Synthesis and Thermomechanical Properties of New AT-Phenylene R Systems
Abstract
A series of high molecular weight (550-700 amu range) bis-phenol based acetylene terminated (AT) resins were synthesized by reacting four moles of 4,4'dihalodiphenylsulfone (chloro and fluoro) with one mole of a bis-phenol (4,4'-isopropylidinediphenol, 4,4'-thiodiphenol, p,p'-biphenol, and resorcinol were used), end-capping the resulting halo-terminated products with 4-(m- hydroxyphenyl)-2methyl-3butyn-2-ol, and caustically cleaving the terminal acetone protecting groups to give free ethynyl functionalities. This synthesis produces a mixture of monomer and oligomer AT-products which were separated by column chromatography. Structural characterization of the systems was based on elemental and spectrographic (infrared and nuclear magnetic resonance (1H)) analyses. Pure AT-monomers and the monomer/oligomer mixtures produced by the outlined stoichiometry were cured at 288 C (550 F) for 8 h in air. Glass transition temperatures (Tgs) of the cured (by thermomechanical analysis) and uncured (by differential scanning calorimetry) AT-systems were measured. Thermo- oxidative stability of the resins was evaluated by isothermal aging (ITA) in air at 315 C (600 F) for 200 h. Originator furnished keywords include: Acetylene terminated; Matrix resin; and High molecular weight.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1984
- Accession Number
- ADA149961
Entities
People
- F. Arnold
- Jon W. Wallace
Organizations
- Wright Laboratory