Objective:To explore the crystallization promotion effect of a representative bio-based polymer,poly(lactic acid),on its stereo isomeric polymer material,and to clarify the structure-activity relationship of nucleating agents in this process.Methods:Different molecular weights of poly(D-lactic acid)(PDLA)were prepared,and the effects of the addition amount,crystallization temperature,and mixing method on the crystallization properties,heat resistance,and mechanical properties of the final material were investigated.Finally,the crystallization promotion effect of PDLA and several commonly used commercial nucleating agents on poly lactic acid was compared to explore the mechanism of the experimental results in this process and to verify the feasibility of PDLA as a nucleating agent for poly lactic acid materials.Results:A variety of molecular weight PDLA bio-based polymer materials were successfully prepared,and the relationship between PDLA molecular weight and its crystallization promotion effect was clarified.The influence of PDLA addition on the crystallization properties of poly lactic acid materials was also clarified.It was verified that different mixing methods and crystallization conditions had no effect on the crystallization promotion effect of PDLA,and it was proved that the crystallization nucleation effect of optimized PDLA was superior to that of commercially available nucleating agents.Conclusion:As a stereoisomer of poly lactic acid,PDLA can be used as a nucleating agent in poly lactic acid material systems,with the advantages of high nucleation efficiency,bio-based,good compatibility,low cost,and degradability.
维普
万方数据
