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Preparation of Organic Nanoacid Catalyst for Urethane Formation
Tang Donglin
Author NameAffiliationE-mail
Tang Donglin South China University of Technology msdltang@scut.edu.cn 
Abstract:
Metal-free catalysts are preferred these days in organic synthesis or in polymerizations. Sulfonic acid is reported to be efficient in catalyzing reactions between isocyanates and alcohols. In this work, synthesis of sulfonic acid immobilized organic nanoparticles (nanoacid) and its application in catalyzing urethane formation, are elaborated. The nanoacid can be simply prepared by miniemulsion polymerization with a reactive surfactant, namely sodium 4-((perfluoronon-8-en-1-yl)oxy)benzenesulfonate (OBS), followed by an acidification. From the images of scanning electron microscope, the nanoacid obtained is found to be narrowly dispersed and the average diameter is around 90 nm. The measured sulfur content is 0.5%, from which the content of sulfonic acid in the nanoparticles is calculated to be 0.16 mmol/g. When catalyzing urethane formation based on hexamethylene diisocyanate and n-butanol, the nanoacid catalyst exhibits considerable efficiency.
Key words:  Nanoacid, Catalysis, Urethane, Miniemulsion
FundProject:
Preparation of Organic Nanoacid Catalyst for Urethane Formation
汤栋霖
摘要:
Metal-free catalysts are preferred these days in organic synthesis or in polymerizations. Sulfonic acid is reported to be efficient in catalyzing reactions between isocyanates and alcohols. In this work, synthesis of sulfonic acid immobilized organic nanoparticles (nanoacid) and its application in catalyzing urethane formation, are elaborated. The nanoacid can be simply prepared by miniemulsion polymerization with a reactive surfactant, namely sodium 4-((perfluoronon-8-en-1-yl)oxy)benzenesulfonate (OBS), followed by an acidification. From the images of scanning electron microscope, the nanoacid obtained is found to be narrowly dispersed and the average diameter is around 90 nm. The measured sulfur content is 0.5%, from which the content of sulfonic acid in the nanoparticles is calculated to be 0.16 mmol/g. When catalyzing urethane formation based on hexamethylene diisocyanate and n-butanol, the nanoacid catalyst exhibits considerable efficiency.
关键词:  Nanoacid, Catalysis, Urethane, Miniemulsion
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