Premium
Synthesis and thermal properties of liquid crystalline side chain polymers with pendant cellobiose residues
Author(s) -
Takaragi Akira,
Minoda Masahiko,
Miyamoto Takeaki,
Watanabe Junji
Publication year - 1998
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/(sici)1521-3935(19980601)199:6<1119::aid-macp1119>3.0.co;2-#
Subject(s) - side chain , cellobiose , polymer chemistry , polymer , chemistry , thermal , chain (unit) , polymer science , liquid crystalline , chemical engineering , materials science , organic chemistry , cellulose , thermodynamics , physics , astronomy , engineering , cellulase
Two series of thermotropic polymethacrylate (PM) samples with pendant cellobiose residues and an alkyl spacer (number of carbon atoms n = 4 and 10) were synthesized, and their mesomorphic properties were investigated to elucidate the function of acylated cellobiose moieties as discotic mesogens by differential scanning calorimetry (DSC), polarization microscopy and X‐ray diffraction. The PM‐4 samples with a short spacer ( n = 4) showed two kinds of mesophases in a wide temperature region up to the degradation temperature of the sample, i. e., about 230°C, whereas the PM‐10 samples with a long spacer ( n = 10) showed a single mesophase between 45 and 135°C. X‐Ray diffraction data suggested that both the mesophases formed by PM‐4 and PM‐10 belong to a kind of discotic columnar phases in which the side chain mesogens form the discotic columns around the polymer backbone.