The laminated natural rubber bearings (NRBs) used in offshore or sea-crossing bridges, are subjected to marine environments over an extended period and therefore vulnerable to the effect of alternating ageing and sea corrosion caused by weather conditions such as temperature, rain, sun, sea winds, waves etc. In addition, there are no systematic theories about the tension capability for NRBs now. Therefore

Corynespora cassiicola is a cosmopolitan fungus with a broad host range. One of the hosts often severely impacted is the rubber tree, Hevea brasiliensis on which it causes devastating leaf defoliation. To date, control of the disease is mainly focused on the application of fungicides, but this only provides short-term solution. Functional genomics through transformation allows evaluation of the disease

Field latex is an important raw material in Thailand, produced by a large number of smallholders and handled by numerous local traders. This diversity of stakeholders involved along the production and marketing chain could result in the variability of the latex quality delivered to the factories. Latex processing industries need a raw material with consistently specified properties. Therefore, it is

Certain materials such as wax, when incorporated into rubber formulations, bloom and form a surface barrier layer against ozone attack. The ozone resisting film results in an unpleasant appearance on the rubber surface. In tyres, sidewalls are more susceptible to ozone attack leading to degradation both in dynamic and static conditions. Also, tyre appearance is an important factor in quality control

Isolators have become more attractive to researchers and industries alike over the past decade. Nonlinear stiffness for the rubber isolator is designed in the floating slab system to obtain or maintain the desired natural frequency. According to the vibration mechanics theory, the natural frequency formula can be deduced backward to obtain the function of stiffness. This then yields a simple integral

The present paper presents numerical and experimental comparative studies between the conventional bending process (bending using punch and V-die) and bending with a rubber-pad cushion. In fact, a finite-element method is introduced to compare these two procedures used to bend AA1050-H14 Aluminum thin sheet. An elastoplastic constitutive model with quadratic yield criterion of Hill 48 and isotropic

Carbon black is the prime component used in tyre manufacturing. Normally, 40–60 phr of carbon black is added in rubbers to enhance their physico-mechanical properties. Utilisation of high amounts of carbon black during tyre manufacturing will certainly lead to more fly loss, which may create several health hazards to humans involved in the mixing operation. This research work aims to partially replace

The purpose of this paper is to present a study of elastoplastic deformation in an isotropic material disk with shaft subjected to variable density and load using Seth’s transition theory. This theory includes classical macroscopic solving problems in plasticity, creep and relaxation and assumes semi-empirical yield conditions. It has been observed that the values of angular speed decreased with increases

TiO2/sericite (Ser) was prepared by depositing a nano-TiO2 film onto a carrier composed of sericite, an inorganic and nonmetallic mineral. Ultraviolet-resistant and antibacterial layers were then separately loaded onto the nano-TiO2 film, forming a multifunctional composite. The obtained functional TiO2/Ser composite was used as a filler and introduced into a rubber composite. It was indicated that

Abstract In this work, a noble method is used to develop clay–polymer nanocomposite (CPN) with improved dispersion of bentonite clay (as reinforcing filler) in a nano-Styrene Butadiene Rubber/Natural Rubber blend system. The tendency of the clay particles to agglomerate has been reduced to a great extent. The observed increase in tensile modulus and the storage modulus of the ultimate CPN is attributed

Waste rubber with three-dimensional structure is insoluble and non-melting, which creates recycling problem. The technique called “high-pressure high-temperature sintering” (HPHTS) can convert vulcanized rubber powder into usable rubber products. However, reversion occurs when vulcanizates are exposed to a prolonged treatment at high temperature. This reversion results in the decrease of mechanical

The rubber tree (Hevea brasiliensis) is the world’s major source of natural rubber. An expedition to the Amazonas and Para states by the Rubber Research Institute of Malaysia (RRIM) in 1995 led to the successful collection of more than 50,000 genotypes from different locations of the states to broaden the existing gene pool. Realising the severe limitations faced with large germplasm, a core collection

The incorporation of prevalent industrial wastes (i.e. residues) from sugar industries as reinforcing fillers in rubber composites has emerged as a viable solution, enabling improvements in the environment, and getting rid of bagasse waste has also resulted in cost reduction of the final rubber products. In this study, the use of maleic anhydride was proposed to improve the interfacial adhesion between

This article investigates the effect of swelling temperature on palmitic acid-based shape memory natural rubber (SMNR). SMNR has high storage modulus and excellent energy absorption capability which is suitable to replace the electronic parts in the lightweight machine. Although the swelling process increased the trigger temperature of palmitic acid-based SMNR, high thermal energy in swelling process

Many researchers believe that the adhesion failure between rubber and cement paste is one of the main reasons the strength of concrete containing these aggregates drops sharply. This paper provides strength and durability experiment results which reveal the effect of pre-coating rubber granules with crushed dune sand in terms of their mechanical performance, these tests aimed to enhance the durability

High cis-polybutadiene (HCBR) was epoxidized by using in situ formed formic acid and hydrogen peroxide in the absence and presence of Tween 20 at 50 °C at different reaction times. Epoxidized HCBR (EHCBR) with degree of epoxidation from 3.7 to 38.8% was obtained. Low degree epoxidation EHCBR are semi-crystalline rubbers presenting lower crystallization temperatures than the non-epoxidized rubber on

Full-length cDNA libraries (< 1 kb, 1–2 kb, 2–3 kb, 3–6 kb size ranges) were generated from latex of a Hevea brasiliensis tree clone, RRIM 600, for PacBio Iso-Seq sequencing. The total number of high-quality consensus sequences obtained from nearly 20 Gb of raw reads was 207,943 having an average length of 1823 bp and N50 of 2538 bp. Mapping of high-quality consensus sequences to the published Reyan

To date, epoxidized natural rubber (ENR) latex is still far from being commercially available for the production of dipped latex goods although the process was reported in 1922. Therefore, the objective of this work is to establish an understanding on the colloidal properties of ENR latex and relate them to coagulation and film formation. To do so, ENR latex was first prepared from low ammonia preserved

In this study, response surface methodology and desirability function approach (DFA) were used to optimise the vulcanisation process of elastomeric bearings to obtain better quality products. For this purpose, compressive stiffness and vertical deflection under maximum load were determined as response variables with a target at 198 kN/mm and 3.46 mm, respectively, in accordance with customer’s request

In this work, a novel self-healing natural rubber was developed, and the concepts of mixing both covalent and reversible ionic crosslinks bonds were proposed. The developed materials have the capability of repairing themselves and recovering functionality when they are damaged without the need for detection. Evidence that covalent and reversible ionic crosslinks bonds had occurred was determined by

The original version unfortunately contained mistakes. The institution of the author Jitladda Sakdapipanich was wrong.

Our aim was to study the association between the rubber accelerators and predisposing factors of irritant contact dermatitis (ICD) among the semiconductor factory workers. The research design was a historical cohort study. The study population was divided into two groups: (1) the rubber accelerator exposure group, including workers who wore natural rubber finger cots containing 2,2 dibenzthiazyl disulfide

During the last 21 year period from 1996–2016, the total value of imports of rubber and rubber products grew at a rate of 17.66% compared to 14.18% growth rate in the value of exports. As a result of higher growth in imports and lower growth in exports, in the last 10 years, external trade in this segment had shown negative balance of trade consistently. In 2016–2017, the country had a negative balance

Wear and high–low temperature resistance composites with enhanced mechanical and thermal properties were preparation by carbon fiber (CF) reinforced silicone rubber (MVQ)/fluorine rubber (FKM), the coupling agent was used as a compatibilizer. The effect of coupling agent type and content on mechanical properties of CF/MVQ/FKM composites was investigated, the interaction between coupling agent and composites

Vulcanisation is the key process for determining the final properties of elastomers due to the relationship between curing condition and viscoelastic behaviour. This study focuses on the variations in the dynamic behaviour of silica-filled natural rubber caused by crosslinking. The rubber samples with different degrees of curing (DOC) are prepared by thermal quenching during the crosslinking process