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Molecular-Scale Polymer Melts Response to shear in the linear and non-linear rheological
Domains: Affect of molecular Weight and complex Architecture

Molecular-Scale Polymer Melts Response to shear in the linear and non-linear rheological

The molecular-level response to shear of entangled polymers at interfaces and in the bulk has been of interest to understand the non-linear rheological response of polymers. Here we focus on the molecular level response to shear strain leading non-linear rheological phenomenon, in linear and star polymers comparing the observed response to the predictions of tube theory. We used SANS measurements of the bulk polymer response to shear in Couette geometry on melts of high molecular weight mixtures of polymers extending our previous results on interfacial responses with rheoNR measurements in cone-and-plate geometry.[1, 2] further development of the theory.

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Influence of Process Parameters on the Curing of Polyurethanes by dielectric Measurements
A wide range of variants of the reaction injection molding process

Influence of Process Parameters on the Curing of Polyurethanes by dielectric Measurements

The Polyurethane Reaction Injection Molding (PU RIM) process is currently still reliant on a high level of know-how, both in the case of quality deviations of the product and in the initial configuration of molds. PU manufacturing hardly uses the established sensor technologies that are common in injection molding. In a research project at the Institute for Plastics Processing (IKV), the influence of the process parameters component temperature, mold temperature, material output speed and mixing ratio on the curing behavior of compact polyurethane coating systems is being experimentally investigated by means of dielectric measurements. The results show that for all variations of the process parameters investigated, the influence on the curing reaction could be successfully detected.

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