Investigation of mechanical properties, antibacterial features, and water vapor permeability of polyvinyl alcohol thin films reinforced by glutaraldehyde and multiwalled carbon nanotube

2013 ◽  
Vol 35 (9) ◽  
pp. 1736-1743 ◽  
Author(s):  
Seyed Mohammad Mahdi Dadfar ◽  
Gholamreza Kavoosi ◽  
Seyed Mohammad Ali Dadfar
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Water Vapor ◽  
Carbon Nanotube ◽  
Polyvinyl Alcohol ◽  
Water Vapor Permeability ◽  
Multiwalled Carbon Nanotube ◽  
Vapor Permeability ◽  
Multiwalled Carbon

Properties of SiOx/PET Thin Films Prepared by RF Magnetron Sputtering

2011 ◽  
Vol 380 ◽  
pp. 238-243 ◽  
Author(s):  
Hui Zhi ◽  
Jing Lin ◽  
Bo Zhang
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Water Vapor ◽  
Magnetron Sputtering ◽  
Process Parameters ◽  
Surface Composition ◽  
Water Vapor Permeability ◽  
Rf Magnetron Sputtering ◽  
Vapor Permeability ◽  
The Relationship

The SiOx thin films for food packaging were deposited by RF magnetron sputtering physical vapor technology on the substrates of 20μm polyethylene terephthalate (PET) by using a pure SiO2 target. The molecular structure of thin film surface composition were detected and analyzed by Fourier transform infrared spectroscopy (FTIR); and the barrier properties of the films were examined by MOCON water vapor permeability testing instrument, also，the relationship maps between permeability and process parameters were drew and the process parameters were optimized; The mechanical properties of thin films were tested by electronic tensile testing machine, and the curves of the relationship between the mechanical properties and process parameters depicted. The SiOx/PET thin films of the lowest water vapor permeability were prepared under the pressure of 7.5×10-3 Pa, the sputtering pressure of 0.23 Pa, the deposition time of 30min and the sputtering power of 1500W. The yield strength increased 4 times and elastic modulus increased 3 times when the water vapor permeability of the SiOx/PET thin films rose about 10 times of the blank.

Ultraviolet blocking and antioxidant polyvinyl alcohol films incorporated with baicalin extraction from Scutellaria baicalensis Georgi

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Jinshu Liu ◽  
Xiaoyan Ma ◽  
Wenzhao Shi ◽  
Jianwei Xing ◽  
Chaoqun Ma ◽  
...  
Keyword(s):  
Water Vapor ◽  
Polyvinyl Alcohol ◽  
Radical Scavenging Activity ◽  
Antioxidant Properties ◽  
Radical Scavenging ◽  
Water Vapor Permeability ◽  
Scutellaria Baicalensis ◽  
Vapor Permeability ◽  
Protective Film ◽  
Uv Blocking

Abstract Baicalin, an active flavonoid ingredient of Scutellaria baicalensis Georgi, was extracted by heat reflux extraction and showed the same significance UV absorption property with standard baicalin. Active films were prepared from polyvinyl alcohol (PVA) containing baicalin extract by casting method. The effect of baicalin extracts on the UV-blocking, optical, antioxidant property, water vapor permeability, swelling and mechanical properties of the films were studied. UV–vis transmittance spectra showed that PVA films incorporated with baicalin extract blocked ultraviolet light range from 280–400 nm even with low concentration of baicalin (0.5 wt%) and maintain the high transparency in visible spectrum. The outstanding UV-blocking properties of PVA films incorporated with baicalin extract were also confirmed by Rhodamine B degradation. Baicalin conferred antioxidant properties to PVA films as determined by DPPH radical scavenging activity. Due to the interaction between hydroxy groups of baicalin and PVA molecule, water vapor permeability, swelling and elongation at break of the films were decreased accompanied with the increasing in tensile strength and Young’s modulus. FTIR reveal that the interaction between PVA molecules was significant changed by the introduction of baicalin. These results suggest that PVA film incorporated with baicalin extract can be used for the development of functional protective film.

scholarly journals Development of PE/PCL Bilayer Films Modified with Casein and Aluminum Oxide

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3090
Author(s):  
Anita Ptiček Siročić ◽  
Ana Rešček ◽  
Zvonimir Katančić ◽  
Zlata Hrnjak-Murgić
Keyword(s):  
Mechanical Properties ◽  
Thermal Properties ◽  
Water Vapor ◽  
Aluminum Oxide ◽  
Water Vapor Permeability ◽  
Vapor Permeability ◽  
Mechanical And Thermal Properties ◽  
Oxide Compound ◽  
Bilayer Films ◽  
Oxide Particles

The studied samples were prepared from polyethylene (PE) polymer which was coated with modified polycaprolactone (PCL) film in order to obtain bilayer films. Thin PCL film was modified with casein/aluminum oxide compound to enhance vapor permeability as well as mechanical and thermal properties of PE/PCL films. Casein/aluminum oxide modifiers were used in order to achieve some functional properties of polymer film that can be used in various applications, e.g., reduction of water vapor permeability (WVTR) and good mechanical and thermal properties. Significant improvement was observed in mechanical properties, especially in tensile strength as well as in water vapor values. Samples prepared with aluminum oxide particles indicated significantly lower values up to 60%, and samples that were prepared with casein and 5% Al2O3 showed the lowest WVTR value.

Electrical and mechanical properties of flexible multiwalled carbon nanotube/poly (dimethylsiloxane) based nanocomposite sheets

2021 ◽  
pp. 106550
Author(s):  
Leema Rose Viannie ◽  
N.R. Banapurmath ◽  
Manzoore Elahi M. Soudagar ◽  
Anilkumar V. Nandi ◽  
Nazia Hosain ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotube ◽  
Multiwalled Carbon Nanotube ◽  
Multiwalled Carbon

Structural and mechanical properties of free-standing multiwalled carbon nanotube paper prepared by an aqueous mediated process

2017 ◽  
Vol 52 (12) ◽  
pp. 7503-7515 ◽  
Author(s):  
Sushant Sharma ◽  
Bhanu Pratap Singh ◽  
Arun Singh Babal ◽  
Satish Teotia ◽  
Jeevan Jyoti ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotube ◽  
Multiwalled Carbon Nanotube ◽  
Free Standing ◽  
Multiwalled Carbon

Fabrication of Composite Films Based on Chitosan and Vegetable-Tanned Collagen Fibers Crosslinked with Genipin

2021 ◽  
Vol 116 (10) ◽  
Author(s):  
Jie Liu ◽  
Yanchun Liu ◽  
Eleanor M. Brown ◽  
Zhengxin Ma ◽  
Cheng-Kung Liu
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Water Vapor ◽  
Composite Film ◽  
Composite Films ◽  
Value Added ◽  
Water Vapor Permeability ◽  
Vapor Permeability ◽  
Leather Industry ◽  
Compact Structure

The leather industry generates considerable amounts of solid waste and raises many environmental concerns during its disposal. The presence of collagen in these wastes provides a potential protein source for the fabrication of bio-based value-added products. Herein, a novel composite film was fabricated by incorporating vegetable-tanned collagen fiber (VCF), a mechanically ground powder-like leather waste, into a chitosan matrix and crosslinked with genipin. The obtained composite film showed a compact structure and the hydrogen bonding interactions were confirmed by FTIR analysis, indicating a good compatibility between chitosan and VCF. The optical properties, water absorption capacity, thermal stability, water vapor permeability and mechanical properties of the composite films were characterized. The incorporation of VCF into chitosan led to significant decreases in opacity and solubility of the films. At the same time, the mechanical properties, water vapor permeability and thermal stability of the films were improved. The composite film exhibited antibacterial activity against food-borne pathogens. Results from this research indicated the potential of the genipin-crosslinked chitosan/VCF composites for applications in antimicrobial packaging. 

Sign in / Sign up

Export Citation Format

Share Document