Solid State Extrusion of Nylons 11 and 12; Processing, Morphology and Properties.
Abstract
Monofilaments of poly(11-amino-undecanoic acid) (nylon 11) and poly-(laurylactam) (nylon 12) have been produced via solid state extrusion in an Instron capillary rheometer. The resulting morphology plus physical and mechanical properties were investigated. For nylon 11, crystalline melting point (Tm) increased 16 C at an extrusion ratio (ER) of 12, over the undrawn material, while percent crystallinity (Xc) was up 23%. Nylon 12, extruded to a maximum ER of 6, realized an increase in Tm of 4 C at ER=5 and an Xc increase of 14%. Young's modulus for nylon 11 increased from 3 GPa at an ER equal 3 to 5.5 GPa at an ER equal 7, then levelled off at higher draw. For nylon 12, the value climbed from 2.5 at ER equal 3 to approx. 3.3 GPa at ER equal 5.5. Conventionally melt-spun and cold-drawn nylon 11 fibers exhibit a Young's modulus of 2.7 GPa; nylon 12 fibers, 2.9 GPa. Atmospheric moisture loss was found not to affect solid state extrusion of these higher nylons. Increases in extrusion temperature and/or pressure increased extrusion rate.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 14, 1979
- Accession Number
- ADA079125
Entities
People
- Roger S. Porter
- William G. Perkins
Organizations
- University of Massachusetts Amherst