Electric Literature of 18959-30-3, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.18959-30-3, Name is 4,5-Difluorophthalic Anhydride, molecular formula is C8H2F2O3. In a Article£¬once mentioned of 18959-30-3
A study of the thermal cure of new trifunctional phenylethynyl terminated imide oligomers with reduced cure temperatures
A series of novel trifunctional phenylethynyl terminated imide oligomers was synthesized from two new triamines, 1,3,5-tris(3-aminophenoxy-4?- benzoyl)benzene (m-TABB) and 1,3,5-tris(4-aminophenoxy-4?-benzoyl)benzene (p-TABB), and systematically compared with the corresponding bifunctional phenylethynyl terminated imide oligomer, BPEPA. DSC isothermal cure kinetics studies were performed at the cure temperature of 320C, 350C, and 370C by applying two different kinetic equations, and in these cases the reaction kinetics followed first order reactions below 90% conversion. The rate of the curing reaction was observed to increase with the number of functional groups, and the TABB-based oligomers showed 20C lower curing temperature than the BABB-based oligomer. Tgs and thermal oxidative stabilities of imide films increased with increasing the number of the functional groups in a molecule, which may partly due to the higher crosslink densities. Moreover, trimerization or tetramerization, possible main curing reaction of trifunctional phenylethynyl terminated oligomers, based on the kinetic analysis by isothermal and ramp temperature DSC and calculation of crosslink densities, formed more thermooxidatively stable aromatic ring structures than the main polyene structures appeared in monofunctional or bifuntional phenylethynyl terminated model compounds. m-TABB-based resin exhibited the best combination of melt processibilities, curing temperatures, and thermal properties.
We¡¯ll also look at important developments in the pharmaceutical industry because understanding organic chemistry is important in understanding health, medicine, the role of 18959-30-3, and how the biochemistry of the body works.Electric Literature of 18959-30-3
Reference£º
Benzofuran – Wikipedia,
Benzofuran | C8H2952O – PubChem