期刊
JOURNAL OF APPLIED POLYMER SCIENCE
卷 137, 期 41, 页码 -出版社
WILEY
DOI: 10.1002/app.49256
关键词
crosslinking; degradation; resins; thermal properties
资金
- Nanjing Science and Technology Committee [2014-030002]
- Fundamental Research Funds for the Central Universities [2242017k1G006]
According to the requirement of fire life cycle assessment (LCA), chitosan ethoxyl urea phosphate (CEUP), an organic-inorganic intumescent flame retardant (IFR) containing phosphorus, nitrogen, and silicon, was synthesized by the reaction of chitosan, phosphorus pentoxide, and urea. FTIR,H-1 NMR, SEM, and XRD were employed to characterize the compounds. As a result, CEUP was successfully prepared with higher thermal stability, favorable to enhance fire resistance. Combined with OMMT, the organic/inorganic IFR was applied as EP flame-retardant agents. The combustion behavior of EP composite was investigated by LOI, UL-94, CCT, SEM, TGA, and TG-IR. It was observed that using 15% CEUP and 3% OMMT (EP3), LOI value reached 34.8% and passed the UL-94 V-0 rating, while THR and TSP of EP composite reduced 65 and 72% compared with pure EP. The char residue of EP composite was up to 22.4%. The thermal decomposition mechanism was traced from 100 to 600 degrees C by TG-IR. It was suggestive that CEUP decomposition commenced at 100 degrees C to create phosphoric acid and sublimation of urea occurred at 300 degrees C. EP3 exhibited a strong thermal stability, namely even at 600 degrees C, the volatile substances were detectable. Dense and expanded carbon layer was confirmed in SEM images.
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