title: Optical and positron annihilation spectroscopic studies on PMMA polymer doped by rhodamine B/chloranilic acid charge transfer complex: Special relevance to the effect of γ-ray irradiation.
abstract: Polymeric sheets of poly (methylmethaclyerate) (PMMA) containing charge transfer (CT) complex of rhodamine B/chloranilic acid (Rho B/CHA) were synthesized in methanol solvent at room temperature. The systematic analysis done on the Rho B and its CT complex in the form of powder or polymeric sheets confirmed their structure and thermal stability. The IR spectra interpreted the charge transfer mode of interaction between the CHA central positions and the terminal carboxylic group. The polymer sheets were irradiated with 70 kGy of γ radiation using (60)Co source to study the enhanced changes in the structure and optical parameters. The microstructure changes of the PMMA sheets caused by γ-ray irradiation were analyzed using positron annihilation lifetime (PAL) and positron annihilation Doppler broadening (PADB) techniques. The positron life time components (τ(i)) and their corresponding intensities (I(i)) as well as PADB line-shape parameters (S and W) were found to be highly sensitive to the enhanced disorder occurred in the organic chains of the polymeric sheets due to γ-irradiation.
authors: Cyclotron Facility, Nuclear Research Center, Atomic Energy Authority, Cairo 13759, Egypt. Electronic address: hebrahim_hassan@yahoo.com.
authors: H E
authors: HE
authors: Hassan
authors: Chemistry Department, Faculty of Science, Taif University, P.O. Box 888, Al-Hawiah, Taif 21974, Saudi Arabia; Chemistry Department, Faculty of Science, Port Said University, Port Said, Egypt.
authors: Moamen S
authors: MS
authors: Refat
authors: Physics Department, Faculty of Science, Kafrelsheikh University, Kafr El-Sheikh, Egypt; Physics Department, Faculty of Science, Taif University, P.O. Box 888, Al-Hawiah, Taif 21974, Saudi Arabia.
authors: T
authors: T
authors: Sharshar
keywords: Chloranilic acid; PMMA; Positron annihilation spectroscopy; Rhodamine B; γ-Ray irradiation