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lliuzhi金虫 (正式写手)
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[求助]
H103和NKA-II树脂合成方法
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| 请问H103和NKA-II树脂苯乙烯以何种方式聚合得到，包括引发剂、交联剂、分散剂 |
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- 【求助】 酚醛树脂合成方法
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【答案】应助回帖
★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★
感谢参与，应助指数 +1
lliuzhi: 金币+30, ★★★很有帮助, 感谢应贴 2013-03-08 09:33:25
感谢参与，应助指数 +1
lliuzhi: 金币+30, ★★★很有帮助, 感谢应贴 2013-03-08 09:33:25
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2楼2013-03-07 13:41:37
【答案】应助回帖
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(Suspension Copolymerization) A 2 L separable flask equipped with a condenser, a stirrer and a nitrogen inlet tube was set on a constant temperature water bath, polyvinyl alcohol (48 g, manufactured by Wako Pure Chemical Industries, Ltd., average degree of polymerization about 500) and distilled water (1600 g) were placed therein and stirred at 400 rpm. While respectively flowing cooling water and nitrogen gas, the stirring was continued at a constant temperature water bath temperature of 55° C. to dissolve polyvinyl alcohol. Separately, styrene (80 g, manufactured by Wako Pure Chemical Industries, Ltd.), p-acetoxystyrene (7 g, manufactured by Aldrich), divinylbenzene (7.5 g, manufactured by Wako Pure Chemical Industries, Ltd.), 2-ethylhexanol (70 g, manufactured by Wako Pure Chemical Industries, Ltd.), isooctane (30 g, manufactured by Wako Pure Chemical Industries, Ltd.), dibenzoylperoxide (1.8 g, manufactured by NOF Corporation, containing water by 25%) and n-dodecylmercaptan (0.1 g, manufactured by Wako Pure Chemical Industries, Ltd.) were added, mixed and dissolved, and this solution was placed in the above-mentioned separable flask. While stirring under a nitrogen stream at peripheral velocity of 2.0 m/s, the temperature was raised from room temperature to 80° C. to conduct suspension copolymerization for 24 hr. (Washing) The polymerization product was washed by filtration using distilled water and acetone (manufactured by Wako Pure Chemical Industries, Ltd.) to allow dispersion in acetone to the total amount of about 2 L. This was further dispersed using an ultrasonic homogenizer and further washed by filtration using distilled water and acetone to allow dispersion in acetone to the total amount of about 1 L. (Classification) This dispersion was stood still until beads-like copolymer precipitated and the precipitate was not disturbed even when the dispersion was tilted, and the supernatant (acetone) was disposed. Acetone was again added to the precipitate to the total amount of about 1 L, the mixture was stood still, and acetone was disposed, which operation was repeated 12 times to allow for classification. The dispersion was filtered and vacuum dried to give a styrene-acetoxystyrene-divinylbenzene copolymer as a powder. (Hydrolysis) The above-mentioned styrene-acetoxystyrene-divinylbenzene copolymer (70 g) and tetrahydrofuran (467 g, manufactured by Wako Pure Chemical Industries, Ltd.) were placed in a 1 L separable flask and the mixture was stirred at 200 rpm. While respectively flowing cooling water and nitrogen gas, the stirring was continued at a constant temperature water bath temperature of 50° C. to allow dispersion. Thereto was added hydrazine monohydrate (105 g, manufactured by Wako Pure Chemical Industries, Ltd.) and the copolymer was hydrolyzed for 15 hr. The reaction mixture was neutralized with hydrochloric acid and the polymerization product was washed by filtration using distilled water and acetone. The product was dispersed in acetone to the total amount of about 1 L, and the dispersion was filtered and vacuum dried to give a porous resin bead comprising a powdery styrene-hydroxystyrene-divinylbenzene copolymer. |
3楼2013-03-07 13:58:20