Papers - Archive

Nr 3/2016 - Abstracts

Elastomery nr 3/2016 cover

Anna Olejnik, Aleksandra Smejda-Krzewicka, Paulina Dmowska-Jasek, Krzysztof Strzelec

Wood flour as the filler of carboxylated acrylonitrile-butadiene rubber

The effect of the amount of natural fillers on the crosslinking of carboxylated acrylonitrile-butadiene rubber (XNBR) and the properties of the obtained vulcanizates were examined and compared. Wood flour derived from coniferous (MDI) or deciduous trees (MDL) was used as the filler. It has been found that blends of XNBR/MDI and XNBR/MDL heated for 30 minutes in the presence of magnesium oxide (MgO) achieved high crosslinking degree, decreasing slightly with the amount of the filler. The presence of the filler affects the mechanical properties of obtained vulcanizates. Vulcanizates filled with wood flour derived from coniferous and deciduous trees are characterized by satisfactory tensile strength. The value for tensile strength was to 21 MPa for the vulcanizate containing 20 phr of MDI or MDL. The vulcanizates exhibit good resistance to thermo-oxidative aging. The addition of both MDI or MDL clearly and lastingly improves the smell in the vulcanizates.

Izabela Irska, Elżbieta Piesowicz, Zbigniew Rosłaniec

Biodegradable PLA-based thermoplastic elastomers

Due to the number of advantages such as high tensile strength, sensitivity to hydrolytic degradation and biocompatibility PLA is one the most common polyester for biomedical applications. However, PLA is rigid, brittle polymer with low heat deflection temperature and small elongation at break. In order to broaden the range of PLA applications it is necessary to improve these properties. In recent years a number of new methods have been elaborated to obtain PLA-based materials with improved characteristics. On the basis of recent literature review, the numerous laboratory investigations of thermoplastic elastomers with the presence of biodegradable polylactide were presented. Different approaches to obtain materials with controlled mechanical and biological properties are discussed, taking into account the methods of copolymerization and reactive blending. The aim of this review is to deliver a discussion of design strategies for PLA based elastomers and to describe recent advances in the synthesis, properties and potential application of these materials, especially in soft tissue engineering.

Jagoda Kowalska, Zbigniew Czech

Properties of photoreactive acrylic pressure-sensitive adhesives with different concentration of photoinitiator

To investigate the effect of concentration photoinitiator in acrylic pressure-sensitive adhesives crosslinked using UV-C radiation on the properties of synthesized acrylic adhesives, containing 0,5;0,75 and 1% wt. ABP. They are coated with transfer method (adhesive film having a basis weight 45 g/m2) on a film of poly(vinyl chloride) modified with a plasticizer DINCH (1,2-cyclohexane dicarboxylic acid diisononyl ester). After crosslinking using UV-C with radiation dose of 5, 10, 15, 20, 30 and 50 mJ/cm2 adhesives films were tested on basic properties: peel adhesion, tack, cohesion and shrinkage. The self-adhesive and mechanical properties was explored according to the international method: AFERA 4015, AFERA 4001, FINAT FTM 8, FINAT FTM 14. The optimal dose of UV-C radiation used to crosslink the self-adhesive photoreactive composition was in the range of 15-50 mJ/cm2. PSAs at lower radiation doses are characterized by higher values of adhesion and tack value, however, the shrinkage is too high and therefore unacceptable for industrial applications. The composition comprising 0.75% wt. photoinitiator ABP is characterized by best properties ? shows the highest values of adhesion, tack, cohesion, and the lowest value of contraction.

Przemysław Jaszak

Modelling of the rubber in Finite Element Method

Paper presents the modelling of the strain and stress state of the elements made of rubber. In modelling used Finite Element Method (FEM). Overview of the most popular phenomenological model of the strain energy density in hyperelastic material was presented. The test procedure which have to be carry out to define material model were explained and discussed. Verified and valid the numerical outcome was based on the experimental results. The useful example of the numerical simulation of the rubber component was shown based on design way of the rubber bellow.
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