ISSN:
0025-116X
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
A novel set of low molecular weight copolymers have been synthesized which were based on the attachment of mesogenic groups to the terminal points of oligomer backbones. The placement of the groups at the end of the chains apparently allowed a second phase to form more easily than if the groups were attached along the backbone as pendant groups. The nature of the coupler or spacer was determined to influence whether the end groups crystallized or formed liquid crystallinity. The observation of liquid crystallinity was found to depend primarily on the relative concentration of mesogen to backbone molecular weight. Depending upon the specific coupler, there existed two critical values of molecular weight between which mesophase behavior was observed. Below a certain value, the end groups were found to crystallize. Above another critical value, there was no measureable second phase. Liquid crystallinity was only observed when the molecular weight was intermediate between the two critical values.
Additional Material:
9 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/macp.1986.021871217
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