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- W2148955656 abstract "Abstract Pyromellitic dianhydride (1) was reacted with L-leucine ( 2 ) to result in [ N,N' -(pyromellitoyl)-bis-L-leucine diacid] ( 3 ). This compound ( 3 ) was converted to N,N' -(pyromellitoyl)-bis-L-leucine diacid chloride ( 4 ) by reaction with thionyl chloride. The microwave-assisted polycondensation of this diacid chloride ( 4 ) with polyethyleneglycol-diol ( PEG-200 ) and/or three synthetic bisphenols furnish a series of new PEI s and Co-PEI s in a laboratory microwave oven (Milestone). The resulting polymers and copolymers have inherent viscosities in the range of 0.31- 0.53 dl g -1 . These polymers are optically active, thermally stable and soluble in polar aprotic solvents such as DMF, DMSO, NMP, DMAc and sulfuric acid. All of the above polymers were fully characterized by IR spectroscopy, 1 H NMR spectroscopy, elemental analyses, specific rotation and thermal analyses. Some structural characterizations and physical properties of these optically active PEI s and Co-PEI s are reported." @default.
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- W2148955656 date "2009-12-01" @default.
- W2148955656 modified "2023-10-17" @default.
- W2148955656 title "Microwave-assisted synthesis and characterization of some optically active poly(ester-imide) thermoplastic elastomers" @default.
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- W2148955656 doi "https://doi.org/10.1515/epoly.2009.9.1.839" @default.
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