Date of Award
Spring 5-2018
Document Type
Thesis
Degree Name
Master of Science (MS)
Department
Chemistry
First Advisor
Dr. Ram Gupta
Second Advisor
Dr. Khamis Siam
Third Advisor
Dr. Pawan Kahol
Fourth Advisor
Dr. John Franklin
Keywords
Polyols, thiol-ene reaction, physicomechanical properties, flame retardance
Abstract
Polyurethane is an important class of polymer which is being used for various industrial applications in the form of rigid foams, flexible foams, thermoplastic, elastomer, coating, and adhesive. Especially there is a huge market for rigid polyurethane foams for their applications as thermal insulating material in building and housing. In general, polyurethanes are prepared using polyols and diisocyanates. Most of the polyols used by industries are petrochemical based. In this project, a novel polyol from an orange peel oil-based derivative, limonene dimercaptan, was synthesized using one step photochemical thiol-ene reaction. The synthesized polyol was used to prepare flame retardant polyurethane foams using dimethyl methyl phosphonate (DMMP) as an additive flame retardant (AFR) and a new bromine containing reactive flame retardant (RFR) derived from 2,4,6-tribromophenol. The foams using DMMP with phosphorus loading of 0, 0.23, 0.45, 0.90, 1.3, and 1.7 wt% and bromine-polyol with a bromine content of 0, 4.0, 4.5, 5.0, 5.5, and 6.0 wt% were prepared and analyzed. Our results suggest that prepared polyurethanes showed moderate density and high closed cell content. Both flame retardants lead to rigid polyurethane foams with excellent physicomechanical properties with a short self-extinguishing time and low weight loss after burning test. The reactive bromine-polyol leads to rigid polyurethanes with better physicomechanical properties than those of foams based on AFR, but the flame retardant properties of foams prepared using AFR are superior to the foams prepared using bromine-polyol (RFR). From the overall observations, the bio-based polyurethane foams showed efficient flame retardant properties and can be used as flame retardant foam for various applications.
Recommended Citation
Zhang, Chunyang, "HIGHLY FLAME RETARDANT AND BIO-BASED RIGID POLYURETHANE FOAMS DERIVED FROM ORANGE PEEL OIL" (2018). Electronic Theses & Dissertations. 412.
https://digitalcommons.pittstate.edu/etd/412
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Materials Chemistry Commons, Organic Chemistry Commons, Polymer and Organic Materials Commons, Polymer Chemistry Commons, Polymer Science Commons