Poly(ionic liquid)s (P(IL)s) of different degrees of polymerization (10, 50, and 100) were prepared via RAFT polymerization using an alkyne-terminated xanthate as transfer agent, with a monomer conversion of up to ∼80% and a ĐM of 1.5 for P(IL)100. Subsequently, P(IL) chains were coupled to 15N-labeled azido-functionalized hydroxyethyl cellulose (HEC), forming graft copolymers of HEC with different chain length and graft densities, which were characterized using (13C and 15N) CP-MAS NMR and FT-IR spectroscopies. The antibacterial activities of HEC-g-P(IL)s were tested against Escherichia coli and Staphylococcus aureus and were comparable to ampicillin, a well-known antibiotic, demonstrating efficient activity of the graft copolymers against bacteria. Moreover, HEC-g-P(IL)s were slightly more effective against E. coli than S. aureus. A decrease in graft density of P(IL)10 on the HEC backbone decreased the activity of the graft copolymers against both bacteria. These findings suggest that HEC-g-P(IL) could find applications as an antiseptic compound, for example, in paint formulation.
通过RAFT聚合,使用末端炔基黄原酸酯作为转移剂,制备了不同聚合度(10、50和100)的聚
离子液体(P(IL)s),单体转化率高达约80%,P(IL)100的ĐM为1.5。随后,将P(IL)链与15N标记的
叠氮功能化
羟乙基纤维素(
HEC)偶联,形成具有不同链长和接枝密度的
HEC接枝共聚物,通过(13C和15N)CP-MAS NMR和FT-IR光谱进行表征。
HEC-g-P(IL)s对大肠杆菌和
金黄色葡萄球菌的抗菌活性测试表明,其抗菌活性与已知的抗生素
氨苄西林相当,显示了接枝共聚物对细菌的高效活性。此外,
HEC-g-P(IL)s对大肠杆菌的抗菌效果略优于
金黄色葡萄球菌。随着P(IL)10在
HEC骨架上的接枝密度降低,接枝共聚物对两种细菌的活性均有所下降。这些发现表明,
HEC-g-P(IL)有可能作为消毒剂化合物得到应用,例如在涂料配方中。