Oriented crystallization of polymers

Details Oriented crystallization of polymers Oriented crystallization of polymers

1975-01-23

1977-04-26

Levin, Stanford M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Treating polymer containing material or treating a solid...

260 336R, 260 336UA, 260 78S, 526351, 526352, 528502, C08F 606

Patent

active

040202666

ABSTRACT:
Crystalline polymer fibrils having a highly ordered crystalline core surrounded by less ordered crystalline polymer are produced by causing a solution of the polymer to flow through a gauze. The solution is at a temperature below the dissolution temperature of the polymer but above the temperature at which the polymer will crystallize spontaneously in an unstirred solution. The flow rate is selected in relation to the gauze dimensions to impart a sufficiently high longitudinal velocity gradient to the solution flowing through the gauze, preferably about 10.sup.2 sec.sup..sup.-1 or greater.

REFERENCES:
patent: 2988782 (1961-06-01), Parrish et al.
patent: 3431242 (1969-03-01), Waters et al.
patent: 3743272 (1973-07-01), Nowotny et al.
patent: 3882095 (1975-05-01), Fowells et al.

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