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Bismuth (III) subsalicylate, a commercial drug, was used as catalyst for 1,4-butanediol-initiated copolymerizations of ε-caprolactone (εCL) and glycolide (GL). Telechelic copolyesters having two OH-endgroups and predominantly alternating sequences were obtained. These copolyesters are amorphous with glass transition temperatures (T g s) below −30°C. In a second series of polymerizations, in...
Germanium, tin, titanium and zirconium tetraalkoxides were polycondensed with poly(ethylene glycol)s (PEGs) and poly(tetrahydrofuran) (PTHF) diols at temperatures between 100 and 200 o C. The lengths of the diols were varied from PEG-300 over PEG-400, PEG-600 and PEG-1000 to PEG-2000. In the case of PTHF diols number average molecular weights (M n s) of 650, 1000 and 2000 were used...
Three monomers were prepared from 4,4-bis(4′-hydroxyphenyl)valeric acid (BHVA) namely its methylester (BHVAM), its bis-acetylated methylester (BAVAM) and its 4,4-bis(4′-acetoxyphenyl)valeric acid (BAVA). All three monomers were polycondensed in bulk at various temperature profiles using Ti(OBu) 4 , Co(OAc) 2 , Mn(OAc) 2 , Sn(OAc) 2 or Bu 2 Sn(OAc) 2 ...
Poly(ether sulfone)s were prepared by polycondensation of silylated 4-tert-butylcatechol and 4,4′-difluorodiphenylsulfone in N-methylpyrrolidone. The feed ratio and the reaction time were varied to study the influence of stoichiometry and conversion on molecular weight and extent of cyclization. Molecular weights and molecular weight distributions (MWD)s were characterized by SEC measurements calibrated...
Various poly(ester imide)s, PEIs, were prepared from N-(4-carboxyphenyl) trimellitimide (4-CPTI) or from N-(3-carboxyphenyl) trimellitimide (3-CPTI). Various catechols or 5-methylresorcinol served as comonomers. MALDI-TOF mass spectrometry revealed that the PEIs derived from 4-CPTI and catechols contain significantly more even than odd cycles, whereas the PEIs derived from 3-CPTI and catechols contained...
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