Citation: . SYNTHESIS AND CHARACTERIZATION OF NOVEL CHIRAL SMECTIC C(Sc*) PHASE SHISH-KEBAB TYPE LIQUID CRYSTALLINE BLOCK COPOLYMERS*[J]. Chinese Journal of Polymer Science, ;1999, 17(6): 579-587. shu

SYNTHESIS AND CHARACTERIZATION OF NOVEL CHIRAL SMECTIC C(Sc) PHASE SHISH-KEBAB TYPE LIQUID CRYSTALLINE BLOCK COPOLYMERS

Received Date: 17 January 1998

A new series of chiral shish-kebab type liquid crystal block copolymers that form the smecticC(Sc*) phase was synthesized by solution polycondensation. The copolymers were characterized by GPC.DSC. TG, POM. X-ray diffraction and polarimeter. The copolymers 7 entered into liquid crystal phase whenthey were heated to their melting temperatures (Tm) and the copolymers 8 were in liquid crystal phase at roomtemperature with low viscosities. The smectic sanded texture or focal-conic texture were observed on POM.All the chiral block copolymers showed high optical activity .No racemization has happened.Temperature-variable X-ray diffraction study together with POM and polarimetric analysis realized that they are chiral smecticC(Sc*) phase.Thus we offer in this report the first example of shish-kebab type liquid crystal block copolymers that from a chiral smectic C(Sc*)phase.The variation of melting and isotropization temperatures with molecular structure was also discussed.
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