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首页> 外文期刊>RSC Advances >Preparation and characterization of spherical β-cyclodextrin/urea–formaldehyde microcapsules modified by nano-titanium oxide
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Preparation and characterization of spherical β-cyclodextrin/urea–formaldehyde microcapsules modified by nano-titanium oxide

机译：纳米氧化钛修饰的球形β-环糊精/脲醛微囊的制备与表征

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摘要

We successfully prepared novel β-cyclodextrin/urea–formaldehyde (β-CD/UF) microcapsules modified by nano-TiO2 using KH560 silane coupling agent by in situ polymerization and grafting method. The as-prepared TiO2–β-CD/UF microcapsules displayed excellent energy storage properties with a melting enthalpy of 154.6 J g?1, and the paraffin content in the TiO2–β-CD/UF microcapsules was as high as 75.94%, indicating a high energy storage capacity. Nano-titanium oxide was successfully reacted onto the surface of the β-CD/UF microcapsules using KH560 by forming new C–O–Si and Ti–O–Si chemical bonds, which was confirmed by FT-IR and XPS technology. Besides, pH played an important role in the encapsulation of phase change paraffin by affecting the curing reaction rate of the shell materials. Also, the thermal decomposition temperature of the TiO2–β-CD/UF microcapsules was highly improved by about 90 °C compared with that of β-CD/UF microcapsules without treatment by TiO2 nanoparticles, mainly due to the formation of C–O–Si and Ti–O–Si chemical bonds. The as-prepared TiO2–β-CD/UF microcapsules in this experiment might be used as an effective and potential media for energy storage.
机译：我们成功地使用Kem硅烷偶联剂KH560原位制备了纳米TiO 2 改性的新型β-环糊精/脲醛（β-CD/ UF）微囊。 聚合和接枝方法。制备的TiO 2 –β-CD / UF微胶囊具有优异的储能性能，熔融焓为154.6 J g ？1 ，TiO 2 –β-CD / UF微胶囊中的石蜡含量高达75.94％，表明具有很高的储能能力。使用KH560通过形成新的C–O–Si和Ti–O–Si化学键，使纳米二氧化钛成功地反应到β-CD/ UF微囊的表面，这已通过FT-IR和XPS技术得到证实。此外，pH通过影响壳材料的固化反应速率在相变石蜡的包封中起重要作用。而且，与没有β-CD/ UF的微胶囊相比，TiO 2 -β-CD/ UF的微囊的热分解温度可提高约90°C。 TiO 2 纳米粒子的表面处理，主要是由于形成了C–O–Si和Ti–O–Si化学键。本实验制备的TiO 2 –β-CD / UF微胶囊可作为一种有效且潜在的能量存储介质。

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