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douzhanshengfo銅蟲 (正式寫手)
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[交流]
【求助】做過溫敏水凝膠的請(qǐng)進(jìn) 已有7人參與
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| 哪位大俠制備過溫敏水凝膠,請(qǐng)問水凝膠的溫敏性是如何測(cè)量的,一般達(dá)到平衡要多長(zhǎng)時(shí)間? |
鐵桿木蟲 (著名寫手)
金蟲 (職業(yè)作家)
岱罡生物聚乳酸及共聚物研究
木蟲 (小有名氣)
大將軍
金蟲 (初入文壇)
木蟲 (正式寫手)
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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. |

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