Helmholtz-Zentrum Geesthacht Zentrum Fur Material Und Kustenforschung Gmbh

Helmholtz-Zentrum Geesthacht Zentrum Fuer Material- Und Kuestenforschung Gmbh

Mnemoscience Gmbh

Gkss-Forschungszentrum Geesthacht Gmbh

Charité – Universitätsmedizin Berlin

Helmholtz-Zentrum Hereon Gmbh

Karl Kratz

Andreas Lendlein

Marc Behl

Tilman Sauter

Ulrich Noechel

Srinivasa Reddy Chaganti

Petra Reinke

Thomas Weigel

Annette Schmidt

Karola Lützow

Friedrich Jung

Frank Klein

Quanchao Zhang

Wolfgang Wagermaier

Birgit Schnitter

Narendra Kumar Uttamchand

Bernhard Hiebl

Jürgen Schulte

Joerg Zotzmann

Andreas Kurtz

Andy R•mhild

Reinhard Mohr

Ulrike Voigt

Peter Simon

Jörg Zotzmann

Ulrich NÖCHEL

Frank Andreas Klein

Andy Römhild

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 present invention relates to a method for testing different selected materials and/or surface structures for the culture of cells and/or microorganisms.

Method and kit for testing various selected materials and/or surface structures for culturing cells

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

The invention relates to a method for programming a shape memory polymer, which comprises at least one switching segment having at least one thermal phase transition and covalent and/or non-covalent cross-linking points such that the shape memory polymer after the programming thereof is in a position to transition from a programmed temporary shape into the permanent shape thereof, following a temperature increase to a temperature that at least corresponds to a switching temperature (T, T). According to the invention, the method comprises (a) predetermining a programming temperature (t) as a function of a desired switching temperature (T, T), (b) heating the shape memory polymer to the predetermined programming temperature (t), and transferring the polymer into a shape that corresponds to the temporary shape by applying a forced molding state, and (c) cooling the polymer to a temperature below the desired switching temperature (T, T) while maintaining the forced molding state.

Method for programming a shape memory polymer while defining the switch temperature by selection of the programming temperature

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

The present invention relates to polyester urethanes comprising polypentadecalactone segments. These polyester urethanes do show good properties which may be adjusted in a controlled manner. In preferred embodiments the polyester urethanes display additionally polycaprolactone segments. Such polymer may show shape memory effects.

Polyester urethanes

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Berlin, Germany

Karl Kratz