Chemistry
Adhesives Polymers Synthesized from Elemental Sulfur and Garlic Extract Components
Document Type
Poster Presentation
Location
Indianapolis, IN
Subject Area
Chemistry
Start Date
13-4-2018 2:30 PM
End Date
13-4-2018 4:00 PM
Sponsor
Courtney Jenkins (Ball State University)
Description
In petroleum refinement, sulfur compounds are extracted from the crude oil and stored as elemental sulfur (S8) to prevent formation of sulfur dioxide. About 70 billion tons are produced annually. Inverse vulcanization combines large amounts of S8 with minimal amount of monomer to form polymers. The S8 ring breaks open when heated, creating radicals than can bind to a double bonded monomers. Others have used this method to make flexible sulfur films, Li-S batteries, and metal capturing polymers. In this research, S8 is combined with garlic extract components- diallyl disulfide (DADS), diallyl sulfide (DAS) and garlic essential oil (GEO)- to make environmentally friendly, inexpensive, and solvent free adhesives. Various ratios of S8 and monomer are stirred in an oil bath for one hour at 180oC. These polymers are then spread on to aluminum adherends in a pull-down method, and overlapped in a lap shear configuration. The samples were then cured for 24 hours at 160oC. Pre-cure polymers were characterized using gel permeation chromatography, which showed increased molecular weight when cured overnight. Differential scanning calorimetry showed higher glass transition temperature as polymers were cured at higher temperatures. Proton NMR showed minimal difference between pre and post-cure polymers, noting minimal amounts of monomer. Adhesion strength of post-cure polymers were tested on Instron Materials Testing System. Preliminary data shows that larger amounts of S8 in adhesives gives higher adhesion strength. Here we have shown that a natural adhesive can be made by using a renewable monomer and petroleum waste product.
Adhesives Polymers Synthesized from Elemental Sulfur and Garlic Extract Components
Indianapolis, IN
In petroleum refinement, sulfur compounds are extracted from the crude oil and stored as elemental sulfur (S8) to prevent formation of sulfur dioxide. About 70 billion tons are produced annually. Inverse vulcanization combines large amounts of S8 with minimal amount of monomer to form polymers. The S8 ring breaks open when heated, creating radicals than can bind to a double bonded monomers. Others have used this method to make flexible sulfur films, Li-S batteries, and metal capturing polymers. In this research, S8 is combined with garlic extract components- diallyl disulfide (DADS), diallyl sulfide (DAS) and garlic essential oil (GEO)- to make environmentally friendly, inexpensive, and solvent free adhesives. Various ratios of S8 and monomer are stirred in an oil bath for one hour at 180oC. These polymers are then spread on to aluminum adherends in a pull-down method, and overlapped in a lap shear configuration. The samples were then cured for 24 hours at 160oC. Pre-cure polymers were characterized using gel permeation chromatography, which showed increased molecular weight when cured overnight. Differential scanning calorimetry showed higher glass transition temperature as polymers were cured at higher temperatures. Proton NMR showed minimal difference between pre and post-cure polymers, noting minimal amounts of monomer. Adhesion strength of post-cure polymers were tested on Instron Materials Testing System. Preliminary data shows that larger amounts of S8 in adhesives gives higher adhesion strength. Here we have shown that a natural adhesive can be made by using a renewable monomer and petroleum waste product.