Shang Jian-li, Zhang Hao, Xiong Lei, Ma Xiang-long
Guang Pu Xue Yu Guang Pu Fen Xi. 2016 Aug;36(8):2430-6.
SiO2-based phase change and humidity storage composite materials with phase change thermal control performance and humidity storage humidity control performance were made with SiO2 as the carrier and fatty acid as a phase change material. Phase change thermal control performance and humidity storage humidity control performance of SiO2-based phase change and humidity storage composite materials with different fatty acid content were tested with isothermal sorption method and cooling curve method. Composition structure of SiO2-based phase change and humidity storage composite materials were tested by Fourier transform infrared spectrum to analyze chimeric mechanism of SiO2 and fatty acid. Characteristic FTIR absorption peaks of SiO2-based phase change and humidity storage composite materials were considered as input layer; different fatty acid content of SiO2-based phase change and humidity storage composite materials, average values of absorption equilibrium moisture content and desorption equilibrium moisture content of SiO2-based phase change and humidity storage composite materials with relative humidity as 52.89%, and cooling time from 30 to 15 ℃ of SiO2-based phase change and humidity storage composite materials were seen as output layer respectively; S activation function was treated as hidden layer; then, optimization performance forecast model of SiO2-based phase change and humidity storage composite materials with structural parameters and phase change and humidity storage comprehensive performance was established by back-propagation neural network. The results showed that SiO2 and fatty acid are only physical chimeric to each other, while there is no chemical reaction between them. SiO2-based phase change and humidity storage composite materials by adding in 0.079 mol fatty acid has the best phase change and humidity storage comprehensive performance, that is, absorption equilibrium moisture content is 0.132 3 g·g-1, desorption equilibrium moisture content is 0.147 5 g·g-1, average value of equilibrium moisture content is 0.139 9 g·g-1 when relative humidity is 52.89%, cooling time from 30 to 15 ℃ is 1 305 s. Optimization performance forecast model of SiO2-based phase change and humidity storage composite materials are proved well with good accuracy, and the relative error of predicted data and experimental data are -2.07% and 2.45%, respectively; forecast model can be used for optimizing forecast phase change thermal control performance and humidity storage humidity control performance of SiO2-based phase change and humidity storage composite materials.
以二氧化硅（SiO₂）为载体、脂肪酸为相变材料制备了具有相变热控性能和吸湿控湿性能的SiO₂基相变储湿复合材料。采用等温吸附法和冷却曲线法测试了不同脂肪酸含量的SiO₂基相变储湿复合材料的相变热控性能和吸湿控湿性能。通过傅里叶变换红外光谱对SiO₂基相变储湿复合材料的组成结构进行测试，以分析SiO₂与脂肪酸的嵌合机理。将SiO₂基相变储湿复合材料的特征傅里叶变换红外吸收峰作为输入层；将不同脂肪酸含量的SiO₂基相变储湿复合材料、相对湿度为52.89%时SiO₂基相变储湿复合材料的吸附平衡含水量和脱附平衡含水量的平均值以及SiO₂基相变储湿复合材料从30℃冷却到15℃的时间分别作为输出层；采用S激活函数作为隐藏层；然后，通过反向传播神经网络建立了具有结构参数以及相变和储湿综合性能的SiO₂基相变储湿复合材料的优化性能预测模型。结果表明，SiO₂与脂肪酸之间仅为物理嵌合，二者之间不存在化学反应。添加0.079 mol脂肪酸的SiO₂基相变储湿复合材料具有最佳的相变和储湿综合性能，即相对湿度为52.89%时，吸附平衡含水量为0.132 3 g·g⁻¹，脱附平衡含水量为0.147 5 g·g⁻¹，平衡含水量平均值为0.139 9 g·g⁻¹，从30℃冷却到15℃的时间为1305 s。SiO₂基相变储湿复合材料的优化性能预测模型具有良好的准确性，预测数据与实验数据的相对误差分别为-2.07%和2.45%；该预测模型可用于优化预测SiO₂基相变储湿复合材料的相变热控性能和吸湿控湿性能。
