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US 8,618,238 B2Granted
Shape memory epoxy polymers
AssigneeGM Global Technology Operations LLC
InventorsTao Xie, Daniel E. Rodak, William R. Rodgers
Life of this patent
Estimating the term…
Abstract
One embodiment includes compositions of shape memory epoxy polymers.
Claims24
An epoxy shape memory polymer composition comprising:
- a rigid epoxy;
- a flexible epoxy;
- and
- at least one of a crosslinking agent or a catalytic curing agent;
- wherein the rigid epoxy is an aromatic epoxy having at least two epoxide groups, the flexible epoxy is an aliphatic epoxy having at least two epoxide groups, and the crosslinking agent is one of a multi-amine, an organic multi-carboxylic acid, or an anhydride;
- and
- wherein the components are present in an amount sufficient to provide, upon curing of the composition, an epoxy shape memory polymer having a change in storage modulus of 2 to 3 orders of magnitude before and after its glass transition, and a glass transition temperature below 100° C. wherein the total molar amount of aromatic epoxy plus aliphatic epoxy is about twice the total molar amount of cross-linking agent.
4 more elements
An epoxy shape memory polymer comprising:
- a reaction product of a rigid epoxy, a flexible epoxy, and a crosslinking agent;
- wherein the rigid epoxy is an aromatic epoxy having at least two epoxide groups, the flexible epoxy is an aliphatic epoxy having at least two epoxide groups, and the crosslinking agent is a diamine;
- wherein the aromatic epoxy, the aliphatic epoxy, and the crosslinking agent are present in an amount that provides a total molar amount of aromatic epoxy plus aliphatic epoxy is about twice a total molar amount of diamines;
- wherein the epoxy shape memory polymer has a glass transition temperature below 100° C. and a narrowness of the glass transition about 7° C. or less;
- and
- wherein the epoxy shape memory polymer has a change in storage modulus of 2 or 3 orders of magnitude before and after its glass transition.
3 more elements
Dependencies are inferred from the claim text.