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
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[0040] Such as figure 1 As shown, the embodiment of the present invention provides a method for preparing a spiropyran-containing photo-induced shape memory color-changing polymer, which includes the following steps:
[0041] Step S1, reacting polyether polyol or polyester polyol with diisocyanate to obtain isocyanate-terminated prepolymer 1;
[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 polymer containing spiropyran.
[0044] Preferably, the molar ratio of the polyether polyol or polyester polyol to the diisocyanate in step S1 is 1:2-3, which can make the polyether polyol or polyester polyol and the diisocyanate fully react to obtain an isocyanate The end-capped prepolymer 1 has sufficient raw material reaction to avoid raw material waste.
[0045] Preferably, in step S2, 0.5-2 moles of a chain extender is ...
Example Embodiment
[0069] Example 1
[0070] Such as figure 2 with Image 6 As shown, this embodiment provides a method for preparing a spiropyran-containing photo-induced shape memory color-changing polymer, which includes the following steps:
[0071] Step S1, add 10-30g polytetrahydrofuran ether glycol (PTMEG) and 10-30g N,N-methylene formamide (DMF) in a dry three-necked flask, then overlap the experimental device, and pass nitrogen and For condensed water, adjust the stirrer speed to 250r / min. Slowly add 5-20g diphenylmethane-4,4,-diisocyanate (MDI) dropwise within 5min, stir for 15min, add 5% dibutyltin dilaurate (DBTDL), raise the oil bath to 50-80℃, continue After reacting for 1-2h, the isocyanate-terminated prepolymer 1 is obtained, named PTMEG-MDI; among them, polytetrahydrofuran ether glycol (PTMEG) can be polytetrahydrofuran ether glycol (PTMEG-2000), polytetrahydrofuran ether glycol ( PTMEG-3000), polytetrahydrofuran ether glycol (PTMEG-4000) or polytetrahydrofuran ether glycol (PTMEG...
Example Embodiment
[0074] Example 2
[0075] The difference between this embodiment and Embodiment 1 is:
[0076] In step S1, diphenylmethane-4,4,-diisocyanate (MDI) can be used toluene diisocyanate (TDI), 1,6-hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), benzene Replacement 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 with 1,6-hexanediol, diethylene glycol, neopentyl glycol, sorbitol or diethylaminoethanol;
[0078] Among them, the catalyst dibutyl tin dilaurate (DBTDL) can be substituted with stannous octoate, lead octoate, cobalt octoate, iron octoate, organic bismuth or organic tin.
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