| Abstrakt: |
Room-temperature polycondensations of methylsuccinic acid (MSA) (at 35°C), bromosuccinic acid (BSA), 2-bromoadipic acid (BAA) (at 40°C), and citraconic acid (CA) (at 60°C) with diols containing 1,3-propanediol (1,3-PD) and 1,4-butanediol (1,4-BD) were performed under reduced pressure (0.3-30 mmHg) using scandium trifluoromethanesulfonate [Sc(OTf)3], scandium trifluoromethanesulfonimide [Sc(NTf2)3], and polymer-supported scandium trifluoromethanesulfonate (PS-Sc) to give poly(alkylene alkanoate)s with Mn = 0.67 x 104 - 1.41 x 104 (Mw/Mn = 1.4-2.1) with quantitative yields. The catalysts are recovered quantitatively and reused. Room-temperature polycondensation made it possible to use thermally unstable monomers containing carbon-carbon double bond and bromo functionality. The atom-transfer radical polymerization (ATRP) of methyl methacrylate (MMA) ([M]0/[I]0 = 10) using poly(butylene succinate-co-butylene bromoadipate) [poly(BS-co-BBA)] (Mn = 0.75 x 104, Mw/Mn = 2.0) as the macroinitiator and complex of CuBr and 1,1,4,7,10,10-hexamethyltriethylenetetramine (HMTETA) as the catalyst was carried out in anisole at 80°C for 10h under nitrogen atmosphere to give polyester having PMMA side chains [Mn = 2.01 x 104 and Mw/Mn = 1.9, 65% yield]. [ABSTRACT FROM AUTHOR] |
