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To achieve high-performance thermosets, three diallyl-containing main-chain type benzoxazine polymers, (MCBP) were prepared from Mannich condensation of 2,2′-diallyl bisphenol A, paraformaldehyde, and three diamines: 4,4′-diaminodiphenylmethane (DDM), 4,4′-oxydianiline (ODA), and 2,2′-bis(4-(4-aminophenoxy)phenyl)propane (BAPP), respectively. These MCBPs can be cured and general a phenolic hydroxyl...
A phosphinated biphenol, 6-(1-(4-hydroxy-3-methoxyphenyl)-1-(4-hydroxyphenyl)ethyl)-6H-dibenzo[c,e] [1,2]oxaphosphinine 6-oxide (1), was synthesized from a sustainable phenol, acetovanillone. A methoxy-substituted poly(ether sulfone), methoxy-PES-1, was successfully prepared by the nucleophilic substitution of (1) and difluorodiphenyl sulfone in the presence of potassium carbonate. Another phosphinated...
A pyridinyl-containing benzoxazine (6) was synthesized from the Mannich condensation of 4-phenyl-2,6-bis(4-aminophenyl) pyridine (2), phenol, and paraformaldehyde. For the purpose of properties comparison, a benzoxazine (7), which is structurally similar to (6) except for the pyridinyl group, was prepared. The solvent effect on the synthesis of (6) was discussed, and toluene/ethanol was found to provide...
Marine debris is a ubiquitous problem that poses a serious threat to the global oceans; it has motivated public participation in clean-up campaigns, as well as governmental involvement in developing mitigation strategies. While it is known that the problem of marine litter may be affected by waste management practices on land, beach survey results have seldom been compared with them. In this study,...
Linear poly(aryl ether)s are generally prepared from equal mole of bisphenols and aromatic bishalides in the presence of a base. Therefore, preparing poly(aryl ether)s with a residual phenol group in the repeating unit is a challenge. In this work, we report the synthesis of a phosphinated polyether (P1) with a phenol pendent group in the repeating unit from a one-pot reaction of a BPA-based poly(ether...
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