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Effects of chitin nanocrystals on coverage of coating layers and water retention of coating color

Journal of Bioresources and Bioproducts 2022年第3期7卷 201-210页

作者： Ruoshi Gao Yi Jing Yeyan Ni Qiwen Jiang Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Light Industry and Food EngineeringNanjing Forestry UniversityNanjing 210037China

This study assessed the applicability of chitin nanocrystals prepared by 2,2,6,6-Tetramethyl-1-Piperidine-1-oxyl radical(tempo)-mediated oxidation in traditional papermaking coating color ***𝛼-chitin nanocrystals(CTNCs)with different carboxyl content,size,and morphology were prepared from crab shells by alkali pretreatment and tempo-mediated oxidation in the water at pH 10,and then the ratio of CTNCs to latex was applied to traditional coating color system to replace part of *** results showed that when the amount of NaClO added as co-oxidant in the oxidation was 15.0 mmol/g of chitin,the carboxyl content of alkali-pretreated CTNCs was up to 0.76 mmol/*** amount of carboxyl groups presented a linear relation with the degree of individualization of nanocrystals and *** the ratio of latex to CTNCs was 90꞉10,the water retention value of the coating was 92%lower than that of the pure latex system,and the rheological property was *** relationship between the addition amount of CTNCs and the surface strength and the coverage of coating layers were also studied,and results showed that when the ratio of latex to CTNCs was 95꞉5,the surface strength was the highest of 1.45 m/s,and the coverage of coating layers rate reached the highest of 78%.

关键词： Chitin tempo oxidation Nanocrystals Coating coverage Water retention

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Construction of Multi-Substituted Benzenes via NHC-Catalyzed Reactions of Carboxylic Esters

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Chinese Journal of Chemistry 2018年第4期36卷 333-337页

作者： Jichang Wu Chengli Mou Yonggui Robin Chi Laboratory Breeding Base of Green Pesticide and Agricultural Bioengi- neering Key Laboratory of Green Pesticide and Agricultural Bioengi- neering Ministry of Education Guizhou University Huaxi District Gui- yang Guizhou 550025 China School of Pharmacy Guiyang College of Traditional Chinese Medicine Huaxi District Guiyang Guizhou 550025 China

A carbene-catalyzed ester activation reaction for the synthesis of multi-substituted benzenes is developed. Tetra-substituted benzene com- pounds are efficiently synthesized through this methodology. Compared with aldehyde substrates used in previous reports, the ester substrates used here are much more readily available and inexpensive. In addition, the tempo oxidant used here is more inexpensive than the quinones commonly used in related carbene-catalyzed reactions.

关键词： N-heterocyclic carbene carboxylic ester benzene synthesis organocatalysis tempo oxidation

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