Y. Shibasaki, Akiko Seki, Namiko Takeishi
Apr 3, 1995
Citations
0
Influential Citations
3
Citations
Journal
Thermochimica Acta
Abstract
Abstract The anchoring effects of the COOH group on the surface of metals (Al, Ag and Au) in the thermal polymerization of long-chain diynoic acids (heptadeca-10, 12-diyonic acid, tricosa-10,12-diynoic acid and nonacosa-10,12-diynoic acid) have been investigated by micro DSC measurements. When the mass of the sample was smaller than 0.01–0.02 mg, the molar heat of fusion estimated from the peak area in the first heating curves increased abruptly up to two or three times the normal values, although the values increased with the length of the ϖ-chain in diynoic acids. On the contrary, the polymerizability of diynoic acids was markedly enhanced when the mass of sample was smaller than 0.2–0.3 mg. However, in the case of gold foils which had been cleaned by a series of chemical treatments which altered the chemical property of the gold surface from hydrophilic to hydrophobic, no acceleration of the addition polymerization of diynoic acids was observed. It is concluded that these results are attributable to the anchoring of the COOH group on the metal surface by chemisorption, i.e. salt formation or hydrogen bonding.