Effect of physical aging on the shape-memory behavior of amorphous networks

Jinwoo Choi; Alicia M. Ortega; Rui Xiao; Christopher M. Yakacki; Thao D. Nguyen

doi:10.1016/j.polymer.2012.03.066

Effect of physical aging on the shape-memory behavior of amorphous networks

Jinwoo Choi
, Alicia M. Ortega
, Rui Xiao
, Christopher M. Yakacki
, Thao D. Nguyen

Research output: Contribution to journal › Article › peer-review

Abstract

This paper presents an experimental and modeling study of the effects of physical aging on the shape-memory performance of (meth)acrylate-based networks composed of tert-butyl acrylate (tBA) crosslinked by various concentrations of poly(ethylene glycol dimethacrylate) (PEGDMA). The experiments measured the unconstrained recovery response of samples stored at 20 °C (T_g - 36 °C) for zero to 180 days and evaluated the effects of storage on the strain fixity, activation temperature, and initial recovery rate. A thermoviscoelastic model recently developed for amorphous networks near the T_g was applied to study the influence of structural and viscoelastic relaxation and the aging time and temperature on the recovery response. Results showed that the activation temperature and the initial recovery rate increased with the aging time, producing a sharper initial recovery response. The thermoviscoelastic model predicted that the magnitude of these effects depended on the aging temperature. There was an optimum aging temperature that maximized the initial recovery rate. These results suggest that physical aging can be manipulated to accelerate the recovery performance of shape-memory polymer devices.

Original language	English (US)
Pages (from-to)	2453-2464
Number of pages	12
Journal	Polymer
Volume	53
Issue number	12
DOIs	https://doi.org/10.1016/j.polymer.2012.03.066
State	Published - May 25 2012
Externally published	Yes

Keywords

Physical aging
Shape-memory polymers
Viscoelasticity

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Materials Chemistry

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10.1016/j.polymer.2012.03.066

Cite this

@article{98828c7a5b154b5984403414d8544c1b,

title = "Effect of physical aging on the shape-memory behavior of amorphous networks",

abstract = "This paper presents an experimental and modeling study of the effects of physical aging on the shape-memory performance of (meth)acrylate-based networks composed of tert-butyl acrylate (tBA) crosslinked by various concentrations of poly(ethylene glycol dimethacrylate) (PEGDMA). The experiments measured the unconstrained recovery response of samples stored at 20 °C (Tg - 36 °C) for zero to 180 days and evaluated the effects of storage on the strain fixity, activation temperature, and initial recovery rate. A thermoviscoelastic model recently developed for amorphous networks near the Tg was applied to study the influence of structural and viscoelastic relaxation and the aging time and temperature on the recovery response. Results showed that the activation temperature and the initial recovery rate increased with the aging time, producing a sharper initial recovery response. The thermoviscoelastic model predicted that the magnitude of these effects depended on the aging temperature. There was an optimum aging temperature that maximized the initial recovery rate. These results suggest that physical aging can be manipulated to accelerate the recovery performance of shape-memory polymer devices.",

keywords = "Physical aging, Shape-memory polymers, Viscoelasticity",

author = "Jinwoo Choi and Ortega, \{Alicia M.\} and Rui Xiao and Yakacki, \{Christopher M.\} and Nguyen, \{Thao D.\}",

note = "Funding Information: This work was funded in part by the National Science Foundation ( CMMI-0758390 ) and the Laboratory Directed Research and Development program at Sandia National Laboratories . Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy under contract DE-ACO4-94AL85000. A. M. Ortega would like to acknowledge the guidance of Professors Ken Gall and Alan Greenberg in experimental design and analysis and financial support by Grant Number F31AR053466 from the National Institute of Arthritis and Musculoskeletal and Skin Diseases as well as the National Science Foundation Alliances for Graduate Education and the Professoriate grant at the University of Colorado (NSF HRD-0639653 ). ",

year = "2012",

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doi = "10.1016/j.polymer.2012.03.066",

language = "English (US)",

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publisher = "Elsevier B.V.",

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AU - Choi, Jinwoo

AU - Ortega, Alicia M.

AU - Xiao, Rui

AU - Yakacki, Christopher M.

AU - Nguyen, Thao D.

N1 - Funding Information: This work was funded in part by the National Science Foundation ( CMMI-0758390 ) and the Laboratory Directed Research and Development program at Sandia National Laboratories . Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy under contract DE-ACO4-94AL85000. A. M. Ortega would like to acknowledge the guidance of Professors Ken Gall and Alan Greenberg in experimental design and analysis and financial support by Grant Number F31AR053466 from the National Institute of Arthritis and Musculoskeletal and Skin Diseases as well as the National Science Foundation Alliances for Graduate Education and the Professoriate grant at the University of Colorado (NSF HRD-0639653 ).

PY - 2012/5/25

Y1 - 2012/5/25

N2 - This paper presents an experimental and modeling study of the effects of physical aging on the shape-memory performance of (meth)acrylate-based networks composed of tert-butyl acrylate (tBA) crosslinked by various concentrations of poly(ethylene glycol dimethacrylate) (PEGDMA). The experiments measured the unconstrained recovery response of samples stored at 20 °C (Tg - 36 °C) for zero to 180 days and evaluated the effects of storage on the strain fixity, activation temperature, and initial recovery rate. A thermoviscoelastic model recently developed for amorphous networks near the Tg was applied to study the influence of structural and viscoelastic relaxation and the aging time and temperature on the recovery response. Results showed that the activation temperature and the initial recovery rate increased with the aging time, producing a sharper initial recovery response. The thermoviscoelastic model predicted that the magnitude of these effects depended on the aging temperature. There was an optimum aging temperature that maximized the initial recovery rate. These results suggest that physical aging can be manipulated to accelerate the recovery performance of shape-memory polymer devices.

AB - This paper presents an experimental and modeling study of the effects of physical aging on the shape-memory performance of (meth)acrylate-based networks composed of tert-butyl acrylate (tBA) crosslinked by various concentrations of poly(ethylene glycol dimethacrylate) (PEGDMA). The experiments measured the unconstrained recovery response of samples stored at 20 °C (Tg - 36 °C) for zero to 180 days and evaluated the effects of storage on the strain fixity, activation temperature, and initial recovery rate. A thermoviscoelastic model recently developed for amorphous networks near the Tg was applied to study the influence of structural and viscoelastic relaxation and the aging time and temperature on the recovery response. Results showed that the activation temperature and the initial recovery rate increased with the aging time, producing a sharper initial recovery response. The thermoviscoelastic model predicted that the magnitude of these effects depended on the aging temperature. There was an optimum aging temperature that maximized the initial recovery rate. These results suggest that physical aging can be manipulated to accelerate the recovery performance of shape-memory polymer devices.

KW - Physical aging

KW - Shape-memory polymers

KW - Viscoelasticity

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JO - Polymer

JF - Polymer

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ER -

Effect of physical aging on the shape-memory behavior of amorphous networks

Abstract

Keywords

ASJC Scopus subject areas

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