Comparison Of Plasticizing Proformance Of Different Plasticizers On PVC And Preparation Of Migration-resistant Antibacterial Pvc Materials

Phthalate plasticizers are account for 80%of the total quantity of plasticizers used in PVC materials.However,their migration and toxicity are potential risks to the environment as well as human health.Phthalate plasticizers have been strictly regulated by governments all over the world,particularly in the use of certain phthalates in consumer products to which children and patients are exposed.Functional plasticizers,such as green,efficient and migration resistance will play an important role in the future of the plasticizer market.In this thesis,a systematic comparative study on the plasticizing performance of PVC between 5 green plasticizers and dioctyl phthalate(DOP)was conducted in detail which offered the guideline of PVC plasticizer in medical field.Based on the bio-based polyester PEPBSS,an antibacterial bio-based polyester QPEPBSS was synthesized,with the aim of developing an industrially viable nonmigratory antibacterial PVC.These works could serve as a reference for the selection of plasticizers in the field of medical PVC,as well as the creation of novel bio-based polyester plasticizers that are multifunctional and ecologically friendly.The main contents are as follows:(1)The plasticizing effect of DINCH,DEHCH,PPA,TOTM,ATBC and DOP on PVC was studied systematically.The plasticizing performances of five environmental plasticizers were as excellent as that of DOP,but each had its own significant characteristics.The long-lasting performance of PPA and the thermal stability of PVC/PPA were optimal.After 48 hours of extraction in deionized water,ethanol,and petroleum ether,the migration rates of PVC/PPA samples were 0.18%,0.79%,and 0.36%,respectively.And the evaporation rate was only 0.056%after 6 h volatilization in the oven at 100℃.However,the solvation strength of PPA was weakest,resulting in the highest melt viscosity of PVC/PPA.ATBC had the strongest solvation strength,and its plasticized PVC had the highest impact strength and elongation at break(28.5 k J/m~2 and284%,respectively).(2)Through the use of small molecule plasticizers,the plasticizing characteristics of the bio-based polyester PEPBSS were examined.The material’s migration resistance and thermal stability steadily improved as the amount of PEPBSS added increased.When the PEPBSS concentration was raised to more than 25 phr,the migration rate of samples in three distinct polar solvents was lowered to less than 1%.Although PEPBSS was compatible with PVC,its plasticizing effect was inferior than DEHCH.(3)The antibacterial plasticizer QPEPBSS was prepared,and the plasticizing and antibacterial characteristics of its plasticized PVC samples were systematically investigated.The mechanical properties and toughness of the materials worsen as the amount of QPEPBSS increased,as do the thermal stability and migration resistance,however the antibacterial performance gradually improved.After quaternary ammonium modification,QPEPBSS had a much lower plasticizing impact than PEPBSS.The tensile strength of PVC was 27.8 MPa and the elongation at break was 253%when the mass ratio of PVC/DEHCH/PEPBSS/QPEPBSS/ESO/stabilizer was 100/10/10/30/3/2.The migration rate of sample after 48 h extraction in deionized water,ethanol and petroleum ether was 0.31%,1.78%,and 0.44%respectively,and the evaporation rate was 0.183%after 6 h volatilization in the oven at 100℃.It had an excellent antibacterial rate for both Gram-positive and Gram-negative bacteria,as well as great biocompatibility,making it a versatile antibacterial medical device substrate material with excellent performance.