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November 2002
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18 Reads
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18 Citations
Kautschuk und Gummi Kunststoffe
Melt mixing with dynamical stabilization of the interphase is a way to produce Elastomeric Alloys (EA) from rubber crumb whose properties are near the ones of Thermoplastic Elastomers (TPE). The phase coupling at the interface in dynamically stabilized Elastomeric Alloys is characterized by means of stress-strain-behavior analysis and scanning electron microscopy.
July 1999
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39 Reads
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25 Citations
Kautschuk und Gummi Kunststoffe
Investigations on a blend of ground tyre rubber (GTR) and a commercially available polypropylene were conducted. Agents such as peroxides, sulphur, polyfunctional monomers and reclaiming agents were added as initiators or acceptors of radicals as well as cross-linking agents. The produced Elastomeric Alloys (EAs) exhibit good processing properties of thermoplastics. At the same time, the test specimens processed by conventional injection moulding were characterized by a special profile of properties near that of rubber. The properties of the EAs were achieved by determined optimization of formulation and compounding process and based on morphological peculiarities.
July 1997
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16 Reads
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10 Citations
Polimery
When vulcanized in an internal mixer under specific shearing conditions at temperatures exceeding the melting point of PP and with sulfur or cumyl peroxide or (sulfur + cumyl peroxide) used as a crosslinking agent, powdered rubber waste - PP blends gave thermoplastic materials exhibiting properties close to those of thermoplastic elastomers. Studies on the content of polymer-bound sulfur in, and on the solubility of, the resulting materials in selective solvents (chloroform, xylene) at elevated temperatures showed the chemical reactions of dynamic vulcanization to involve bonding of sulfur by the polymer, continued crosslinking reactions and degrading of the powdered scrap, and PP transformations including grafting of PP on powder particles. Compared with the original PP, the resulting materials were characterized by enhanced impact strength at -20°C, greater elongation at break, and still acceptable breaking strength.
... Polymer modification for improved properties and applications are currently being researched worldwide [1][2][3][4] investigated the bonding characteristics of ground rubber (GR) blended with isotactic polypropylene (PP) and discovered that properties comparable with commercial thermoplastic vulcanizates were achieved when creating bonds between the rubber particles and the thermoplastic matrix. Xin et al. [5] prepared expanded composites from GR/PP using a single-screw foam extrusion setup and chemical blowing agent. ...
July 1997
Polimery
... Elles peuvent être mélangées à un thermoplastique tel que le polypropylène ou le polyéthylène pour obtenir un thermoplastique élastomère. Pour atteindre de bonnes propriétés mécaniques, il est nécessaire d'ajouter un troisième élément permettant l'adhésion entre le thermoplastique et l'élastomère [1]. Depuis les années 90, des TPE ont été développés avec des élastomères recyclés en remplacement d'élastomères vierges. ...
November 2002
Kautschuk und Gummi Kunststoffe
... Polymer modification for improved properties and applications are currently being researched worldwide [1][2][3][4] investigated the bonding characteristics of ground rubber (GR) blended with isotactic polypropylene (PP) and discovered that properties comparable with commercial thermoplastic vulcanizates were achieved when creating bonds between the rubber particles and the thermoplastic matrix. Xin et al. [5] prepared expanded composites from GR/PP using a single-screw foam extrusion setup and chemical blowing agent. ...
July 1999
Kautschuk und Gummi Kunststoffe
