Synthesis and Properties of Novel Organosoluble and Low-color Poly(ether-imide)s and Poly(ether-amide)s with Triptycene Moiety
| Autor: | Ji-Shian Chou, 邱繼賢 |
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| Rok vydání: | 2011 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 99 This thesis deals with the synthesis and properties of new triptycene-containing poly(ether-imide)s and poly(ether-amide)s. Their properties such as inherent viscosity, molecular weights, film-forming ability, solubility, crystallinity, thermal and optical properties were investigated and compared with their analogs without triptycene units. The first part deals with the synthesis and characterization of aromatic poly(ether-imide)s based on a triptycene bis(ether anhydride). A series of poly(ether-imide)s containing three-dimensional triptycene moieties were prepared from 1,4-bis(3,4-dicarboxyphenoxy)triptycene dianhydride with various aromatic diamines via a conventional two-stage process that included ring-opening polyaddition to form the poly(amic acid)s followed by thermal or chemical imidization to the poly(ether-imide)s. The inherent viscosities of the poly(amic acid) precursors were in the range of 0.44-0.91 dL/g. Most of the poly(ether-imide)s showed good solubility in many organic solvents and could be solution-cast into transparent and tough films. They also showed good thermal stability with glass-transition temperatures of 238~302 oC and 10% weight loss temperatures in excess of 572 oC. These triptycene-based poly(ether-imide)s showed enhanced optical transparency, decreased color intensity and lowered dielectric constants as compared to conventional aromatic polyimides. The poly(ether-imide)s derived from trifluoromethyl-containing bis(ether amine)s could afford highly optically transparent and almost colorless films. The second part of this thesis describes the synthesis and properties of novel triptycene-containing poly(ether-amide)s from 1,4-bis(4-carboxyphenoxy)triptycene with various aromatic diamines or from 1,4-bis(4-aminophenoxy)triptycene with various aromatic dicarboxylic acids via the phosphorylation polyamidation reaction. These poly(ether-amide)s were essentially amorphous and showed a significantly increased solubility as compared with their analogs without the triptycene units. All the poly(ether-amide)s could be solution-cast into flexible and tough films. Apart from high Tg values and good thermal stability, these poly(ether-amide) films exhibited high optical transparency with an ultraviolet-visible absorption cutoff wavelength (λ0) down to 338 nm. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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