4-乙烯基吡啶型两性离子共聚物树脂的制备及其性能

Preparation and Properties of 4-Vinylpyridine Zwitterionic Copolymer Resin

将4-乙烯基吡啶(4-VP)、丙烯酸乙酯(EA)和丙烯酸丁酯(BA)进行自由基三元共聚,得到聚(4-乙烯基吡啶-丙烯酸乙酯-丙烯酸丁酯)三元共聚物(P(4-VP-co-EA-co-BA));随后用1,3-丙磺酸内酯(1,3-PS)对其进行季铵化改性,得到了两性离子共聚物P(4-VPPS-co-EA-co-BA)。利用核磁共振氢谱(1 H-NMR)、傅里叶转换红外光谱(FT-IR)、热重(TG)分析、万能材料试验、稀释涂布平板法和显微镜等对P(4-VP-co-EA-co-BA)和P(4-VPPS-co-EA-co-BA)的化学结构、热力学性能、杀菌性能和抗黏附性能进行了表征。结果表明:P(4-VPPS-co-EA-co-BA)不仅具有较好的热稳定性、拉伸强度和韧性,还具有优秀的抗菌与抗黏附性能。

Zwitterionic polymers have been extensively studied in recent years due to their excellent antifouling properties.By radical copolymer with 4-vinylpyridine(4-VP),ethyl acrylate(EA)and butyl acrylate(BA),the zwitterionic copolymers(P(4-VP-co-EA-co-BA))with different copolymerization ratios were prepared.Then,P(4-VP-co-EA-co-BA)was modified by 1,3-propanesultone(1,3-PS)to obtain functional zwitterionic copolymer resin P(4-VPPS-co-EA-co-BA),which had excellent antibacterial and antifouling property.In order to improve the stability in the water and the mechanical properties,P(4-VPPS-co-EA-co-BA)was cross-linked by different amounts of dichloroethane.Finally,P(4-VP-co-EA-co-BA)and P(4-VPPS-co-EA-co-BA)were characterized by H-nuclear magnetic resonance(1H-NMR)and Fourier transform infrared spectroscopy(FT-IR).Thermal properties,mechanical properties,antibacterial properties and antifouling properties of P(4-VPPS-co-EA-co-BA)were examined by thermal-gravimetric analysis(TG),universal material testing machine,the serial dilution and spread plate technique and microscope,respectively.Results indicated that P(4-VP-co-EA-co-BA)and P(4-VPPS-co-EA-co-BA)were successfully prepared.When the mole fraction of 4-VPPS unit in P(4-VPPS-co-EA-co-BA)(f 4-VPPS)was changed from 14.4%to 28.9%,the tensile strength was improved from 6.51 MPa to 8.93 MPa,while the elongation at break was reduced from 219.00%to 147.60%.When f 4-VPPS was 24.2%,the mechanical properties of P(4-VPPS-co-EA-co-BA)became balanced with tensile strength and elongation at break reaching 7.02 MPa and 195.26%,respectively,meanwhile the thermal decomposition temperature was 299℃.What’s more,the tensile strength of P(4-VPPS-co-EA-co-BA)was greatly improved by cross-linking reaction with dichloroethane.When cross-linking degree was 6%,tensile strength and elongation at break reached 9.97 MPa and 152.21%,respectively.And the water absorption of P(4-VPPS-co-EA-co-BA)was reduced by cross-linking reaction with dichloroethane.When f 4-VPPS reached 19.2%,antibacterial and antifouling abilities of P(4-VPPS-co-EA-co-BA)were excellent to Escherichia coli and Staphylococcus aureus.