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- W1541663274 abstract "Poly(amic acids) (PAAs) were prepared from pyromellitic dianhydride (PMDA) and diamines such as 2,2′-difluoro-, 3,3′-difluoro- and 2,2′-dichloro-4,4′-methylenedianiline. These PAAs form liquid crystals in N-methyl-2-pyrrolidone (NMP) solution, in addition to the PMDA/4,4′-methylenedianiline (MDA) system reported previously. NMP was the only solvent in which liquid crystals were formed. The “liquid crystal” was shown to be a polymer crystallosolvate (PCS) of PAA and NMP. 1H NMR spectroscopy revealed that PAAs derived from PMDA contain isophthalamide and terephthalamide repeating units in nearly equal proportion, which varies slightly between samples prepared in NMP and dimethylacetamide (DMAc). WAXS showed that the PAA from PMDA/MDA is non-crystalline but forms a liquid crystalline state in NMP solution. The rate of crystallization is, however, vastly different between samples prepared in different solvents. This was attributed to their difference in chain conformation, which has to be an extended one for PCS formation. The morphologies of PCS are given, and limitations in PCS formation are discussed in terms of PAA structure and solvent." @default.
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- W1541663274 date "1989-08-01" @default.
- W1541663274 modified "2023-09-26" @default.
- W1541663274 doi "https://doi.org/10.1002/macp.1989.021900805" @default.
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