期刊
POLYMER DEGRADATION AND STABILITY
卷 93, 期 11, 页码 2042-2047出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2008.02.017
关键词
Organo phosphorus; Flame retardant; ABS; Polycarbonate; Spirobisphosphonate; Spirobisphosphate
A series of organo-cyclic phosphorus compounds were synthesized in an attempt to find an efficient flame retardant (FR) for acrylonitrile-butadiene-styrene (ABS). The success of synthesis was confirmed by H-l and P-31 NMR. Thermogravimetric analysis (TGA) results reveal that cyclic phosphorus compounds synthesized in this study show almost one step degradation between 250 and 400 degrees C and are believed to work in the vapour phase rather than in the condensed phase. From UL-94 test, V-0 rating was achieved at 15-35 wt% loading of cyclic or cyclic alkyl phosphonate FR and no rating at 35 wt% loading of cyclic phosphate for ABS. On the other hand, a much lower loading (7.5%) was needed to obtain V-0 rating for polycarbonate when 3,9-diphenyl-3,9-dioxa-2,4,8,10-tetraoxa-3,9-diphosphaspiro-5,5-undecane (PBPP) was added as FR. All the results show that the flame retarding effect is strongly dependent on the P content of the FR incorporated. The flame retardant mechanism of cyclic phosphorus compounds is also discussed. (c) 2008 Elsevier Ltd. All rights reserved.
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