Potential structure acrylates

A recent reference [1] lists twenty suppliers of structural acrylic adhesives. Many other companies have been involved in this area, and it is often felt that acrylic adhesives have unrealized technical potential [2]. Acrylic adhesives are not commonly found in the consumer market, but fill an important niche there in the bonding of rear view mirrors to windshields in automobiles. 

Thermal expansion differences exist between the tooth and the polymer as well as between the polymer and the filler. The tooth has a thermal expansion coefficient of 11 x 10-6/°C while conventional filled composites are 2-4 times greater [63, 252], Stresses arise as a result of these differences, and a breakdown between the junction of the restoration and the cavity margin may result. The breakdown leads to subsequent leakage of oral fluids down the resulting marginal gap and the potential for further decay. Ideal materials would have nearly identical thermal expansion of resin, filler, and tooth structure. Presently, the coefficients of thermal expansion in dental restorative resins are controlled and reduced by the amount and size of the ceramic filler particles in the resin. The microfilled composites with the lower filler loading have greater coefficient of thermal expansions that can be 5-7 times that of tooth structure. Acrylic resin systems without ceramic filler have coefficients of thermal expansion that are 9 times that of tooth structure [202-204, 253],... 

Potential Anaerobic and Structural Acrylic Modified Polyester Adhesives... 

An alternate adhesive application area for the polyester acrylates described in this report was in the general field of two-part structural acrylics. Such systems generally cured at room temperature using transition metal or amine-activator and a hydroperoxide or peroxide radical source. A brief study was carried out to determine if the synthesized compounds had potential use as structural adhesives. As before, the nut/bolt combination was used as an indication of adhesion. The results of these limited tests are given in Table 3. 

Several authors have discussed the ion exchange potentials and membrane properties of grafted cellulose [135,136]. Radiation grafting of anionic and cationic monomers to impart ion exchange properties to polymer films and other structures is rather promising. Thus, grafting of acrylamide and acrylic acid onto polyethylene, polyethylene/ethylene vinyl acetate copolymer as a blend [98], and waste rubber powder [137,138], allows... 

Hydroxypropionic Acid (3-HPA). Like the structurally isomeric lactic acid, 3-HPA constitutes a three-carbon building block with the potential of becoming a key intermediate for a variety of high-volume chemicals malonic and acrylic acids, methacrylate, acrylonitrile, 1,3-propanediol, and so forth.Thus, Cargill is developing a low-cost fermentation route by metabolic engineering of the microbial... 

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