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douzhanshengfo铜虫 (正式写手)
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【求助】做过温敏水凝胶的请进 已有7人参与
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| 哪位大侠制备过温敏水凝胶，请问水凝胶的温敏性是如何测量的，一般达到平衡要多长时间？ |
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yusen_1982(金币+1):欢迎讨论！ 2011-01-14 16:50:50
americanyk(金币+2): Thank you 2011-02-21 17:28:20
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americanyk(金币+2): Thank you 2011-02-21 17:28:20
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The polymeric micelle solutions were stored at a low temperature to equilibrate for 30 min before the ultraviolet (UV) measurements (UV-2550, Shimadu, Japan). The experimental temperature range was 25–50°C in increments of 2° C. At least 20 min was allowed for the temperature equilibration of the sample. The opaque temperature was determined as the onset point of the abrupt increase in theUV absorption, and the precipitate temperature was determined when the precipitate of the solution was formed. The LCST of the polymer solution was defined as the temperatureproducing a half increase of the total increase in optical absorbance (25). The sol (flow)–gel (no flow) transition behaviors of the terpolymers in aqueous solution were investigated by the tube tilting method, with a temperature increment of 2°C. The sol-to-gel transition behaviors of the polymer aqueous solution were further investigated by Bohlin Gemini 200 (Malvern Instuments Ltd., Malvern, U.K.). The polymer aqueous solution was placed between parallel plates with 25 mm iameter and 0.5 mm of a gap. The data were collected under a controlled stress (4.0 dyn/cm2 ) and a frequency of 1.0 rad/s. The heating rate was 1°C/min. |
8楼2011-01-13 11:32:51
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3楼2010-04-07 13:32:51
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4楼2010-04-08 21:42:49
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5楼2010-04-09 14:28:32
