Ethacrylic acid

Seki and Tirrell [436] studied the pH-dependent complexation of poly(acrylic acid) derivatives with phospholipid vesicle membranes. These authors found that polyfacrylic acid), poly(methacrylic arid) and poly(ethacrylic acid) modify the properties of a phospholipid vesicle membrane. At or below a critical pH the polymers complex with the membrane, resulting in broadening of the melting transition. The value of the critical pH depends on the chemical structure and tacticity of the polymer and increases with polymer hydro-phobicity from approximately 4.6 for poly(acrylic acid) to approximately 8 for poly(ethacrylic acid). Subsequent photophysical and calorimetric experiments [437] and kinetic studies [398] support the hypothesis that these transitions are caused by pH dependent adsorption of hydrophobic polymeric carboxylic acids... 

Fig. 4. pH-dependent reorganization of phospholipid vesicle membranes by poly(ethacrylic acid). Tirrell DA (1990). In Kost J (ed) Pulsed and self-regulated drug delivery, CRC Press, Boca Raton FL, p 109. Reproduced with permission... 

Methyl methacrylate is only one of a family of monomers, including the various esters of acrylic, methacrylic, and ethacrylic acids, which are polymerized to produce the thermoplastic resins known as the acrylates. A wide variety of reactions and starting materials may be utilized for their production however, the principal commercial product is polymethyl methacrylate, sold by Du Pont and Rohm Haas under the trade names of Lucite and Plexiglas, respectively. These materials were introduced to the United States market in 1936 (44) and have received widespread acceptance due principally to their outstanding optical properties. Production in 1949 was reported as about 22,000,000 to 25,000,000 pounds and peak wartime capacity was above30,000,000 pounds. While this can account for only about 2% of the current production of propylene for chemical purposes, the acrylate resins are of considerable commercial importance as they are sold at a relatively high price and are the only materials available that will meet the requirements for certain military and civilian products. 

Sugaj S> Nitta K, Ohno N et al. Conformational studies of poly(ethacrylic acid) in aqueous salts by potentiometric, viscometric, optical and N-NMR measurements. Colloid Polym Chem 1983 261 159-165. 

Table 12. Caleulated r values for ethylene ethacrylic acid using the average copolymer ...

Acrylic Methacrylic Acid Methacrylic Methacrylic Acid Ethacrylic... 

Measurements were also carried out for three series of copolymers copolymers of styrene with methacrylic acid (S-MAA) and crosslinked copolymers of the styrene and divinylbenzene (S-DVB), those of methyl methacrylate and dimethacrylate ethylene glycol (MMA-DMEG) as well as for the set of oligom-ethacrylates, oligocarbonat and oligo-a-methyl styrenes. The preparation of samples and experimental technique were described in [31-33],... 

AA, acrylic acid MAA, methacrylic acid MA, methyl acrylate MMA, methyl methacrylate BMA, butyl methacrylate MEA, methyl ethacrylate AN, acrylonitrile MAN, methacrylonitrile S, styrene AMS, a-methylstyrene VAc, vinyl acetate VC, vinyl chloride... 

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