There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

Biocomposites reinforced with natural fibers: 2000–2010

https://cyberleninka.org/article/n/768408.pdf

Mechanical properties of graphene and graphene-based nanocomposites

Natural fibers are getting attention from researchers and academician to utilize in polymer composites due to their ecofriendly nature and sustainability. The aim of this review article is to provide a comprehensive review of the foremost appropriate as well as widely used natural fiber reinforced polymer composites (NFPCs) and their applications. In addition, it presents summary of various surface treatments applied to natural fibers and their effect on NFPCs properties. The properties of NFPCs vary with fiber type and fiber source as well as fiber structure. The effects of various chemical treatments on the mechanical and thermal properties of natural fibers reinforcements thermosetting and thermoplastics composites were studied. A number of drawbacks of NFPCs like higher water absorption, inferior fire resistance, and lower mechanical properties limited its applications. Impacts of chemical treatment on the water absorption, tribology, viscoelastic behavior, relaxation behavior, energy absorption flames retardancy, and biodegradability properties of NFPCs were also highlighted. The applications of NFPCs in automobile and construction industry and other applications are demonstrated. It concluded that chemical treatment of the natural fiber improved adhesion between the fiber surface and the polymer matrix which ultimately enhanced physicomechanical and thermochemical properties of the NFPCs.

/pdf/a-review-on-natural-fiber-reinforced-polymer-composite-and-24eoqfvi7o.pdf

A Review on Natural Fiber Reinforced Polymer Composite and Its Applications

The thermodynamics properties of pure epoxidised natural rubber (ENR-50) and epoxidised natural rubber/N, N-M-Phenylenebismaleimide (ENR-50/HVA-2) compound were measured by differential scanning calorimeter (DSC) at a heat rate 10 K/min and at temperatures ranging from 273.15 to 453.15 K. The equations and values of heat capacity, enthalpy, entropy, Gibbs free energy and internal energy of pure ENR-50 and ENR-50/HVA-2 were found to be functions of temperature. The equations of heat capacity, enthalpy and internal energy of pure ENR-50 and ENR-50/HVA-2 compound behaved as polynomial equations with temperature at different order, while entropy and Gibbs free energy of pure ENR-50 and ENR-50/HVA-2 compound behaved as exponential equations with temperature. The Gibbs free energy for both substances was a negative value for all temperatures ranging from 273.15 to 453.15 K.

Effect of N, N-M-Phenylenebismaleimide on Thermodynamics Properties of Epoxidised Natural Rubber by Using Differential Scanning Calorimeter

Polymeric insulators are increasingly being accepted by the electric utilities worldwide. The tremendous growth in the application 0/ polymeric insulators is due to their substannal advantages compared /0 porcelain and glass insulators. This paper describes the investigation 0/ electrical surface tracking and erosion behavior on the new formulated thermoplastic elastomer (TPE) with different level of alumina trihydrate (ATH) contents. The natural rubber blends with lineal' low-density polyethylene (UDPE) at dijferenr weight ratio ore used as base polymer 0/the TPE materials. Experimental results show that the blends filled with different level 0/ ATH are significantly injl lJences the sur/ace tracking properties. 14THcontent with 50 pph is found to be practically improved the surface tracking and erasion resistance a/the compounds. Scan ning dearon microscope is carried out 10 relate the surface tracking properties with lhe morphological analysis.

Effect of ATH fillers on the surface tracking and erosion resistance of natural rubber-LLDPE blends

https://doi.org/10.1016/j.jcin.2022.01.179

CRT-400.06 Prevalence, Clinical Course and Etiology of Viral Myocarditis in the COVID-19 Era

One of the most successful methods developed for modifying polymer properties is the rubber-toughening process by blending rubbers with plastics. Blends of polypropylene (PP) with elastomers are developed with the objective to overcome the inherent brittleness of PP at low temperatures and to enhance the impact strength at room temperature. In this study, a new impact-modified PP ternary blends based on PP/ natural rubber (NR)/linear low density polyethylene (LLDPE) is developed; the NR content ranged from 0 to 30%. The blends were prepared in a laboratory scale twin screw extruder. After mixing and pelletising, the samples were injection moulded and tested for mechanical properties. Impact, flexural and morphological properties of the blends were studied. An increase in impact strength but a decrease of flexural modulus was observed with increasing NR contents. The partial replacement of PP with LLDPE as the third component in PP/NR/LLDPE ternary blend had enhanced the impact strength with a slight decreased in flexural modulus. From morphologv features, LLDPE addition improves the dispersion or NR, affecting mainly the larger particles.

Effect of LLDPE on impact, flexural and morphological properties PP/NR blend

Hybrid composites prepared by using oil palm empty fruit bunch (EFB) and jute fibres as reinforcement in epoxy matrix by keeping the EFB/jute fibre weight ratio constant at 1:1. In this study, effect of coupling agent on tensile and flexural properties of oil palm empty EFB/jute fibres reinforced epoxy hybrid composites evaluated. Hybrid composites are prepared by using hand lay-up technique. Particular interest is the effect of coupling agent (CA), 2-Hyroxy ethyl acrylate (HEA) on the tensile and flexural properties of hybrid composites. The laminates coupled with HEA showed better tensile and flexural properties than the one without coupling agent. The highest tensile and flexural strength value has been obtained for hybrid composite of jute/EFB/jute (CA). Tensile fracture composite specimens were analyzed by using scanning electron microscopy (SEM) to know the morphological behaviour of composites. Thermal properties of the hybrid composites were investigate to observe the effect of 2-Hyroxy ethyl acrylate (HEA) on thermal stability of hybrid composites.

Azman Hassan

Papers

Effect of N, N-M-Phenylenebismaleimide on Thermodynamics Properties of Epoxidised Natural Rubber by Using Differential Scanning Calorimeter

Effect of ATH fillers on the surface tracking and erosion resistance of natural rubber-LLDPE blends

CRT-400.06 Prevalence, Clinical Course and Etiology of Viral Myocarditis in the COVID-19 Era

Effect of LLDPE on impact, flexural and morphological properties PP/NR blend

Effect of coupling agent on mechanical and thermal behaviour of oil palm/jute hybrid composites