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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH · 2017 · IF 2.843

Acid-Catalyzed Synthesis of Trioxane in Aprotic Media

Weiting Ma,Yufeng Hu,Jianguang Qi,Lihu Wei,Xianming Zhang,Zhenyu Yang,Siqi Jiang

The effects of solvent, acid specificity, acid concentration, added salt, and reaction temperature on the yields of trioxane and formic acid (byproduct) in paraformaldehyde + acid (or acid + salt) + aprotic solvent were investigated. The mechanism that underlies the yield of paraformaldehyde and the selectivity of trioxane was determined. A highly practical and efficient synthesis of trioxane by a salt-mediated and acid-catalyzed yield of paraformaldehyde in sulfolane media was developed. The method increased the yield of paraformaldehyde by more than 5 times and decreased the formic acid concentration by 10 times compared to the commercial synthesis of trioxane in an aqueous reaction system (formaldehyde + H2SO4 + H2O).

CAS / MDL: 5872-08-2 67-68-5 67-71-0 996-35-0 126-33-0 1493-13-6

研究领域: 有机化学 · 工业化学

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Surfaces and Interfaces · 2025 · IF 6.3

pH-Sensitive halloysite nanocontainers encapsulated by silicate-mediated tannic acid networks for the smart epoxy coatings

Xinnian Meng,Jingqi Chen,Zeyang Liu,Yongming Tang

An important issue regarding halloysite nanotubes as inhibitor containers is the stimuli-responsive performance. A novel approach to constructing pH-sensitive halloysite nanocontainers is developed in this study. The silicate-mediated tannic acid complexes (Si-TA) are deposited on the etched halloysite nanotubes (EHNTs) loading Na 2 MoO 4 , endowing the Si-TA/Mo@EHNTs nanocontainers with the high pH-sensitivity. Both the release rate and ratio of the inhibitor increase with increasing pH. The sensitivity of the nanocontainers to the high pH value arises from the rapid hydrolysis of Si-TA encapsulation layers in the basic media. It is evidenced that gallic acid (GA), generated from the hydrolysis of the Si-TA complexes, can further dimerize into ellagic acid (EA) in the basic media. The smart epoxy coatings with the stimuli-responsive performance are prepared by incorporating the Si-TA/Mo@EHNTs nanocontainer, and exhibit better corrosion resistance compared with the epoxy coatings without the nanocontainers as well as directly incorporated with Na 2 MoO 4 . The elevated pH in the cathodic region of corrosion cell trigger the release of MoO 4 2- ions from the nanocontainers, inhibiting the corrosion of the exposed substrates effectively. Furthermore, the EA-Fe(III) depositions could be formed by the combination of the EA compounds from the damage of the encapsulation layers with the Fe 3+ ions, acting as the barrier on the exposed substrates to improve the corrosion resistance of the coating.

CAS / MDL: 1401-55-4 149-91-7 150-25-4 476-66-4

研究领域: 材料科学 · 纳米技术 · 表面工程 · 腐蚀科学 · 高分子科学

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Acid-Catalyzed Synthesis of Trioxane in Aprotic Media

pH-Sensitive halloysite nanocontainers encapsulated by silicate-mediated tannic acid networks for the smart epoxy coatings