Synthesis of 蠅-Pentadecalactone Copolymers with Independently Tunable Thermal and Degradation Behavior

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• 作者：James A. Wilson ; Sally A. Hopkins ; Peter M. Wright ; Andrew P. Dove
• 刊名：Macromolecules
• 出版年：2015
• 出版时间：February 24, 2015
• 年：2015
• 卷：48
• 期：4
• 页码：950-958
• 全文大小：404K
• ISSN：1520-5835

文摘

蠅-Pentadecalactone (PDL) was copolymerized with lactones of varying sizes (6-, 7-, 9-, and 13-membered rings) in order to characterize the properties of PDL copolymers throughout the lactone range for copolymerizations catalyzed by magnesium 2,6-di-tert-butyl-4-methylphenoxide (Mg(BHT)₂(THF)₂). Kinetics of the copolymerization reactions were studied using quantitative ¹³C NMR spectroscopy, which revealed that the polymerization of the smaller, strained lactone monomer occurred rapidly before the incorporation of PDL into the polymer. Furthermore, all polymers were randomly sequenced as a consequence of transesterification side reactions that occurred throughout polymerization. The copolymers were all shown to cocrystallize to produce polymers with melting and crystallization temperatures that displayed a linear relationship with respect to monomer ratio. Differences in degradation behavior of the smaller lactones enabled the synthesis of PDL copolymer materials that displayed independently controllable thermal and degradation properties.