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PET Filaments with Radially-Differentiated Structure

Textile Research Institute, and Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08540, U. S. A.

L. Rebenfeld

Textile Research Institute, and Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08540, U. S. A.

M.G. Scott

Textile Research Institute, and Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08540, U. S. A.

H.-D. Weigmann

Textile Research Institute, and Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08540, U. S. A.

An undrawn polyester monofilament was subjected to sequential solvent and thermal/stress crystallization during drawing to produce a radially-differentiated structure. Solvent-induced crystallization of outer regions of the filament was achieved using methylene chloride or dimethylformamide at room temperature. The thermal/stress crystallization of the filament core was conducted at a draw ratio of 4.0 at temperatures ranging from 90 to 120°C. The resulting filaments were characterized by measurements of density and mechanical properties, by wide-angle x-ray diffractometry, and by scanning electron microscopy. The structure of the outer regions of these novel filaments consists of highly- deformed spherulites, while the inner core is fibrillar in character with well-developed orientation and crystallinity. The extreme outer surface appears to be cavitated, leading to extremely high surface areas. It is proposed that such radially- differentiated filaments will have the combined desirable properties of spherulitic and fibrillar morphologies, such as high liquid-retention values, improved adhesion, and high strength.

Textile Research Journal, Vol. 49, No. 11, 652-661 (1979)
DOI: 10.1177/004051757904901106


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