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douzhanshengfo

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[交流] 【求助】做过温敏水凝胶的请进已有7人参与

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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wmx

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yusen_1982(金币+1):欢迎讨论!!!!! 2010-04-07 15:15
测相转变温度
2楼2010-04-07 12:27:26
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firebolt

铁杆木虫 (著名写手)


yusen_1982(金币+1):欢迎讨论!!!!! 2010-04-07 15:15
用UV-Vis测不同温度下的透光率,找到转变温度,平衡15min,跟你的凝胶特点有关,自己摸索
3楼2010-04-07 13:32:51
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placopolymer

金虫 (职业作家)

岱罡生物聚乳酸及共聚物研究



yusen_1982(金币+1):欢迎讨论!!!!! 2010-04-09 09:18
我们做聚乳酸温敏水凝胶,相变温度是25-28度,在体温下是凝胶状态,我们是通过倒置法来观察的。
4楼2010-04-08 21:42:49
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bighead7288

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大将军

douzhanshengfo(金币+1):thanks 2010-04-10 09:02
在不同的温度下做溶胀测试,分别测定其溶胀平衡后的质量
5楼2010-04-09 14:28:32
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tayin

木虫 (正式写手)

douzhanshengfo(金币+1):thanks 2010-04-10 09:02
UV紫外測浊度
DS測失水峰
均可测定相转变温度
6楼2010-04-09 16:47:45
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wangzhichu

金虫 (初入文坛)

douzhanshengfo(金币+1):thanks 2010-04-10 09:02
我看到的许多文献上是作粘度-温度图像,温度变化的过程中,粘度会有突变的。
7楼2010-04-09 20:43:08
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277180327

木虫 (正式写手)

我做过

★ ★ ★
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
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.
f(x)?
8楼2011-01-13 11:32:51
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baitao8888

木虫 (正式写手)


yusen_1982(金币+1):欢迎讨论! 2011-01-14 16:50:41
DCS, DMA可以表征。不过我们都是用UV测的浊点。
9楼2011-01-13 21:09:43
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baitao8888

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yusen_1982(金币+1):欢迎讨论! 2011-01-14 16:50:31
几分钟内达到平衡
10楼2011-01-13 21:10:14
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