Secondary chain motion and mechanical properties of γ‐irradiated‐regenerated cellulose films

Abstract

Regenerated cellulose films prepared using NaOH/urea solvent system were exposed to different doses of g-radiation, ranging from 5 to 50 kGy to modify their properties. Change in relative crystallinity as a function of absorbed dose was studied using XRD. The tensile and dynamic mechanical properties were tested and it was found that exposure to 10 kGy imparted maximum improvement in these properties, that is 10% improvement in tensile strength, 43% increase in Young's modulus, and 22% increase in storage modulus. Broadband dielectric spectroscopy technique was used to investigate effect of absorbed dose on the secondary chain motions of the regenerated cellulose and the results were in line with findings of the tensile and dynamic mechanical tests.

Improving the nutritive value of mulberry leaves, Morus spp. (Rosales: Moraceae) for silkworm larvae, Bombyx mori (Lepidoptera: Bombycidae) using gamma irradiation

“…The degree of crystallinity in the cellulose molecular structure is the main factor affecting the rate of enzyme hydrolysis, which indicates the absorption capacity of the enzyme for the substrate; the initial enzymatic rate continues to increase with a decreasing crystallinity index (Hall et al, 2010). In the current study, the percentage of crystallinity decreased with increasing the amorphous region in irradiated mulberry leaves, which is similar to the report of Tanvir et al (2017). This indicates increased destruction of the crystalline region to an amorphous structure following gamma irradiation.…”

Comparison of Regenerated Cellulose Membrane Coagulated in Sulphate Based Coagulant

“…The peak at 1641 cm -1 representing C-O carbonyl stretching vibrations, O-H bending vibration at 1313 and 1366 cm -1 and a sharp peak at 894 cm -1 representing the C-O-C bridge stretching of β-glycosidic linkage between glucose in cellulose chain (Tanvir et al, 2017). Higher intensity at 894 cm -1 indicating higher amorphous region in the regenerated cellulose membrane (cellulose II) than in cotton (cellulose I) (Liu et al 2010) These absorption band were only presented in regenerated cellulose membrane (Tanvir et al, 2017). Peak 3331 cm -1 has shifted to the right suggesting that the regenerated membrane has stronger inter-and intra-molecular hydrogen bond.…”

“…During the cellulose dissolution process, cellulose started to swell and formed ballooning structure. Then, the inclusion complex formed around the cellulose chain and enable the cellulose bundle to separate from one and another to form single cellulose chain (Tanvir et al, 2017;Bjőrn et al 2017).…”

Preparation and Characterization of Regenerated Cellulose Film from a Solution in Lithium Bromide Molten Salt Hydrate

“…It is worth mentioning that the films prepared in LiBr molten salt hydrate with appropriate dissolving time had high toughness because of the high ultimate tensile strength and failure strain [41]. Usually, the elongation at break of the cellulose films regenerated in ionic liquid [40], NaOH/urea [42] or DMAc/LiCl [17] was lower than 15%. The films prepared in the present study had the maximum elongation at break as high as 26%.…”