High molecular weight methyl ester of microbial poly(β,l-malic acid): Synthesis and crystallization
作者： Carlos E. Fernández , Manuel Mancera , Eggehard Holler , Juan A. Galbis , Sebastián Muñoz-Guerra
DOI: 10.1016/J.POLYMER.2006.07.063
关键词: Crystal 、 Acetone 、 Crystallization 、 Kinetics 、 Polyester 、 Crystal structure 、 Diazomethane 、 Polymer chemistry 、 Malic acid 、 Chemistry 、 Nuclear chemistry
摘要: Abstract High molecular weight poly(α-methyl β, l -malate) ( M n ∼ 25,000, PD ∼ 1.7) was prepared from microbial poly(β, -malic acid) ∼ 29,000, PD ∼ 1.3) by methylation with diazomethane in dry acetone without substantial cleavage of the polyester main chain. The thermal properties this poly(malate) were assessed and its crystal structure preliminary examined. Two forms identified X-ray diffraction, their occurrence being dependent on crystallization conditions. kinetics nonisothermal isothermal crystallizations melt studied modelled using Avrami approach. Results compared to those recently reported us for low ∼ 3000, PD ∼ 1.3).
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