Juniper Publishers Journal of Polymer science

JUNIPER PUBLISHERS- Academic Journal of Polymer Science Opinion Charles Goodyear discovered in 1839 that heating raw rubber with sulfur modified the rubber to retain its shape. Over the years, there has been an increasing trend to use more chemical curatives in rubber compounds. Excessive use of the chemical curatives is harmful to health, safety and the environment and their use is restricted by the new European chemicals policy, Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH) and various legislations for environment and safety [1,2]. Sulfenamide accelerators and zinc oxide (ZnO) are used extensively to cure a wide range of industrial rubber articles. However, these chemicals cause eye, skin and respiratory irritation in human and are harmful to aquatic life. Zinc oxide was treated with N-tert-butyl-2-benzothiazole sulfenamide (TBBS) accelerator in ethyl acetate solvent to provide a convenient single material component to use as

JUNIPER PUBLISHERS-   Academic Journal of Polymer Science News Nonmetallic materials, which are widely used, have for the most part the polymer nature. These materials include hydrocarbon polymers and inorganic high-molecular compounds that do not contain hydrocarbon groups. Every class of polymers has a number of advantages and disadvantages that requires specific problems to be solved. Inorganic polymers comprising up to 80% of the Earth’s crust involve mono elemental polymers (C n , S i n, G en , P n , B n , A sn , S bn , B in , T en , S en , S n ), polyoxides, borides, nitrides, silicides, phosphides, carbides. Polyoxides (silicates, phosphates, aluminates, borates, germanates, titanates, complex polyoxides - clays, etc.) present the most widespread class of inorganic polymers, which is of greatest interest from the point of view of synthesis, properties, and the possibility of wide application. Inorganic polyoxides have a number of important properties: i

Authored by Shou-ren Wang                                                                            Abstract According to the rapid development of high-speed railway, the importance of spherical bridge bearings has attracted lots of attention as an essential connected part between bridge and pillar [1,2]. As you know, high-speed railway spherical bearings consist of upper bearings plate, spherical plate, under plate, flat stainless-steel plate, flat sliding plate, spherical stainless steel plate, spherical sliding plate, sealing ring, anchor bolt, dustproof shield [3,4]. Flat sliding plate is an indispensable part of spherical bearings since the displacement ability of bearings is determined by the sliding behavior between flat stainless-steel plate and flat sliding plate. Keywords: Spherical bridge; Steel plate; Sealing ring; Cold pressing Mini Review Now the flat plate is made of PTFE, which is categorized as a chemical polym

Authored by Marek Gryta                                                                            Abstract Microporous hydrophobic membranes are applied in membrane distillation. During a long-term of module exploitation, a part of the pores is filled by water, and the membrane wetting causes that the industrial implementation of this process is hindered. Several investigators achieved promising results using the polypropylene membranes formed via TIPS method for various applications of membrane distillation. Keywords: Membrane distillation; Polypropylene membrane; Hydrophobic membrane Abbrevations: MD: Membrane Distillation; PTFE: Polytetrafluoroethylene; PP: Polypropylene PE: Polyethylene; TIPS: Thermally Induced Phase Separation Introduction Membrane distillation (MD) is an evaporation process of water through non-wetted porous membranes. In this process the salts and other non-volatile compounds present in the feed water a

Authored by Marek Gryta Abstract Microporous hydrophobic membranes are applied in membrane distillation. During a long-term of module exploitation, a part of the pores is filled by water, and the membrane wetting causes that the industrial implementation of this process is hindered. Several investigators achieved promising results using the polypropylene membranes formed via TIPS method for various applications of membrane distillation. Keywords: Membrane distillation; Polypropylene membrane; Hydrophobic membrane Abbrevations: MD: Membrane Distillation; PTFE: Polytetrafluoroethylene; PP: Polypropylene PE: Polyethylene; TIPS: Thermally Induced Phase Separation Introduction Membrane distillation (MD) is an evaporation process of water through non-wetted porous membranes. In this process the salts and other non-volatile compounds present in the feed water are retained and the quality of produced distillate is close to distilled w

Authored by Ahmed Esmail Shalan                                                                            Opinion Advanced polymeric materials have showed considerable interest over the past few decades due to their tremendous advantageous coming from the combination of conventional polymeric materials and organic conductors [1-3]. Different features like mechanical, electrical, and optical properties can be founded for advanced polymers due to their confined dimensions at the nanoscale level. Advanced conductive polymers (ACPs) with synthetically tunable hierarchical 3D network structures consider to be one of the nanostructured advanced polymers. It shows great potential for a wide range of applications, such as electronics, bioelectronics and energy storage/conversion devices owing to their structural features [4]. Development of polymers with improved high-temperature properties has been catalyzed as well by the improved understanding of relationships between

Authored by Hiroshi Ito                                                                            Abstract In the present work, we tried to toughen polyamide 6 (PA6) by blending a small amount of low molecular-weight polyethylene (LMWPE). We obtained the PA6/LMWPE blends with different morphologies using multiple melt-kneading methods such as the uniaxial melt-kneading, the eight-axial screw melt-kneading, and the high shearing method. As a result, it was elucidated that the LMWPE was homogeneously and finely dispersed by using the eight-axial melt-kneading method. On the other hand, we found that for high shearing method the LMWPE was finely dispersed to a degree close to the compatible system. The result of the three-point bending test showed that the PA6 was brittle fractured, but it changed to ductile fracture when a small amount of LMWPE was blended. Also, the fracture displacement was extensively improved. The results of the comparison by the melt-kneading me

Authored by Kurbanbekov ShR                                                                             Abstract The paper presents kinetics of hydrogen sorption of Ti-23.5at%Al-21.5at%Nb alloys in isothermal conditions underthe temperature of 450, 500 and 550 °С. It was determined that maximum quantity of absorbed hydrogen is observed at material of sorbed alloy under the temperature of 550 °С. That presents approximately 0.289mass%. It had been found that hydrogen is released under the temperatures within 700 …790 °С. In addition, it was revealed that maximum release of hydrogen composes 85% of samples saturated under the temperature of 550 °С. Keywords: Intermetallic compound; Absorption-desorption; Hydrogen; Plasticity; Crucible Introduction As is known, to find a safe method for reversible hydrogen storage is currently one of the important issues in the field of hydrogen energetics. Storage of the hydrogen in various hydrid

Authored by Nisha Bagotia                                                                               Abstract The main objective of this article is to describe the effect of different length (aspect ratio) of carbon nanotubes (CNTs) on the electrical conductivity and electromagnetic shielding effectiveness of polystyrene/l-MWCNT and toughened polycarbonate/s-MWCNT composites. Long and short MWCNTs having aspect ratio of ~666 - 1333 and ~157 respectively were used for melt-mixed with polystyrene and toughened polycarbonate in a micro compounder. The uniform dispersion of MWCNT in matrix was confirmed by scanning electron microscopy. The realization shielding effectiveness value of -21dB respectively for PS/l-MWCNT composites: and -27dB for TPC/s-MWCNT composites at 10phr loading of MWCNTs, which show their potential use in making of mechanically strong and light weight EMI shield used for commercial application. Keywords: Polycarbonate; Polystyrene; Multiwalled c