ABSTRACT

A new category of thermally stable and soluble polyketone (PKtph) together with its related zinc oxide-doped nanocomposites (PKtphZnO_a-d) based on 4-tert-butylcyclohexanone moiety as a branched moiety was synthesized through Friedel–Crafts reaction. The desired PKtph characterized through certain characterization techniques including FTIR, viscosity, solubility, XRD, and gel permeation chromatography. Its thermal properties were evaluated by TGA and DTG as well. Furthermore, PKtphZnO_a-d nanocomposites were fabricated with different loading ratios of ZnO nanoparticles (2%, 5%, 10%, and 20%), and the results were confirmed through FT-IR and XRD. TGA results established a significant enhancement in the thermal behavior of polyketone with an increase in the doping of ZnO nanoparticles. The evaluation of morphological properties using TEM and SEM revealed the formation of PKtphZnO_a-d nanocomposites with spherical to sub-spherical ZnO nanoparticles in the size range of 25–30 nm loaded on polymer sheets. The nanocomposites were examined for their antimicrobial activity against bacteria and fungi. Though the tested polyketone did not show any activity against the microbial strains, the addition of ZnO nanoparticles resulted in an increased activity against S. Aureus, P. Aeruginosa, and C. Albicans.

摘要

通过Friedel-Crafts反应合成了一种新型的热稳定和可溶的聚酮（PKtph）及其相关的以4-叔丁基环己酮部分为支链部分的氧化锌掺杂纳米复合材料（PKtphZnO _a-d）。通过某些表征技术（包括FTIR，粘度，溶解度，XRD和凝胶渗透色谱法）表征所需的PKtph。还通过TGA和DTG评估了其热性能。此外，PKtphZnO _a-d以不同的ZnO纳米颗粒负载率（分别为2％，5％，10％和20％）制备了纳米复合材料，并通过FT-IR和XRD证实了该结果。TGA结果表明，随着ZnO纳米颗粒掺杂的增加，聚酮的热行为得到了显着增强。使用TEM和SEM对形态学特性进行评估后，发现形成了PKtphZnO _a-d纳米复合材料，其中球形至亚球形的ZnO纳米颗粒负载在聚合物片材上，粒径范围为25–30 nm。检查纳米复合物对细菌和真菌的抗微生物活性。尽管所测试的聚酮对微生物菌株没有任何活性，但是添加ZnO纳米颗粒会导致对金黄色葡萄球菌，铜绿假单胞菌的活性增加。和C. Albicans。