Preparation and Properties of Highly Electroconductive and Heat-Resistant CMC/Buckypaper/Epoxy Nanocomposites

Abstract

Self-assembled buckypapers have been successfully prepared using sodium carboxyl methyl cellulose (CMC) as a binder. The lowest resistivity that was reached was 0.43 ± 0.03 Ω·m, when the buckypapers were prepared by the same mass of CMC and carboxy-modified carbon nanotubes (CNTs). A heat-resistant electroconductive nanocomposite with epoxy resin as the matrix and CMC/buckypapers as the reinforcement was fabricated by a resin impregnation molding technique. The effects of CMC/buckypaper layers on the conductivity, thermal stability, and mechanical and dynamic mechanical performance of the epoxy resin polymer nanocomposites were investigated. It was found that CMC/buckypapers hold great promise for improving the properties of nanocomposites, and the buckypapers’ performance can be enhanced by using modified CNTs to prepare them. The obtained nanocomposites showed an approximate 71.23% bending strength improvement (125.04 ± 5.62 MPa) and a 30.71% bending modulus improvement (5.83 ± 0.68 GPa), with an increased number of CMC/buckypaper layers. An enhanced degradation temperature and residual mass were also achieved for the nanocomposites when compared with a pure polymer. The nanocomposites with four CMC/buckypaper layers possessed the highest storage modulus (1934 MPa), which was approximately 60% higher than that of a neat polymer (1185 MPa). Therefore, CMC/buckypapers could be effectively used to manufacture heat-resistant electroconductive polymer nanocomposites with improved properties.

Mathematical Modelling of Acetaminophen Release in HPC/PAAm Hydrogel: Synthesis and Application

“…Also, HPC/PAAm gel peaks moved towards lower temperatures International Journal of Polymer Science when acetaminophen was added. This indicates that the HPC/PAAm gel with incorporated acetaminophen has a lower thermal stability than the pure HPC/PAAm gel, as can be inferred from [37]. From Figure 8 can be observed, besides, that the acetaminophen is stable until some point between 200 and 300°C, and after that, its loss of mass increases rapidly.…”

“…The values of the constant rate k and exponent n obtained for the release of acetaminophen in water and in buffer (PBS) from the HPC/PAAm gel by the Korsmeyer-Peppas model, at the three proposed temperatures (35,37, and 39°C), are presented in Table 1.…”

“…Castillo-Miranda et al reported in [3] a study on the crystallization of (RS)-2-(4-isobutylphenyl)propionic acid, a drug commonly known as ibuprofen, within a HPC/PAAm gel, as well as the kinetics of drug release in it. The drug release tests were performed at three temperatures (35,37, and 39°C) and using two different solvents: a buffer solution of water and phosphate with a pH of 7.38 and a (50 : 50) mixture of ethanol with water with pH 7. The drug release was modelled with the zero-order, first order, Higuchi, and Korsmeyer-Peppas models, represented in Equations (1), (2), (3), and (4), respectively.…”

Novel Unsaturated Polyester Nanocomposites via Hybrid 3D POSS-Modified Graphene Oxide Reinforcement: Electro-Technical Application Perspective

“…The dexterous properties of the thermosetting plastics have empowered researchers to widen their possible application in a vast range of fields [1][2][3][4]. The enticing properties such as low viscosity (uncured state), customized modulus (according to application), high thermal stability, smooth process ability and their ability to use with fillers has provided impetus in expanding their commercial applications [5]. The recent global thermosetting market implies mushrooming demand of unsaturated polyester (UP)-based composites in industrial and commercial applications.…”

Wet-Spinning Assembly of Continuous, Highly Stable Hyaluronic/Multiwalled Carbon Nanotube Hybrid Microfibers

“…Carbon nanotubes (CNTs) are very promising materials for electronic and energy storage devices, sensors, biosensors, composites, and transparent conducting films, etc., due to their high specific surface areas, excellent mechanical properties, and good electrical conductivities [1,2,3]. In recent years, individual CNTs have often been assembled into macro/micro structures, such as CNT fibers, CNT films, and CNT arrays, to improve their application [4,5,6]. Among these CNT products, CNT fibers are microsized materials with suitable electrical conductivities, stable electrochemical properties, significant specific moduli, and specific strengths [7,8].…”