Thermoplastic cellulose-based solid-solid phase transition material and preparation method thereof

[0037] The microcrystalline cellulose was dried in a vacuum oven at 40 °C for 36 h.

[0038] Toluene-2,4-diisocyanate and polyethylene glycol n-tetradecyl ether HO (CH 2 CH 2 O) 20 C 14 h 29 Dissolve in N'N-dimethylformamide respectively, prepare toluene-2,4-diisocyanate solution with a concentration of 6mol% and HO(CH with a concentration of 12mol%) 2 CH 2 O) 20 C 14 h 29 solution; then HO(CH 2 CH 2 O) 20 C 14 h 29 The solution was added into the toluene-2,4-diisocyanate solution in 3 times, toluene-2,4-diisocyanate and polyethylene glycol n-tetradecyl ether HO(CH 2 CH 2 O) 20 C 14 h 29 The molar ratio is 1:1, add the crosslinking agent (toluene-2,4-diisocyanate) mass 0.01% catalyst dioctyltin mercaptide, and react for 6h at 70°C with a stirring speed of 500r / min to obtain the pre- polymer solution.

[0039] Dissolve microcrystalline cellulose in ionic liquid 1-allyl-3-methylimidazolium chloride salt at 80°C to obtain A solution with a microcrystalline cellu

[0043] The cellulose acetate was dried in a vacuum oven at 30 °C for 48 h.

[0044] Diphenylmethane diisocyanate and polyethylene glycol n-octadecyl ether HO (CH 2 CH 2 O) 100 C 18 h 37 Diphenylmethane diisocyanate solution and 9mol% polyethylene glycol n-stearyl ether solution were dissolved in dimethyl sulfoxide to prepare a concentration of 2mol%; then HO(CH 2 CH 2 O) 100 C 18 h 37 The solution is added dropwise to the diphenylmethane diisocyanate solution, the molar ratio of diphenylmethane diisocyanate to polyethylene glycol n-octadecyl ether is 1:1, and the mass of crosslinking agent (diphenylmethane diisocyanate) is added at 2.0% The catalyst dioctyltin mercaptide was reacted for 8 hours at 60°C and the stirring speed was 600r / min to obtain a prepolymer solution.

[0045] Dissolve cellulose acetate in ionic liquid propylpyridinium chlorate at 65°C to obtain A solution with a cellulose acetate concentration of 1 wt%, and then add the prepolymer solution to A solu

[0048] The cyanoethyl cellulose was dried in a vacuum oven at room temperature for 48 h.

[0049] Methylenebisacrylamide and polyethylene glycol n-behenyl ether (HO(CH 2 CH 2 O) 2 C 22 h 45 ) was dissolved in ethylene glycol monoethyl ether to prepare a solution of methylenebisacrylamide with a concentration of 2mol% and a solution of polyethylene glycol n-docosyl ether with a concentration of 8mol%, and then the polyethylene glycol n-behenyl ether The alkyl ether solution was added into the methylene bisacrylamide solution in 10 times, the molar ratio of methylene bisacrylamide to polyethylene glycol n-docosyl ether was 1:1, and a crosslinking agent (methylene bisacrylamide Bisacrylamide) with 0.05% by weight of the catalyst dibutyltin dilaurate was reacted for 8 hours at 35°C with a stirring rate of 600r / min to obtain a prepolymer solution.

[0050] Dissolve cyanoethylcellulose into the ionic liquid 1-butyl-3-methyl-imidazolium chloride salt at 65°C to obtain a solution