Unique Characteristics Derived From Poly(Arylene Ether Phosphine Oxide)s

Abstract

Arylene ether phosphine oxide homopolymers were prepared via nucleophilic aromatic substitution polycondensations of bis(4-ftuorophenyl)phenyl (or methyl) phosphine oxide with various aromatic bisphenols in the presence of a weak base and an aprotic dipolar solvent. These thermoplastic materials with Tg values in the range of about 200°C-285°C showed 5% weight loss in air around 500°C with substantial amounts of char yield at 800°C, which was related to their excellent' self-extinguishing characteristics relative to other engineering thermoplastics. Additionally, the presence of phosphorus in the char after such high temperature heating implied that these materials should also be resistant to aggressive oxygen plasma environments. Indeed, these systems showed extremely low amounts of etching in oxygen plasma when compared with other engineering polymers. The presence of phosphorus residues after either burning or etching with oxygen plasma could play crucial roles in areas of commercial importance and aerospace applications.

Synthesis and characterization of arylene ether imide reactive oligomers and polymers containing diaryl alkyl phosphine oxide groups

“…Nitration of 2 with a mixture of fuming nitric acid and concentrated H 2 SO 4 yielded bis(m-nitrophenyl)methyl phosphine oxide 3 which was then reduced catalytically by H 2 and Pd/C to yield bis(m-aminophenyl)methyl phosphine oxide (4, DAMPO). The melting point of DAMPO after purification was sharp (152-153°C) and much higher than the literature value (145-147°C) [10]. Monomer grade DAMPO was obtained by this synthesis route and this was verified by elemental analysis, NMR, TLC, HPLC and GC analysis.…”

“…Our previous papers have described synthesis procedures [4] and the prepara-tion of novel monomers [5,6], as well as new functionalized oligomers and polymers [3,[7][8][9]. In particular, several important features of the hydrolytically stable phosphorus carbon containing materials have been identified, including oxygen plasma resistance [10][11][12], polymer supported catalysis [13], structural adhesives [14], radiation resistance [15], and polymer blends [16]. One of our current research thrusts is to develop candidate adhesive and composite material systems based on polyimides.…”

Effect of LEO Exposure on Aromatic Polymers Containing Phenylphosphine Oxide Groups

“…Aromatic polymers containing phenylphosphine oxide groups have been under investigation for over a decade [1][2][3][4]. This functional group has been incorporated into a variety of aromatic polymers as a means of providing both solubility and high glass transition temperature (Tg) without sacrificing mechanical properties.…”

The Effect of Low Earth Orbit Atomic Oxygen Exposure on Phenylphosphine Oxide-Containing Polymers

“…Previous work has shown in both ground based [2][3][4][5] and space flight 6,7 exposure experiments that placing phenylphosphine oxide groups into the backbone of organic polymers provides the polymers with a significant increase in resistance to erosion by AO.…”