title: From oligomers to molecular giants of soybean oil in supercritical carbon dioxide medium: 1. Preparation of polymers with lower molecular weight from soybean oil.
abstract: Polymers with a low molecular weight derived from soybean oil have been prepared in a supercritical carbon dioxide medium by cationic polymerization. Boron trifluoride diethyl etherate was used as an initiator. Influences of polymerization temperature, amount of initiator, and carbon dioxide pressure on the molecular weight were investigated. It is shown that the higher polymerization temperature favors polymers with relatively higher molecular weights. Larger amounts of initiator also provide polymers with higher molecular weights. Higher pressure favors polymers with relatively higher molecular weights. The applications of these soy-based materials will be in the lubrication and hydraulic fluid areas.
authors.affiliation: Food and Industrial Oil Research, National Center for Agricultural Utilization Research, Agricultural Research Service, U. S. Department of Agriculture, 1815 North University Street, Peoria, Illinois 61604, USA. liuz@ncaur.usda.gov
authors.forename: Zengshe
authors.initials: Z
authors.lastname: Liu
authors.forename: Brajendra K
authors.initials: BK
authors.lastname: Sharma
authors.forename: Sevim Z
authors.initials: SZ
authors.lastname: Erhan
mesh_terms: D001671:Biochemistry / Q000379:methods*; D002245:Carbon Dioxide / Q000737:chemistry; D002384:Catalysis; D002412:Cations; D053138:Cyclohexenes / Q000737:chemistry; D046911:Macromolecular Substances / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D008956:Models, Chemical; D008968:Molecular Conformation; D008970:Molecular Weight; D009821:Oils; D011108:Polymers / Q000737:chemistry*; D011312:Pressure; D013024:Soybean Oil / Q000378:metabolism*; D013696:Temperature
chemical_list: D002412:Cations; D053138:Cyclohexenes; D046911:Macromolecular Substances; D009821:Oils; D011108:Polymers; D002245:Carbon Dioxide; D013024:Soybean Oil