Ternary poly(2-ethyl-2-oxazoline)-polyvinylpyrrolidone-graphene nanocomposites: Thermal, electrical, dielectric, mechanical, and antibacterial profiling

被引:6
作者
Shubha, A. [1 ,6 ]
Manohara, S. R. [1 ]
Siddlingeshwar, B. [2 ]
Daima, Hemant Kumar [3 ]
Singh, Mandeep [4 ]
Revaprasadu, Neerish [5 ]
机构
[1] Visvesvaraya Technol Univ, Siddaganga Inst Technol, Dept Phys, Nanocomposites & Mat Res Lab, Tumakuru 572103, Karnataka, India
[2] Visvesvaraya Technol Univ, MS Ramaiah Inst Technol, Dept Phys, Bengaluru 560054, India
[3] Amity Univ Rajasthan, Amity Inst Biotechnol, Amity Ctr Nanobiotechnol & Nanomed ACNN, Jaipur 303002, Rajasthan, India
[4] RMIT Univ, Sch Sci, Melbourne, Vic 3000, Australia
[5] Univ Zululand, Dept Chem, Private Bag X1001, ZA-3880 Kwa Dlangezwa, South Africa
[6] Achrya Inst Grad Studies, Dept Phys, Bengaluru 560107, Karnataka, India
关键词
Poly(2-ethyl-2-oxazoline); Polyvinylpyrrolidone; Graphene; 2-D materials; Nanocomposites; Thermal stability; Antimicrobial properties; FREQUENCY-DEPENDENT CONDUCTIVITY; GRAPHENE OXIDE; COMPOSITE; FILMS; POLYANILINE; PERFORMANCE; STRENGTH; NANORODS; SENSORS;
D O I
10.1016/j.diamond.2022.109001
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Graphene-based poly(2-ethyl-2-oxazoline) (PEOX) and polyvinylpyrrolidone (PVP) blend-matrix nanocomposites were prepared employing different weight percentages of graphene nanoplatelets as filler by ultrasonication assisted solution casting method. These nanocomposites were explored for their thermal, electrical, dielectric, and mechanical properties, and antimicrobial efficiency. Thermogravimetric analysis demonstrated that gra-phene operates as a barrier to limit thermal diffusion across the PEOX-PVP blend matrix, and hence, improve thermal stability of nanocomposites. The dielectric and electric properties such as dielectric constant, dielectric loss, loss tangent and electrical conductivity of PEOX-PVP-10 wt% graphene nanocomposite were found to in-crease with temperature. The presence of semi-circles in the Cole-Cole plot indicated the existence of a relaxation process in the conduction mechanism of the nanocomposite. AC electrical conductivity, sigma AC, of PEOX-PVP-10 wt % graphene nanocomposite was found to obey Jonscher's power law. The temperature-dependent behavior of frequency exponent, s, of sigma AC discusses the applicability of correlated barrier hopping (CBH) model. The extracted DC conductivity from AC conductivity studies was found to be temperature-dependent and obey Arrhenius relation with activation energy of conduction, Ea, of 0.41 eV and 0.39 eV in the lower and higher temperature regions, respectively. The mechanical properties of nanocomposites were enhanced dramatically when graphene loading was increased, demonstrating that a better interaction exists between graphene and the PEOX-PVP blend matrix. PEOX-PVP-15 wt% graphene nanocomposite showed superior mechanical properties (tensile strength: 9.18 MPa and Young's modulus: 3.19 MPa) among the synthesized nanocomposites. Further, the antibacterial activities of these nanocomposites against Gram-negative (E. coli) and Gram-positive (E. facecalis) bacteria revealed differential action.
引用
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页数:10
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