FLUORINE-CONTAINING CONDENSATION POLYMERS AND RESINS. Quarterly Progress Report No. 4 for June 1, 1959 to September 1, 1959
Preparation of intermediates such as maleimide, 2,2-difluoropropane-1,3- diol, diethyl dichlorormaleate, and perfluoroglutaronitrile is reported. It was found that varying the peroxide catalyst concentration between 0.5 and 2.0% had a relatively minor effect on the room temperature or elevated temperature (26O deg C) flexural strengths of fluorinated glycol polyester laminates. The same was true for laminates prepared from the corresponding hydrocarbon glycols. The usual polyesters are made with fumaryl chloride and isophthaloyl chloride (ratio 3 to 1). The isophthalate segments are added to reduce the crystallinity and melting points of the polyesters and thus simplify the laminating procedure. It was hoped, that by reducing the number of isophthalate segments, a higher cross- linking density would be obtained, which would be reflected in higher initial flexural strengths. When the number of isophthalate fragments was decreased it was necessary to use higher laminating temperatures and the resulting laminates had lower initial flexural strengths. Varying the ratio of fluorinated glycol polyester to triallyl cyanurate between 75: 50 and 50: 150 had no profound effect on the aging characteristics of the laminates; howewer, ratios in the neighborhood of 50: 50 appear optimal. Preliminary results indicate that fluorinated glycol polyester laminates cross-linked with triallyl cyanurate- maleimide mixtures have initial flexural strengths of 60,000 to 70,000. These may be compared with 40,000 to 45,000 for laminates prepared from triallyl cyanurnte. The maleimide-triallyl cyanurate laminates also show improved flexural strengths after aging 100 bours at 260 C. Testing of hexafluoropentane diol polyester-triallyl cyanurate laminates after aging at 316 deg C reveals indications of rapid deterioration. However, the laminates retain appreciable room temperature strength after 35 hours. Synthetic work on noval fluorine-containing intermediates was continued. (auth)
- Research Organization:
- Hooker Chemical Corp., Niagara Falls, N.Y.
- NSA Number:
- NSA-14-000089
- OSTI ID:
- 4221673
- Report Number(s):
- NP-7937
- Country of Publication:
- United States
- Language:
- English
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FLUORINE-CONTAINING CONDENSATION POLYMERS AND RESINS. Period covered : February 1, 1959 to January 1960
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Related Subjects
ALLYL RADICALS
CATALYSIS
CHEMICAL REACTIONS
CHEMISTRY
CHLORINATED HYDROCARBONS
CYANIDES
CYANURATES
DECOMPOSITION
ESTERS
ETHYL RADICALS
FLUORINATED HYDROCARBONS
FLUORINATION
GLUTARIC ACID
HYDROCARBONS
HYDROGEN PEROXIDES
IMIDES
LIQUEFYING
MALEIC ACID
NITRILES
NITROGEN COMPOUNDS
ORGANIC ACIDS
ORGANIC NITROGEN COMPOUNDS
POLYESTERS
POLYMERS
PREPARATION
PROPANE
RESINS
TESTING