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Shape memory polymer with polyester and polyether segments and process for its preparation and programming

A memory polymer, polymer technology, used in drug delivery, pharmaceutical formulations, prostheses, etc., can solve the problems of bioincompatibility, non-reabsorption, and transition temperature of decomposition products

Inactive Publication Date: 2012-07-18
GKSS FORSCHUNGSZENTRUM GEESTHACHT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A disadvantage of known shape-memory polymers is that their transition temperatures lie outside the physiologically tolerable range and / or that they cannot be resorbed, or that they or their decomposition products are not biocompatible

Method used

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  • Shape memory polymer with polyester and polyether segments and process for its preparation and programming
  • Shape memory polymer with polyester and polyether segments and process for its preparation and programming
  • Shape memory polymer with polyester and polyether segments and process for its preparation and programming

Examples

Experimental program
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Embodiment Construction

[0046] 1. Synthesis of poly(ε-caprolactone) dimethacrylate PCL10kDMA:

[0047] 500 g (50 mmol) of poly(ε-caprolactone) diol (Aldrich, PCL10k diol) with an average molecular weight of 10000 g / mol was placed in 5 L of dichloromethane in a dry 3-necked flask under nitrogen atmosphere. 20.0 mL (0.14 mol) of triethylamine was added dropwise while cooling with ice. After stirring at 0° C. for 10 minutes, 17.4 mL (0.18 mol) of methacryloyl chloride was added dropwise. The solution was warmed to room temperature and stirred for an additional 24 hours. Precipitated salts were removed by filtration. The filtrate was concentrated and dissolved in ethyl acetate. The solution was precipitated in a 10-fold excess of a mixture of hexane / diethyl ether / methanol (18:1:1 by volume) at -20°C. After drying in vacuo, 475 g (47 mmol) of poly(ε-caprolactone) dimethacrylate PCLMDA (PCL10kDMA) having the formula Ic (see above) with an average molecular weight of 10 kD were obtained. use 1 The f...

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Abstract

The invention relates to a shape memory polymer, to a process for its preparation, to a process for its programming and to its use. The inventive shape memory polymer has at least two switch segments with different transition temperatures (Ttrans,1, Ttrans,2), such that the polymer, depending on the temperature, as well as a permanent shape (PF), can assume at least two temporary shapes (TF1 , TF2). The first switch segment is based essentially on a polyester of the general formula (I) where n = 1...6 or a copolyester of the general formula (I) with different n or a derivative thereof. The second switch segment is based essentially on a polyether of the general formula (II) where m = 1...4 or a copolyether of the general formula II with different m or a derivative thereof.

Description

technical field [0001] The present invention relates to a shape memory polymer capable of memorizing at least two temporary shapes in addition to a permanent shape, a method for its preparation and a method for programming its shape, and its use. Background technique [0002] So-called shape-memory polymers, or SMPs, are known in the prior art which, when induced by suitable stimuli, exhibit a shape transition from a temporary to a permanent shape consistent with previous designs. Most commonly, this shape memory effect is thermally stimulated, ie when the polymer material is heated above a defined transition temperature, a resetting occurs due to entropy elasticity. In general, shape memory polymers are polymer networks in which chemical (covalent) or physical (non-covalent) crosslinks define a permanent shape. A design is achieved in that the polymeric material deforms above the transition temperature of the switching segment, and then cools below this temperature while m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/00C08G65/00
CPCC08F283/02C08G2280/00A61L2400/16C08G63/664A61L27/18C08F283/00C08G2270/00C08F283/06A61L27/50C08L71/02C08F290/061C08G65/3322C08F290/062C08L67/00C08L2666/04
Inventor 斯特芬·克尔希安德烈亚斯·伦德林英戈·贝林
Owner GKSS FORSCHUNGSZENTRUM GEESTHACHT GMBH