Preparation of PAM/PVA blending films by solution-cast technique and its characterization: a spectroscopic study

Patel, G. N.; Sureshkumar, M. B.

doi:10.1007/s13726-013-0211-x

Cited by 34 publications

(29 citation statements)

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“…Figure A displays the FTIR spectra of polyblend films (Na‐CMC(%)/PAM(%) = 0/100, 25/75, 50/50, 75/25, and 100/0). The broad absorption band extended from approximately 3360 to approximately 3800 and its maximum intensity at 3680 cm −1 is attributed to the stretching of the OH groups of Na‐CMC and the deformation vibration of the absorbed water molecules in PAM . The spectrum of PAM shows two bands at approximately 3227 and 1187 cm −1 , which are assigned to the N─H group stretching vibration of the primary amide.…”

Section: Resultsmentioning

confidence: 98%

“…As can be noted, the intensities of these three bands are enhanced with increasing Na‐CMC content, because of the increased number of CH 2 and ─COO─ groups in the polyblend. The strong band at 1707 is assigned to the C═O stretching (amide I) . The significant characteristic peak at 1600 cm −1 is of N─H bending vibration (amide II) of the amide group of PAM .…”

Section: Resultsmentioning

confidence: 99%

“…Polyacrylamide (PAM) is a linear, biocompatible, nontoxic, and polar polymer. Its ability to make strong interactions with other polymers and with the drug molecules, via the hydrogen bonding formation, facilitates its use for drug diffusion and release . Although it exhibits some weak mechanical properties, the blending of CMC and PAM is expected to provide a good film .…”

Section: Introductionmentioning

confidence: 99%

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Characterization, optical, and nanoscale free volume properties of Na‐CMC/PAM/CNT nanocomposites

Awad

El‐Gamal

Sayed

et al. 2019

Polymers for Advanced Techs

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Polyblend and nanocomposite films of sodium salt of carboxymethylcellulose (Na‐CMC)/polyacrylamide (PAM) and Na‐CMC/PAM modified with carbon nanotubes (CNT) were synthesized by the solution casting technique. The effect of PAM and CNT loading on the structural, optical, and nanoscale free volume properties of Na‐CMC was studied. X‐ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy exhibited the existence of strong interactions between Na‐CMC and PAM and the non‐destructive effect of CNT on Na‐CMC/PAM structure. The HR‐TEM revealed the multi‐walled structure of CNT with a 7.06‐nm wall thickness and a 6.92‐nm wall inner diameter. Positron annihilation lifetime spectroscopy (PALS) was done, in a vacuum and at 30°C to 200°C, to investigate the nanoscale free volume properties by using a conventional fast‐fast coincidence spectrometer. It was found that the o‐Ps lifetime (τ3) and free volume (Vh) increase with increasing CNT percentage in the Na‐CMC/PAM blend. The distribution of the o‐Ps lifetime was broadened with increasing CNT ratios. Furthermore, the glass transition temperature (Tg) increases with increasing loads of CNT. For the first time, a correlation was done between Urbach energy (EU) and Vh. Finally, the results were represented and discussed in the frame of free volume properties. Optical measurements showed that the transmittance T% of Na‐CMC/PAM was 91.12% and decreased to 68.42% and 36.45% after loading with 1.0 and 2.0 wt % CNT. In addition, the blend shows higher insulating properties compared with the individual polymers. The CNT incorporation reduces the band gap significantly and increases the EU in the films.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterization, optical, and nanoscale free volume properties of Na‐CMC/PAM/CNT nanocomposites

Awad

El‐Gamal

Sayed

et al. 2019

Polymers for Advanced Techs

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“…Membrane fouling is a reversible process that causes decline in permeate flux. The flux (8) ↑ Porosity =↑ Water flux On the whole, PVDF/SBS-MWCNTs-SCN-Ag membranes showed better membrane performance relative to PVDF/SBS-MWCNTs-SCN and other membranes. The reason behind improved efficiency of the membranes was the presence of thiocyanate groups which provided better binding sites for silver nanoparticles forming nano-structured morphology.…”

Section: Membrane Propertiesmentioning

confidence: 96%

“…To further improve the material properties, surface changes (chemical vapor deposition, UV, and plasma grafting) and membrane preparation methods (stretching, thermally induced phase separation, and non-solvent-induced phase separation) have been also investigated [7,8]. PVDF…”

Section: Introductionmentioning

confidence: 99%

High-performance polyvinylidene fluoride/poly(styrene–butadiene–styrene)/functionalized MWCNTs-SCN-Ag nanocomposite membranes

2015

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content on membrane performance and structure was studied using pertinent methods and techniques. Percentage of water content of PVDF/SBS-MWCNTs-SCN 0.01-0.1 was estimated around 1.08-2.80 % and this value was further increased to 1.94-4.65 % in silver nanoparticle-modified system. Moreover, the porosity of silver nanoparticle-modified system was found superior compared with the other composites. Pure water flux, salt rejection, and recovery were also found optimal for 0.05 wt% silver nanoparticlebased modified system. According to the consequences, novel membranes have fine nano-filtration characteristics to be utilized in advance water treatment industrial units.

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Influence of MWCNTs in Improving the Optical, DC Conductivity, and Mechanical Properties of CMC/PAAM Blends

El‐Gamal

Sayed

2020

Polymer Engineering & Sci

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Enhancing the optical, electrical, and mechanical properties of polymeric materials, by blending with another material and doping with nano-fillers, is crucial for improving their performance in optoelectronic, biological, and medical applications. In this work, the influence of adding multiwalled carbon nanotubes (MWCNTs) on the physical properties of carboxymethyl cellulose/polyacrylamide blends is reported. Scanning electron microscopy was used for investigating films' surface morphology and revealed good distribution of MWCNTs on the blend surface. UV-vis-IR spectroscopy showed that absorption and refractive indices, and other dispersion parameters could be controlled by adjusting the films' compositions. Loading 2 wt% MWCNTs narrowed the optical bandgap of the blend from 5.1 to 4.1 eV. Doping with MWCNTs raised the DC conductivity by about two orders of magnitude by forming threedimensional pathways within the blend matrix. The storage modulus increased with MWCNTs loading by 39.3% for the 2 wt% ratio while decreasing with increasing temperature.

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Preparation of PAM/PVA blending films by solution-cast technique and its characterization: a spectroscopic study

Cited by 34 publications

References 50 publications

Characterization, optical, and nanoscale free volume properties of Na‐CMC/PAM/CNT nanocomposites

Characterization, optical, and nanoscale free volume properties of Na‐CMC/PAM/CNT nanocomposites

High-performance polyvinylidene fluoride/poly(styrene–butadiene–styrene)/functionalized MWCNTs-SCN-Ag nanocomposite membranes

Influence of MWCNTs in Improving the Optical, DC Conductivity, and Mechanical Properties of CMC/PAAM Blends

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