Application of the Shrinking Particle Model for the Evaluation of Molecular Recyclability of PET versus Semi-Aromatic Polyesters  

作　　者：Jack van Schijndel Sanne de Krom Dennis Molendijk Koen van Beurden Amarante Böttger Jack van Schijndel;Sanne de Krom;Dennis Molendijk;Koen van Beurden;Amarante Böttger(Research Group Biopolymers/Green Chemistry, Centre of Expertise Safe & Resilient Society, Avans University of Applied Science, Breda, Netherlands;New Materials and Their Applications, Centre of Expertise Safe & Resilient Society, Avans University of Applied Science, Breda, Netherlands;Department of Materials Science and Engineering, Delft University of Technology, Delft, Netherlands)

机构地区：[1]Research Group Biopolymers/Green Chemistry, Centre of Expertise Safe & Resilient Society, Avans University of Applied Science, Breda, Netherlands [2]New Materials and Their Applications, Centre of Expertise Safe & Resilient Society, Avans University of Applied Science, Breda, Netherlands [3]Department of Materials Science and Engineering, Delft University of Technology, Delft, Netherlands

出　　处：《Open Journal of Physical Chemistry》2024年第2期21-35,共15页物理化学期刊（英文）

摘　　要：The molecular recyclability of poly (ethylene terephthalate) (PET) and three semi-aromatic polyesters poly (phloretic acid) (poly-H), poly (dihydroferulic acid) (poly-G), and poly (dihydrosinapinic acid) (poly-S) is evaluated in this study. PET is an extensively used aromatic polyester, and poly-H, poly-G, and poly-S can be considered semi-aromatic poly (lactic acid) modifications. All these polyesters have been depolymerized at neutral pH and by acid- and base-catalyzed hydrolysis at two temperatures, i.e., 50˚C and 80˚C. Base-catalyzed depolymerization of virgin PET leads to an isolated yield of 38% after 48 hours of reaction at 80˚C. Contrary to these results for PET, almost all the monomers of the semi-aromatic polyesters poly-H, poly-G, and poly-S are recovered with isolated yields larger than 90% at the same temperature after 15 minutes in a facile manner. A shrinking particle model used to determine the global kinetics of the base-catalyzed depolymerization showed that the rate rises with increasing temperature. Using the shrinking particle model, the intrinsic reaction rate constants were determined. It has been demonstrated that the rate coefficients of the depolymerization of the semi-aromatic polyesters poly-H, poly-G, and poly-S are between 2 and 3 orders of magnitude higher than those for PET.The molecular recyclability of poly (ethylene terephthalate) (PET) and three semi-aromatic polyesters poly (phloretic acid) (poly-H), poly (dihydroferulic acid) (poly-G), and poly (dihydrosinapinic acid) (poly-S) is evaluated in this study. PET is an extensively used aromatic polyester, and poly-H, poly-G, and poly-S can be considered semi-aromatic poly (lactic acid) modifications. All these polyesters have been depolymerized at neutral pH and by acid- and base-catalyzed hydrolysis at two temperatures, i.e., 50˚C and 80˚C. Base-catalyzed depolymerization of virgin PET leads to an isolated yield of 38% after 48 hours of reaction at 80˚C. Contrary to these results for PET, almost all the monomers of the semi-aromatic polyesters poly-H, poly-G, and poly-S are recovered with isolated yields larger than 90% at the same temperature after 15 minutes in a facile manner. A shrinking particle model used to determine the global kinetics of the base-catalyzed depolymerization showed that the rate rises with increasing temperature. Using the shrinking particle model, the intrinsic reaction rate constants were determined. It has been demonstrated that the rate coefficients of the depolymerization of the semi-aromatic polyesters poly-H, poly-G, and poly-S are between 2 and 3 orders of magnitude higher than those for PET.

关 键 词：DEPOLYMERIZATION Molecular Recycling Poly-H Poly-G Poly-S PET Circular Polymers 

分 类 号：O64[理学—物理化学]