有机改性二氧化硅纳米胶囊化相变材料研究

发布时间：2018-02-24 09:20

本文关键词： 相变材料纳米胶囊有机改性二氧化硅正十八烷　出处：《含能材料》2016年06期 　论文类型：期刊论文

【摘要】：胶囊化相变材料(PCMs)在炸药件隔热防护、电子器件控温等具有潜在应用价值,但现有无机壁材胶囊化PCM s存在粒径大、易破裂及与有机聚合物相容性差等局限。本研究利用不同有机硅烷前驱体在细乳液中的界面水解-缩聚方法,合成了一系列有机改性二氧化硅包覆正十八烷相变纳米胶囊。分别采用傅里叶变换红外光谱(FT-IR)、X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、差示扫描量热(DSC)和水接触角(WCA)等手段对其化学结构、结晶结构、形貌、相变特性和壁材疏水性进行了表征。结果表明,通过改变有机硅烷前驱体的体积比,得到了球形和碗状两种形貌的相变纳米胶囊,尺寸为200~693 nm,熔融焓为93.2~107.5 J·g~(-1),胶囊壁材的水接触角为67°~155°,可实现亲水-疏水-超疏水性表面性质调控。并且有机改性二氧化硅纳米胶囊化PCMs在超声作用下不易破碎,显示力学性能得到了改善。
[Abstract]:The encapsulated phase change material (PCMs) has potential application value in the thermal insulation protection of explosive parts and the temperature control of electronic devices, but the existing inorganic wall material encapsulated PCMs has large particle size. In this paper, the interfacial hydrolysis-Polycondensation method of different organosilane precursors in fine emulsion was studied. A series of organic modified silica coated with 18 alkane phase change nanocapsules were synthesized. Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and water contact angle (WCA) were used respectively. Means to its chemical structure, The crystalline structure, morphology, phase transformation and hydrophobicity of the wall were characterized. The results showed that the spherical and bowl phase change nanocapsules were obtained by changing the volume ratio of organosilane precursors. The size is 200 ~ 693 nm, the melting enthalpy is 93.2 ~ 107.5 J 路g ~ (-1) ~ (-1), the water contact angle is 67 掳~ 155 掳, the hydrophilic-hydrophobic superhydrophobic surface property can be regulated, and the organic modified silica nano-encapsulated PCMs is not easy to be broken under ultrasonic action. It shows that the mechanical properties have been improved.
【作者单位】：西南科技大学材料科学与工程学院;中国工程物理研究院化工材料研究所;
【基金】：国家自然科学基金资助(51273183)
【分类号】：TB34

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