Polymer gel manufacturing methods

Details Polymer gel manufacturing methods Polymer gel manufacturing methods

1989-10-19

1993-02-02

Teskin, Fred

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

Synthetic resins

Treating polymer containing material or treating a solid...

528499, 521 82, 521142, 521149, 524555, 524556, 526909, 526930, C08F 604

Patent

active

051838796

ABSTRACT:
Disclosed are a polymer gel in which a phase transition occurs due to a stimulus, a method of manufacturing such a polymer gel, and an actuator which employs such a polymer gel. The polymer gel which is formed by polymerizing monomers at a temperature equal to or less than a phase transition temperature of the resultant polymer gel and separating and/or classifying the polymer gel into fractions according to its size at a temperature equal to or greater than the phase transition temperature thereof. Alternatively, the polymer gel is separated and/or classified into fractions by adding a low molecular weight compound that can dissolve and swell the polymer gel to separate the polymer gel into fractions based upon a difference in dissolving rate or swelling rate. Alternatively separation and/or classification of the polymer gel is performed by a combination of the above-described two methods. In consequence, the resultant polymer gel has an average particle size ranging from 0.1 .mu.m to 100 .mu.m, and exhibits standard deviation of within 25 % of the average particle size. The width of the phase transistion peak of the resultant polymer gel as measured by DSC at a heating rate of 1 .degree.C./min is within 10 .degree.C. % of the

REFERENCES:
patent: 2953546 (1960-09-01), Thomas et al.
patent: 3720534 (1973-03-01), Macaulay et al.
patent: 4059552 (1977-11-01), Zweigle et al.
patent: 4981625 (1991-01-01), Rhim et al.

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