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Title: Ultra low density biodegradable shape memory polymer foams with tunable physical properties

Compositions and/or structures of degradable shape memory polymers (SMPs) ranging in form from neat/unfoamed to ultra low density materials of down to 0.005 g/cc density. These materials show controllable degradation rate, actuation temperature and breadth of transitions along with high modulus and excellent shape memory behavior. A method of m ly low density foams (up to 0.005 g/cc) via use of combined chemical and physical aking extreme blowing agents, where the physical blowing agents may be a single compound or mixtures of two or more compounds, and other related methods, including of using multiple co-blowing agents of successively higher boiling points in order to achieve a large range of densities for a fixed net chemical composition. Methods of optimization of the physical properties of the foams such as porosity, cell size and distribution, cell openness etc. of these materials, to further expand their uses and improve their performance.
Inventors:
; ; ;
Issue Date:
OSTI Identifier:
1413249
Assignee:
Lawrence Livermore National Security, LLC (Livermore, CA); The Texas A&M University System (College Station, TX) LLNL
Patent Number(s):
9,840,577
Application Number:
15/269,516
Contract Number:
AC52-07NA27344
Resource Relation:
Patent File Date: 2016 Sep 19
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Works referenced in this record:

Poly(ε-caprolactone)-based hyperbranched polyurethanes prepared via A2+B3 approach and its shape-memory behavior
journal, August 2009