Development of Electrically Conductive Nanocrystalline Thin Film for Optoelectronic Applications

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.

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Thermal and Mechanical properties of epoxy-jute fiber composite

Journal of Chemical Engineering ◽

10.3329/jce.v27i2.17807 ◽

2014 ◽

Vol 27 (2) ◽

pp. 77-82 ◽

Cited By ~ 1

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 Charltons 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

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Preparation and Properties of Biocomposite Film with Gelatin and Poly(Vinyl Alcohol)

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.287-290.302 ◽

2011 ◽

Vol 287-290 ◽

pp. 302-305

Author(s):

Xi Ping Gao ◽

Ke Yong Tang ◽

Yu Qing Zhang

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Optical Properties ◽

Vinyl Alcohol ◽

Composite Films ◽

Poly Vinyl Alcohol ◽

Elongation At Break ◽

Biocomposite Film

The mechanical properties, swelling, solubility, and optical properties of composite films with poly(vinyl alcohol) (PVA) and gelatin were studied. With increasing the PVA content in the composite films, the tensile strength (TS) and elongation at break (EB) of the films increase. The swelling and solubility are different with different gelatin/PVA ratios, with the lowest at 1:5.

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

Materiale Plastice ◽

10.37358/mp.18.4.5061 ◽

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.

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Electrically Conductive Composite of Polypyrrole and Liquid Crystalline Aromatic Copolyamide

MRS Proceedings ◽

10.1557/proc-247-699 ◽

1992 ◽

Vol 247 ◽

Author(s):

Jing-Sheng Bao ◽

C. C. Xu ◽

W. Cai ◽

Xian-Tong Bi

Keyword(s):

Mechanical Properties ◽

Liquid Crystalline ◽

Diphenyl Ether ◽

Composite Films ◽

Electrically Conductive ◽

Electrochemical Preparation ◽

Conductive Composite ◽

Order Of Magnitude ◽

Conductive Composite Film ◽

Electrically Conductive Composite

ABSTRACTThe modification of the mechanical properties of polypyrrole(PPy) by electrochemical preparation of conductive composite film from pyrrole(Py) and two kinds of liquid crystalline copolyamide of poly(p-phenylene-terephthal- amide)(PPTA) poly(p-phenyleneterephthalamide/diphenyl ether terephthal- amide) (PPTA[0]) and poly(p-phenyleneterephthalamide/diphenyl methane tere-phthalamide) (PPTA[C]) are presented.The electrical conductivity of the PPTA[0]/PPy and PPTA[C]/PPy composites are the same order of magnitude as PPy or PPTA/PPy. The mechanical properties of the composite films are better than that of pure PPy. and the composite films have good electroactivlty and thermalstability.

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Preparation and Characterization of Chitosan/poly( Vinyl Alcohol) Composite Packaging Films

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.332-334.1739 ◽

2011 ◽

Vol 332-334 ◽

pp. 1739-1742 ◽

Cited By ~ 1

Author(s):

Ling Li ◽

Zheng Wei Jin ◽

Jian Qing Wang

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Water Vapor ◽

Vinyl Alcohol ◽

Permeability Coefficient ◽

Composite Films ◽

Weight Ratio ◽

Poly Vinyl Alcohol ◽

Elongation At Break ◽

Packaging Films

A novel chitosan/poly(vinyl alcohol) composite packaging films were prepared by the casting method, and the effects of chitosan concentration on the structures, mechanical properties, permeability for oxygen and water vapor were discussed in this study. Mechanical properties of these films, which were evaluated by the tensile test and the barrier properties showed that the elongation at break (E) of the composite films decreased rapidly with the addition of chitosan, whereas, the tensile strength (TS) presented an almost opposite trend. Both the water vapour and oxygen transmission rate values were increased with the increasing amount of the chitosan in the composite films. Based on the obtained results, the better property of the composites films would be prepared chitosan/poly(vinyl alcohol) blends at a weight ratio of 3/5, and the tensile strength and elongation at break of the packaging films were 34.12 MPa, 40.24 % respectively. It was also observed that the water vapor permeability coefficient (Pv) and the oxygen permeability coefficient (P) of chitosan/poly(vinyl alcohol) composite packaging films prepared with weight ratio of 3/5 were 1.99×10-15 g•cm/cm2•s•Pa and 7.98×10-16 cm3•cm/cm2•s•Pa respectively. The composite films in this paper can be used in fresh-keeping or other fields as a kind of green packaging material.

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The Effects of Coupling Agents on the Properties of Polyimide/Nano-Al2O3Three-Layer Hybrid Films

Journal of Nanomaterials ◽

10.1155/2010/354364 ◽

2010 ◽

Vol 2010 ◽

pp. 1-5 ◽

Cited By ~ 4

Author(s):

Lizhu Liu ◽

Ling Weng ◽

Yuxia Song ◽

Lin Gao ◽

Qingquan Lei

Keyword(s):

Mechanical Properties ◽

Thermal Stability ◽

Tensile Strength ◽

Composite Film ◽

Breakdown Strength ◽

Composite Films ◽

Coupling Agents ◽

Hybrid Films ◽

Mechanical Method ◽

Elongation At Break

PI/nano-Al2O3hybrid films were prepared by ultrasonic-mechanical method. Before addition, nano-Al2O3particles were firstly modified with different coupling agents. The micromorphology, thermal stability, mechanical properties, and electric breakdown strength of hybrid films were characterized and investigated. Results indicated that nano-Al2O3particles were homogeneously dispersed in the PI matrix by the addition of coupling agents. The thermal stability and mechanical properties of PI/nano-Al2O3composite films with KH550 were the best. The tensile strength and elongation at break of PI composite film were 119.1 MPa and 19.1%, which were 14.2% and 78.5% higher than unmodified PI composite film, respectively.

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Hot Water Extraction of Corncob Hemicelluloses to Prepare Composite Films

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.989-994.412 ◽

2014 ◽

Vol 989-994 ◽

pp. 412-415

Author(s):

Qing Xue Yu ◽

Guang Yu ◽

Yue Dong Zhang ◽

Ye Fei Liu ◽

Hai Song Wang ◽

...

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Phase Separation ◽

Cross Section ◽

Composite Films ◽

Thermal Characteristics ◽

Hot Water ◽

Hot Water Extraction ◽

Elongation At Break ◽

Continuous Surface

In this study, corncob hemicelluloses were extracted by hot water to investigate its potential for film production. Extracted hemicelluloses were mixed with PVA 30 wt%, the prepared films had a smooth、uniform and continuous surface and dense cross section without the phase separation, as characterized by SEM. Besides, the mechanical properties and thermal characteristics tests showed that the films had a tensile strength of 4.6 MPa, elongation at break of 6.4%, and a nice thermally stability.

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Nanoarchitectonics Composites of Thermoplastic Starch and Montmorillonite Modified with Low Molecular Weight Polylactic Acid

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2020.17457 ◽

2020 ◽

Vol 20 (5) ◽

pp. 2955-2963

Author(s):

Peixian Li ◽

Huimin Guo ◽

Kaixiong Yang ◽

Xiaoyan Yu ◽

Xiongwei Qu ◽

...

Keyword(s):

Mechanical Properties ◽

Molecular Weight ◽

Tensile Strength ◽

Polylactic Acid ◽

Composite Films ◽

Thermoplastic Starch ◽

Nanocomposite Films ◽

Low Molecular Weight ◽

Elongation At Break ◽

Starch Films

Nano montmorillonite (MMT) was modified by low molecular weight polylactic acid (PLA), then, the PLA modified MMT and raw MMT were added into thermoplastic starch (TPS) to prepare biodegradable nanocomposite films, respectively. For both nanocomposite films with raw MMT and modified MMT, the Tmax of degradation was enhanced and the mechanical properties were improved. The composite films containing 4 wt.% MMT displayed tensile strength of 5.06 MPa, approximately 1.4 times of that for the pure TPS films. The tensile strength of composite films containing 4 wt.% modified MMT is 6.74 MPa approximately 2 times of those for pure starch films. On the other hand, the composite film containing 4 wt.% modified MMT displayed elongation at break as high as 34.25%, which is 1.3 times of that of the pure starch film, while the composite films containing raw MMT had reduced elongation at break. This study showed that the MMT modified with PLA could significantly enhance the mechanical properties of TPS, and provides a new method to prepare fully biodegradable starch-based nanocomposites.

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The Structure and Mechanical Properties of Hemp Fibers-Reinforced Poly(ε-Caprolactone) Composites Modified by Electron Beam Irradiation

Applied Sciences ◽

10.3390/app11125317 ◽

2021 ◽

Vol 11 (12) ◽

pp. 5317

Author(s):

Rafał Malinowski ◽

Aneta Raszkowska-Kaczor ◽

Krzysztof Moraczewski ◽

Wojciech Głuszewski ◽

Volodymyr Krasinskyi ◽

...

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Electron Beam ◽

Impact Strength ◽

Flexural Modulus ◽

Natural Fibers ◽

High Energy ◽

Electron Radiation ◽

Elongation At Break ◽

Hemp Fibers

The need for the development of new biodegradable materials and modification of the properties the current ones possess has essentially increased in recent years. The aim of this study was the comparison of changes occurring in poly(ε-caprolactone) (PCL) due to its modification by high-energy electron beam derived from a linear electron accelerator, as well as the addition of natural fibers in the form of cut hemp fibers. Changes to the fibers structure in the obtained composites and the geometrical surface structure of sample fractures with the use of scanning electron microscopy were investigated. Moreover, the mechanical properties were examined, including tensile strength, elongation at break, flexural modulus and impact strength of the modified PCL. It was found that PCL, modified with hemp fibers and/or electron radiation, exhibited enhanced flexural modulus but the elongation at break and impact strength decreased. Depending on the electron radiation dose and the hemp fibers content, tensile strength decreased or increased. It was also found that hemp fibers caused greater changes to the mechanical properties of PCL than electron radiation. The prepared composites exhibited uniform distribution of the dispersed phase in the polymer matrix and adequate adhesion at the interface between the two components.

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Effect of Moisture Content on the Processing and Mechanical Properties of a Biodegradable Polyester

Polymers ◽

10.3390/polym13101616 ◽

2021 ◽

Vol 13 (10) ◽

pp. 1616

Author(s):

Vincenzo Titone ◽

Antonio Correnti ◽

Francesco Paolo La Mantia

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Moisture Content ◽

Mechanical Testing ◽

Hydrolytic Degradation ◽

Slight Reduction ◽

Biodegradable Polyester ◽

Molding Process ◽

Elongation At Break ◽

Effect Of Moisture

This work is focused on the influence of moisture content on the processing and mechanical properties of a biodegradable polyester used for applications in injection molding. The pellets of the biodegradable polyester were exposed under different relative humidity conditions at a constant temperature before being compression molded. The compression-molded specimens were again placed under the above conditions before the mechanical testing. With all these samples, it is possible to determine the effect of moisture content on the processing and mechanical properties separately, as well as the combined effect of moisture content on the mechanical properties. The results obtained showed that the amount of absorbed water—both before processing and before mechanical testing—causes an increase in elongation at break and a slight reduction of the elastic modulus and tensile strength. These changes have been associated with possible hydrolytic degradation during the compression molding process and, in particular, with the plasticizing action of the moisture absorbed by the specimens.

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