Method for preparing star-shaped biodegradable shape-memory-polymer nano composite material
A technology of nanocomposite materials and memory polymers, which is applied in the field of preparation of star-shaped biodegradable shape memory polymer nanocomposites, can solve the problems of unsatisfactory repeated memory effect, insufficient mechanical strength, and small shape recovery force. Achieve the effects of repeatable biodegradability, strong deformation retention and high shape recovery rate
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[0023] Example 1
[0024] Put 1.8L methanol, 79.5g (3-chloropropyl)trimethoxysilane, 90ml hydrochloric acid in a 2.5L beaker, stir at room temperature for 5 weeks, filter to obtain white powder, wash with deionized water and dry to obtain POSS -(Cl) 8 . Add 4.71g AgNO to a 100ml round bottom flask 3 , Add 30ml deionized water to dissolve it. Under vigorous stirring, an aqueous solution containing 1.11 g of NaOH was added to the above solution. Generate brown Ag 2 O precipitation, suction filtration, washing with deionized water three times. Add 3g POSS-(Cl) to a 250ml round bottom flask 8 ,75ml ethanol, 75ml tetrahydrofuran, above Ag 2 O was added to the solution together with 3ml of deionized water, and the system was stirred vigorously for 48 hours in a dark environment and refluxed at 74°C. Filter twice, take the clear liquid and spin-evaporate to obtain a white solid, namely POSS-(OH) 8
[0025] After recrystallizing vinyl acetate three times, 7.258g (0.0504 mol) of dried ...
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[0027] Example 2
[0028] POSS-(OH) 8 The preparation method is as in Example 1.
[0029] After recrystallization of vinyl acetate three times, 8.064g (0.056mol) of dried D,L-lactide was put into a 50ml dry round bottom flask, and 0.0414g (4.93×10 -5 mol) POSS-(OH) 8 , 15μl stannous octoate (0.001mol / L). Polymerize for 24 hours at 130°C and under nitrogen protection. After the reaction, add dichloromethane to dissolve, then add ice to n-hexane to precipitate and purify the product, and vacuum dry to obtain a white flocculent polymer. The molecular weight is 128,000. Dissolve 1.396g of the white flocculent polymer obtained in 14ml of anhydrous dichloromethane, add 0.0875g of polytetramethylene ether glycol, and add 0.0166g of 1,6-hexamethylene diisocyanate after it is completely dissolved And 0.01 wt% chain extension catalyst stannous octoate. Stir at room temperature for 4h, pour into PTFE mold, room temperature, N 2 The solvent was volatilized under protection for 24 hours, a...
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[0030] Example 3
[0031] POSS-(OH) 8 The preparation method is as in Example 1.
[0032] After recrystallization of vinyl acetate three times, the dried D,L-lactide 7.98g (0.055mol) was put into a 50ml dry round bottom flask, and 0.0258g (3.08×10 -5 mol) POSS-(OH) 8 , 15μl stannous octoate (0.001mol / L). Polymerize for 24 hours at 130°C and under nitrogen protection. After the reaction, add dichloromethane to dissolve, then add ice to n-hexane to precipitate and purify the product, and vacuum dry to obtain a white flocculent polymer. The molecular weight is 244,000. Dissolve 1.44g of the white flocculent polymer obtained in 14ml of anhydrous dichloromethane, add 0.0472g of polytetramethylene ether glycol, add 0.0089g of 1,6-hexamethylene diisocyanate after it is completely dissolved And 0.01 wt% chain extension catalyst stannous octoate. Stir at room temperature for 4h, pour into PTFE mold, room temperature, N 2 The solvent was volatilized under protection for 24 hours, and th...
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