Dispersities of Polyesters of Various Diphenols Prepared by Irreversible Polycondensations

作者：Kricheldorf Hans R^*; Weidner Steffen M

来源：Macromolecular Chemistry and Physics, 2016, 217(12): 1361-1369.

DOI：10.1002/macp.201600004

• cyclization
• dispersity
• mass spectra
• poly condensation
• polyesters

Polyesters of bisphenol-A, bisphenol-P, catechol, and sebacic acid are prepared and different synthetic methods are compared. The diphenols are condensed with sebacoyl chloride either in dichloromethane/pyridine or in refluxing chlorobenzene without HCl-acceptor. Furthermore, bisphenol-A acetate is polycondensed with sebacic acid in bulk. All experiments are worked up so that fractionation is avoided. The extent of cyclization is estimated by matrix-assisted laser desorption/ionization mass spectrometry (MALDI MS) and the molar mass distribution by size exclusion chromatography (SEC). Polycondensations in solution yield larger fractions of cyclics and higher dispersities (up to 11). Polycondensations in bulk give lower fractions of cycles and dispersities from 4.6 to 6.3 for high molar mass polyesters or 2.8 to 3.5 for low molar mass products. Characteristic curves describing the dependence of the dispersity on the initial monomer concentration are elaborated.

• 出版日期2016-6