Authors:Virág Somogyi, Tamás L. Horváth, István Tóth, Tibor Bartha, László Vilmos Frenyó, Dávid Sándor Kiss, Gergely Jócsák, Annamária Kerti, Frederick Naftolin, and Attila Zsarnovszky
Avissar-Whiting , M. , Veiga , K. R. , Uhl , K. M. , Maccani , M. A. , Gagne , L. A. , Moen , E. L. and Marsit , C. J. ( 2010 ): BisphenolA exposure leads to specific microRNA alterations in placental cells . Reprod. Toxicol. 29 , 401
Thermal properties of 4,4′(2,2′-propylidene)-diphenol, referred to as bisphenol A, or BPA, are discussed. Parameters of thermal transitions were measured by DSC. The commercial product crystallizes in α-form crystals which melt at 157°C (onset) and 161°C (peak) with a heat of fusion 134.37 J g−1. Supercooled BPA shows a glass transition at about 40°C. Almost identical results were obtained for samples recovered by different methods: flakes, pastilles and prills. Two new polymorphs, the β and γ-forms were identified. The β-form melts at 131°C with a heat of fusion of 104.9 J g−1. The melting point of the γ-form was measured to be 138°C and its heat of fusion is 118.3 J g−1. Thermal conductivity of crystalline BPA was measured.
BisphenolA (BPA) is an organic synthetic compound with the chemical formula C 15 H 16 O 2 and structural formula as in Figure S1 belonging to the group of diphenylmethane derivatives and bisphenols, with two
Epoxy resins, namely diglycidyl ether bisphenol-A (DGEBA) and carboxylated polyester (CPE), are versatile materials used in powder coatings. Such powder coatings are called hybrid coatings, where they are
Authors:Chinnaswamy Thangavel Vijayakumar, Rajendran Surender, Kumaraswamy Rajakumar, and Sarfaraz Alam
/diallyl bisphenol-A resin system. They observed that when the clay concentration increases, the gelation and rheological behavior of the prepolymer differs. The fillers are also used as modifier to toughen the BMI resin. Jana et al. [ 15 ] studied the exfoliation of
Thermal degradation of poly(2,2′,-propane-bis-4-phenyl carbonate) or bisphenol A polycarbonate (PC) alone and in presence of metal oxide as additives have been discussed. Thermal degradation of PC in presence of metal oxide additives may be surface induced catalytic thermo-oxidative degradation. Some metal oxides retard thermo-oxidative degradation of PC.
Bisphenol-A polycarbonate (BAPC) was crystallised by exposure to acetone vapours for a period of 9 h; it developed a 20% crystallinity
according to WAXS measurements. The samples of semi-crystalline BAPC were then submitted to a series of thermal treatments
including annealing, self-nucleation and subsequent isothermal crystallizations. The results showed that the polymer possesses
a remarkable crystalline memory and a much faster recrystallization and reorganization capacity (lamellar thickening) than
its very low thermal crystallization rate. This peculiar crystallization behaviour probably stems from its rigid backbone
Authors:F. Fraga, V. Soto, E. Rodríguez-Núñez, J. Martínez-Ageitos, and V. Rodríguez
The study of the cure reaction of the epoxy
network diglycidyl ether of bisphenol A with amantidine is a useful tool to
characterize the industrial behaviour of this material. The total enthalpy
of reaction, the glass transition temperature and the partial enthalpies at
different cured temperatures have been determined using differential scanning
calorimetry in dynamic and isothermal mode. Two models, one based on chemical
kinetics and the other accounting for diffusion were used and compared with
experimental data. It can be seen that the inclusion of a diffusion factor
in the kinetic model is negligible.