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Spiropyrane-containing photoinduced shape memory discoloration polymer and preparation method thereof

A photoinduced shape memory and spiropyran technology, applied in the field of functional polymer preparation, can solve the problems of biological tissue damage, limit the application range of shape memory materials, limit the application range, etc., and achieve the effect of good shape fixation rate

Active Publication Date: 2020-06-12
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, heat-responsive SMP is the most researched, but in some practical applications, such as biomedical materials, excessive temperature will cause irreversible damage to biological tissues, which limits the application range of shape memory materials, so thermal Stimulation is not a good way to induce
[0003] At present, the vast majority of photoinduced shape memory polymers rely on the photochemical reaction of cinnamic acid groups or azobenzenes, or through the photothermal effect of photothermal materials such as graphene oxide and gold nanoparticles to achieve photoinduced shape memory effects. In special fields, such as camouflage robots, etc., the heat generated by materials is easily captured by infrared, which limits its application range

Method used

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  • Spiropyrane-containing photoinduced shape memory discoloration polymer and preparation method thereof
  • Spiropyrane-containing photoinduced shape memory discoloration polymer and preparation method thereof
  • Spiropyrane-containing photoinduced shape memory discoloration polymer and preparation method thereof

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preparation example Construction

[0040] Such as figure 1 As shown, the embodiment of the present invention provides a preparation method of a photo-induced shape memory color-changing polymer containing spiropyran, comprising the following steps:

[0041] Step S1, reacting polyether polyol or polyester polyol with diisocyanate to obtain a prepolymer 1 terminated with isocyanate;

[0042] Step S2, adding a chain extender to the prepolymer 1 to perform a chain extension reaction to obtain a polyurethane polymer;

[0043] Step S3, reacting the polyurethane polymer with spiropyran to obtain a photochromic shape memory polymer containing spiropyran.

[0044] Preferably, the molar ratio of polyether polyol or polyester polyol and diisocyanate described in step S1 is 1:2-3, can make polyether polyol or polyester polyol and diisocyanate fully react, obtain isocyanate End-capped prepolymer 1, raw materials react fully, avoiding waste of raw materials.

[0045] Preferably, in step S2, 0.5-2 moles of a chain extender a...

Embodiment 1

[0070] Such as figure 2 and Figure 6 As shown, this embodiment provides a preparation method of a photo-induced shape-memory color-changing polymer containing spiropyran, comprising the following steps:

[0071] Step S1, add 10-30g of polytetrahydrofuran ether glycol (PTMEG) and 10-30g of N,N-methyleneformamide (DMF) successively in a dry three-necked flask, then lap the experimental device, and pass nitrogen and Condensed water, adjust the stirrer speed to 250r / min. Slowly add 5-20g of diphenylmethane-4,4,-diisocyanate (MDI) dropwise within 5 minutes, add 5% dibutyltin dilaurate (DBTDL) after stirring for 15 minutes, raise the temperature of the oil bath to 50-80°C, continue React for 1-2h to obtain the prepolymer 1 terminated with isocyanate, named as PTMEG-MDI; wherein, polytetrahydrofuran ether glycol (PTMEG) can be polytetrahydrofuran ether glycol (PTMEG-2000), polytetrahydrofuran ether glycol ( PTMEG-3000), polytetrahydrofuran ether glycol (PTMEG-4000) or polytetrah...

Embodiment 2

[0075] The difference between this embodiment and embodiment 1 is:

[0076] In step S1, diphenylmethane-4,4,-diisocyanate (MDI) can use toluene diisocyanate (TDI), 1,6-hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), benzene Substitution of dimethylene diisocyanate (XDI), naphthalene-1,5-diisocyanate (NDI), methylcyclohexyl diisocyanate (HTDI) or dicyclohexylmethane diisocyanate (HMDI);

[0077] In step S2, 1,4-butanediol can be replaced by 1,6-hexanediol, diethylene glycol, neopentyl glycol, sorbitol or diethylaminoethanol;

[0078] Wherein, the catalyst dibutyltin dilaurate (DBTDL) can be replaced by stannous octoate, lead octoate, cobalt octoate, iron octoate, organic bismuth or organic tin.

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Abstract

The invention provides a spiropyrane-containing photoinduced shape memory discoloration polymer and a preparation method thereof, and belongs to the technical field of functional polymer preparation.The preparation method of the spiropyrane-containing photoinduced shape memory discoloration polymer comprises the following steps: reacting polyether polyol or polyester polyol with diisocyanate to obtain an isocyanate-terminated prepolymer 1; adding a chain extender into the prepolymer 1, and carrying out a chain extension reaction to obtain a polyurethane polymer; and reacting the polyurethanepolymer with spiropyrane to obtain the spiropyrane-containing photoinduced shape memory discoloration polymer. The spiropyrane-containing photoinduced shape memory discoloration polymer gives consideration to a photoinduced shape memory effect and a photoinduced discoloration effect, i.e., the spiropyrane-containing photoinduced shape memory discoloration polymer has very good shape fixing rate, shape recovery rate and discoloration rate, and can be widely applied to the fields of information storage, counterfeiting prevention, flexible camouflage robots and the like.

Description

technical field [0001] The invention relates to the technical field of preparation of functional polymers, in particular to a photoinduced shape-memory color-changing polymer containing spiropyran and a preparation method thereof. Background technique [0002] Shape memory polymers (SMPs) are a class of stimuli-responsive smart materials with shape memory effects. When subjected to external stimuli, such as heat, light, electricity, magnetism, chemical solvents, etc., the material can return to the original shape from the temporarily shaped state, and is widely used in aerospace, biomedicine, and sensing and braking fields. There are many kinds of shape memory polymer materials, which can be divided into thermotropic, electrotropic, phototropic, magnetotropic and chemical responsive according to different stimuli responses. At present, heat-responsive SMP is the most researched, but in some practical applications, such as biomedical materials, excessive temperature will cau...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/66C08G18/48C08G18/10C08G18/32C09K9/02
CPCC08G18/7671C08G18/4854C08G18/10C09K9/02C08G2280/00C09K2211/1475C08G18/3206C08G18/3844
Inventor 冷劲松王晓飞刘彦菊何阳
Owner HARBIN INST OF TECH
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