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Title: Silicone membranes to inhibit water uptake into thermoset polyurethane shape-memory polymer conductive composites

Electroactive shape memory polymer (SMP) composites capable of shape actuation via resistive heating are of interest for various biomedical applications. However, water uptake into SMPs will produce a depression of the glass transition temperature (T g) resulting in shape recovery in vivo. While water actuated shape recovery may be useful, it is foreseen to be undesirable during early periods of surgical placement into the body. Silicone membranes have been previously reported to prevent release of conductive filler from an electroactive polymer composite in vivo. In this paper, a silicone membrane was used to inhibit water uptake into a thermoset SMP composite containing conductive filler. Thermoset polyurethane SMPs were loaded with either 5 wt % carbon black or 5 wt % carbon nanotubes, and subsequently coated with either an Al 2O 3- or silica-filled silicone membrane. It was observed that the silicone membranes, particularly the silica-filled membrane, reduced the rate of water absorption (37°C) and subsequent T g depression versus uncoated composites. Finally, in turn, this led to a reduction in the rate of recovery of the permanent shape when exposed to water at 37°C.
Authors:
 [1] ;  [1] ;  [2] ;  [1]
  1. Texas A&M Univ., College Station, TX (United States). Dept. of Biomedical Engineering
  2. Texas A&M Univ., College Station, TX (United States). Dept. of Biomedical Engineering; Texas A&M Univ., College Station, TX (United States). Dept. of Materials Science and Engineering
Publication Date:
Grant/Contract Number:
AC52-07NA27344; R01EB000462
Type:
Accepted Manuscript
Journal Name:
Journal of Applied Polymer Science
Additional Journal Information:
Journal Volume: 132; Journal Issue: 1; Journal ID: ISSN 0021-8995
Publisher:
Wiley
Research Org:
Texas A&M Univ., College Station, TX (United States)
Sponsoring Org:
USDOE; National Institutes of Health (NIH)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 59 BASIC BIOLOGICAL SCIENCES; biomedical applications; conducting polymers; thermosets; polyurethanes
OSTI Identifier:
1343094

Yu, Ya-Jen, Infanger, Stephen, Grunlan, Melissa A., and Maitland, Duncan J.. Silicone membranes to inhibit water uptake into thermoset polyurethane shape-memory polymer conductive composites. United States: N. p., Web. doi:10.1002/app.41226.
Yu, Ya-Jen, Infanger, Stephen, Grunlan, Melissa A., & Maitland, Duncan J.. Silicone membranes to inhibit water uptake into thermoset polyurethane shape-memory polymer conductive composites. United States. doi:10.1002/app.41226.
Yu, Ya-Jen, Infanger, Stephen, Grunlan, Melissa A., and Maitland, Duncan J.. 2014. "Silicone membranes to inhibit water uptake into thermoset polyurethane shape-memory polymer conductive composites". United States. doi:10.1002/app.41226. https://www.osti.gov/servlets/purl/1343094.
@article{osti_1343094,
title = {Silicone membranes to inhibit water uptake into thermoset polyurethane shape-memory polymer conductive composites},
author = {Yu, Ya-Jen and Infanger, Stephen and Grunlan, Melissa A. and Maitland, Duncan J.},
abstractNote = {Electroactive shape memory polymer (SMP) composites capable of shape actuation via resistive heating are of interest for various biomedical applications. However, water uptake into SMPs will produce a depression of the glass transition temperature (Tg) resulting in shape recovery in vivo. While water actuated shape recovery may be useful, it is foreseen to be undesirable during early periods of surgical placement into the body. Silicone membranes have been previously reported to prevent release of conductive filler from an electroactive polymer composite in vivo. In this paper, a silicone membrane was used to inhibit water uptake into a thermoset SMP composite containing conductive filler. Thermoset polyurethane SMPs were loaded with either 5 wt % carbon black or 5 wt % carbon nanotubes, and subsequently coated with either an Al2O3- or silica-filled silicone membrane. It was observed that the silicone membranes, particularly the silica-filled membrane, reduced the rate of water absorption (37°C) and subsequent Tg depression versus uncoated composites. Finally, in turn, this led to a reduction in the rate of recovery of the permanent shape when exposed to water at 37°C.},
doi = {10.1002/app.41226},
journal = {Journal of Applied Polymer Science},
number = 1,
volume = 132,
place = {United States},
year = {2014},
month = {7}
}