Papers - Archive

Nr 1/2018 - Abstracts

Elastomery nr 1/2018 cover

Ali Vahidifar, Elnaz Esmizadeh, Denis Rodrigue

Effect of the simultaneous curing and foaming kinetics on the morphology development of polyisoprene closed cell foams

Closed cell foams based on polyisoprene rubber (IR) were produced via compression molding using azodicarbonamide (ADC) as a chemical blowing agent. The effect of processing temperature on ADC decomposition, as well as IR curing with and without ADC were studied to determine the effect of this parameter on the final foam morphology and mechanical properties. The kinetic study showed that the autocatalytic model is appropriate to represent the experimental data. The activation energy for ADC decomposition (Ea = 181.8 kJ/mol) was found to be much higher than for IR curing without (Ea = 79.6 kJ/mol) or with (Ea = 72.3 kJ/mol) ADC. This indicates that with increasing temperature the rate of ADC decomposition accelerates faster than rubber vulcanization, so an optimization must be performed. For example, increasing the temperature from 140 to 150°C decreased the average cell size from 355 to 290 µm while increased the cell density from 73 to 118 cell/mm3. But further temperature increase led to larger cell size and lower cell density because of a balance between cell coalescence and crosslinking. For the optimized temperature (150°C), the foams had the highest modulus of elasticity and hardness.
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Cezary Dębek

Possibilities of using post-consumer toners in rubber compounds

The paper presents the properties of recycled toner used in laser printers and the properties of rubber compounds and vulcanizates of SBR, NBR and EPDM rubbers containing toner as filler. To compare the properties of rubber compounds and vulcanizates, analogous rubber mixes containing technical grade carbon blacks: N330, N550 and N772 were made. Obtained results were evaluated because of the possibility of recycling toner as filler in rubber products. It has been found possible to use toner as filler in NBR vulcanizates because it provides satisfactory mechanical properties, improvement of processing properties and resistance to thermal ageing.
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Głowińska Ewa, Datta Janusz, Włoch Marcin, Różańska Martyna

The influence of chemical structure on mechanical and thermomechanical properties of cast biopolyurethane elastomers

The aim of the work was to obtain biopolyurethane elastomers from two bio-based components such as 1,2-biopropanediol or 1,3-biopropanediol (glycols) and hydroxylated soybean oil (as a mixture with commercial polyol). The influence of bio-based components on the chemical structure of elastomer and mechanical and thermo-mechanical elastomer properties (at static and dynamic conditions) were investigated. Based on FTIR-ATR results the changes in the chemical structure have been noticed, what is related to the diversified chemical structure of bioglycols and oil polyol, too. The results of static tensile tests show the benefits from using of bioglycol with two primary hydroxyl groups. Also the dynamic mechanical analysis (DMA) results indicated changes in the storage modulus (E′), loss modulus (E″) and damping factor (tan δ) values.
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Przemysław Jaszak, Janusz Skrzypacz, Konrad Adamek, Paweł Myjak

Rubber compensator stiffness analysis using finite element method and experimental tests

The paper presents the mechanical properties of the NBR and EPDM 65 Shore A hardness rubber. The results in the form of uniaxial and biaxial tension are necessary data to preform numerical analysis of the elements made of rubber. To design of the rubber expansion joint with increased strength the numerical analysis based on finite elements method was used. The numerical model of the rubber bellow subjected to complex load as results determined stiffness in different axial direction as well as permissible stress guarantying its failure-free exploitation.
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