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Title: Tungsten-loaded SMP foam nanocomposites with inherent radiopacity and tunable thermo-mechanical properties

Abstract

Shape memory polymer (SMP) foams have been developed for use in neurovascular occlusion applications. These materials are predominantly polyurethanes that are known for their biocompatibility and tunable properties. However, these polymers inherently lack X–ray visibility, which is a significant challenge for their use as implantable materials. Herein, low density, highly porous shape memory polyurethane foams were developed with tungsten nanoparticles dispersed into the foam matrix, at increasing concentrations, to serve as a radiopaque agent. Utilizing X–ray fluoroscopy sufficient visibility of the foams at small geometries was observed. Thermal characterization of the foams indicated altered thermal response and delayed foam actuation with increasing nanoparticle loading (because of restricted network mobility). Mechanical testing indicated decreased toughness and strength for higher loading because of disruption of the SMP matrix. Altogether, filler addition imparted x–ray visibility to the SMP foams and allowed for tuned control of the transition temperature and actuation kinetics for the material.

Authors:
 [1];  [1];  [2];  [1];  [1];  [3];  [1]
  1. Texas A & M Univ., College Station, TX (United States)
  2. Univ. of Minnesota, Minneapolis, MN (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1458707
Report Number(s):
LLNL-JRNL-736517
Journal ID: ISSN 1042-7147; 888820
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Polymers for Advanced Technologies
Additional Journal Information:
Journal Volume: 27; Journal Issue: 2; Journal ID: ISSN 1042-7147
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING; 59 BASIC BIOLOGICAL SCIENCES; nanocomposite; radiopacity; dispersion; aneurysm; glass transition temperature

Citation Formats

Hasan, Sayyeda M., Harmon, Garrett, Zhou, Fang, Raymond, Jeffery E., Gustafson, Tiffany P., Wilson, Thomas S., and Maitland, Duncan J. Tungsten-loaded SMP foam nanocomposites with inherent radiopacity and tunable thermo-mechanical properties. United States: N. p., 2015. Web. doi:10.1002/pat.3621.
Hasan, Sayyeda M., Harmon, Garrett, Zhou, Fang, Raymond, Jeffery E., Gustafson, Tiffany P., Wilson, Thomas S., & Maitland, Duncan J. Tungsten-loaded SMP foam nanocomposites with inherent radiopacity and tunable thermo-mechanical properties. United States. doi:10.1002/pat.3621.
Hasan, Sayyeda M., Harmon, Garrett, Zhou, Fang, Raymond, Jeffery E., Gustafson, Tiffany P., Wilson, Thomas S., and Maitland, Duncan J. Tue . "Tungsten-loaded SMP foam nanocomposites with inherent radiopacity and tunable thermo-mechanical properties". United States. doi:10.1002/pat.3621. https://www.osti.gov/servlets/purl/1458707.
@article{osti_1458707,
title = {Tungsten-loaded SMP foam nanocomposites with inherent radiopacity and tunable thermo-mechanical properties},
author = {Hasan, Sayyeda M. and Harmon, Garrett and Zhou, Fang and Raymond, Jeffery E. and Gustafson, Tiffany P. and Wilson, Thomas S. and Maitland, Duncan J.},
abstractNote = {Shape memory polymer (SMP) foams have been developed for use in neurovascular occlusion applications. These materials are predominantly polyurethanes that are known for their biocompatibility and tunable properties. However, these polymers inherently lack X–ray visibility, which is a significant challenge for their use as implantable materials. Herein, low density, highly porous shape memory polyurethane foams were developed with tungsten nanoparticles dispersed into the foam matrix, at increasing concentrations, to serve as a radiopaque agent. Utilizing X–ray fluoroscopy sufficient visibility of the foams at small geometries was observed. Thermal characterization of the foams indicated altered thermal response and delayed foam actuation with increasing nanoparticle loading (because of restricted network mobility). Mechanical testing indicated decreased toughness and strength for higher loading because of disruption of the SMP matrix. Altogether, filler addition imparted x–ray visibility to the SMP foams and allowed for tuned control of the transition temperature and actuation kinetics for the material.},
doi = {10.1002/pat.3621},
journal = {Polymers for Advanced Technologies},
number = 2,
volume = 27,
place = {United States},
year = {Tue Aug 11 00:00:00 EDT 2015},
month = {Tue Aug 11 00:00:00 EDT 2015}
}

Journal Article:
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Cited by: 10 works
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Works referenced in this record:

Shape memory polymers based on uniform aliphatic urethane networks
journal, January 2007

  • Wilson, T. S.; Bearinger, J. P.; Herberg, J. L.
  • Journal of Applied Polymer Science, Vol. 106, Issue 1, p. 540-551
  • DOI: 10.1002/app.26593

Controlling the Actuation Rate of Low-Density Shape-Memory Polymer Foams in Water
journal, October 2012

  • Singhal, Pooja; Boyle, Anthony; Brooks, Marilyn L.
  • Macromolecular Chemistry and Physics, Vol. 214, Issue 11, p. 1204-1214
  • DOI: 10.1002/macp.201200342