Effect of UV irradiation on optical, mechanical and microstructural properties of PVA/NaAlg blends

Sheela, T.; Bhajantri, R. F.; Ravindrachary, V.; Rathod, Sunil G.; Pujari, P. K.; Poojary, Boja; Somashekar, R.

doi:10.1016/j.radphyschem.2014.05.036

Cited by 50 publications

(24 citation statements)

References 30 publications

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“…The influence of crosslinking reaction values on the mechanical properties of PVA films is listed in Table as the dependence of Young's modulus ( E ), tensile strength and elongation at break on the degree of crosslinking with GA. The results clearly show significant reduction in E as well as tensile strength, thereby demonstrating the progress of the crosslinking reaction and action of the GA plasticizer—i.e., the formation of transverse bonds; although such decrease permits flexibility in chain mobility . Elongation at break, which is determined at the point where the film breaks under tensile stress, provides data on the flexibility and stretch capacity of the film.…”

Section: Resultssupporting

confidence: 88%

Immobilization of bacteriocin nisin into a poly(vinyl alcohol) polymer matrix crosslinked with nontoxic dicarboxylic acid

Hrabalíková

Holčapková

Šuly

et al. 2016

J of Applied Polymer Sci

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This work is focused on novel methodology of poly(vinyl alcohol) crosslinking by non-toxic dicarboxylic acid, glutaric acid. The cross-linked system was used as a matrix for immobilization of bacteriocin nisin. Effect of the crosslinking degree on physico-chemical, morphology, mechanical, and thermal properties of poly(vinyl alcohol) films were investigated by using swelling test, Fourier transform infrared spectroscopy, scanning electron microscopy, stress-strain analysis, differential scanning calorimetry, and thermogravimetry. Release profile of the nisin from the cross-linked poly(vinyl alcohol) was studied by high performance liquid chromatography. Antibacterial activity of the prepared systems was tested by agar diffusion test and dilution and spread plate technique. Results showed suitability of glutaric acid as effective crosslinking agent of poly(vinyl alcohol) that acts synergistically with bacteriocin nisin against the tested Gram-positive and Gram-negative bacterial strains. V C 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43674.

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Section: Resultssupporting

confidence: 88%

Immobilization of bacteriocin nisin into a poly(vinyl alcohol) polymer matrix crosslinked with nontoxic dicarboxylic acid

Hrabalíková

Holčapková

Šuly

et al. 2016

J of Applied Polymer Sci

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“…For the SA film, the bands at approximately 3300 cm −1 are assigned to the stretching vibrations of the hydroxyl group, respectively [41]. The band corresponding to asymmetric stretching vibrations of the methylene group occurs at approximately 2931 cm −1 [42]. The stretching vibration of the carboxylate anion -COO − exhibits two characteristic absorption peaks at 1590 and 1411 cm −1 , corresponding to asymmetric and symmetric stretching vibration of the carboxylate group, respectively [43][44][45].…”

Section: Ftir Analysismentioning

confidence: 99%

Preparation and Properties of Sodium Carboxymethyl Cellulose/Sodium Alginate/Chitosan Composite Film

2018

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A sodium alginate/chitosan solution was prepared by dissolving sodium alginate, chitosan, and glycerol in an acetic acid solution. This solution was then combined with a sodium carboxymethyl cellulose solution and the mixture was cast onto a glass plate and dried at a constant temperature of 60 • C. Then, a carboxymethyl cellulose/sodium alginate/chitosan composite film was obtained by immersing the film in a solution of a cross-linking agent, CaCl 2 , and air-drying the resulting material. First, the most advantageous contents of the three precursors in the casting solution were determined by a completely random design test method. Thereafter, a comprehensive orthogonal experimental design was applied to select the optimal mass ratio of the three precursors. The composite film obtained with sodium alginate, sodium carboxymethyl cellulose, and chitosan contents of 1.5%, 0.5%, and 1.5%, respectively, in the casting solution displayed excellent tensile strength, water vapor transmission rate, and elongation after fracture. Moreover, the presence of chitosan successfully inhibited the growth and reproduction of microorganisms. The composite film exhibited antibacterial rates of 95.7% ± 5.4% and 93.4% ± 4.7% against Escherichia coli and Staphylococcus aureus, respectively. Therefore, the composite film is promising for antibacterial food packaging applications.

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“…With different kinds of additives or dopants further these properties can be improved or fine-tuned [2][3][4][5]. Also, there are fair number of irradiation techniques applied to modify the properties of PVA films [6][7][8][9]. The work presented here is another method used to process PVA in view of physical and electrical properties changes.…”

Section: Introductionmentioning

confidence: 99%

Study on effects of shockwave treatment on PVA films in view of electrical property changes

Thirumalesh

Raju²,

Swaroop

et al. 2020

Mater. Res. Express

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The shock wave impact effects have been studied on PVA (Poly Vinyl Alcohol), thin films in view of morphological and electrical property changes. The PVA films of thickness around 0.25 mm are subjected to shock waves impact of Mach number around 1.7 to 1.8. The samples are subjected to 0, 25, 50, 100 and 150 numbers of shocks, in a time interval of around 15 s between the shocks. The shock waves are generated with an in-house developed shock tube capable of producing shock waves of Mach number up to 2. The films are further characterized with FTIR, UV-visible spectral analysis for chemical and physical changes and the EDAX, SEM image analysis further confirmed the effects. The trend in the I-V characteristics and the impedance data obtained clearly shows the significant increase in the conductivity of PVA films. Thus, shock wave impact method proves to be another method of treatment of materials and the results obtained promises about the possible electrical applications of PVA films.

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Effect of UV irradiation on optical, mechanical and microstructural properties of PVA/NaAlg blends

Cited by 50 publications

References 30 publications

Immobilization of bacteriocin nisin into a poly(vinyl alcohol) polymer matrix crosslinked with nontoxic dicarboxylic acid

Immobilization of bacteriocin nisin into a poly(vinyl alcohol) polymer matrix crosslinked with nontoxic dicarboxylic acid

Preparation and Properties of Sodium Carboxymethyl Cellulose/Sodium Alginate/Chitosan Composite Film

Study on effects of shockwave treatment on PVA films in view of electrical property changes

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