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Copolymerization of 1-oxo-2,6,7-trioxa-1-phorsphabicyclo[2,2,2]oct-4-yl methyl acrylate and (10-oxo-10-hydro-9-oxa-10-phosphaphenanthrene-10-yl) methyl acrylate with styrene and their thermal degradation characteristics

Authors

  • Li Yan,

    1. Department of Polymer Science and Materials, Dalian University of Technology, Dalian 116012, People's Republic of China
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  • Yu Bin Zheng,

    Corresponding author
    1. Department of Polymer Science and Materials, Dalian University of Technology, Dalian 116012, People's Republic of China
    • Department of Polymer Science and Materials, Dalian University of Technology, Dalian 116012, People's Republic of China
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  • Xiaobin Liang,

    1. Department of Polymer Science and Materials, Dalian University of Technology, Dalian 116012, People's Republic of China
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  • Qian Ma

    1. Department of Polymer Science and Materials, Dalian University of Technology, Dalian 116012, People's Republic of China
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Abstract

Two phosphorus-containing acrylates of 1-oxo-2,6,7-trioxa-1-phorsphabicyclo[2,2,2]oct-4-yl methyl acrylate and (10-oxo-10-hydro-9-oxa-10λ5-phosphaphenanthrene-10-yl) methyl acrylate were free-radical-copolymerized with styrene (St). The r1 reactivity ratio values (related to the novel acrylates) were 0.342 and 0.225, respectively, and the r2 reactivity ratio values (related to St) were 0.432 and 0.503, respectively. The thermal stability of the copolymers was tested by thermogravimetric analysis (TGA) in N2 or air, and the ignitability was tested by measurements of UL-94 vertical combustion tests and the limiting oxygen index. The results of TGA and combustion tests indicated that the effect of flame retardancy was determined by the nature of the phosphorus-containing substituent. Compared with the 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide based group, the 1-oxo-2,6,7-trioxa-1-phorsphabicyclo[2,2,2]oct-4-yl methol based group could enhance the ability of char formation with an antidripping effect. It is concluded that phosphorus-containing acrylates are potential flame-retarding monomers for styrenic polymers. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010

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