Preparation and characterization of SiO2-coated 2,4-hexadiyn-1,6-bis(ethylurea) microcapsules

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• 作者：Huan Cheng (1)
  Guangming Zhu (1)
  
• 关键词：2 ; 4 ; Hexadiyn ; 1 ; 6 ; bis(ethylurea) ; SiO2 ; 2 ; 4 ; Hexadiyn ; 1 ; 6 ; bis(ethylurea)/SiO2 microcapsule
• 刊名：Chemical Research in Chinese Universities
• 出版年：2014
• 出版时间：June 2014
• 年：2014
• 卷：30
• 期：3
• 页码：431-436
• 全文大小：
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• 作者单位：Huan Cheng (1)
  Guangming Zhu (1)
  
  1. Department of Applied Chemistry, Northwestern Polytechnical University, Xi’an, 710129, P. R. China
  
• ISSN：2210-3171

文摘

A novel kind of time-temperature indicator, SiO2-coated 2,4-hexadiyn-1,6-bis(ethylurea) microcapsules, has been fabricated by coating SiO2 on 2,4-hexadiyn-1,6-bis(ethylurea). This kind of microcapsules is a model hydrophilic indicator, its stability is improved. And temperature-induced color change is irreversible even under varying irradiation. The influences of ammonia, tetraethyl orthosilicate(TEOS) and temperature on the product have been investigated. 2,4-Hexadiyn-1,6-bis(ethylurea) and the coated particles have been characterized by means of elemental analysis, mass spectrum, FTIR and Raman spectra and DSC, SEM, TEM and DLS analyses. The results indicate that 2,4-hexadiyn-1,6-bis(ethylurea)/SiO2 ratios, ammonia concentration and temperature could modulate the monodispersity and size of the microcapsules. The experiments indicate that when the molar ratio of 2,4-hexadiyn-1,6-bis(ethylurea)/SiO2/ammonia is 1:3:3.5 and temperature is 40 °C, the obtained microcapsules are well coated with the best monodispersity. Such sustained-release and hydrophilic microcapsules have very good prospects as a novel time-temperature chromatic indicator.