scholarly journals Effect of Copper (II) Sulfate on the Properties of Urea Formaldehyde Adhesive

Polymers ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 94
Author(s):  
Hui Zhao ◽  
Xianzhen Li ◽  
Xi Wang ◽  
Mianwu Meng ◽  
Xiujian Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Urea Formaldehyde ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Sulfate Content ◽  
Formaldehyde Release ◽  
Uf Resin ◽  
Effect Of Copper ◽  
Physical And Chemical ◽  
And Chemical Properties

The purpose of this work is to investigate the effects of copper (II) sulfate on formaldehyde release and the mechanical properties of urea formaldehyde (UF) adhesive. Copper (II) sulfate has been used as a formaldehyde scavenger in UF resin, and its effects on the physical and chemical properties of UF adhesive have been studied. Moreover, the mechanical properties and formaldehyde release of plywood prepared with modified UF resin have been determined. The UF resin has been characterized by Fourier-transform infrared (FTIR) spectroscopy and thermogravimetric analysis (TGA). FTIR spectra showed that the addition of copper (II) sulfate to the UF resin did not affect the infrared (IR) absorptions of its functional groups, implying that the structure of UF was not modified. Further results showed that: the free formaldehyde content of the UF resin by the incorporation of 3% copper (II) sulfate was 0.13 wt.%, around 71% lower than that of the control UF adhesive. With a copper (II) sulfate content of 3%, the formaldehyde release from treated plywood was 0.74 mg·L−1, around 50% lower than that from the control UF adhesive, and the bonding strength reached 1.73 MPa, around 43% higher than that of the control UF adhesive.

Study of Whiskers to be Used in Composite Materials

2021 ◽  
Vol 316 ◽  
pp. 51-55
Author(s):  
Tamara I. Shishelova ◽  
Vadim V. Fedchishin ◽  
Mikhail A. Khramovskih
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Chemical Properties ◽  
High Strength ◽  
Rapid Expansion ◽  
Physical And Chemical Properties ◽  
Reinforcement Fiber ◽  
Object Of Study ◽  
Physical And Chemical ◽  
And Chemical Properties

Rapid expansion of technologies poses higher requirements to structural materials and items made of them. Conventional materials are being replaced by composite materials (composites). Different additives enhancing the properties of initial materials are used as reinforcement fibers of composites. Utilization of micro-and nanosize particles for production of present-day materials is paid much attention to. Whiskers are among such materials. These crystals have high strength, high chemical and temperature resistance. But for rational utilization of whickers of different chemical composition in composite materials one should know their physical and chemical properties. Objectives of the paper: to study physical and chemical properties of whiskers in different compounds, their composition and structure; to prove experimentally the feasibility of utilizing whiskers as a reinforcement fiber of composite materials. Object of study: specimens of whiskers of silicon nitride (Si3N4), aluminum oxide (Al2O3), aluminum nitride (AlN), and mullite (Al6Si2O13). Methods of investigation: thermal study of specimens, study of mechanical properties and chemical strength, and IR-spectroscopy. Results of study: specimens of whiskers have been studied and their mechanical properties have been tabulated for comparison. Extensive thermal investigation was followed by deduction of regularities and identification of chemical properties of whiskers. IR-spectra of whiskers have been studied and conclusions on molecular composition and on presence of impurities in some whiskers have been made.

scholarly journals Biocompatible Material from Indonesian Natural Resource of Wild Silkmoth Cocoon

2018 ◽  
Vol 1 (2) ◽  
pp. 47
Author(s):  
Tjokorda Gde Tirta Nindhia ◽  
Zdenek Knejzlík ◽  
Tomáš Ruml ◽  
I Wayan Surata ◽  
Tjokorda Sari Nindhia
Keyword(s):  
Mechanical Properties ◽  
Natural Resource ◽  
Chemical Properties ◽  
Hot Water ◽  
Physical And Chemical Properties ◽  
Living Things ◽  
Biocompatibility Testing ◽  
Good Biocompatibility ◽  
Physical And Chemical ◽  
And Chemical Properties

Silk can be produced by spider or insect and have prospect as biomaterial for regenerative healing in medical treatment. Silk having physical and chemical properties that support biocompatibility in the living things..In this research, silk that was obtained from Indonesia natural resource of Attacus atlas silkmoth was explored and then will be  developed for biocompatible biomaterial. The treatment with NaOH was developed to separate the fiber from the cocoon. The obtained fiber is investigated its mechanical property by performing tensile test for single fiber. The biocompatibility testing was conducted with human cell (osteosarccoma) cultivation. The result identify that separation by using NaOH yield better better mechanical properties comparing konvenstional method with boiling in hot water. Biocompatibility testing indicate that the the fiber having good biocompatibility.

Influence of Fluidized Fly Ash on the Selected Physical-Mechanical Properties of the Autoclaved Aerated Concrete

2014 ◽  
Vol 899 ◽  
pp. 409-414 ◽  
Author(s):  
Alena Struhárová ◽  
Stanislav Unčík ◽  
Svetozár Balkovic ◽  
Mária Hlavinková
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Amorphous Phases ◽  
Autoclaved Aerated Concrete ◽  
Aerated Concrete ◽  
Free Cao ◽  
Physical And Chemical ◽  
And Chemical Properties

Fluidized fly ash has different physical and chemical properties compared to fly ash emerging from classic combustion. It contains amorphous phases resulting from a dehydration of clay minerals as well as unreacted sorbent of CaCO3, free CaO and anhydrite (CaSO4). Work targets the possibilities of production of an autoclaved aerated concrete (AAC) from fluidized fly ash, and its influence on particular physical-mechanical properties of autoclaved aerated concrete.

Untersuchungen zum Einfluss der thermischen Vorbehandlung auf das Sorptionsverhalten und ausgewählte mechanische Eigenschaften von Fichtenholz | Examinations of the influence of thermal treatment on certain mechanical properties of spruce (reviewed paper)

2005 ◽  
Vol 156 (2) ◽  
pp. 47-51 ◽  
Author(s):  
Fritz Bächle ◽  
Peter Niemz
Keyword(s):  
Mechanical Properties ◽  
Thermal Treatment ◽  
Chemical Properties ◽  
Thermal Treatments ◽  
Physical And Chemical Properties ◽  
Mechanische Eigenschaften ◽  
Physical And Chemical ◽  
And Chemical Properties

A range of mechanical, physical and chemical properties were tested on spruce, which had been subjected to diverse thermal treatments. The results of the examination are presented in tables and graphic figures.

scholarly journals Defect-sensitive performance of silicene sheets under uniaxial tension: mechanical properties, electronic structures and failure behavior

RSC Advances ◽  
2017 ◽  
Vol 7 (17) ◽  
pp. 10306-10315 ◽  
Author(s):  
Ning Ding ◽  
Huan Wang ◽  
Xiangfeng Chen ◽  
Chi-Man Lawrence Wu
Keyword(s):  
Mechanical Properties ◽  
Uniaxial Tension ◽  
Electronic Structures ◽  
Chemical Properties ◽  
Failure Behavior ◽  
Physical And Chemical Properties ◽  
Physical And Chemical ◽  
Silicon Analog ◽  
And Chemical Properties

As a silicon analog of graphene, silicene has attracted considerable attention due to its unique physical and chemical properties.

scholarly journals Mechanical properties of plasma polymer films: a review

2021 ◽  
Vol 3 (6) ◽  
Author(s):  
Jamerson Carneiro de Oliveira ◽  
Aissam Airoudj ◽  
Philippe Kunemann ◽  
Florence Bally-Le Gall ◽  
Vincent Roucoules
Keyword(s):  
Mechanical Properties ◽  
Polymer Films ◽  
Chemical Properties ◽  
Plasma Polymer ◽  
List Type ◽  
Physical And Chemical Properties ◽  
Plasma Polymers ◽  
Physical And Chemical ◽  
And Chemical Properties

Abstract Plasma polymers are micro-, or more commonly, nano-sized coatings that can be deposited on a variety of substrates through different approaches. The versatility of these polymers is incremented by the possibility to use other precursors than conventional polymerization reactions and by potential changes in the polymerization mechanisms according to the intrinsic physical and chemical properties of the plasma. That flexibility offers a fruitful ground to a great range of scientific and engineering fields, but it also brings many challenges for universalization of empirical observations. In this review, the use of different precursors, substrates and changes in plasma external parameters were evaluated as common, but not necessarily ideal nor exhaustive, variables for the analysis of mechanical properties of plasma polymer films. The commonly reported trends are complemented with the exceptions, and a variety of hypothesis drawn by the empirical observations are shown. The techniques and methods used for determining the mechanical properties of plasma polymers, the effect of post-treatments on them and some applications are evaluated. Finally, a general conclusion highlighting the challenges of the field is provided. Article highlights The mechanical properties of plasma polymers are evaluated as a function of selected parameters. The techniques of characterization of mechanical properties of plasma polymers are summarized. A discussion of future and current demands for the analysis of mechanical properties of plasma polymers is done.

scholarly journals Rubber Material Properties of Several Rubber Tree Strains

2019 ◽  
Vol 136 ◽  
pp. 03001
Author(s):  
Wang Kaidian ◽  
Han Quanhui ◽  
Lu qingzhi ◽  
Chen Zhanxiong ◽  
Li Jianhui ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Rubber Tree ◽  
Chemical Properties ◽  
Physical And Mechanical Properties ◽  
Physical And Chemical Properties ◽  
Rubber Material ◽  
Vulcanized Rubber ◽  
Processing Properties ◽  
Physical And Chemical ◽  
And Chemical Properties

：The rubber from rubber tree strain reyan 8-79 (hainan), zhanshi 218-6 (guangdong), yunyan 73-46 and yunyan 75-11 (yunnan) were tested to determine the physical and chemical properties, processing properties of raw rubber and physical and mechanical properties of vulcanized rubber. The results showed that raw rubber from different tree strains had different physical and chemical properties, processing properties,andthe physical and mechanical properties of vulcanized rubber were different as well. Yunyan 75-11 had the highest mooney viscosity, Reyan 8-79 had the highest protein content, Zhanshi 218-6 had the best tensile and tearing strength, Yunyan 73-46 had small elastic modulus, large loss factor and good processing properties.

scholarly journals Physical and Mechanical Properties of Rural-Road Pavement Concrete in South Korea Containing Air-Cooled Blast-Furnace Slag Aggregates

2021 ◽  
Vol 11 (12) ◽  
pp. 5645
Author(s):  
Byung-Hwan Ahn ◽  
Su-Jin Lee ◽  
Chan-Gi Park
Keyword(s):  
Mechanical Properties ◽  
Chemical Properties ◽  
Physical And Mechanical Properties ◽  
Physical And Chemical Properties ◽  
Air Content ◽  
Road Pavement ◽  
Performance Requirements ◽  
Rural Road ◽  
Physical And Chemical ◽  
And Chemical Properties

The purpose of this study was to assess the physical and mechanical properties of pavement concrete for rural roads of South Korea made with air-cooled slag aggregate, which is an industrial byproduct. This study assessed the physical and chemical properties according to the following performance requirements based on the design criteria of the Korea Ministry of Agriculture’s Agricultural Production Infrastructure Maintenance Business Plan and the Korea Expressway Corporation’s Highway Construction Specialized Specifications: slump of 80 mm or greater, air content of 4.5 ± 1.5%, compressive strength of at least 21 MPa, splitting tensile strength of at least 4.2 MPa, and a chloride penetration resistance of less than 4000 C. The slump, air content, compressive strength, splitting tensile strength, flexural strength, and chloride ion permeability of the aggregate-containing concretes were measured. The air-cooled slag aggregates provided the necessary physical and chemical properties and presented no environmental issues. Furthermore, the slump and air content of concrete made with the aggregates met the target values. The slump decreased and the air content increased with increasing amounts of air-cooled slag aggregate. Mechanical testing of the concretes containing air-cooled slag aggregate established that they met the performance requirements for rural road pavement.

Studies on Influence of Tantalum Addition in TP310HCbN

2016 ◽  
Author(s):  
Kazuki Furuya ◽  
Mamoru Nagao ◽  
Takeo Miyamura ◽  
Shigenobu Nanba
Keyword(s):  
Mechanical Properties ◽  
Creep Strength ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Creep Properties ◽  
Physical And Chemical ◽  
And Chemical Properties

SA-213/SA-213M TP310HCbN (UNS S31042) has excellent creep properties. The superior creep strength of this alloy is achieved by precipitation of fine niobium based Z-phase. It is well established that niobium and tantalum have similar physical and chemical properties. We evaluated mechanical properties of tantalum added TP310HCbN, to investigate whether tantalum could be substitute for niobium. It is concluded that niobium can be replaced by tantalum in TP310HCbN.

Mechanical Properties of ZrO2–LaMgAl11O19 Ceramics

2012 ◽  
Vol 512-515 ◽  
pp. 455-458 ◽  
Author(s):  
Xin Min ◽  
Ming Hao Fang ◽  
Yan Gai Liu ◽  
Zhao Hui Huang ◽  
Feng Jiao Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Room Temperature ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Transformation Toughening ◽  
Flexure Strength ◽  
Phase Transformation Toughening ◽  
Physical And Chemical ◽  
And Chemical Properties

ZrO2 ceramics have been widely used to many fields with its excellent physical and chemical properties, but the mechanical properties of YSZ ceramics, especially the fracture toughness, decline caused by the failure of the phase transformation toughening at high temperature. In this investigation, plate-like LaMgAl11O19 toughened ZrO2 ceramics were prepared by pressureless sintering at 1550 °C for 3h in air . The bulk density of the sintered samples are between 5.5 to 6.0 g/cm3, and the relative density are above 93%. The mechanical properties of the ZrO2-LaMgAl11O19 ceramics were studied systematically at room temperature. The flexure strength and fracture toughness of ZrO2-LaMgAl11O19 ceramic are 811.8 MPa and 13.9 MPa•m½ with the LMA addition of 2wt%.

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