Citation: Wu Yiwei, Fan Haibo, Yang Rongjie. Nitration Study of Cyclic Ladder Polyphenylsilsesquioxane[J]. Chinese Journal of Organic Chemistry, ;2017, 37(7): 1870-1876. doi: 10.6023/cjoc201612043 shu

Nitration Study of Cyclic Ladder Polyphenylsilsesquioxane

School of Materials Science & Engineering, National Engineering Technology Research Center of Flame Retardant Materials, Beijing Institute of Technology, Beijing 100081

Corresponding author: Yang Rongjie, yrj@bit.edu.cn
Received Date: 14 December 2016
Revised Date: 20 January 2017
Available Online: 1 July 2017
Fund Project: Project supported by the International Science & Technology Cooperation Program of China (No. S2014ZR0465) and the National Natural Science Foundation of China (No. 51273023)the International Science & Technology Cooperation Program of China S2014ZR0465the National Natural Science Foundation of China 51273023

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How to promote polyhedral oligomeric silsesquioxanes (POSS) compatibility with polymers is always the key point of the research on POSS. Introduction of nitro groups into the POSS by nitration is an important method for improving the compatibility between POSS and other polymers. GPC, TGA, ¹H NMR, FTIR and element analysis were used to characterize the structures of the products nitrated from cyclic ladder polyphenylsilsesquioxane (CL-PPSQ) by several kinds of nitration agents, including fuming nitric acid, HNO₃-H₂SO₄, KNO₃-H₂SO₄ and HNO₃-(CH₃CO)₂O. The results showed that NO₂-CL-PPSQ was prepared using 75% HNO₃-(CH₃CO)₂O through a moderate nitration process, meanwhile the cyclic structure of PPSQ was remained, and NO₂-CL-PPSQ of one nitryl group on every phenyl could be prepared. At the same time, the nitration mechanisms using different nitration reagents were analyzed. NO₂⁺, which broke the chemical structure of CL-PPSQ, could be found in the fuming nitric acid and H₂SO₄-HNO₃ (KNO₃) systems. With regard to the HNO₃-(CH₃CO)₂O system, the main activator was CH₃COONO₂ which had appropriate nitration ability. In brief, cyclic ladder polynitrophenylsilsesquioxanes have good solubility in organic solvent, good dispersion in the resin matrix and nitro groups with reaction activity at the same time. The successful synthesis of this polymer provides a precursor for subsequent amination, alkynyl, azide reaction.
- inorganic-organic hybrid materials,
- cyclic ladder polyphenylsilsesquioxane,
- nitration mechanism
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