Synthesis and Characterization of Soluble Transparent and Cross-linkable Polyimides

  • 劉 國全

Student thesis: Master's Thesis

Abstract

A hydroxyl-containing polyimide (PI) based on 4 4'-(Hexafluoroisopropylidene) diphthalic anhydride (6-FDA) and 2 2-Bis(3-amino-4 hydroxyphenyl) hexafluoropropane (Bis-APAF) was successfully synthesized using the one-step high-temperature polycondensation method to obtain a soluble transparent and cross-linkable PI All its solubility thermal properties mechanical properties and optical properties were investigated In order to enhance the chemical resistance of PI the PI could be cross-linked chemically and underwent a cross-linked reaction with three different cross-linkers including 1 4-phenylene diisocyanate (1 4-PDI) 4 4'- oxybis (phenyl isocyanate) and resorcinol diglycidylether cross-linkers The chemical structures of the polyimide and cross-linked polyimides were confirmed using FTIR spectra The PI showed excellent solubility in common organic solvents good mechanical properties (tensile strength of 51 06 MPa) an optical transparency of approximately 90% (89 37%) at a wavelength of 550 nm and it can convert to polybenzoxazole (PBO) at high temperatures The inherent viscosity of the PI was 0 35 dL/g as measured in N N-dimethylacetamide (DMAc) solvent at 30oC The cross-linked membranes showed good chemical resistance in organic solvents and higher tensile properties (tensile strength exceeding 76 02 MPa) as compared to the pure PI but showed inferior optical properties that were reduced after cross-linking reaction The 1 4-PDI 4 4'- oxybis (phenyl isocyanate) cross-linkers enhanced the thermal properties of the membranes while the 4 4'- oxybis (phenyl isocyanate) cross-linker reduced them
Date of Award2018 Jan 30
Original languageEnglish
SupervisorLien-Chung Hsu (Supervisor)

Cite this

Synthesis and Characterization of Soluble Transparent and Cross-linkable Polyimides
國全, 劉. (Author). 2018 Jan 30

Student thesis: Master's Thesis