Multiaxial stress states in components are evaluated with the methods of stress analysis. However, when designing with von Miseshypothesis, under dimensioning can occur for multiaxial tensile loadings. More complex strength criteria require further tests for parame ter fitting. However, these tests are of ten costly and may be subject to excessive scatter. As an alternative, the parameters can be estimated on the basis of model based assumptions. 

The technological properties of unsaturated polyesters synthesized on the base of products from alcoholysis of secondary polyethylene terephthalate, which meets the requirements of the technology for the production of polymer composite and fiberglass pipes, are studied.

By way of comparison to the mineral oils conventionally used (TDAE and MES), chemically modified vegetable oils were employed as plasticizers in NR and s-SBR and as compatibilizers in the blend system. 

LDPE/Gr nanocompounds were studied based on graphene (Gr)-distribution, morphology and crystal structure according to different methods such as, Ramanspectroscopy (RS), XRD, SEM and TEM. Outcomes presented by SEM showed, that the Grs addition was homogeneously distributed in LDPE matrix and the crystallinity of the LDPE/Gr nanocompounds was improved. Inclusion of Grs to LDPE launches crystallization through lowering the energy of activation accompanied by growing crystallization. 

The thermogravimetric analysis was applied to obtain the activation energy of the thermaldegradation of LLDPE containing the antioxidant reagent (AO) from 0.0 phr to 0.25 phr. The heating rate was from 0.1 K/min to 5.0 K/min.

This paper deals with investigations in to the additive manufacturing of an EP DM-based high-viscosity sulfur-curable rubber compound. In order to make the compound processible using „Direct Ink-Writing“, different solvent concent rations are used to reduce the com pound viscosity to the limited process window. For 3D-printing process variab le process parameters are used to opti mize the quality of the rubber part, which is controlled by laser confocal microscope, 3D-μ-CT and physical pro perties. In addition, the effect of residu al solvent in the polymer, respectively in the semi-finished product, affect the possible volume shrinkage caused by evaporation processes of the printed part during vulcanization. 

This paper presents the development of a novel recycling process for EPDM rub ber waste in a twin screw extruder by combining three process steps: chemi cal devulcanization, activation with a li quid polymer (LP), and compounding of the curing system. The effects of LP amount, extruder parameters such as flow rate and screw speed, and amount of curing system were studied. Rheo meter and mechanical tests evaluated the quality of the re-vulcanizates. The secondary raw material was used to produce seals by injection molding, and their properties met the requirements of DIN EN 681-1:2006 for the produc tion of sealing systems. A best practice for the continuous process and compo site formulation is presented. 

The films from polymer blend composed of polyvinyl alcohol (PVA) and Chitosan (CS) loading with curcumin and rosemary extracts were prepared by casting technique. They were applied for a controlled release system. It was found that the investigated polymer is a good carrier for holding the bioactive natural ingredients (curcumin and rose mary extracts) for controlling their sustained release and increases their efficiency for long acting protection of human beings towards Alzheimer’s disease.

The molecular-level response to shear of entangled polymers at interfaces and in the bulk has been of interest to un derstand the non-linear rheological res ponse of polymers. Here we focus on the molecular level response to shear strain leading non-linear rheological phenomenon, in linear and star poly mers 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 res ponses with rheoNR measurements in cone-and-plate geometry. 

The Polyurethane Reaction Injection Mol ding (PU RIM) process is currently still reli ant on a high level of know-how, both in the case of quality deviations of the pro duct and in the initial configuration of molds. PU manufacturing hardly uses the established sensor technologies that are common in injection molding. In a re search project at the Institute for Plastics Processing (IKV), the influence of the pro cess parameters component tempera ture, mold temperature, material output speed and mixing ratio on the curing be havior of compact polyurethane coating systems is being experimentally investi gated by means of dielectric measure ments. The results show that for all varia tions of the process parameters investi gated, the influence on the curing reac tion could be successfully detected.