Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ
Patent
1992-06-17
1995-03-21
McCamish, Marion S.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
264204, 264207, 264 53, 4283157, 521 505, 521 64, 522 3, 522 81, 522183, B29C 4124, B29C 4150, B29K10504, C08J 914
Patent
active
053993047
ABSTRACT:
The present invention is directed to improving thermoplastic and cross-linked polymeric networks. The inventive method comprises forming the polymeric network under gravitational conditions comprising from about 10.sup.-6 to about 10.sup.-2 g. Three modes of energy transfer have been recognized, inter alia, conduction, convection, and radiation. Polymeric networks formed under microgravity conditions (defined herein as gravitational conditions comprising from about 10.sup.-6 to about 10.sup.-2 g) do not obviate conduction and radiation modes of energy transfer. Convection energy transfer, however, is gravity dependent. Thus, convection currents can be suppressed in thermoplastic and cross-linked polymeric networks during network formation by forming the network under microgravity conditions. Suppression of convection currents reduces the incidences of voids in solvent cast thermoplastic polymeric membranes, which forms yet another aspect of the present invention. Particulate-filled thermoplastic and cross-linked polymeric networks will exhibit a more homogeneous distribution of particulates in the network by forming the network under microgravity conditions also, which forms yet a further aspect of the present invention.
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Jelinek Frank J.
Knox Jack R.
McGinnis Vincent D.
Whitmore, Jr. Robert S.
Battelle (Memorial Institute)
Chapman Mark A.
McCamish Marion S.
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