SYNTHESIS AND RHEOLOGICAL STUDY OF SOME MALEIC-ACID AND FUMARIC-ACID STEREOREGULAR POLYESTERS, 10 - SYNTHESIS AND CHARACTERIZATION OF ALPHA,OMEGA-DIHYDROXYOLIGO(ALKYLENE MALEATE)S
B. Dunjic et al., SYNTHESIS AND RHEOLOGICAL STUDY OF SOME MALEIC-ACID AND FUMARIC-ACID STEREOREGULAR POLYESTERS, 10 - SYNTHESIS AND CHARACTERIZATION OF ALPHA,OMEGA-DIHYDROXYOLIGO(ALKYLENE MALEATE)S, Macromolecular chemistry and physics, 199(6), 1998, pp. 1051-1055
alpha,omega-Dihydroxyoligo(alkylene maleate)s with molecular weights r
anging from 1500 to 4000 were prepared by polycondensation, in 1-methy
l-2-pyrrolidone at 105 degrees C, of potassium maleate and 1,4-dibromo
butane, 1,6-dibromohexane or 1,8-dibromooctane in the presence of 2-br
omoethanol. The structure of oligomers was checked by H-1 and C-13 NMR
spectroscopy. In most cases the mean functionality of oligomers is re
asonably close to two.