4.6 Article

An intrinsic flame retardant epoxy resin with high transparency and strengthened mechanical property

期刊

JOURNAL OF APPLIED POLYMER SCIENCE
卷 138, 期 42, 页码 -

出版社

WILEY
DOI: 10.1002/app.51230

关键词

flame retardance; mechanical properties; thermal properties; thermosets

资金

  1. National Natural Science Foundation of China [22075045]
  2. Natural Science Foundation of Fujian Province [2019J01061338]

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By synthesizing DOPO-based phosphonate ammonium salt (DOA) and blending it with epoxy thermosets (EP), the flame-retardant and mechanical performances of EP can be significantly improved, leading to enhanced tensile strength, impact toughness, while also maintaining high transparency.
In order to search for multifunctional epoxy thermosets (EP) with low flammability, high transparency and satisfied mechanical performance, DOPO-based phosphonate ammonium salt (DOA) was synthesized from 10-hydroxy-9,10-dihydro-9-oza-10-phosphaphenanthrene-10-oxide (DOPO-OH) and 2-amino-2-methyl-1,3-propanediol (AMPD). Under the influence of DOA, the flame-retardant and mechanical performances of the resulting EP were obviously improved. On account of the enhanced interaction and the incorporated flexible fragments in epoxy macromolecular chains, the tensile strength, elongation at break, and impact toughness of EP/5.0 wt% DOA significantly increased from 65.4 +/- 1.2 MPa, 6.7 +/- 0.6%, and 12.1 +/- 1.3 kJ m(-2) of EP to 81.4 +/- 2.8 MPa, 10.6 +/- 0.5%, and 18.0 +/- 1.1 kJ m(-2), respectively. In the presence of DOA, the limiting oxygen index (LOI) value of EP/5.0 wt% DOA increased to 35.5% and it passed the underwriter laboratories-94 vertical burning tests (UL-94 V) and got a V-1 rating. Moreover, the peak value of heat release rate (PHRR) was decreased by 38.0%. The analyses of char residues and volatile products showed that the activities of DOA on reducing the flammability of EP were ascribed to the protective effect of the char, the release of incombustible gases, and the radical-capture action of phosphorus-containing free radicals. Moreover, the modified epoxy thermosets still retained a high transparency.

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