Accession Number:

ADA183826

Title:

Synthesis and Characterization of Biphasic Liquid Crystalline Polysiloxanes Containing 4-Undecanyloxy-4'-Cyanobiphenyl Side-Groups.

Descriptive Note:

Technical rept.,

Corporate Author:

CASE WESTERN RESERVE UNIV CLEVELAND OH DEPT OF MACROMOLECULAR SCIENCE

Personal Author(s):

• Hsu,Chain S.
• Percec,Virgil

Report Date:

1986-01-01

Pagination or Media Count:

12.0

Abstract:

The synthesis and characteristization of liquid crystalline polysiloxanes and copolysiloxanes containing 4-undecdanyuloxy-4 cyanobiphenyl side groups is presented. The polysiloxane presents a single glass transition temperature followed by an SC and an SA mesophase. Copolysiloxanes presenting around 50 weight fraction of side groups exhibit two glass transition temperatures i.e., one due to the independent motion of the main chain and the other due to the cooperative but independent motion of the side groups, and in addition to the SC and SA phases exhibited by the homopolymer, present also side-chain crystallization.

Descriptors:

• *LIQUID CRYSTALS
• *POLYMERS
• *SILOXANES
• CRYSTALLIZATION
• GLASS
• MOTION
• POLYMERS
• SILOXANES
• TRANSITION TEMPERATURE
• SYNTHESIS(CHEMISTRY)
• CHEMICAL PROPERTIES
• BIPHENYL
• COPOLYMERS

Subject Categories:

• Polymer Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE