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

Journal Article · · Journal of Applied Polymer Science
DOI:https://doi.org/10.1002/app.41226· OSTI ID:1343094
 [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

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.

Research Organization:
Texas A&M Univ., College Station, TX (United States)
Sponsoring Organization:
USDOE; National Institutes of Health (NIH)
Grant/Contract Number:
AC52-07NA27344; R01EB000462
OSTI ID:
1343094
Journal Information:
Journal of Applied Polymer Science, Vol. 132, Issue 1; ISSN 0021-8995
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

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Cited By (1)

Thermoset shape memory polymers and their composites journal July 2016