Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Engineering Research Center of Materials Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, China.
Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Engineering Research Center of Materials Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, China.
Carbohydr Polym. 2018 Sep 15;196:209-216. doi: 10.1016/j.carbpol.2018.05.039. Epub 2018 May 18.
A thermo and pH dual-responsive starch (TPDS) was successfully synthesized by etherification, in which butyl glycidyl ether (BGE) was used as the hydrophobic reagent followed by addition of 2-chloro-4, 6-diglycino-[1,3,5]-triazine (CDT) groups. The obtained materials were characterized by Fourier transform-infrared spectroscopy (FTIR), H nuclear magnetic resonance (H NMR) and elemental analysis to confirm the structure and the average substitution degree of BGE and CDT on starch molecule. It was observed that the lower critical solution temperature (LCST) of the TPDS could be modulated from 31 °C to 47 °C by increasing pH of the solution. The effects of pH and the concentration of such materials on the energy-saving performance of TPDS which could be potentially used as smart windows were investigated by UV-vis-NIR spectrophotometry. The solar modulating ability (△T) and the luminous transmittance (△T) of the sample were 40.1% and 47.1% when 10 g/L TPDS was chosen at pH 3. The results indicate that TPDS exhibits excellent optical performance with a controllable LCST, which shows great potential for the application as a smart window.
成功合成了一种热和 pH 双重响应的淀粉（TPDS），通过醚化反应，其中丁基缩水甘油醚（BGE）用作疏水性试剂，然后加入 2-氯-4,6-二甘氨-[1,3,5]-三嗪（CDT）基团。通过傅里叶变换红外光谱（FTIR）、H 核磁共振（H NMR）和元素分析对得到的材料进行了表征，以确认 BGE 和 CDT 在淀粉分子上的结构和平均取代度。观察到通过增加溶液的 pH 值，可以将 TPDS 的低临界溶液温度（LCST）从 31°C 调节到 47°C。通过紫外可见近红外分光光度法研究了 pH 值和此类材料的浓度对潜在用作智能窗的 TPDS 的节能性能的影响。当选择 10 g/L 的 TPDS 时，在 pH 值为 3 时，样品的太阳调制能力（△T）和光透射率（△T）分别为 40.1%和 47.1%。结果表明，TPDS 具有出色的光学性能和可控的 LCST，在作为智能窗方面具有很大的应用潜力。
