Fig. 3From: Enzymatic synthesis of a novel solid–liquid phase change energy storage material based on levulinic acid and 1,4-butanediolOptimization of reaction conditions for the enzyme-catalyzed synthesis of PCM. A under certain conditions, LBE content changes with reaction time; B the change of LBE content with reaction time at different temperatures; C the change of LBE content with reaction time at different ratios of enzyme addition; D the relative percentages of LBE content in the product at different acid–alcohol ratiosBack to article page