Abstract
Polycrystalline spherulites and microfibrils are obtained from a substituted para-linked polyamide [COPh(Ph)CONHPh(Me)Ph(Me)NH] n in a supercritical antisolvent (SAS) process. CO 2 is contacted with 0.03-O.12 wt % polymer in DMSO and in DMF solutions in both batch and continuous modes of operation. Slow expansion of the solution produces polycrystalline spherulites in the 1-10-μm-diameter range, and the degree of crystallinity is affected by turbulence caused by CO 2 injection. A microfibrillar structure is obtained by spraying the polymer solution through a small orifice into cocurrently flowing supercritical CO 2
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