title: Study of polymeric systems based on 2,2 bis-4(2-hydroxy-3-methacryloyl-oxypropoxy) phenyl propane.
abstract: 2,2 bis-4(2-hydroxy-3-methacryloyloxypropoxy) phenyl propane is the basic monomer for a large number of proprietary dental composite filling materials. In this paper, studies have been made of its copolymers with various comonomers. 2,2 bis-4(2-hydroxy-3-methacryloyloxypropoxy) phenyl propane--tetrahydrofurfuryl methacrylate copolymers, at about the 95/5% v/v level, showed an enhanced modulus over that of the test material itself, to give a Young's modulus of -4.8 GPa. This reflected an enhanced activation energy of the glass transition temperature, indicating a very specific free volume effect of the diluent monomer. Further studies 2,2 bis-4(2-hydroxy-3-methacryloyloxypropoxy) phenyl propane-tetrahydrofurfuryl methacrylate room temperature polymerized copolymers showed that enhanced modulus could be achieved by including in the system small amounts of inhibitor; 0.3% v/v 2,6 di-tertiary butyl phenol elevated the Young's modulus of a benzoyl peroxide--NN-dihydroxy ethyl p-toluidine cured system from 3.1 to 3.6 GPa. Such resins may be useful in improved dental fissure sealants and composite filling materials.
authors.affiliation: Dental School of the Royal London Hospital Medical College, UK.
authors.forename: K W
authors.initials: KW
authors.lastname: Davy
authors.forename: M
authors.initials: M
authors.lastname: Braden
mesh_terms: D001585:Benzoyl Peroxide / Q000737:chemistry; D017438:Bisphenol A-Glycidyl Methacrylate; D001840:Dental Bonding; D003764:Dental Materials; D003793:Dental Restoration, Permanent; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry*; D011108:Polymers; D013696:Temperature
chemical_list: D003764:Dental Materials; D008689:Methacrylates; D011108:Polymers; D017438:Bisphenol A-Glycidyl Methacrylate; D001585:Benzoyl Peroxide