4.7 Article

Flame retardancy and chemical degradation of epoxy containing phenylphosphonate group under mild conditions

期刊

COMPOSITES PART B-ENGINEERING
卷 239, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2022.109967

关键词

Phenylphosphonate; Chemical degradation; Flame retardancy; Epoxy

资金

  1. National Natural Science Foundation of China [51991355]
  2. Ningbo Major special projects of science and technology innovation 2025 [2021Z067]

向作者/读者索取更多资源

The development of recycling methods for thermosetting resin is challenging due to their structure. In this study, a phenylphosphonate based epoxy monomer was prepared to regulate the flame retardancy and chemical degradation behavior of epoxy. The results showed that the introduction of phenylphosphonate into epoxy could improve its flame retardant and recyclable properties.
The development of methods for recycling of thermosetting resin is difficult due to their structure. To regulate the flame retardancy and chemical degradation behavior of epoxy (EP), a phenylphosphonate based EP monomer (DGEP) was prepared and cured using 4,4-diamino diphenylmethane (DDM). For comparison, bisphenol A EP (DGEBA/DDM) was also prepared. The modes of flame retardancy and chemical degradation have been investigated. The DGEP/DDM displays a UL-94 V0 rating while the DGEBA/DDM may not be classified in the UL-94 test. Moreover, DGEP/DDM is stable in most solvents and is degraded after 40 min in a solution of methanol/sodium hydroxide (NaOH)/water (H2O) at 50 degrees C, while DGEBA/DDM is stable under the same conditions. Degradation occurs by hydrolysis and alcoholics of phenylphosphonate in the main chain of EP under alkaline conditions. In addition, DGEP/DDM has a similar glass transition temperature and tensile properties as those for DGEBA/DDM. The introduction of phenylphosphonate into EP may represent a useful method for the preparation of flame retardant and recyclable EP. C

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