Helmholtz-zentrum Geesthacht Zentrum Fur Material Und Kustenforschung Gmbh

Helmholtz-zentrum Geesthacht Zentrum Fuer Material- Und Kuestenforschung Gmbh

Marc Behl

Andreas Lendlein

Karl Kratz

Ulrich Noechel

Tilman Sauter

Srinivasa Reddy Chaganti

Yakai Feng

Jorg Zotzmann

Joerg Zotzmann

Reinhard Mohr

Narendra Kumar Uttamchand

Jörg Zotzmann

Ulrich NÖCHEL

The present invention relates to an article consisting of or comprising a bidirectional shape-memory polymer (bSMP), the bSMP comprising: first phase-segregated domains (AD) having a first transition temperature (T) corresponding to a crystallization transition or glass transition of the first domains (AD), second phase-segregated domains (SD) having a second transition temperature (T) corresponding to a crystallization transition or glass transition of the second domains (SD), the second transition temperature (T) being higher than the first transition temperature (T), and covalent or physical bonds cross-linking the polymer chains of the bSMP, and in this way interconnecting the first and second domains (AD, SD), wherein the second phase-separated domains (SD) form a skeleton which is at least partially embedded in the first phase-segregated domains (AD), and wherein polymer chain segments of the bSMP forming the first domains (AD) are substantially orientated in a common direction, such that the bSMP is able to undergo a reversible shape-shift between a first shape (A) at a first temperature (T) and a second shape (B) at a second temperature (T) upon variation of temperature between the first and second temperature (T, T) driven by the crystallization and melting or vitrification and melting of the first phase-separated domains (AD) and without application of an external stress, with T&#x3c;T&#x3c;T&#x3c;T.

Bidirectional shape-memory polymer, method of its production and its use

The present invention is directed to a method of preparing an actuator capable of being repeatedly and reversibly shifted between two freestanding shapes (A, B) under stress-free conditions upon varying a temperature between a temperature Tand a temperature T. The method comprising the steps:

Method of preparing a bidirectional shape-memory actuator and method of its use

The invention relates to a polymer network with triple-shape-memory effect and an associated programming method. The invention also relates to a method for producing layer systems made of shape-memory materials comprising the polymer network. The polymer network includes

Polymer network with triple shape effect and associated programming method

The invention relates to an article () made of a shape memory composite material () comprising a shape memory polymer () and a magnetic material () embedded therein, said shape memory polymer () after thermomechanical programming being capable of undergoing at least one temperature-induced transition from a temporary shape into a permanent shape, as well as to a method for the production thereof and a method for retrieving stored shapes. It is envisaged that the article () has at least two directly or indirectly interconnected sections () which differ by a different surface-to-volume ratio (S/V).

Article made of a shape-memory composite material, method for the production thereof, and method for retrieving stored shapes

A method for restoring a programmed article which contains a shape memory composite material of at least one shape memory polymer network with thermally inducible triple shape properties, the method comprising subjecting the article to a magnetic alternating field and simultaneously to an external heat supply in order to trigger the restoration, wherein at least one of the parameters of magnetic field strength (H) and ambient temperature (T) is increased continuously or discontinuously in such a way that the article first experiences a transition in shape from the first temporary shape (TF) into the second temporary shape (TF) and subsequently from the second temporary shape (TF) into the permanent shape (PF).

Method for restoring an article comprising a shape memory composite material

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Berlin, Germany

Marc Behl