Biobased aliphatic polyesters from a spirocyclic dicarboxylate monomer derived from levulinic acid
作者:Nitin G. Valsange、Maria Nelly Garcia Gonzalez、Niklas Warlin、Smita V. Mankar、Nicola Rehnberg、Stefan Lundmark、Baozhong Zhang、Patric Jannasch
DOI:10.1039/d1gc00724f
日期:——
Levulinic acid derived from lignocellulose is an important biobased building block. Here, we report on the synthesis and polymerization of a rigid spirocyclic diester monomer to produce polyesters and copolyesters. The monomer was prepared via a one-step acid catalyzed ketalization involving ethyl levulinate and pentaerythritol by employing a straightforward, solvent-free, and readily scalable method
源自木质纤维素的乙酰丙酸是一种重要的生物基构建块。在这里,我们报告了刚性螺环二酯单体的合成和聚合,以生产聚酯和共聚酯。该单体是通过一步酸催化的缩酮化反应制备的,其中涉及乙酰丙酸乙酯和季戊四醇,采用一种无需色谱纯化的简单、无溶剂且易于扩展的方法。尽管如此,在缩聚之前小心地从螺二酯中去除痕量水被证明对于避免副反应至关重要。关于温室气体 (GHG) 排放的初步生命周期评估 (LCA) 表明,相应的螺二酸往往对环境有利,产生的 CO 2排放少于例如、生物基琥珀酸和己二酸。随后分别在螺二酯与 1,4-丁二醇、1,6-己二醇、新戊二醇和 1,4-环己烷二甲醇的熔融缩聚和改性熔融缩聚中制备了一系列具有合理高分子量的脂肪族聚酯。所得完全无定形聚酯的玻璃化转变温度范围为 12–49 °C,热稳定性高达 300 °C。基于新戊二醇和 1,4-环己烷二甲醇的聚酯的热压薄膜透明且机械强度高,动态熔体流变学显示出随