scholarly journals Radiation and thermal effects upon mechanics of polymer composites

2020 ◽  
Vol 4 (394) ◽  
pp. 89-98
Author(s):  
Sergei I. Emelyanov ◽  
Nikolay L. Kuchin ◽  
Boris A. Yartsev ◽  
Vladimir L. Lebedev
Keyword(s):  
Mechanical Properties ◽  
Polymer Composites ◽  
Radiation Effects ◽  
Nuclear Reactions ◽  
Extreme Temperature ◽  
Physical And Mechanical Properties ◽  
Computational Prediction ◽  
Effect Of Temperature ◽  
Dynamic Methods ◽  
Structural Applications

Object and purpose of research. This paper discusses polymeric composites of various structural applications that may be exposed to extreme temperature and/or radiation, with possible implications for their physical and mechanical properties. Materials and methods. We used static and dynamic methods for determining the constants characterizing the mechanical properties of polymer composites. The analysis of numerous nuclear reactions occurring during neutron irradiation of a polymer composite with a certain chemical composition was carried out by the method of computational prediction. The results of this analysis confirm the change in the composition of the composite and the possibility of changing its internal structure. Main results. Suitability of the investigated composites for the applications accompanied by high-temperature and radiation effects, like foundations of marine nuclear reactors, has been confirmed. Conclusion. For the considered range of temperature and radiation effects, the effect of temperature on structural performance of a composite determined, in its turn, by the mechanical properties of its matrix, is the most significant, while radiation exposure turned out to be less important. Developing polymer composites for more intense radiation environments, like neutron fluxes or gamma rays, it is advisable to optimize their chemistry so as to reduce or totally eliminate the elements capable of generating long-lived radionuclides.

scholarly journals In Polymerization of Environment Friendly Melamine-Urea-Glyoxal Resin in Rubber Wood for Improved Physical and Mechanical Properties

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Lijuan Ping ◽  
Yubo Chai ◽  
Fangwen Zhang ◽  
Bailing Sun ◽  
Junliang Liu
Keyword(s):  
Mechanical Properties ◽  
Wood Sample ◽  
Treated Wood ◽  
Physical And Mechanical Properties ◽  
Weight Percent Gain ◽  
Wood Products ◽  
Environment Friendly ◽  
Promising Alternative ◽  
Rubber Wood ◽  
Structural Applications

In the study, we report that a safe and simple way for upgrading inferior rubber wood through the combined modification of environment-friendly MUG resin was synthesized from glyoxal, melamine, urea, and other additives. MUG-treated wood samples were prepared with six different MUG resin concentrations (5, 15, 25, 35, 45, and 55 wt %) into the wood matrix and then heated and polymerized to form a solid and hydrophobic MUG resin in the wood scaffold, and the physico-mechanical properties were evaluated. As the MUG resin concentration increased, the weight percent gain and density increased, water uptake and leachability decreased, and the antiswelling efficiency increased at first and then decreased. MUG-treated wood sample can be prepared when the MUG resin concentration was set as 25%, and the physical properties of treated wood was optimum. Scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy analysis showed that the MUG resin is widely distributed in the cell lumens and cell walls. With enhanced physico-mechanical properties, MUG-treated wood sample can be well used as a promising alternative to existing engineered wood products for structural applications.

scholarly journals Effect of Temperature and Sisal Fiber Content on the Properties of Plaster of Paris

2018 ◽  
Vol 7 (4.20) ◽  
pp. 205 ◽  
Author(s):  
Aqil M. ALmusawi ◽  
Thulfiqar S. Hussein ◽  
Muhaned A. Shallal
Keyword(s):  
Mechanical Properties ◽  
Elevated Temperatures ◽  
Physical And Mechanical Properties ◽  
Fiber Content ◽  
Sisal Fiber ◽  
Effect Of Temperature ◽  
Plaster Of Paris ◽  
Micro Cracks ◽  
Recent Developments ◽  
Negative Effect

Recent developments in the production of ecologically friendly building composites have led to a renewed interest in the use of vegetable fibers as a reinforcement element. Traditional pure Plaster of Paris (POP) can suffer from the development of micro-cracks due to thermal expansion. Therefore, sisal fiber was studied for its potential as an ecological element to restrict and delay the development of micro-cracks in POP. Different sisal proportions of 0, 2, 4, 6, 8 and 10 wt. % of POP were used to characterize the physical and mechanical properties of POP at the ambient temperature. Then, the effects of temperatures of 25, 100, 200, 300, 400 and 500  were investigated. Results proved that the composite of 10% sisal fiber had the best mechanical properties. Also, when the fiber content was increased, the composite’s performance was enhanced, becoming better able to resist elevated temperatures. However, raising the temperature to 300 or above had a negative effect on the mechanical properties, which were significantly decreased due to the degradation of the sisal fiber. 

Study on the Mechanism of Woven Cotton Fabric during Steam Ironing

2015 ◽  
Vol 671 ◽  
pp. 179-185 ◽  
Author(s):  
Fan Wu ◽  
Shuai Tong Liang ◽  
Xue Mei Ding
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Physical And Mechanical Properties ◽  
Cotton Fabrics ◽  
Temperature Treatment ◽  
Woven Fabrics ◽  
Effect Of Temperature ◽  
High Temperature Treatment ◽  
Recovery Rates ◽  
Basic Parameters

Cotton fabrics are very popular textile products to consumers due to their soft hand and comfortable wearing performance. However, the severe wrinkles on cotton fabrics will frequently happen after washing or wearing. As the growth of the market and demand of consumers, the sales of the steam ironing machine which can remove wrinkles to some extent is getting better. At present, the research is inadequate on the wrinkling mechanism during steam ironing. Therefore, in this paper, we aimed to investigate how cotton woven fabrics’ performance influences on the smoothness appearance after steam ironing. To further analyze wrinkling mechanism, fabrics’ wrinkle recovery rates which comprehensive characterize the physical and mechanical properties were tested with PhabrOmeter, including wrinkle recovery rates at normal temperature and after high temperature treatment. Then, the effect of temperature to fabrics’ wrinkle recovery rates and its relationship with fabrics’ smoothness appearance after ironing were studied. The results indicate that there are no significant correlations between the fabric basic parameters with smoothness appearance after ironing. The effect of temperature during ironing can improve the wrinkle recovery rates about 6%-21%. And no significant correlation is showed between smoothness appearance after ironing and wrinkle recovery rates. Keywords: Steam Ironing; mechanism; fabric parameters; wrinkle recovery rate.

Studies of Mechanical Properties of Multiwall Nanotube Based Polymer Composites

2014 ◽  
Vol 5 (3) ◽  
Author(s):  
A. K. Gupta ◽  
S. P. Harsha
Keyword(s):  
Mechanical Properties ◽  
Polymer Composites ◽  
Composite Structures ◽  
Secondary Reinforcement ◽  
Chemical Vapor ◽  
Carbon Composite ◽  
Diglycidyl Ether ◽  
Two Phase ◽  
Three Phase ◽  
Structural Applications

The two phase polymer composites have been extensively used in various structural applications; however, there is need to further enhance the strength and stiffness of these polymer composites. Carbon nanotubes (CNTs) can be effectively used as secondary reinforcement material in polymer based composites due to their superlative mechanical properties. In this paper, effects of multiwall nanotubes (MWNTs) reinforcement on epoxy–carbon polymer composites are investigated using experiments. MWNTs synthesized by chemical vapor deposition (CVD) technique and amino-functionalization are achieved through acid-thionyl chloride route. Diglycidyl ether of bisphenol-A (DGEBA) epoxy resin with diethyl toluene diamine (DETDA) hardener has been used as matrix. T-300 carbon fabric is used as the primary reinforcement. Three types of test specimen of epoxy–carbon composite are prepared with MWNT reinforcement as 0%, 1%, and 2% MWNT (by weight). The resultant three phase nanocomposites are subjected to tensile test. It has been found that both tensile strength and strain at failure are substantially enhanced with the small addition of MWNT. The analytical results obtained from rule of mixture theory (ROM) shows good agreement with the experimental results. The proposed three phase polymer nanocomposites can find applications in composite structures, ballistic missiles, unmanned arial vehicles, helicopters, and aircrafts.

Tensile properties prediction of natural fibre composites using rule of mixtures: A review

2018 ◽  
Vol 38 (5) ◽  
pp. 211-248 ◽  
Author(s):  
Mun Wai Tham ◽  
MR Nurul Fazita ◽  
HPS Abdul Khalil ◽  
Nurul Zuhairah Mahmud Zuhudi ◽  
Mariatti Jaafar ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Properties ◽  
Polymer Composites ◽  
Mixture Models ◽  
Prediction Accuracy ◽  
Physical And Mechanical Properties ◽  
Natural Fibre ◽  
Natural Fibres ◽  
Fibre Composites ◽  
Experimental Values

Rule of mixture models are usually used in the tensile properties prediction of polymer composites reinforced with synthetic fibres. They are less utilized for natural fibre/polymer composites due to natural fibres physical and mechanical properties variability which reduces rule of mixture model's prediction values accuracy compared to the experimental values. This had led to studies conducted by various researchers to improve the existing rule of mixture models to give a better reflection of the true natural fibres properties and enhance the rule of mixture models prediction accuracy. In this paper, rule of mixture model's utilization includes the existing rule of mixture models as well as proposed rule of mixture models which have one or more factors incorporated into existing rule of mixture models for natural fibre/polymer composites tensile properties prediction are reviewed.

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