Mechanical, optical, and electrical properties of cellulosic semiconductor nanocomposites

Abstract

Photoluminescent cellulose fibers were prepared by impregnation of bleached bagasse pulp with the different cadmium and zinc sulfides nanostructures, namely, CdS, ZnS, CdS/ZnS, ZnS/CdS (Core/shell nanostructures), CdS/ZnS/CdS and ZnS/CdS/ZnS multilayered nanostructures. The prepared cellulosic nanocomposites were characterized regarding strength properties (tensile strength, tensile energy absorption, and burst resistance), optical properties (fluorescence emission), thermal stability, and dielectric properties. The strength properties of paper sheets nanocomposites impregnated with different nanoparticles solutions were noticeably decreased in spite of the very low loading of the fibers with the semiconductor nanoparticles. The decrease in tensile index, tensile energy absorption, and burst index of paper sheets nanocomposites are found to be ranged from 12-27, 13-36, and 11-38 %, respectively. The different paper sheets nanocomposites showed fluorescence emission different from the as prepared polyethyleneimine-stabilized nanoparticles. Thermogravimetric analysis results showed that: the semiconductor nanoparticles did not affect the onset degradation temperature of cellulosic fibers but it caused faster termination of the main degradation step. The dielectric loss and the dc-conductivity of cellulosic fibers increased as a result of impregnating the fibers. The nature of the nanoparticles and the properties of the interphases strongly influenced the dielectric properties of the cellulosic/semiconductors nanocomposites.

Processing, Dynamic mechanical thermal analysis, and dielectric properties of barium titanate/cellulosic polymer nanocomposites

“…for pure EC and the 11.5 vol% BT‐loaded samples, where three absorption regions are shown (two in the intermediate frequency range and the third in the higher frequency one). The absorption in the higher frequency region (process I) may be due to the side groups attached to the polymer chains (β‐process) . The β*‐process (process II) is attributed to cooperative motion of side group rotation and the main chain .…”

Physical, dielectric and biodegradation studies of PVC/silica nanocomposites based on traditional and environmentally friendly plasticizers

“…At comparatively low content, nanoparticles offer improved mechanical, electrical, and thermal properties of composites. In general, one of the significant properties of composites is their dielectric property which has been studied extensively [1][2][3][4][5][6][7][8][9]. The dielectric properties of composites play an important role in areas such as microelectronic, optoelectronic and packaging materials [10][11][12].…”

Electrical properties of FeII-terpyridine-Modified cellulose nanocrystals and polycaprolactone/FeII-CTP nanocomposites

“…The first relaxation mechanism may be explained on the basis of interfacial polarization due to the build‐up of charges on boundaries and interfaces between materials with very different electrical properties . While, the second process in the high frequency side process reflects the polarization of various sized dipoles of the main chain .…”