevier Limited",

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TY - JOUR

T1 - Absorption kinetics and swelling stresses in hydrothermally aged epoxies investigated by photoelastic image analysis

AU - Spadaro, Giuseppe

AU - Pitarresi, Giuseppe

AU - Alessi, Sabina

AU - Scafidi, Michele

AU - Di Filippo, Maria

AU - Billaud, Claude

PY - 2015

Y1 - 2015

N2 - The present work proposes an experimental optical methodology able to measure the transient swelling stresses induced by the water uptake ageing of polymers. In particular, the work describes the implementation of a Photoelastic technique to quantify internal stresses arising during the hydrothermal ageing of cast epoxy samples. The material investigated is a model DGEBA/DDS epoxy system. Curing and post-curing cycles have been optimised in order to obtain a fully cured, high Tg, and completely stress free initial condition. Rectangular beam samples were then left in a hydrothermal bath at 90 C, and regularly monitored by gravimetric and photoelastic analyses. The quantitative evolution of stresses induced by water ingress was obtained by a Photoelastic Stress Analysis technique applied during water absorption, and successive desorption in controlled conditions. The evolution of stresses is correlated with gravimetric data, allowing to gain a new insight to investigate the complex swelling and diffusion kinetics of water ingress into thermoset polymer networks.

AB - The present work proposes an experimental optical methodology able to measure the transient swelling stresses induced by the water uptake ageing of polymers. In particular, the work describes the implementation of a Photoelastic technique to quantify internal stresses arising during the hydrothermal ageing of cast epoxy samples. The material investigated is a model DGEBA/DDS epoxy system. Curing and post-curing cycles have been optimised in order to obtain a fully cured, high Tg, and completely stress free initial condition. Rectangular beam samples were then left in a hydrothermal bath at 90 C, and regularly monitored by gravimetric and photoelastic analyses. The quantitative evolution of stresses induced by water ingress was obtained by a Photoelastic Stress Analysis technique applied during water absorption, and successive desorption in controlled conditions. The evolution of stresses is correlated with gravimetric data, allowing to gain a new insight to investigate the complex swelling and diffusion kinetics of water ingress into thermoset polymer networks.

UR - http://hdl.handle.net/10447/102485

M3 - Article

VL - 111

SP - 55

EP - 63

JO - Polymer Degradation and Stability

JF - Polymer Degradation and Stability

SN - 0141-3910

ER -