Laser Mass Spectrometry Analysis of the Formation of Phosphazene-Containing Epoxy Oligomers
| Autor: | Roman S. Borisov, S. N. Filatov, Igor S. Sirotin, Vyacheslav V. Kireev, Yu. V. Bilichenko |
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| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
Bisphenol A Polymers and Plastics Double bond Chemistry Epoxide 02 engineering and technology Epoxy 010402 general chemistry 021001 nanoscience & nanotechnology HEXA Alkali metal 01 natural sciences 0104 chemical sciences chemistry.chemical_compound visual_art Polymer chemistry Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Epichlorohydrin 0210 nano-technology Phosphazene |
| Zdroj: | Polymer Science, Series B. 60:243-262 |
| ISSN: | 1555-6123 1560-0904 |
| Popis: | The main features of two methods for the synthesis of phosphazene-containing epoxy oligomers— namely, the methods based on oxidation of double bonds in organooxyphosphazenes and on the reaction of chlorocyclophosphazenes with diphenols and the subsequent interaction of the resulting hydroxy-aryloxy phosphazenes with epichlorohydrin—were examined. Using the example of hexa- and octa-eugenol derivatives of the corresponding cyclophosphazenes, optimal conditions were established for the oxidation of allyl groups of these compounds with peroxy acids and hexa- and octa-epoxide cyclophosphazenes were characterized. It was noted that the epoxidation of eugenol derivatives of a mixture of cyclophosphazenes with three to eight phosphazo groups is accompanied by side reactions leading to the formation of P–OH bonds and the partial opening of oxirane cycles. Bisphenol A phosphazene-containing oligoepoxides were synthesized both via the stage involving the formation of hydroxy-aryloxy cyclophosphazenes and their subsequent epoxidation with epichlorohydrin and via the direct interaction of chlorocyclophosphazenes with an excess of bisphenol A (BPA) in the presence of solid alkali. In the latter case, the resulting oligomers are mixtures of the conventional epoxide and phosphazene-containing epoxy oligomers. The content of the latter can be adjusted up to 50%. The synthesized oligomers contain 1–5% phosphorus. They can be cured by conventional hardeners to form flameproof or noncombustible compositions. |
| Databáze: | OpenAIRE |
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