Title: Enhancement of Mechanical Properties of Microcrystalline Cellulose Reinforced Polyvinyl Alcohol Biocomposites with Minimal Addition of Multiwall Carbon Nanotube
Authors: Mousumi Bose, Abdul R. Siddiqui
Abstract: Polyvinyl alcohol (PVA) is a well-known biodegradable polymer, which has potential applications in wound dressing and other biomedical fields. Its degradation rate can be augmented by blending with more biodegradable natural materials, such as, microcrystalline cellulose (MCC). Addition of minimum amount of multiwall carbon nanotubes (CNT) can further enhance the mechanical properties of the composite. To study the synergistic effect of CNT and MCC on the mechanical behavior of PVA composites, MCC loading was varied from 5 to 20 vol% keeping CNT content fixed at 1 vol% for all the gel-cast composites. Young’s modulus and tensile strength were enhanced by 1 vol% of CNT up to 39 % and 35 % respectively, which were further decreased with increment of MCC loading. Among all the PVA-CNT-MCC composites 5 vol% MCC and 1 vol% CNT loaded composite showed the best mechanical properties. The samples were further analyzed by x-ray diffraction (XRD), Fourier transform spectroscopy (FTIR), and scanning electron microscopy (SEM). Phase analysis revealed that dominant nature of PVA matrix was prevalent in all composites. SEM images confirmed the agglomeration of MCC in high MCC loaded composites. Higher MCC loading worsened interfacial interaction, resulting in phase separation, which explains the decreasing trend of mechanical properties. This study was also validated with different micromechanical models and among them Halpin-Tsai model matched with the observations very closely.
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Conference: CAMX 2022
Publication Date: 2022/10/17
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