A comparative study of the structural, optical and morphological properties of different types of Makrofol polycarbonate

Zaki, M. F.; Elkalashy, Sh.I.; Soliman, T.S.

doi:10.1007/s00289-021-04011-2

Polym. Bull.

2022

DOI: 10.1007/s00289-021-04011-2

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A comparative study of the structural, optical and morphological properties of different types of Makrofol polycarbonate

M. F. Zaki

Sh.I. Elkalashy

T.S. Soliman

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Cited by 11 publications

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“…These interactions may form a hydrogen bond that creates localized states within the forbidden energy zone and reduces the distance between the valence and conduction bands. This disorder and defects created were affirmed by investigation of the tail width, Urbach energy (E U ), of the blend films using Equation ( 4) [49]. The linear portion from the relation between ln (α) and (hυ), Figure 6(b), is the reciprocal of E U .…”

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confidence: 79%

Effects of SiO2 Nanoparticles on Polyvinyl Alcohol/Carboxymethyl Cellulose Polymer Blend Films’ Structural, Wettability, Surface Roughness, and Optical Characteristics

Soliman

2024

Advances in Polymer Technology

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The blend matrix composed of polyvinyl alcohol and carboxymethylcellulose (PVA/CMC) was prepared via the casting method. SiO2 nanoparticles were added as reinforcement in different amounts (SiO2 = 1, 2, 3, and 4 wt.%). The study utilized FTIR to examine the alterations in composition and the interplay between the blend matrix and the inclusion of SiO2. Also, for the first time, the surface roughness and surface wettability of the PVA/CMC blend matrix were investigated with the addition of SiO2 using measurements of contact angle and surface roughness parameters. The surface roughness and wettability of the blend matrix increased as the SiO2 content increased. In addition, the blend matrix optical features were determined by the UV–visible spectrophotometer. Based on the analysis using Tauc’s relation, it was found that the energy bandgap decreases from 5.52 to 5.17 eV (direct transition) and from 4.79 to 4.32 eV (indirect transition) for the PVA/CMC and PVA/CMC/4%SiO2 blend films, respectively. The refractive index increases from 2.009 to about 2.144 for the PVA/CMC and PVA/CMC/4%SiO2 blend films, respectively. Furthermore, optical conductivity and dielectric constants were improved for the PVA/CMC blend film after the addition of SiO2 nanoparticles.

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confidence: 79%

Effects of SiO2 Nanoparticles on Polyvinyl Alcohol/Carboxymethyl Cellulose Polymer Blend Films’ Structural, Wettability, Surface Roughness, and Optical Characteristics

Soliman

2024

Advances in Polymer Technology

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Synthesis, structural, and physical properties of polyvinyl alcohol/carboxymethyl cellulose blend films induced by gamma-irradiation

Zaki,

Elkalashy,

Vshivkov

et al. 2023

Opt Quant Electron

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Assessment the exposure effects of polycarbonate with X-ray radiation using spectroscopic techniques and molecular modeling calculations

Zaki,

Rashad,

Elkalashy

et al. 2023

Opt Quant Electron

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In this article, the effects of 6 MeV energy of X-ray radiation on polycarbonate polymeric lms were investigated. The induced alterations are assessed using several methodologies: FTIR spectroscopy, contact angle measurements, surface roughness assessment, UV/Vis spectroscopy, and luminescence emission spectroscopy. As well, using the basic sets in the ground state of the polycarbonate structure, the vibrational analysis has been carried out using the density functional theory (DFT). The FTIR spectra display that the X-ray irradiation produces surface chemical alterations in the irradiated lms due to successive degradation mechanisms due to the decrease in the detected band peaks. The basis sets that were calculated using the DFT method are in good agreement with the experimentally observed spectra.The frontier molecular orbital energies are used to assess the molecule's energy gap (HOMO-LUMO). The value of the frontier energy gap re ects the chemical reactivity and intermolecular charge transfer that take place within the molecule. The surface wettability behaviors were amended due to the decrease in the contact angle values of irradiated lms. This leads to an increase in the surface roughness and surface free energy. X-ray irradiation can enhance the surface goodness of polycarbonate lms and control their surface properties to be used in biocompatibility applications. The optical properties of irradiated lms show modi cations in the studied optical parameters. The absorbance spectra exhibited a shift in the absorption edge of the irradiated samples compared with the pristine one. This shift indicates the decreases in the band gap energy of irradiated samples. For direct transitions, the band gap decreased from 4.03 to 3.125 eV, and for indirect transitions, it decreased from 3.5 0 to 2.65 eV. This result was attributable to the formation of defects and the creation of complex charge transfer due to Xray irradiation. The photoluminescence emission spectra show that the peak intensities are obviously in uenced by increasing the irradiation doses. This is attributable to the band-band transition, donor/acceptor pairs, and bound to free transition, which correlated to the received absorbed dose.of oxidation products, polar components, creation of ionic chemical species, gaseous and water molecules production, loss of volatile fragments and the generation of free radicals that can cause scission and/or cross-linking mechanisms [11][12][13]. The two mechanisms are reliant on the polymer's nature and the environmental conditions, and consequently, scissioning and crosslinking are competing phenomena. Moreover, the natural behaviors of these changes in the irradiated polymeric lms depend on the interfering factors, like the composition of the polymer and its molecular weight, and also on the types of radiation and its energy [14][15][16]. Polymers are gaining popularity due to their numerous advantages, including ease of processing, and several degrees of elasticity or stiffness. They are also more affordable overall d...

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A comparative study of the structural, optical and morphological properties of different types of Makrofol polycarbonate

Cited by 11 publications

References 36 publications

Effects of SiO2 Nanoparticles on Polyvinyl Alcohol/Carboxymethyl Cellulose Polymer Blend Films’ Structural, Wettability, Surface Roughness, and Optical Characteristics

Effects of SiO2 Nanoparticles on Polyvinyl Alcohol/Carboxymethyl Cellulose Polymer Blend Films’ Structural, Wettability, Surface Roughness, and Optical Characteristics

Synthesis, structural, and physical properties of polyvinyl alcohol/carboxymethyl cellulose blend films induced by gamma-irradiation

Assessment the exposure effects of polycarbonate with X-ray radiation using spectroscopic techniques and molecular modeling calculations

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