scholarly journals Effect of Cellulose Nanocrystals from Different Lignocellulosic Residues to Chitosan/Glycerol Films

Polymers ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 658 ◽  
Author(s):  
de Andrade ◽  
Nery ◽  
de Santana e Santana ◽  
Leal ◽  
Rodrigues ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Moisture Content ◽  
Natural Resources ◽  
Wheat Bran ◽  
Diameter Ratio ◽  
Coconut Shell ◽  
Biodegradable Films ◽  
Lignocellulosic Residues ◽  
Corn Husk

Interest in nanocellulose obtained from natural resources has grown, mainly due to the characteristics that these materials provide when incorporated in biodegradable films as an alternative for the improvement of the properties of nanocomposites. The main purpose of this work was to investigate the effect of the incorporation of nanocellulose obtained from different fibers (corncob, corn husk, coconut shell, and wheat bran) into the chitosan/glycerol films. The nanocellulose were obtained through acid hydrolysis. The properties of the different nanobiocomposites were comparatively evaluated, including their barrier and mechanical properties. The nanocrystals obtained for coconut shell (CS), corn husk (CH), and corncob (CC) presented a length / diameter ratio of 40.18, 40.86, and 32.19, respectively. Wheat bran (WB) was not considered an interesting source of nanocrystals, which may be justified due to the low percentage of cellulose. Significant differences were observed in the properties of the films studied. The water activity varied from 0.601 (WB Film) to 0.658 (CH Film) and the moisture content from 15.13 (CS Film) to 20.86 (WB Film). The highest values for tensile strength were presented for CC (11.43 MPa) and CS (11.38 MPa) films, and this propriety was significantly increased by nanocellulose addition. The results showed that the source of the nanocrystal determined the properties of the chitosan/glycerol films.

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

Polymers ◽  
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.

Mechanical, Barrier, Physicochemical, and Heat Seal Properties of Starch Films Filled with Nanoparticles

2013 ◽  
Vol 25 ◽  
pp. 90-100 ◽  
Author(s):  
Abdorreza Mohammadi Nafchi ◽  
Abd Karim Alias
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Moisture Content ◽  
Water Solubility ◽  
Decomposition Temperature ◽  
Casting Method ◽  
Film Properties ◽  
Starch Films ◽  
Seal Strength ◽  
Mechanical Barrier

The effects of nanoparticles (nanoclay and nanosilicon dioxide) on heat sealability, physicochemical, barrier, and mechanical properties of starch films were investigated. Starch films were prepared by casting method with addition of nanoparticles and plasticizers. All film properties were measured under standard conditions. Mechanical properties of all types of films were increased by incorporation of nanoparticles. Mungbean starch films showed 100% increment in tensile strength by incorporation of nanoclay. Moisture content, water solubility, and WVP of all starch films decreased whereas decomposition temperature of the films was increased by incorporation of nanoparticles. All films were heat sealable, but nanoparticles-incorporated films exhibited better heat sealability than did control films. In summary, the type of starch governed the heat sealability but nanoparticles have potential to improve seal strength of starch films as well as other functional properties.

scholarly journals The effect of drying on the mechanical properties and structure of biodegradable films

2018 ◽  
Author(s):  
Gabriela Silveira da Rosa ◽  
Sai Vanga ◽  
Yvan Gariepy ◽  
Vijaya Raghavan
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Convective Drying ◽  
Vacuum Drying ◽  
Drying Rate ◽  
Biodegradable Films ◽  
Film Forming ◽  
Rate Period ◽  
Bovine Gelatin ◽  
Kinetics Of

The aim of this study was to investigate the effect of convective and vacuum drying on properties of biodegradable films. The film-forming solutions were prepared with bovine gelatin and carrageenan. The films solutions were dried in convective and vacuum dryers at temperatures of 40, 50 and 60 oC. The results of convective drying kinetics of biofilms showed a constant drying rate period followed by a falling drying rate period. The results of thickness showed dependence with moisture content present in films.Carrageenan films showed promising results, with high values of tensile strength and elongation for convective drying at 60 oC. Keywords: gelatin; carrageenan; drying; biofilm 

scholarly journals Horse paws as raw material for fur industry

2020 ◽  
Author(s):  
Vera Radnaeva ◽  
Dmitry Shalbuev ◽  
Nikolay Sovetkin ◽  
Khurelsukh Gaanbaatar ◽  
Solongo Khosbayar ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Moisture Content ◽  
Chromium Oxide ◽  
Negative Impact ◽  
New Technology ◽  
Treatment Options ◽  
Raw Material ◽  
Processing Technologies ◽  
Regions Of Russia

Horse skin is used for processing various types of skin. However, paws of horse skin are not used as fur raw material. Usually they are burned or sent to landfills and may cause infectious diseases. It is possible to minimize negative impact on the environment by converting this waste into fur raw material. In cold regions of Russia high fur boots made of cattle and deer paws are very popular. The aim of the research is to study the possibility of using paws of horse skin as raw material for fur industry. Processing of horse paws based on well-known leather and fur processing technologies lead to semi-finished product characterized by increased stiffness and uneven properties on different skin parts. Such semi-finished product was not suitable for high fur boots manufacture. The aim of the research is to work out a new technology and study chemical and physico-mechanical properties. In the work various treatment options for horse paws and their properties are investigated: moisture content, amount of minerals and chromium oxide, pH of the aqueous extract, tensile strength, elongation at a voltage of 10 MPa, and stiffness are determined. The possibility of transferring horse paws from municipal solid waste into fur raw material is shown.

Physicochemical and Mechanical Properties of Rice Bran Protein Hydrolysate-Loaded Films

2020 ◽  
Vol 859 ◽  
pp. 9-14
Author(s):  
Thaniya Wunnakup ◽  
Chaowalit Monton ◽  
Laksana Charoenchai ◽  
Duangdeun Meksuriyen
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Moisture Content ◽  
Young’S Modulus ◽  
Rice Bran ◽  
Young's Modulus ◽  
Protein Hydrolysate ◽  
Homogeneous Mixture ◽  
Elongation At Break ◽  
Rice Bran Protein

The objective of this study was to apply rice bran protein hydrolysates (RBH) as bioactive additives of gelatin/Eudragit® NE 30D film and characterize the physicochemical and mechanical properties of its. The RBH was obtained by extraction with 2% sodium chloride (RBH-NaCl) and 0.1 N sodium hydroxide (RBH-NaOH) followed by digestion with Alcalase®. Then, RBH was incorporated in gelatin/Eudragit® NE 30D film. Effect of RBHs on film thickness, moisture content, pH, Young's modulus, tensile strength and the elongation at break were investigated. The RBH-NaCl enriched film showed non-homogeneous mixture and reduced moisture content, tensile strength and the elongation at break (1.8 – 2 folds). However, the RBH-NaOH enriched film exhibited a few non-homogeneous mixture and the Young's modulus was slightly decreased. The pH value was increased in the range of 6.77 – 6.88. Our results provide insight for the potential to develop RBH containing films as topical products.

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 Influence of a thermal treatment on the tensile strength and equilibrium moisture content of bamboo (Guadua angustifolia Kunth)

BioResources ◽  
2020 ◽  
Vol 15 (2) ◽  
pp. 3103-3111
Author(s):  
Ricardo Acosta ◽  
Jorge A. Montoya ◽  
Goran Schmidt
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Thermal Treatment ◽  
Moisture Content ◽  
Equilibrium Moisture Content ◽  
Physical And Mechanical Properties ◽  
Thermal Treatments ◽  
Lignocellulosic Materials ◽  
Basal Section ◽  
Notable Increase

Thermal treatments applied to lignocellulosic materials were found to induce internal chemical reactions, which modified the physical and mechanical properties and dimensional stability of the material. A 3-year-old basal section of bamboo (Guadua angustifolia Kunth), with no nodes and no skin, was subjected to a thermal treatment at temperatures which ranged from 160 to 200 °C for 1 to 4 h. The tensile stiffness showed a slight increase with temperature and time, while the tensile strength showed a notable increase at 160 °C for 2 h. There was a 5% difference in the equilibrium moisture content at 80% relative humidity between the untreated samples and the 200 °C, 4 h treatment.

scholarly journals Effect of Mechanical Properties On Light Weight Sustainable Concrete With The Use of Waste Coconut Shell As Replacement For Coarse Aggregate

2021 ◽  
Author(s):  
Karthiga Shenbagam Natarajan ◽  
Dhivya Ramalingasekar ◽  
Sushmitha Palanisamy ◽  
Mohanraj Ashokan
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Construction Industry ◽  
Coarse Aggregate ◽  
Research Work ◽  
Coconut Shell ◽  
Natural Material ◽  
Light Weight ◽  
Sustainable Concrete ◽  
Sisal Fibers

Abstract Concrete is one of the most important material that is used in the construction industry all around the world. A larger part of the capacity in concrete is generally employed by the coarse aggregate. Due to the tremendous use of coarse aggregate in the construction industry the material is getting degraded. In order to preserve the natural material, we are in search of an alternate material that can be used in concrete instead of the original one. So in this research work a try has been attempted to study the mechanical behaviour of light weight concrete when we use coarse aggregate as waste coconut shell inside concrete. To improve the strength of concrete we also use the sisal fibers in various proportions ranging between 1% to 5% in accordance to the binder weight. After the mechanical properties tests such as the compression test, spilt tensile strength, flexural test, modulus of elasticity test, impact resistant test were conducted finally it was concluded that there was increment in the compression strength up to 5%, tensile strength was increased to 17% elastic modulus to 7% when the fiber content used was 3%. Thus with the use of these waste materials it was found that the concrete's strength gets increased and it leads to the formation of sustainable concrete thus reducing the pollution in the environment.

Kemungkinan Pemanfaatan Beberapa Jenis Rotan Non Komersial Ditinjau Dari Sifat-Sifat Fisik Mekanik

2020 ◽  
Vol 21 (2) ◽  
pp. 32-36
Author(s):  
Heriad Daud S Alusu ◽  
Eva Nurmarini ◽  
Ita Merni Patulak
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Moisture Content ◽  
Modulus Of Elasticity ◽  
Large Diameter ◽  
Small Diameter ◽  
Basic Properties

This research was conducted to determine the basic properties of rattan which are related to the possibility of its use, which are physical-mechanical properties consisting of moisture content, density, parallel tensile strength and modulus of elasticity. There were 12 species of non-commercial rattan studied, 11 species included in the small diameter rattan category (<18 mm diameter) and 1 species belonging to the large diameter rattan category (> 18 mm diameter), namely Daemonorops korthlasii Blume. Based on the results of the tests carried out, there are three species of non-commercial rattan that have similar or similar basic properties to commercial rattan, namely Calamus conirostris Becc., Korthalsia ferox Becc., and Calamus muricatus Becc.

scholarly journals Characterisation of Physical and Mechanical Properties of Unthinned and Unpruned Plantation-Grown Eucalyptus nitens H.Deane & Maiden Lumber

Forests ◽  
2019 ◽  
Vol 10 (2) ◽  
pp. 194 ◽  
Author(s):  
Mohammad Derikvand ◽  
Nathan Kotlarewski ◽  
Michael Lee ◽  
Hui Jiao ◽  
Gregory Nolan
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Shear Strength ◽  
Moisture Content ◽  
Physical And Mechanical Properties ◽  
Modulus Of Rupture ◽  
Eucalyptus Nitens ◽  
Linear Regression Models ◽  
Bending Modulus ◽  
Small Wood

The use of fast-growing plantation eucalypt (i.e., pulpwood eucalypt) in the construction of high-value structural products has received special attention from the timber industry in Australia and worldwide. There is still, however, a significant lack of knowledge regarding the physical and mechanical properties of the lumber from such plantation resources as they are mainly being managed to produce woodchips. In this study, the physical and mechanical properties of lumber from a 16-year-old pulpwood Eucalyptus nitens H.Deane & Maiden resource from the northeast of Tasmania, Australia was evaluated. The tests were conducted on 318 small wood samples obtained from different logs harvested from the study site. The tested mechanical properties included bending modulus of elasticity (10,377.7 MPa) and modulus of rupture (53 MPa), shear strength parallel (5.5 MPa) and perpendicular to the grain (8.5 MPa), compressive strength parallel (42.8 MPa) and perpendicular to the grain (4.1 MPa), tensile strength perpendicular to the grain (3.4 MPa), impact bending (23.6 J/cm2), cleavage (1.6 kN) and Janka hardness (23.2 MPa). Simple linear regression models were developed using density and moisture content to predict the mechanical properties. The variations in the moisture content after conventional kiln drying within randomly selected samples in each test treatment were not high enough to significantly influence the mechanical properties. A relatively high variation in the density values was observed that showed significant correlations with the changes in the mechanical properties. The presence of knots increased the shear strength both parallel and perpendicular to the grain and significantly decreased the tensile strength of the lumber. The results of this study created a profile of material properties for the pulpwood E. nitens lumber that can be used for numerical modelling of any potential structural product from such a plantation resource.

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