Abstract
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 °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.
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