Synthesis, Characterization and Antibacterial Activity of ε-Polylysine/PVA Biodegradable Film

2013 ◽  
Vol 834-836 ◽  
pp. 96-99 ◽  
Author(s):  
Zhi Lei Tan ◽  
Miao Miao Xia ◽  
Shi Ru Jia ◽  
Fang Lian Yao
Keyword(s):  
Mechanical Properties ◽  
Antibacterial Activity ◽  
Young Modulus ◽  
Biodegradable Films ◽  
Biodegradable Film ◽  
Neat Polymer ◽  
Elongation At Break ◽  
Good Antibacterial Activity ◽  
Potential Applications ◽  
Packaging Industry

ε-polylysine (ε-PL) was blended with polyvinyl alcohol (PVA) to obtain biodegradable films. Blends and neat polymer films (PVA) were characterized for their structural and mechanical properties as well as antibacterial activity. The addition of ε-polylysine reduced Young modulus (Eyoung), tensile strength (TS) and elongation at break (%E) of the ε-polylysine/PVA film. The ε-polylysine/PVA film shows good antibacterial activity and therefore has potential applications in packaging industry.

scholarly journals Thermal and Mechanical properties of epoxy-jute fiber composite

2014 ◽  
Vol 27 (2) ◽  
pp. 77-82 ◽  
Author(s):  
H Ahmad ◽  
MA Islam ◽  
MF Uddin
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Tensile Strength ◽  
Fiber Length ◽  
Epoxy Composite ◽  
Fiber Composite ◽  
Young Modulus ◽  
Fiber Content ◽  
Jute Fiber ◽  
Elongation At Break

Chopped jute fiber-epoxy composites with varying fiber length (2-12 mm) and mass fraction (0.05-0.35) had been prepared by a heat press unit. The cross-linked product was characterized in terms of specific gravity, thermal conductivity, tensile strength, Young modulus and elongation at break. The transverse thermal conductivities for randomly oriented fibers in the composite were investigated by Lees and Charlton’s method. The tensile strength, Young modulus and elongation at break were investigated by a Universal Tensile Tester. With an increase in the fiber content (irrespective of the fiber length), the thermal conductivity of the composite decreases; the decreasing rate being highest for the fiber length of 2 mm followed by that for the fiber length of 6 and 12 mm. The decreasing rate of the thermal conductivity of the jute-epoxy composite is comparatively higher to that reported in literature for acrylic polymer hemp fiber composite. The tensile strength also decreases with the increase of the fiber content in the composite. The fiber length does not show to have significant effect on the tensile strength of the composite; the variation in strength being masked within experimental error. The Young modulus increases with the increase of fiber content within elastic limit; showing the highest values for the fiber length of 6 mm followed by those for the fiber length of 2 mm and 12 mm. The elongation at break shows slightly increasing trend up to 15% fiber content, but beyond that it decreases drastically. The specific gravity decreases with the increase in the fiber content and thus the recalculated specific tensile strength is found to keep at a stable level of 36MPa up to the fiber content of 20%, and beyond that the specific tensile strength decreases with the increase in the fiber content. It is concluded that jute fiber-epoxy composite could be used as a good heat-insulating material. Further investigation is recommended on the improvement of the thermal insulation keeping the mechanical properties unchanged or even improved. The TGA study is also required to ascertain the field of application of the material. DOI: http://dx.doi.org/10.3329/jce.v27i2.17807 Journal of Chemical Engineering, IEB Vol. ChE. 27, No. 2, December 2012: 77-82

scholarly journals Modification of Collagen Properties with Ferulic Acid

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3419 ◽  
Author(s):  
Beata Kaczmarek ◽  
Katarzyna Lewandowska ◽  
Alina Sionkowska
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Ferulic Acid ◽  
Surface Properties ◽  
Apparent Viscosity ◽  
Young Modulus ◽  
Shear Tests ◽  
Elongation At Break ◽  
Collagen Solution ◽  
Significant Difference

Collagen materials are widely used in biomedicine and in cosmetics. However, their properties require improvement for several reasons. In this work, collagen solution as well as collagen films were modified by the addition of ferulic acid (FA). Thin collagen films containing FA were obtained by solvent evaporation. The properties of collagen solution have been studied by steady shear tests. The structure and surface properties of collagen thin films were studied. It was found that for collagen solution with 5% addition of FA, the apparent viscosity was the highest, whereas the collagen solutions with other additions of FA (1%, 2%, and 10%), no significant difference in the apparent viscosity was observed. Thin films prepared from collagen with 1 and 2% FA addition were homogeneous, whereas films with 5% and 10% FA showed irregularity in the surface properties. Mechanical properties, such as maximum tensile strength and elongation at break, were significantly higher for films with 10% FA than for films with smaller amount of FA. Young modulus was similar for films with 1% and 10% FA addition, but bigger than for 2% and 5% of FA in collagen films. The cross-linking of collagen with ferulic acid meant that prepared thin films were elastic with better mechanical properties than collagen films.

scholarly journals Research Regarding the Mechanical Properties of Some Biodegradable Polymeric Composites for Food Packaging Products

2018 ◽  
Vol 55 (4) ◽  
pp. 498-501
Author(s):  
Constantin Gheorghe Opran ◽  
Elena Grosu ◽  
Marius Enachescu
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Injection Molding ◽  
Biodegradable Polymers ◽  
Food Packaging ◽  
Young Modulus ◽  
Important Application ◽  
Elongation At Break ◽  
Amorphous Character ◽  
Sem Analyses

Biodegradable polymers became one of the most important materials with large applicability, as they do not generate wastes after life cycle. An important application is food packaging fabricated by injection molding processing. In this paper, we present the investigation of the mechanical properties of some biodegradable polymers based on PLA composites obtained by melting processing and their morphology studied by SEM analyses, in comparison to polypropylene and neat PLA. We found out that tensile strength, elongation at break and Young modulus exhibit values appropriate to injection molding processing and they are very close related to crystalline or amorphous character of the materials.

Preparation and Characterization of Poly(Vinyl Alcohol)(PVA)/Hydroxyapatite (HA) Nanofibrous Scaffolds

2011 ◽  
Vol 284-286 ◽  
pp. 459-463 ◽  
Author(s):  
Yuan Yuan Qi ◽  
Bin Liu ◽  
Xing Bin Yan
Keyword(s):  
Mechanical Properties ◽  
Drug Delivery ◽  
Tissue Engineering ◽  
Tensile Strength ◽  
Drug Delivery Systems ◽  
Poly Vinyl Alcohol ◽  
Elongation At Break ◽  
Nanofibrous Scaffolds ◽  
Potential Applications

Nanofibrous scaffolds of PVA and HA were prepared by electrospinning. SEM showed the scaffolds had porous nanofibrous morphology, and the diameter of the fibers was in the range of 200-1000 nm. FTIR and XRD showed the presence of HA in the scaffolds. The mechanical properties of the scaffolds changed by the adding content of HA. For the nanoscaffolds with 2wt % HA, the ultimate tensile strength and the elongation at break was 7.5 MPa and 17%. The PVA/HA nanoscaffolds prepared by electrospinning indicated good properties, and had a potential applications in bone tissue engineering and drug delivery systems.

Atomic Structure and Mechanical Properties of Defective Carbon Nanotube (7,7)

2016 ◽  
Vol 843 ◽  
pp. 78-84
Author(s):  
Sergey Anatolevich Sozykin ◽  
Valeriy Petrovich Beskachko ◽  
G.P. Vyatkin
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotube ◽  
Atomic Structure ◽  
Young Modulus ◽  
Vacancy Defect ◽  
First Principle ◽  
Single Vacancy ◽  
Elongation At Break ◽  
Vacancy Defects ◽  
Defect Type

The article presents the results of first-principle modeling of a defectless (7,7) carbon nanotube and (7,7) nanotubes containing single and double vacancy defects, as well as Stone–Wales defects. These types of defects are often found in real nanotubes and affect their properties. We have established that reliable results can be obtained by using models of more than 1.5 nm in length. It turned out that a single vacancy defect has the least influence on Young modulus, and double n type vacancy defect in the most influential. The elongation at break also depends on the defect type and is 30-60% less than for perfect tubes.

scholarly journals Use of Chia by-Products Obtained from the Extraction of Seeds Oil for the Development of New Biodegradable Films for the Agri-Food Industry

Foods ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 620
Author(s):  
Nuria Muñoz-Tebar ◽  
Ana Molina ◽  
Manuel Carmona ◽  
María Isabel Berruga
Keyword(s):  
Mechanical Properties ◽  
Economic Value ◽  
Water Vapor Permeability ◽  
Edible Films ◽  
Vapor Permeability ◽  
Biodegradable Films ◽  
Biodegradable Film ◽  
Production And Consumption ◽  
Different Types ◽  
By Products

Chia oil production and consumption have increased in recent years, producing a large number of by-products that had low utility or economic value for the industry. In this study, a biodegradable film was successfully prepared from mucilage extracted from defatted chia flour. The physical-chemical, optical, water vapor permeability (WVP), and mechanical properties of films made with two different types of chia matrixes (defatted flour and whole seeds) were determined. In general, defatted chia flour films exhibited a slightly reddish and yellowish color but still transparent in appearance, were good visible light barriers, and had better mechanical properties than films made with whole seeds. They also have greater WVP values than synthetic films such as low-density polyethylene. The results of the present study demonstrated that defatted chia flour can be used in producing edible films with improved quality characteristics.

scholarly journals A freeze–thaw PVA hydrogel loaded with guava leaf extract: physical and antibacterial properties

RSC Advances ◽  
2021 ◽  
Vol 11 (48) ◽  
pp. 30156-30171
Author(s):  
William Xaveriano Waresindo ◽  
Halida Rahmi Luthfianti ◽  
Dhewa Edikresnha ◽  
Tri Suciati ◽  
Fatimah Arofiati Noor ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Polyvinyl Alcohol ◽  
Wound Dressing ◽  
Leaf Extract ◽  
Antibacterial Properties ◽  
Freeze Thaw ◽  
Good Antibacterial Activity ◽  
Potential Applications ◽  
Guava Leaf ◽  
Pva Hydrogel

A polyvinyl alcohol (PVA) hydrogel loaded with guava leaf extract (GLE) has potential applications as a wound dressing with good antibacterial activity.

scholarly journals EFFECT OF PLASTICIZERS ON MECHANICAL PROPERTIES OF EDIBLE FILM FROM JANENG STARCH – CHITOSAN

2016 ◽  
Vol 16 (2) ◽  
pp. 45-49
Author(s):  
Narlis Juandi ◽  
Rahmi Rahmi ◽  
Hira Helwati
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Palm Oil ◽  
Edible Films ◽  
Ftir Spectra ◽  
Edible Film ◽  
Biodegradable Films ◽  
Elongation At Break

The interest in the development of edible and biodegradable films has increased because it is every day more evident that non degradable are doing much damage to the environment. In this research, edible films were based on blends of janeng starch in different proportions, added of palm oil or glycerol, which were used as plasticizers. The objective was to study the effect of two different plasticizers, palm oil and glycerol of edible film from janeng starch–chitosan on the mechanical properties and FTIR spectra. Increasing concentration of glycerol as plasticizer resulted tend to increased tensile strength and elongation at break. The tensile strength and elongation at break values for palm oil is higher than glycerol as plasticizer at the same concentration. FTIR spectra show the process of making edible film from janeng starch–chitosan with palm oil or glycerol as plasticizers are physically mixing in the presence of hydrogen interactions between chains.

scholarly journals Development of Electrically Conductive Nanocrystalline Thin Film for Optoelectronic Applications

2013 ◽  
Vol 15 ◽  
pp. 90-101 ◽  
Author(s):  
Sujan Kumar Das ◽  
Jahid M.M. Islam ◽  
Monirul Hasan ◽  
Humayun Kabir ◽  
Md Abdul Gafur ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Electrical Properties ◽  
Composite Films ◽  
Young Modulus ◽  
Electrically Conductive ◽  
Elongation At Break ◽  
Ohmic Behavior ◽  
Nanocrystalline Thin Film ◽  
Electrically Conductive Composite

Sodium alginate (TiO2) sand composites were prepared by solution casting. Purified sand was added in the composite films to increase electrical conductivity. Electrical properties such as conductivity, capacitance, dielectric constant, and loss tangent of the composites were investigated. The current voltage characteristics for all the composites showed ohmic behavior. All the electrical properties have been found to improve with the incorporation of sand (SiO2) but 6% sand containing composite exhibits the best electrical properties. The mechanical properties tensile strength (TS), elongation at break (Eb) and Young modulus for 6% sand containing composite film are found to be 4.445 MPa, 9.76%, and 72.8 MPa respectively. The experimental results reveal that the blended films exhibit higher stability and improved mechanical properties of both tensile strength and elongation at break in dry state. Water absorption properties of the composites are found to decrease with the increase of sand content. Lowest water uptake properties and highest stability were demonstrated by 6% sand containing sample. Electrically conductive composite films have useful applications for solar cells and optoelectronics. Thus, this study is very much expected to aid in the design and selection of proper composite for the potential application of solar cell and optoelectronics.

scholarly journals Hybrid Nanocarbons Reinforced Rubber Nanocomposites: Detailed insights about Mechanical, Dynamical Mechanical Properties, Payne and Mullin Effects

2018 ◽  
Author(s):  
Suneel Kumar Srivastava ◽  
Yogendra Kumar Mishra
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Young Modulus ◽  
Expanded Graphite ◽  
Dynamic Mechanical Properties ◽  
Multiwalled Carbon ◽  
Elongation At Break ◽  
Hybrid Fillers ◽  
Rubber Nanocomposites ◽  
Walled Carbon Nanotubes

The reinforcing ability of the fillers results in significant improvements in properties of polymer matrix at extremely low filler loadings compared to conventional fillers. In view of this, present review article describes the different methods used in preparation of different rubber nanocomposites reinforced with nanodimensional individual carbonaceous fillers, such as graphene, expanded graphite, single walled carbon nanotubes, multiwalled carbon nanotubes and graphite oxide, graphene oxide and hybrid fillers consisting combination of individual fillers. This is followed by review of mechanical properties (tensile strength, elongation at break, Young modulus, and fracture toughness) and dynamic mechanical properties (glass transition temperature, crystallization temperature, melting point) of these rubber nanocomposites. Finally, Payne and Mullin Effects have also been reviewed in rubber filled with different carbon based nanofillers.

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