化学键合法制备长效抗菌聚对苯二甲酸乙二醇酯材料及其性能

Preparation and Characterization of Long-acting Antimicrobial Polyethylene Terephthalate via Covalent Bonding Method

通过化学反应将抗菌剂聚六亚甲基盐酸胍(PHMG)键合到聚对苯二甲酸乙二醇酯(PET)基体上,制得抗菌剂质量分数为15%的PET抗菌母料(PET-g-PHMG),PHMG与PET的键合效率达93.7%.透射电子显微镜(TEM)结果表明,化学键的键合作用提高了PHMG与PET的相容性,使得极性的PHMG以纳米尺寸均匀分布在PET-g-PHMG中.在PET基体中添加少量PET-g-PHMG,可制成不同抗菌剂含量的PET样品,抗菌母料PET-g-PHMG的添加可抑制PET基体的降解,提高抗菌PET样品的特性黏度.所得抗菌PET样品对大肠杆菌和金黄色葡萄球菌的抑菌率均在99%以上,即使反复水洗,抗菌性能也无明显降低.该抗菌PET样品具有良好的可纺性,通过熔融纺丝可以制成抗菌PET纤维,其抗菌性能具有耐水洗性,抗菌动力学测试结果表明,该抗菌PET样品对革兰氏阴性和阳性细菌还具有较快速的杀灭作用.

Polyhexamethylene guanidine hydrochloride（ PHMG） was uesd to produce a long-acting antimicro-bial polyethylene terephthalate（ PET） masterbatch（ PET-g-PHMG） , which was obtained by covalently bonding 15% PHMG based on total weight onto PET matrix. Attributed to the higher grafting efficiency（93. 7%）, the hydrophilic PHGH is uniformly dispersed in PET matrix without any aggregate, which potentially enhances its antimicrobial activity. Several antimicrobial PET samples can be prepared by adding specific amount of PET-g-PHMG into the PET matrix. It was found that the addition of PET-g-PHMG did not cause the degradation of PET matrix, instead, increased the intrinsic viscosity because of the presence of some un-reactive functional groups in the PET-g-PHMG. The antimicrobial PET samples showed quickly and efficiently antimicrobial activity against both Gram-positive and Gram-negative bacteria. Furthermore, the antimicrobial activity of the antimicrobial PET fibers prepared by a spun-bonded method remained even after constant water washing for 10 d, indicating its long-acting antimicrobial ability via a contact activity rather than a release mechanism.