Thermotropic crosslinking type shape memory polyurethane material and preparation method thereof

A thermoplastic polyurethane and cross-linking technology, which is applied in the field of thermotropic shape memory polymer materials and their preparation, can solve the problems of low degree of cross-linking, non-uniformity, influence on ray transmittance, etc., and achieves easy control and cross-linking. High degree of effect with uniform degree of crosslinking

Active Publication Date: 2015-06-17
眉山尤博瑞新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this regard, K. Hearon et al. (Journal of Applied Polymer Science, 121(2011), 144–153) used radiation to crosslink thermoplastic polyurethanes containing 1,4-butenediol chain extension to obtain crosslinked shape memory polyurethanes. , but in addition to using special electron or cobalt source irradiation equipment, radiation crosslinking has strict requirements on the thickness and

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Stir and mix 56 parts of polycaprolactone diol with a number average molecular weight of 1000, 19 parts of 1,6-hexamethylene diisocyanate and 0.01 part of organic bismuth and prepolymerize at 75°C for 3 hours, then Add 10 parts of trimethylolpropane monoallyl ether to extend the chain at 55°C for 2 hours, and finally raise the temperature to 80°C for 3 hours to obtain thermoplastic polyurethane with side chain double bonds;

[0032] (2) First mix 85 parts of thermoplastic polyurethane with side chain double bonds, 15 parts of polyethylene glycol diacrylate, and 1 part of benzoyl peroxide, and then cross-link at the initiation temperature for 10 hours to obtain a cross-linked shape Memory polyurethane.

[0033] The obtained cross-linked shape memory polyurethane film has a shape fixation rate of 95% and a shape recovery rate of 90% in bending mode; a dynamic mechanical analysis has a shape fixation rate of 95% and a shape recovery rate of 90% in tensile mode.

Embodiment 2

[0035] (1) Stir and mix 42 parts of polylactic acid diol with a number average molecular weight of 1000, 21 parts of isophorone diisocyanate and 0.01 part of organotin and prepolymerize at 85°C for 2 hours, then add 15 parts of 3-allyl Oxy-1,2-propanediol chain extension at 65°C for 1 hour, and finally heating up to 90°C for 2 hours to obtain thermoplastic polyurethane with side chain double bonds;

[0036] (2) First, 78 parts of thermoplastic polyurethane with side chain double bonds, 22 parts of polypropylene glycol diacrylate, and 2 parts of azobisisobutylcyanide are added to N,N-dimethylacetamide to form a concentration of 30% by mass. solution, and then cross-linked at the initiation temperature for 8 hours to obtain cross-linked shape memory polyurethane.

[0037] The obtained cross-linked shape-memory polyurethane film has a shape fixation rate of 97% and a shape recovery rate of 91% in bending mode; a dynamic mechanical analysis has a shape fixation rate of 97% and a s...

Embodiment 3

[0039] (1) Stir and mix 21 parts of polyglycolide diol with a number average molecular weight of 1000, 25 parts of cyclohexane-1,4-diisocyanate and 0.01 part of dibutyltin laurate and prepolymerize at 80°C for 2 hours, then Add 22 parts of 7-octene-1,2-diol to extend the chain at 60°C for 2 hours, and finally raise the temperature to 80°C for 3 hours to obtain thermoplastic polyurethane with side chain double bonds;

[0040] (2) First add 68 parts of thermoplastic polyurethane with side chain double bonds, 32 parts of polypropylene glycol dimethacrylate, and 2 parts of peroxylauric acid into N,N-dimethylacetamide to form a mass percentage concentration of 20%. solution, and then cross-linked at the initiation temperature for 10 hours to obtain cross-linked shape memory polyurethane.

[0041] The obtained cross-linked shape memory polyurethane film has a shape fixation rate of 95% and a shape recovery rate of 95% in bending mode; a dynamic mechanical analysis has a shape fixati...

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PUM

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Abstract

The invention discloses a thermotropic crosslinking type shape memory polyurethane material obtained by thermal crosslinking of thermoplastic polyurethane with a side-chain double bond, a bifunctional crosslinking agent and an initiator; in a bending mode, the shape fixed rate is more than or equal to 95%, and the shape recovery rate is more than or equal to 90%; in a dynamic mechanical analysis tensile mode, the shape fixed rate is more than or equal to 95%, and the shape recovery rate is more than or equal to 90%. A preparation method disclosed by the invention is a second-step method and comprises the steps: firstly preparing the thermoplastic polyurethane with the side-chain double bond, then carrying out melting mixing or solution mixing with the bifunctional crosslinking agent under a condition with addition of the initiator, and carrying out thermal crosslinking to prepare the product. The polyurethane material disclosed by the invention has excellent shape memory properties and mechanical properties, the transition temperature is close to a body temperature, and the raw materials have good biological compatibility and no toxicity and can be degraded; the polyurethane material can be used as in-vivo implant materials and clinical surgical materials, also can be used for wire and cable casings and building pipe connecting sleeves, moreover, can be used for buffer sole protection devices, deformation toys and the like, and is suitable for large-scale industrialized production.

Description

technical field [0001] The invention belongs to the technical field of thermotropic shape-memory polymer material and its preparation, and in particular relates to a thermotropic cross-linked shape-memory polyurethane material and a preparation method thereof. Background technique [0002] Shape memory polymers (Shape Memory Polymers, SMPs), as a new type of stimuli-responsive polymer materials, have attracted extensive attention of researchers in recent years. This kind of SMPs, which has the ability to change its shape under the action of external stimuli, is gradually expected to become an effective substitute for shape memory alloys (Shape Memory Alloys, SMA). The temperature is wide and easy to adjust, the recovery rate is high, the cycle is good, the weight is light and cheap, and the processing is convenient. It can be widely used in aerospace, engineering, medical and other fields, as well as residents' daily necessities. [0003] Shape memory polyurethanes (Shape M...

Claims

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Application Information

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IPC IPC(8): C08F283/00C08G18/67C08G18/66C08G18/42C08G18/10C08J3/24
Inventor 谭鸿赵云李洁华傅强
Owner 眉山尤博瑞新材料有限公司
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