Nanocrystallite regions of guar gum filled PU/PAN composites before and after biodegradation using WAXS

Abstract

Polyurethane/polyacrylonitrile semi-interpenetrating polymer network containing varying weight percent of guar gum were prepared. The resulting composites were subjected to biodegradation with the help of specific fungi Aspergillus niger. The composite before and after biodegradation were subjected to wide angle X-ray scattering studies. The nanocrystallite regions, area, and size are determined from X-ray data using three different asymmetric column length functions. A comparison of these parameters does explain the nature of biodegradation at microlevel.

Phase Behaviors of PU/SPI Green Composites Using SAXS Profiles

“…a–e, respectively. From these figures, it is clear that with the increase in the SPI content in the PU matrix, peak intensity and shape increase . The best fit between experimental results and simulated profiles was obtained with an exponential size distribution function for the PU/SPI composites, and for the sake of clarity the experimental and simulated profiles are shown in Figs.…”

Structure–Property Relationship of Biobased Polyurethanes Obtained from Mixture of Naturally Occurring Vegetable Oils

“…An in-house FORTRAN program has been developed and used for the computation of these parameters and are reported in our earlier papers. [26][27][28]…”

“…From X-ray diffractograms, one broad and intense peak that was noticed at 2θ range 20.38 • -21.06 • , is due to the peak that originated from the partially ordered structure formed by the hard segment domain where interchain attractions, such as hydrogen bonding and dipole-dipole interaction, drew the hard and soft segments together. 26,27,38 The shape and size of peaks in X-ray profiles depend on the nature and composition of polyols used, that is, the vegetable oils used had more than one functional group (hydroxyl and ester groups). Figures 4(A)-4(C) indicate that there is a variation of the peak height due to two main factors, such as variation in crystal size (<N>) and strain g (%) in polymers.…”

“…26,27 With an objective to use vegetable oils in the preparation of PUs, the present study focused on the effect of CCO and CO combinations on the performance of PUs. 26,27 With an objective to use vegetable oils in the preparation of PUs, the present study focused on the effect of CCO and CO combinations on the performance of PUs.…”

“…In our earlier communications, we have reported the wide angle X-ray scattering (WAXS) studies on biobased PUs and their interpenetrating polymer networks. 26,27 With an objective to use vegetable oils in the preparation of PUs, the present study focused on the effect of CCO and CO combinations on the performance of PUs. With the best of our knowledge, there is no data available on the utilization of CCO along with CO in the preparation of PUs.…”