Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1975-12-17
1977-05-31
Phynes, Lucille M.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260340, C08G 210, C07D32306
Patent
active
040268730
ABSTRACT:
Needle-like single-crystals of polyoxymethylene are obtained directly from a monomer, trioxane, in the course of polymerization in solution. The method for obtaining the crystals comprises preparing an anhydrous, dilute solution of trioxane in non-polar solvents, adding thereto a specified amount of boron trifluoride or its ether complex derivatives as catalyst and subsequently adding a small specified amount of water as co-catalyst, and maintaining the mixture unstirred at a fixed temperature.
The needle-like crystals, measuring 5 to 100 microns long and 1 to 3 microns across, are single crystals having a hexagonal cross-section and constituted of molecular chains extended and aligned in the direction of length with full three dimensional regularity. This single-crystal is believed to be the first example of a `polymer whisker`.
REFERENCES:
patent: 2989508 (1961-06-01), Hudgin
patent: 2989510 (1961-06-01), Bruni
patent: 3156671 (1964-11-01), Suter et al.
patent: 3200096 (1965-08-01), Hudgin
patent: 3242063 (1966-03-01), Okamura et al.
patent: 3438883 (1969-04-01), Marans et al.
patent: 3839290 (1974-10-01), Babare et al.
Agency of Industrial Science & Technology
Phynes Lucille M.
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