Biodegradable shape memory polymers

A - Human Necessities – 61 – L

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A61L 27/00 (2006.01) A61L 27/18 (2006.01) A61L 27/50 (2006.01) A61L 27/58 (2006.01) A61L 29/00 (2006.01) A61L 29/14 (2006.01) A61L 31/00 (2006.01)

Patent

CA 2316190

Biodegradable shape memory polymer compositions, articles of manufacture thereof, and methods of preparation and use thereof are described. In one embodiment the compositions include at least one hard segment and at least one soft segment. The T trans of the hard segment is preferably between -30 and 270 °C. At least one of the haul or soft segments can contain a cross-linkable group, and the segments can be linked by formation of an interpenetrating network or a semi- interpenetrating network, or by physical interactions of the segments. Objects can be formed into a given shape at a temperature above the T trans of the hard segment, and cooled to a temperature below the T trans of the soft segment. If the object is subsequently formed into a second shape, the object can return to its original shape by heating the object above the T trans of the soft segment and below the T trans of the hard segment.

L'invention concerne des compositions polymères biodégradables à mémoire de forme, des articles fabriqués à partir desdites compositions, et des procédés d'élaboration et d'utilisation desdites compositions. Selon un mode de réalisation, les compositions comprennent au moins un segment dur et au moins un segment mou. La température de transition vitreuse (Ttrans) du segment dur se situe, de préférence, entre -30 et 270 DEG C. L'un au moins du segment dur ou du segment mou peut contenir un groupe réticulable. Les segments peuvent être liés par formation d'un alliage IPN ou semi-IPN, ou par des interactions physiques entre les segments. Des objets peuvent mis en forme à une température supérieure à la température Ttrans du segment dur, puis refroidis jusqu'à atteindre une température inférieure à la température Ttrans du segment mou. Si l'objet est ultérieurement amené à prendre une forme, il peut reprendre sa forme originale par un chauffage à une température supérieure à la température Ttrans du segment mou et inférieure à la température Ttrans du segment dur.

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