Master of Science
Materials Science and Engineering
Raymond A. Pearson
Nylon manufacturers provide one-size-fits-all recommendation for drying resin regarding temperature and time. This directive is generic considering the various types of nylons produced for various applications in automotive, sports, leisure, domestic appliances, and optics. Field experts and consultants provide vague points on the importance of drying nylons before processing, what temperatures to use, and how to avoid over drying. Determining an effective drying method for nylon resins and parts begins with understanding the degradation mechanisms associated with water absorption. The degradation mechanisms include plasticization, hydrolysis, and thermal oxidation. Another factor to consider is the effect of additives, fillers, and chemical structure on absorption behavior. This information provides a base for the qualitative analysis of water absorption and desorption behavior on specialty polyamides products such as unreinforced PA6, 50% glass reinforced PA6, 50% glass reinforced PA66+PA6, PA MACM12, 50% glass reinforced PA12, PA6I/6T, and 50% glass reinforced PA66+PA6I/X. These products share behavior indicative of their polyamide base as well as exhibit unique characteristics influenced by their composition.
Brown, Michelle Denison, "Moisture Absorption and Desorption Effects on Mechanical Behavior in Specialty Polyamide Products" (2019). Theses and Dissertations. 5637.