Abstract
Poly(butylene succinate)(PBS)exhibits many advantages,such as renewability,biodegradability,and impressive thermal and mechan-ical properties,but is limited by the low melt viscosity and strength resulted from the linear structure.To address this,vitrimeric network was in-troduced to synthesize PBS vitrimers(PBSVs)based on dynamic imine bonds through melt polymerization of hydroxyl-terminated PBS with vanillin derived imine containing compound and hexamethylene diisocyanate using trimethylolpropane as a crosslinking monomer.PBSVs with different crosslinking degrees were synthesized through changing the content of the crosslinking monomer.The effect of crosslinking degree on the thermal,theological,mechanical properties,and stress relaxation behavior of the PBSVs was studied in detail.The results demonstrated that the melt viscosity,melt strength,and heat resistance were enhanced substantially without obvious depression in crystallizability,thermal stabili-ty,and mechanical properties through increasing crosslinking degree.In addition,the PBSVs exhibit thermal reprocessability with mechanical properties recovered by more than 90％even after processing for three times.Furthermore,PBSV with improved melt properties shows signifi-cantly improved foamability compared to commercial PBS.This research contributes to the advancement of polymer technology by successfully developing PBS vitrimers with improved properties,showcasing their potential applications in sustainable and biodegradable materials.
基金项目
National Natural Science Foundation of China(51973176)
Chongqing Talent Plan for Young Top-Notch Talents(CQYC2021059217)
Fundamental Research Funds for the Central Universities(SWUXDJH202314)
维普
万方数据