基于反应挤出的聚丁二酸丁二醇酯扩链改性研究OA

In this study,low-molecular-weight poly(butylene succinate)(PBS)was chain-extended through reactive ex-trusion using benzoyl peroxide(BPO)as a radical initiator in a twin-screw extruder.The influence of BPO content on the viscosity-average molecular weight,melt flow rate,crystallization behavior,mechanical properties,and rheological characteristics of the modified PBS was systematically investigated.Results showed that the addition of a small amount of BPO significantly increased the viscosity-average molecular weight from 103 878 g/mol to 147 475 g/mol,while the melt mass flow rate decreased from 21.1 to 4.5 g/10 min.Moreover,the melt crystallization temperature rose markedly from 63.1 to 94.3℃.In terms of mechanical performance,the modified PBS exhibited substantial improvements:ten-sile strength,flexural strength,impact strength,and flexural modulus increased by 13.2%,53.9%,40.5%,and 40.0%,respectively.Concurrently,its melt rheological behavior was notably enhanced,indicating improved melt strength and processability.This work not only presents an effective and scalable strategy for PBS chain extension but al-so offers valuable insights for optimizing the processing and expanding the application potential of bio-based PBS materi-als.