Bibliographic Details
| Title: |
Preparation and optical characterization of poly (vinyl alcohol) and starch (native and modified) blend films. |
| Authors: |
Masood, Summyia1 (AUTHOR) smasood@uok.edu.pk, Gulnar, Lubna1 (AUTHOR) lubnagulnar@gmail.com, Chandio, Ali Dad2 (AUTHOR), Arshad, Hira3 (AUTHOR), Rehman, Warda1 (AUTHOR), Atique, Ayesha1 (AUTHOR) |
| Superior Title: |
Journal of Polymer Research. Dec2022, Vol. 29 Issue 12, p1-17. 17p. |
| Subject Terms: |
*POLYVINYL alcohol, *RICE starch, *STARCH, *OPTICAL constants, *BAND gaps, *OPTICAL conductivity |
| Abstract: |
Polymeric films of Poly(vinyl alcohol) (PVA) to produce a lower band gap by blending it with native basmati rice starch (BRS) and Octenyl Succinic Anhydride (OSA) modified basmati rice starch (MBRS) were generated in the current study. The recorded UV–visible spectra in the wavelength range 190–1100 nm specified a redshift in the UV region from 190 to 220 nm, which attributed to the π → π* transitions. The UV–visible absorbance data was utilized to evaluate the optical constants such as band gap, extinction coefficient, refractive index, carbon atoms in conjugation, Urbach's energy, and optical conductivity. The Eg of PVA significantly decreased from 6.36 to 5.77 eV with BRS and MBRS addition. The shifts and alteration in the OH band intensity in the FTIR spectrum confirmed the hydrogen bonding among the blended films. The XRD analysis specified blending of PVA with BRS or MBRS reduced the crystallinity of the blended films. [ABSTRACT FROM AUTHOR] |
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