Premium
Some unusual structures in thermotropic mesophase polymers
Author(s) -
Plate' N.A.,
Tal'roze R.V.,
Levchenko A.A.,
Shandryuk G.A.,
Antipov E.M.
Publication year - 2001
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 - 10.1002/1521-3900(200110)175:1<197::aid-masy197>3.0.co;2-5
Subject(s) - mesophase , materials science , thermotropic crystal , liquid crystal , polymer , elastomer , composite material , isotropy , polyester , polymer chemistry , liquid crystalline , optics , physics , optoelectronics
Random copolymers of polyester type have been shown to exhibit simultaneous crystallization into two different crystalline forms which are transformed into different hexagonal mesophase structures on heating. Some of these polymers have been found to form LC aperiodic smectic structures. Liquid Crystal elastomers, H‐bonded networks and grafted LC materials are discussed. Mechanical field creates the director reorientation in monodomain elastomers and H‐bond networks which is discussed in terms of “soft elasticity”. Grafting of particular LC polymer on fluorine containing polymer support results in the formation of composite sandwich‐type material. Mechanical deformation leads to the macroscopic alignment of the LC grafted layer. There is a pronounced memory effect, which is manifested in the macroscopic alignment of the grafted layer under cooling from an isotropic to a LC state. The phenomenon observed results from the strong influence of the polymer support on the LC director orientation. The optical and mechanical properties of sandwiched samples can be regulated in wide limits.