Application of a blending rule for the complex viscosity of polymer melts

Schuch, Horst

doi:10.1007/bf01332159

Cited by 20 publications

(5 citation statements)

References 6 publications

(15 reference statements)

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“…The equations to be found in literature to de- [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] scribe the material behavior of two-phase systems as a function of the mixing parameters are basically limited to the description of the viscosity. Our own investigations of the material behavior of two-phase systems showed that, apart from the rheological quantities, the thermodynamic quantities of twophase systems cannot be determined by means of a linear averaging of the source material data.…”

Section: Materials Characteristics Of Two-phase Systemsmentioning

confidence: 99%

“…The easiest and most common statement is the so-called logarithmic law of mixtures according to Arrhenius (Table III) For compatible polymers with a ratio of intransic vis- cosity of less than 10 this statement leads to good results. For the evaluation of the statements to 25,26 describe the viscosity of incompatible polymers, different blends from a mixture of a high-density polyethylene of different weight contents with low-density polyethylene, a polypropylene and a polyamide have been processed without compatibilizer on a corotating twin screw extruder. The results of the subsequent rheological investigation are documented in Figure 15.…”

Section: Description Of the Viscosity Of Polymer Bendsmentioning

confidence: 99%

See 1 more Smart Citation

Design of a compounding extruder by means of the SIGMA simulation software

Potente¹,

Bastian²,

Flecke³

1999

Adv. Polym. Technol.

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The simulation program SIGMA, which can be used to assess the compounding process on tightly-intermeshing, co-rotating twin screw extruders, was developed within the framework of a joint project conducted by the Institut fü r Kunststofftechnik (KTP) of the University of Paderborn and fifteen industrial companies of several fields in the polymer industry. The program presented here permits calculations based on physical mathematical models of the pressure, temperature, local degree of filling, melting, residence time, mixed substance characteristics derived therefrom, power consumption, and degree of dispersion of the machine. These results assist the designing process engineer in the optimization of existing equipment or in the designing of new equipment.

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Section: Materials Characteristics Of Two-phase Systemsmentioning

confidence: 99%

Section: Description Of the Viscosity Of Polymer Bendsmentioning

confidence: 99%

Design of a compounding extruder by means of the SIGMA simulation software

Potente¹,

Bastian²,

Flecke³

1999

Adv. Polym. Technol.

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“…Various empirical and theoretical attempts to determine molecular weight distributions of polymers from theological data can be found in the literature [1,[6][7][8][9][10]. In our analysis, we present a method of calculation based on the phase angle of the complex modulus, which is one of the most important material functions for the description of both regular and polymer modified asphalts.…”

Section: Introductionmentioning

confidence: 98%

Molecular weight distribution of regular asphalts from dynamic material functions

Zanzotto

Stastna

1999

Mat. Struct.

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A B S T R A C T R [ S U M EDynamic material functions are among the most sensitive tools for determining the molecular weight distribution ofrheologically complex systems. The phase angle of the complex modulus especially is sensitive to the molecular weight of the studied material; it can therefore be used as the input to the inverse problem of determining the molecular weight from this important dynamic material function. Molecular weight distributions of several regular asphalts are calculated using the phase angle and compared with molecular weight distribution obtained by gel permeation chromatography. The problems of calculating molecular weight distributions from rheological parameters are also discussed.

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“…The calculated blend viscosity was determined by means of the mixing rule according to Arrhenius27, 28: The viscosity curve of the polymer blend shows that the experimental blend viscosity is lower than the viscosity of the individual components. Therefore, a calculation of the blend viscosity by means of a linear mixing rule such as the statement by Arrhenius is unsuitable for this blend system.…”

Section: Methodsmentioning

confidence: 99%

Experimental investigation of the morphology development of polyblends in corotating twin-screw extruders

Potente

Bastian

Gehring

et al. 2000

J. Appl. Polym. Sci.

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Compounding extruders are still designed based on experience and timeconsuming experimental examinations. This work investigates the morphology development of incompatible polyblends along a mixing zone at the end of a corotating twin-screw extruder. During the process, the samples are taken from the running extruder using special barrel plates. These samples are subsequently examined by means of scanning electron microscopy (SEM). This method allows sampling in less than 1 min and thus extremely fast and almost unaffected. The experimental investigation of the morphology development improves the knowledge about the factors essentially influencing the blending process. It also allows the verification as well as improvement of theoretical models. Polyblends of polypropylene (PP) and polyamide (PA) with 7.5, 15, and 30 wt % PA were examined. As well as the relevance of the mass percentage of the dispersed phase, the influence of the screw geometry, the screw speed, the melt temperature, the melt throughput, and the pressure profile was investigated. Apart from the melt throughput, all varied factors show an influence on the resulting blend morphology that may not be neglected. However, the changes of the mean particle sizes in the observed mixing zones are only gradual (mean particle size Ϸ 1-4 m), which can be attributed to the extremely fine blend morphology already existing during or after the melting. That means that the application of "classic melting zones" generally already produces finely dispersed blend morphologies, thus proving the essential importance of the melting zones regarding the development of the blend morphology. Consequently, the mean particle sizes, calculated by means of quantitative image analyses of SEM micrographs in the mixing zones following the homogenizing section only slightly depend on the compounding conditions (screw speed, melt throughput, screw geometry, melt temperature, and pressure profile). However, the direct visual analysis of the SEM images, especially in the first parts of the mixing zones, shows the simultaneous existence of large PA6 particles in the PP matrix. In addition, a downstream unification of the particle size distribution can be observed. Especially the number and size of the coarser particles decreases in the mixing zones.

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Application of a blending rule for the complex viscosity of polymer melts

Cited by 20 publications

References 6 publications

Design of a compounding extruder by means of the SIGMA simulation software

Design of a compounding extruder by means of the SIGMA simulation software

Molecular weight distribution of regular asphalts from dynamic material functions

Experimental investigation of the morphology development of polyblends in corotating twin-screw extruders

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