Thesis Details


Thesis Title: Thermoplastic Polyacrylonitrile
Thesis Author: Robert Shawn Hutchinson
Abstract: The objective of this research is to understand the structure, melt behavior, and fiber properties of Amlon® D, part of a family of thermoplastic high acrylonitrile (PAN) copolymer resins. A proposed crystal morphology model based on predicted and observed comonomer sequence lengths and melting behavior is presented. Thermograms of basic melt behavior demonstrate there is melting, but surprisingly no evidence of a first-order phase transition is observed. Time-temperature stability and flow behavior was used to gain an understanding of processing parameters. Thermogravimetric analysis with mass spectrometry was used to study the stability. A capillary rheometer was used to obtain detailed rheology data employing a range of die sizes, melt times and shear rates. Monofilaments were extruded using a single bore device with a range of spin draw and draw ratios. Fiber tenacity and elongation were measured to assess the efficacy of processing conditions. The solid state behavior of the polymer is characterized and correlated with the mechanical properties using wide angle x-ray diffraction and differential scanning calorimetry analyses.