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Petzold G.,Leibniz Institute fur Polymerforschung Dresden e.V. | Petzold-Welcke K.,Friedrich - Schiller University of Jena | Qi H.,Friedrich - Schiller University of Jena | Stengel K.,Thuringisches Institute For Textil Und Kunststoff Forschung | And 2 more authors.
Carbohydrate Polymers | Year: 2012

The removal of dissolved and colloidal substances (DCS) in paper cycling water, so called stickies, with tailored natural polymers, having cationic as well as hydrophobic groups, was investigated using model suspensions made by the recycling of paper. The sticky content, characterized by the turbidity, the anionic charge, and the total organic carbon content (TOC) was increased by the addition of latex. The dynamic surface tension was established as useful tool for the characterization of the sticky content. The sticky removal using the starch derivatives (with benzyl- as well as ethyl-substituents), from very low up to high cationic charge and N-(benzyl)chitosan was compared. Depending on the properties of the derivatives two possible mechanisms can be found: "charge dominated removal" or "removal dominated by hydrophobicity." It seems that turbidity and TOC are lowered especially due to charge interaction whereas the increase of the surface tension is mainly caused by the hydrophobic character of the modified natural polymers. © 2012 Elsevier Ltd. All rights reserved.

Orlob I.,Ostthuringische Materialprufgesellschaft fur Textil und Kunststoff mbH | Reussmann T.,Thuringisches Institute For Textil Und Kunststoff Forschung
Gummi, Fasern, Kunststoffe | Year: 2011

The fibre-reinforcement of elastomers becomes more and more important, even though seemingly opposing properties such as the elastic force of rubbers and the stiffness of fibres are combined. The driving force of interest is to optimise possible properties, and resulting therefrom, to render new applications possible. The focus of discussion in this paper is the potential of the aramid fibre silicone rubber composite, especially its processing by liquid injection moulding. The aim of this work is to find a possibility to improve the known bad adhesion between aramid fibres and silicone rubber. The paper mainly concentrates on the effect of a mechanical fibre surface roughening and the mode of action of various chemical coupling agents.

Muller K.,Thuringisches Institute For Textil Und Kunststoff Forschung | Reussmann T.,Thuringisches Institute For Textil Und Kunststoff Forschung | Lutzkendorf R.,Thuringisches Institute For Textil Und Kunststoff Forschung | Schmitt M.,Teijin Aramid GmbH
Gummi, Fasern, Kunststoffe | Year: 2011

Aramid pulp offers high potential in the field of reinforced thermoplastic composites because of its highly fibrillated structure and as a result its high surface area. But there are also facts which prevents its application in thermoplastics: poor free-flowing and dozing properties. Thus, continues dozing during compounding is not possible. But within a R&D-project it was possible to find a way of producing metered semifinished parts like flakes. The results of compounding and injection molding of metered aramid pulp with PA 6 are summarized in the following article.

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