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Charge carrier mobilities in liquid crystalline mesomorphic poly(DI‐ n ‐Alkylsilylene)s; influence of backbone conformation
Author(s) -
van Der Laan Garrelt P.,
De Haas Matthijs P.,
Frey Holger,
Möller Martin
Publication year - 1995
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.19950960120
Subject(s) - mesophase , materials science , conductivity , polymer , charge carrier , phase (matter) , crystallography , liquid crystal , phase transition , chemical physics , chemistry , organic chemistry , thermodynamics , physics , optoelectronics , composite material
Abstract The charge transport properties of a series of symmetrically substituted mesomorphic poly(di‐n‐alkylsilylene)s are studied using the pulse‐radiolysis time resolved microwave conductivity (PR‐TRMC) technique. The observed conductivities for these polymers could be correlated with different backbone conformations present both in the crystalline solid phase and in the liquid crystalline mesophase. The transition from the solid phase to the mesophase is accompanied by a disordering of the silicon backbone that results in a decrease of the conductivity of up to two orders of magnitude. The charge carrier mobilities found varied from 5×10 −5 m 2 /Vs for the all‐trans conformation in the solid phase to 6×10 −7 m 2 /Vs for the disordered backbone conformation in the mesophase. The anisotropic radiation‐induced conductivity observed for aligned poly(di‐n‐hexylsilylene) samples demonstrate that charge carrier migration takes place preferentially in the direction of the polymer backbone.