CdS impregnated cellulose nanocrystals/PVDF composite flexible and freestanding films: Impedance spectroscopic studies

Abstract

Nanocrystalline CdS impregnated cellulose nanocrystals (CdS‐Cellulose) were embedded in polyvinylidene fluoride (PVDF) matrix and free‐standing flexible films of CdS‐cellulose/PVDF nanocomposite were made by sol‐gel technique. Effect of CdS loadings in cellulose embedded in the host matrix (PVDF) on the impedance properties was studied critically for the above samples. Dielectric constants were studied as a function of frequencies (1–100 kHz) at room temperatures. The dielectric constant increased significantly in CdS‐cellulose/PVDF nanocomposite than that for pristine PVDF film. The higher values of dielectric constant as well as dielectric loss were obtained at lower frequencies. This may be caused due to contributions arising out of space charge, dipole, and electronic polarizations. At higher frequencies, only dipole and electronic polarization were seen to contribute significantly. The nature of the Cole‐Cole plots could be seen to deviate significantly from one impedance semicircular arc before diverging after a frequency of 3,158, 2,147, and 1,925 Hz for CdS‐cellulose/PVDF nanocomposite with increased loading of CdS. POLYM. ENG. SCI., 58:1419–1427, 2018. © 2017 Society of Plastics Engineers

Tensile and morphological properties of nanocrystalline cellulose and nanofibrillated cellulose reinforcedPLAbionanocomposites: A review

“…[ 1‐5 ] In order to solve these problems, studies have been focused toward the employment of biodegradable materials in various applications such as packaging, automotive, textile, biomedical and agricultural industries. [ 6‐15 ] There are numerous kinds of biodegradable materials such as polylactic acid (PLA), polybutylene adipate terephthalate (PBAT), polybutylene succinate (PBS), polyhydroxyalkanoates (PHA), and starch etc. [ 1,16‐19 ] Among these biodegradable materials, polylactic acid (PLA) is the most promising one to be used in all applications due to its biodegradability, competitive cost, and comparable properties with conventional petrochemical‐based plastics that is, stiffness, strength and gas permeability.…”

“…[ 68,69 ] Moreover, it has a low thermal expansion coefficient, high aspect ratio, better tensile strength, and good mechanical and optical properties. [ 14,70,71 ] Thus, it has been used in many applications such as paper making, coating additives, food packaging, flexible screens, optically transparent films, lightweight materials for ballistic protection, and automobile windows. Besides, it also has potential in biopharmaceutical applications such as in drug delivery and for fabricating temporary implants.…”

Effect of Impregnated Phenolic Resins on the Cellulose Membrane for Polymeric Insulator

“…This was due to its irregular surface roughness with high peaks (bumpy surface). Consequently, the electrons tend to move by tunnelling [44]. Figure 10b shows the log-log variation in σ ac as a function of frequency.…”

Structural, Mechanical, and Barrier Properties of the Polyvinylidene Fluoride-Bacterial Nanocellulose-Based Hybrid Composite

“…It was found that an increase in cellulose content in polymer matrices noticeably improves the tensile strength of composite membranes [ 17 , 18 ]. Due to its renewable nature and biodegradability [ 19 ], cellulose is often impregnated into the polymer matrix of PVDF to enhance mechanical strength, as reported by studies [ 20 , 21 ]. The purest source of cellulose fibers, in addition to being the most environmentally and economically viable, is bacterial nanocellulose (BNC) [ 22 ].…”