Light polymerization process for preparing block or graft polymer
A technology of graft polymer and photopolymerization, which is applied in the field of free radical polymerization of thioxanthone and its derivatives by visible light irradiation, can solve the problems of damage to biological substrates, and achieve the effect of easy acquisition and low cost
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Embodiment 1
[0039] Add 5ml of methyl methacrylate, 0.0254g of isopropyl thioxanthone, 0.0193g of p-(dimethylamino) ethyl benzoate and 5 milliliters of ethyl acetate into a reaction flask with a quartz cap and mix them. Nitrogen, evacuated to remove oxygen, and placed under a xenon lamp for 6 hours. Precipitate with methanol to obtain polymethyl methacrylate, and dissolve it with ethyl acetate for four times to remove residual isopropylthioxanthone.
[0040] Dissolve 0.05 g of the polymer obtained in step 1 in 2.5 ml of glycidyl methacrylate and 7.5 ml of ethyl acetate, add to the reaction bottle, pass through nitrogen, vacuumize and remove oxygen, and place under a xenon lamp (power 500W, add a filter , by light with a wavelength of 380nm to 760nm), the reaction mixture is sampled within a certain period of time, methanol is precipitated, dried, and the molecular weight and molecular weight distribution are measured. Detailed results are shown in Table 1.
[0041] Table 1 Polymethyl met...
Embodiment 2
[0045] Add 5ml of methyl methacrylate, 0.3g of isopropyl thioxanthone, 0.23g of p-(dimethylamino) ethyl benzoate and 5 ml of ethyl acetate into a reaction flask with a quartz cap and mix them. Nitrogen, evacuated to remove oxygen, and placed under a xenon lamp for 4.5 hours. Precipitate with methanol to obtain polymethyl methacrylate, and dissolve it with ethyl acetate for four times to remove residual isopropylthioxanthone.
[0046] Dissolve 0.05 g of the polymer obtained in step 1 in 5 ml of glycidyl methacrylate, add it to the reaction bottle, pass nitrogen, vacuumize and deoxygenate, and place it under a xenon lamp (power 500W, add a filter, and the passing wavelength is 380nm to 760nm) Illumination, the reaction mixture is sampled within a certain period of time, precipitated with methanol, dried, and the molecular weight and molecular weight distribution are measured. Detailed results are shown in Table 2.
[0047] Table 2 Polymethyl methacrylate-b-polyglycidyl methacr...
Embodiment 3
[0051] Add 5ml of methyl methacrylate, 2.032g of isopropyl thioxanthone, 1.544g of p-(dimethylamino) ethyl benzoate and 5 milliliters of ethyl acetate into a reaction flask with a quartz cap and mix them. Nitrogen, evacuated to remove oxygen, and placed under a xenon lamp for 3 hours. Precipitate with methanol to obtain polymethyl methacrylate, and dissolve it with ethyl acetate for four times to remove residual isopropylthioxanthone.
[0052] Dissolve 0.05 g of the polymer obtained in step 1 in 7.5 ml of glycidyl methacrylate and 2.5 ml of ethyl acetate, add to the reaction bottle, pass through nitrogen, vacuumize and remove oxygen, and place under a xenon lamp (power 500W, add a filter , by light with a wavelength of 380nm to 760nm), the reaction mixture is sampled within a certain period of time, methanol is precipitated, dried, and the molecular weight and molecular weight distribution are measured. Detailed results are shown in Table 3.
[0053] Table 3 polymethyl metha...
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