Jinseo Ahn

Abstract

A series of novel poly(ester-imide)s were prepared by the reactions of 6,6'-(3,3',4,4'-benzophenonetetracarboxylic diimido)-bis-hexanoic acid with various aliphatic diols containing four to ten methylene groups using a melt polymerization technique. Besides these, a novel poly(esterimide) was synthesized by the reaction of 1 1 , 1 1 '-(3,3', 4,4'- benzophenonetetracarboxylic diimido)-bis-undecanoic acid with 1 ,6-hexanediol employing the same technique. Two kinds of monomers containing diimide diacids were prepared by the reactions of 3,3',4,4'-benzophenonetetracarboxylic dianhydride with respective 6-aminocaproic acid and 1 1 -aminoundecanoic acid. A total of eight poly(ester-imide)s, PEIMs, were characterized for liquid crystalline properties. The solubility, viscosity, infrared spectroscopy, thermal analyses such TGA and DSC, and the optical studies were performed. Infrared spectra of PEIMs confirmed the formation of imide and ester groups. These poly(ester-imide)s exhibited high thermal and oxidative stability and very poor solubility corresponding to high viscosity. There were no reproducible endothermic or exothermic peaks found besides glass transition temperatures in the DSC thermograms. In addition, no PEIMs showed birefringent textures under the polarized light microscope. DSC and optical study indicated that Odd PEIMs and PEIM(6,10) are totally amorphous, while Even PEIMs are partially crystalline polymers with extremely slow crystallization rate. Two new compounds, BTDI-1 1 A/1 8-ol and BPDI-1 1 A/1 8-ol, with small molecular weight were designed and synthesized. The reaction of respective BTDI-1 1 A and BPDI-1 1 A with 1 -octadecanol was performed in boiling toluene with azeotropic removal of water by using Dean-Stark apparatus. DSC and optical study with polarized light microscopy indicated that BTDI-1 1 A/1 8-ol has a liquid crystalline phase that is very close to solid crystal state, whereas BPDI-1 1 A/1 8-ol has no liquid crystalline property.

Library of Congress Subject Headings

Polymer liquid crystals--Synthesis; Polymer liquid crystals--Thermal properties

Publication Date

11-1-1996

Document Type

Thesis

Department, Program, or Center

School of Chemistry and Materials Science (COS)

Advisor

Turner, Kay

Comments

Note: imported from RIT’s Digital Media Library running on DSpace to RIT Scholar Works. Physical copy available through RIT's The Wallace Library at: QD923 .A486 1996

Campus

RIT – Main Campus

Download

Share

COinS