Novel phosphorus containing polymers

The character of the residues from pyrolytic decomposition of organo‐phosphorus polymers has suggested the use of such materials in ablative materials required for heat shields in reentry vehicles, rocket nozzles, etc. Phosphorus‐containing phenolic resol and novolak resins were prepared by condensing di(p‐hydroxyphenyl)‐phenyl‐(phosphine oxide) with aldehydes. The mechanical properties of the basic phosphorus‐phenolics were improved by internal plasticization through chemical reaction of the resin in the early stages of polycondensation with acrylonitrile‐butadiene copolymers (NBR) and with silences and slicone resins. To improve the compatibility of the phosphorus phenolics with NBR copolymers, the phosphorus‐containing phenolics were initially etherified by “butanolization” in order to decrease their polarity. The preparation of coatings and molded discs from some modified and unmodified phosphorus‐containing phenolic‐resin formulations is described. Preliminary observations relating to the properties of the trial products are reported.

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Phosphorus‐containing phenolic resins

Kindley

Filipescu

Παππάς

et al. 1964

Polymer Engineering & Sci

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Phosphorus‐containing polyurethans

Dyer

Dunbar

1970

J. Polym. Sci. A‐1 Polym. Chem.

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Phosphorus‐containing polyurethans of the formula were prepared by interfacial polymerization of 1,4‐butanebischloroformate and p‐xylylene‐α, α‐bischloroformate with bis(m‐aminophenyl)alkylphosphine oxides. The polymers had number average molecular weights up to 8600. A test of the stability to alkali of one of the polymers (RCH3, X1,4‐C6H4) showed it to be as resistant as nonphosphorus analogs, and a film of this polymer exhibited self‐extinguishing properties. Thermal degradation of the phosphorus polymers, which began at approximately 230°C, occurred by an initial first‐order process, releasing chiefly carbon dioxide. The energies of activation for the maximum rates of weight loss were 31–37 kcal/mole.

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Tris(hydroxymethyl)phosphine oxide – synthesis, chemistry, and applications

Moiseev

2024

Phosphorus, Sulfur, and Silicon and the Related Elements

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Novel phosphorus containing polymers

Cited by 3 publications

References 1 publication

Phosphorus‐containing phenolic resins

Phosphorus‐containing phenolic resins

Phosphorus‐containing polyurethans

Tris(hydroxymethyl)phosphine oxide – synthesis, chemistry, and applications

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