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Shape memory polyurethane or polyurethane-urea polymers
Shape memory polyurethane or polyurethane-urea polymers
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机译:形状记忆聚氨酯或聚氨酯-脲聚合物
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摘要
A shape memory polyurethane or polyurethane-urea polymer including a reaction product of: (A) (a) silicon-based macrodiol, silicon-based macrodiamine and/or polyether of the formula (I): A—[(CH2)m—O]n—(CH2)m—A′, wherein A and A are endcapping groups; m is an integer of 6 or more; and n is an integer of 1 or greater; (b) a diisocyanate; and (c) a chain extender; or (B) (b) a diisocyanate: and (c) a chain extender, said polymer having a glass transition temperature which enables the polymer to be formed into a first shape at a temperature higher than the glass transition temperature and maintained in said first shape when the polymer is cooled to a temperature lower than the glass transition temperature, said polymer then being capable of resuming its original shape on heating to a temperature higher than the glass transition temperature. The present invention also relates to a shape memory composition which includes a blend of two or more of the shape memory polyurethane or polyurethane-urea polymers defined above or at least one shape memory polyurethane or polyurethane-urea polymer defined above in combination with another material. The present invention further relates to processes for preparing materials having improved mechanical properties, clarity, processability, biostability and/or degradation resistance and devices or articles containing the shape memory polyurethane or polyurethane-urea polymer and/or composition defined above.
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机译:一种形状记忆聚氨酯或聚氨酯-脲聚合物,包括以下反应产物:(A)(a)硅基大分子二醇,硅基大分子二胺和/或式(I)的聚醚:A-[(CH Sub 2 Sub>) m Sub> -O] n Sub>-(CH 2 Sub>) m Sub> -A',其中A A为封端基团; m为6以上的整数。 n为1以上的整数; (b)二异氰酸酯; (c)扩链剂;或(B)(b)二异氰酸酯:和(c)扩链剂,所述聚合物具有玻璃化转变温度,其使得该聚合物能够在高于玻璃化转变温度的温度下形成第一形状并保持在所述第一形状中。当将聚合物冷却至低于玻璃化转变温度的温度时,其形状为“ H”形,则当加热至高于玻璃化转变温度的温度时,所述聚合物能够恢复其原始形状。本发明还涉及一种形状记忆组合物,其包含两种或更多种以上定义的形状记忆聚氨酯或聚氨酯-脲聚合物或至少一种以上定义的形状记忆聚氨酯或聚氨酯-脲聚合物与另一种材料的混合物。本发明进一步涉及制备具有改善的机械性能,透明度,加工性,生物稳定性和/或抗降解性的材料的方法,以及含有上述形状记忆聚氨酯或聚氨酯-脲聚合物和/或组合物的装置或制品。
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