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On the formation of liquid crystalline texture in epoxy resins
Author(s) -
Grebowicz Janusz S.
Publication year - 1996
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19961040119
Subject(s) - crystallinity , epoxy , monomer , materials science , liquid crystal , nucleation , curing (chemistry) , liquid crystalline , optical microscope , texture (cosmology) , composite material , chemical engineering , polymer chemistry , organic chemistry , polymer , chemistry , scanning electron microscope , optoelectronics , engineering , image (mathematics) , artificial intelligence , computer science
Three epoxy resins and two curing agents were studied in their monomeric as well as polymeric states. Two monomers were monotropic liquid crystals. Characterization of liquid crystallinity before, during and after curing reaction was carried out by DSC, optical microscopy and WAXS. It was found that LC texture develops in every epoxy/(curing agent) system studied in this work. Nucleation and growth is a physical mechanism for the formation of initial liquid crystallinity. The final texture is not well defined and likely contains nematic, poorly ordered smectic and isotropic phases. Schematic diagram of the possible states of LCTs is discussed.