LAWRENCE LIVERMORE NATIONAL SECURITY, LLC;The Texas A&M University System
发明人:
Pooja Singhal,Thomas S. Wilson,Elizabeth Cosgriff-Hernandez,Duncan J. Maitland
申请号：
US15269516
公开号：
US09840577B2
申请日:
2016.09.19
申请国别(地区):
US
年份:
2017
代理人:
摘要：
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.
