scholarly journals Development and Characterization of Chitosan-Nanoclay Composite Films for Enhanced Gas Barrier and Mechanical Properties

2016 ◽  
Vol 2 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Marcos A Neves ◽  
Keyword(s):  
Mechanical Properties ◽  
Composite Films ◽  
Gas Barrier

Enhancing the Thermal and Mechanical Characteristics of Polyvinyl Alcohol (PVA)-Hemp Protein Particles (HPP) Composites

2021 ◽  
Vol 36 (2) ◽  
pp. 137-143
Author(s):  
S. A. Awad
Keyword(s):  
Mechanical Properties ◽  
Elevated Temperatures ◽  
Composite Films ◽  
Tensile Tests ◽  
Mechanical Analysis ◽  
Decomposition Temperature ◽  
Scanning Calorimetry ◽  
Solution Casting Method ◽  
Protein Particles

Abstract This paper aims to describe the thermal, mechanical, and surface properties of a PVA/HPP blend whereby the film was prepared using a solution casting method. The improvements in thermal and mechanical properties of HPP-based PVA composites were investigated. The characterization of pure PVA and PVA composite films included tensile tests, thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC). The results of TGA and DSC indicated that the addition of HPP increased the thermal decomposition temperature of the composites. Mechanical properties are significantly improved in PVA/HPP composites. The thermal stability of the PVA composite increased with the increase of HPP filler content. The tensile strength increased from 15.74 ± 0.72 MPa to 27.54 ± 0.45 MPa and the Young’s modulus increased from 282.51 ± 20.56 MPa to 988.69 ± 42.64 MPa for the 12 wt% HPP doped sample. Dynamic mechanical analysis (DMA) revealed that at elevated temperatures, enhanced mechanical properties because of the presence of HPP was even more noticeable. Morphological observations displayed no signs of agglomeration of HPP fillers even in composites with high HPP loading.

Preparation and characterization of STRG/PI composite films with optimized dielectric and mechanical properties

Polymer ◽  
2015 ◽  
Vol 65 ◽  
pp. 262-269 ◽  
Author(s):  
Pengtu Zhang ◽  
Jianjie He ◽  
Zhong-Kai Cui ◽  
Xinxin Li ◽  
Xiaoyun Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Composite Films ◽  
Dielectric And Mechanical Properties

scholarly journals Design of Novel PLA/OMMT Films with Improved Gas Barrier and Mechanical Properties by Intercalating OMMT Interlayer with High Gas Barrier Polymers

Polymers ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 3962
Author(s):  
Abdul Shakoor Shar ◽  
Caili Zhang ◽  
Xieqing Song ◽  
Yunxuan Weng ◽  
Qiuyue Du
Keyword(s):  
Mechanical Properties ◽  
Vinyl Alcohol ◽  
Composite Films ◽  
Barrier Properties ◽  
Poly Vinyl Alcohol ◽  
Diffraction Measurement ◽  
Scanning Calorimetry ◽  
Gas Barrier ◽  
Ethylene Vinyl Alcohol ◽  
Barrier Polymers

Polymer/clay composites are an innovative class of materials. In this study, we present a facile method for the preparation of biodegradable and robust PLA/organomodified montmorillonite (OMMT) composite films with excellent gas barrier performance. When the design of PLA/OMMT composite films, in addition to making OMMT have good intercalation effect in the matrix, the compatibility of intercalating polymer and matrix should also be considered. In this work, two polymers with high gas barrier properties, namely poly(vinyl alcohol) (PVA) and ethylene vinyl alcohol copolymer (EVOH), were selected to intercalate OMMT. The morphology and microstructures of the prepared PLA/PVA/OMMT and PLA/EVOH/OMMT composites were characterized by the X-ray diffraction measurement, scanning electron microscopy, and differential scanning calorimetry. It was shown that the good dispersibility of PVA in the PLA matrix, rather than the intercalation effect, was responsible for the improved gas barrier and mechanical properties of PLA/PVA/OMMT composite. The elongation at break increases from 4.5% to 22.7% when 1 wt % PVA is added to PLA/OMMT. Moreover, gas barrier of PLA/PVA1/OMMT measured as O2 permeability is 52.8% higher than that of neat PLA. This work provides a route to intercalate OMMT interlayer with high gas barrier polymers and thus can be a useful reference to fabricate PLA/OMMT composites with improved gas barrier and mechanical properties. A comparison of oxygen permeabilities with existing commercial packaging films indicates that the biodegradable PLA/PVA/OMMT may serve as a viable substitute for packaging film applications.

scholarly journals Flexible and High Thermal Conductivity Composites Based on Graphite Nanoplates Paper Impregnated with Polydimethylsiloxane

2021 ◽  
Vol 5 (12) ◽  
pp. 309
Author(s):  
Daniele Battegazzore ◽  
Erica Fadda ◽  
Alberto Fina
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Deposition Time ◽  
Electronic Devices ◽  
Composite Films ◽  
Thermal And Mechanical Properties ◽  
Wide Range ◽  
High Flexibility ◽  
Highly Porous

This paper deals with the design, preparation, and characterization of conductive and flexible nanopapers based on graphite nanoplates (GNP) and polydimethylsiloxane (PDMS). Highly porous GNP nanopapers were first prepared by filtration from a GNP suspension in a solvent. Subsequently, PDMS impregnation was carried out to obtain a composite material. By varying the concentration of the polymer solution and the deposition time, PDMS/GNP nanopapers were produced with a wide range of PDMS contents, porosities, and densities. Thermal diffusivity of the composite films (both in-plane and cross-plane) were measured and correlated with the structure of the nanopapers. Selected formulations were investigated in detail for their physical, thermal, and mechanical properties, exhibiting high flexibility and resistance to more than 50 repeated bendings, stiffness of up to 1.3 MPa, and thermal conductivity of up to 25 W/m∙K. Based on the properties obtained, the materials presented in this paper may find applications in modern lightweight and flexible electronic devices.

scholarly journals Synthesis and characterization of the starch/silicone composite and elaboration of its films

2021 ◽  
Author(s):  
Coyolicaltzin Peralta-González ◽  
Aurelio Ramirez-Hernandez ◽  
Gustavo Rangel-Porras ◽  
Alejandro Aparicio-Saguilán ◽  
Andrés Aguirre-Cruz ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Composite Films ◽  
Sem Analysis ◽  
Synthesis And Characterization ◽  
Starch Granules ◽  
Mass Ratio ◽  
Synthesis Conditions ◽  
Packaging Industry ◽  
Potential Use

Abstract Synthesis of the starch/silicone composite carried out and its structural characterization by FTIR, Raman and 29Si NMR allowed to identify functional groups of the composite. The synthesis conditions were a starch/silicone mass ratio of 2.0 and a temperature of 150 oC to obtain a yield of 84.63 %. SEM analysis showed that the starch granules were covered by silicone, this caused a decrease in the crystallinity of starch. Composite films have higher thermal stability compared to native starch. Mechanical properties and electrical conductivity of the starch/silicone composite film increase with respect to starch-only films. While the crystallinity of both films is similar. The results obtained in this work indicate that starch/silicone composites can be an alternative to make films with a potential use for the packaging industry.

scholarly journals Investigations on the Structural and Mechanical Properties of Polyurethane Resins Based on Cu(II)phthalocyanines

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Tamer E. Youssef ◽  
Hamad Al-Turaif ◽  
AbdulAziz A. Wazzan
Keyword(s):  
Mechanical Properties ◽  
Composite Films ◽  
Microstructural Characterization ◽  
Thermomechanical Properties ◽  
Tensile Behavior ◽  
Morphological Properties ◽  
Thermal Tests ◽  
Very High ◽  
Polyurethane Matrix

This work report was reported on the effect of the addition of organic filler, that is, 2(3),9(10),16(17),23(24)-octahydroxycopper(II)phthalocyanine [(OH)8CuPc] (3), on the thermal, tensile, and morphological properties of a polyurethane matrix. The mechanical and dynamic mechanical thermal tests together with microstructural characterization of CuPc/PU composites were performed. The three PU composite films containing up to 1, 15, and 30 wt% of CuPc have different behaviors in terms of their morphological issues, thermal properties, and tensile behavior in comparison with the PU film as the reference material. Very high elongations at break from 910% to 1230%, as well as high tensile strengths, illustrate excellent ultimate tensile properties of the prepared samples. The best mechanical and thermomechanical properties were found for the sample filled with 30 wt% of CuPc.

scholarly journals Preparation and characterization of poly(hydroxybutyrate) and hollow glass microspheres composite films: morphological, thermal, and mechanical properties

2019 ◽  
Vol 8 (1) ◽  
pp. 935-943
Author(s):  
Luis Miguel Araque ◽  
Ana Carolina Lemos de Morais ◽  
Tatianny Soares Alves ◽  
Joyce Batista Azevedo ◽  
Laura Hecker Carvalho ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Composite Films ◽  
Thermal And Mechanical Properties ◽  
Glass Microspheres ◽  
Hollow Glass Microspheres ◽  
Hollow Glass

Preparation and characterization of polydimethylsiloxane-based composite films

2021 ◽  
Vol 63 (11) ◽  
pp. 984-987
Author(s):  
Enver Can Kılıç ◽  
Yavuz Salt
Keyword(s):  
Mechanical Properties ◽  
Composite Films ◽  
Thermal Characteristics ◽  
Tensile Tests ◽  
Composite Polymer ◽  
Scanning Calorimetry ◽  
Pdms Film ◽  
Ft Ir ◽  
Nay Zeolites

Abstract In this study, we aimed to find the characteristic properties of the neat and the composite polydimethylsiloxane (PDMS) films. The composite films were prepared by adding 5 A and NaY zeolites and nano-TiO2 to PDMS polymer matrix. In the preparation of the composite polymer films, the inorganic additives were added by 10 wt.-%. The structural and thermal characteristics of the prepared homogenous PDMS film and composite PDMS films were determined by Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA). The glass transition temperature of the films was found by differential scanning calorimetry (DSC). Finally, the mechanical properties of the films were obtained through tensile tests. The effects of 5 A and NaY zeolites and TiO2 on the neat PDMS films were investigated.

Microstructural and fractographic characterization of B4C-Al cermets tested under dynamic and static loading

1989 ◽  
Vol 47 ◽  
pp. 562-563
Author(s):  
Gyeung Ho Kim ◽  
Mehmet Sarikaya ◽  
D. L. Milius ◽  
I. A. Aksay
Keyword(s):  
Thin Film ◽  
Mechanical Properties ◽  
Fracture Toughness ◽  
Static Loading ◽  
Carbon Deposition ◽  
Full Density ◽  
Unique Combination ◽  
Strong Component ◽  
Reaction Products

Cermets are designed to optimize the mechanical properties of ceramics (hard and strong component) and metals (ductile and tough component) into one system. However, the processing of such systems is a problem in obtaining fully dense composite without deleterious reaction products. In the lightweight (2.65 g/cc) B4C-Al cermet, many of the processing problems have been circumvented. It is now possible to process fully dense B4C-Al cermet with tailored microstructures and achieve unique combination of mechanical properties (fracture strength of over 600 MPa and fracture toughness of 12 MPa-m1/2). In this paper, microstructure and fractography of B4C-Al cermets, tested under dynamic and static loading conditions, are described.The cermet is prepared by infiltration of Al at 1150°C into partially sintered B4C compact under vacuum to full density. Fracture surface replicas were prepared by using cellulose acetate and thin-film carbon deposition. Samples were observed with a Philips 3000 at 100 kV.

Sign in / Sign up

Export Citation Format

Share Document