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Shape memory polymers

A polymer, thermoplastic polymer technology, used in sensors, hearing aids, electrical components, etc., to solve problems such as poor recovery, low fixation rate, and limitations

Inactive Publication Date: 2020-10-16
アドルフメークルインスティチュートユニバーシティーオブフリブール
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Certain limitations such as low stiffness, 17-19 low resilience, 20 long response time, 21 Limited shape memory behavior durability, 22-23 or complex synthesis limits their potential technological applications
Other problems include low fixity, poor recovery, or inappropriate requirements for fixation and release conditions

Method used

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Examples

Experimental program
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Embodiment Construction

[0058] Material. Based on a hard segment composed of 4,4-methylenebis(phenylisocyanate) (4,4-methylenebis(phenylisocyanate), MDI) and 1,4-butanediol (BD) as a chain extender and poly 1 , 4-butadiene adipate (PBA) and polytetrahydrofuran (PTHF) soft / transition segment PBA-PU and PTHF-PU were developed by Covestro Deutschland AG and Bayer MaterialScience (now Covestro Xtron) are offered as Desmopan DP 2795A and Texin 285 respectively. Poly-1,4-butadiene adipate (PBA) (M w =12000 g / mol) was purchased from Sigma Aldrich (SigmaAldrich) or from Best of Chemicals from BOC Sciences, Shirley, USA, Shirley, USA, and polycaprolactone (PCL, M w = 14000 g / mol, M n = 12000 g / mol) was purchased from Sigma-Aldrich. Acetylated PBA was prepared by reacting PBA with acetyl chloride in tetrahydrofuran / pyrimidine.

[0059] Blends of PBA-PU or PTHF-PU with PBA or AcPBA were prepared. PBA-PU and PTHF-PU were dried in an oven at 70° C. for 3 hours before preparing the blends. The PBA-PU is mel...

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Abstract

Shape memory polymers allow the fabrication of objects that have a permanent (first) shape, and which can be programmed to adopt a temporary (second) shape, and are able to largely recover their original (first) shape by applying an appropriate stimulus. Materials that permit the fabrication of objects and devices that can (i) be provided in their permanent shape, (ii) be heated to a switching temperature above physiological temperature, at which the material becomes shapeable, (iii) be inserted into the body or placed in contact with the body and be deformed or shaped to assume a desired temporary shape, (iv) be fixed in the desired temporary shape by keeping the material / device / object at body temperature (about 37 DEG C) for a convenient period of time, (v) largely retain this temporaryshape if removed from the body, and (vi) return largely to their original shape when heated again above the switching temperature. A process for making such materials and disclosed products based on such materials are disclosed.

Description

technical field [0001] Shape memory polymers enable the production of objects that have a permanent (first) shape that can be programmed to take a temporary (second) shape and that can be made larger by applying an appropriate stimulus. recovers its original (first) shape to a certain extent. One area of ​​application for shape memory polymers is in biomedical applications such as self-expanding devices for minimally invasive surgery or self-tying sutures. Most existing shape memory materials used in biomedical applications are designed to enable objects to be applied in a temporary shape, with the aim of releasing them using either an increase in temperature (provided by the body or external heating) or physiological fluids (or both). A stimulus to release or "trigger" to restore a permanent shape in or around the body. The present invention relates to materials that enable the inversion of this approach and allow the production of objects and devices that: (i) can be provi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/42
CPCC08G18/4238C08G18/4277C08G2280/00C08J3/005C08J2367/02C08J2367/04C08J2375/06C08J2467/02C08J2467/04C08J2475/06C08L67/02C08L67/04C08L75/06C08L2207/04H04R25/652H04R31/00
Inventor 克里斯托弗·韦德阿奴哈·斯柔卡洛·贝罗特茱莉娅·隆斯基康斯坦丁·希尔伯灿
Owner アドルフメークルインスティチュートユニバーシティーオブフリブール
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