Thesis Details

Thesis Title: The Properties, Morphology, and Stability of Multifilament Polypropylene Yarn Containing Post-Consumer Recycled Resin
Thesis Author: Gregory Coy
Abstract: In an effort to increase the national rate of recycling, the EPA has proposed that certain products that can be made from recycled materials be required to contain a minimum percentage of post-consumer raw material. Items listed by the EPA that are of particular interest to the textile industry include polypropylene geotextiles. The possibility of such legislation has presented the need for geotextile manufacturers to investigate the use of post-consumer polypropylene in producing yarn for geotextile fabrics. This research investigated three sources of post-consumer polypropylene waste; waste recycled from polypropylene bottles, waste from recycled automobile battery cases, and waste recycled from polypropylene fabric. Multifilament yarn was produced from each waste source at increasing concentration levels with virgin polypropylene resin. Additional process stabilizers and hindered amine light stabilizers (HALS) were used to counter oxidative degradation and improve the performance of the yarns produced. Each of the three post-consumer waste sources, in blends with virgin resin, produced yarn with comparable physical properties to yarn produced from 100 percent virgin resin. Yarn produced from resin blends containing bottle waste and fabric waste exhibited comparable light stability and thermal stability to yarn produced from 100 percent virgin resin. The addition of process stabilizers and HALS was shown to improve the processability and performance of resins containing post-consumer waste.