Search Results - "Syrjälä Seppo"

A comparison of rheology and FTIR in the study of polypropylene and polystyrene photodegradation by Mylläri, Ville, Ruoko, Tero-Petri, Syrjälä, Seppo

“…ABSTRACT Rheology and FTIR spectroscopy are compared as methods to study the degree of photodegradation in polypropylene (PP) and polystyrene (PS) sheets. The…”
Get full text

Sedimentation stability and rheological properties of ionic liquid–based bidisperse magnetorheological fluids by Jönkkäri, Ilari, Isakov, Matti, Syrjälä, Seppo

“…The sedimentation stability and rheological properties of ionic liquid–based magnetorheological fluids comprising a mixture of micron- and nano-sized particles…”
Get full text

Measurement of the pressure dependence of viscosity of polymer melts using a back pressure-regulated capillary rheometer by Aho, Johanna, Syrjälä, Seppo

“…The effect of pressure on the melt viscosity was experimentally investigated for five polymers: polycarbonate (PC), acrylonitrile-butadiene-styrene (ABS),…”
Get full text

Shear viscosity measurements of polymer melts using injection molding machine with adjustable slit die by Aho, Johanna, Syrjälä, Seppo

“…Rheological properties of polymer melts were studied using a slit die attached to an injection molding machine. The die has three exchangeable inserts to set…”
Get full text

On the measurement and modeling of viscosity of polymers at low temperatures by Aho, Johanna, Syrjälä, Seppo

“…Viscosity was measured for three amorphous polymers, PS, PMMA and PC, down to temperatures well below those normally available. Measurements were made in the…”
Get full text

Capillary rheometry of polymer melts — Simulation and experiment by Syrjälä, Seppo, Aho, Johanna

“…This paper discusses shear viscosity measurements of polymer melts by the capillary rheometer. Particular emphasis is placed on investigating the effects of…”
Get full text

The effect of melt spinning process parameters on the spinnability of polyetheretherketone by Mylläri, Ville, Skrifvars, Mikael, Syrjälä, Seppo, Järvelä, Pentti

“…This study has been carried out to investigate the processing parameters affecting polyetheretherketone's (PEEK) spinnability in a melt spinning process. PEEK…”
Get full text

Effect of rotational speed of twin screw extruder on the microstructure and rheological and mechanical properties of nanoclay-reinforced polypropylene nanocomposites by Peltola, Piia, Välipakka, Elina, Vuorinen, Jyrki, Syrjälä, Seppo, Hanhi, Kalle

“…The morphology and rheological and mechanical properties of nanoclay‐reinforced polypropylene nanocomposites were investigated with aid of transmission…”
Get full text

Sulfonated polyetheretherketone/polypropylene polymer blends for the production of photoactive materials by Fatarella, Enrico, Mylläri, Ville, Ruzzante, Marco, Pogni, Rebecca, Baratto, Maria Camilla, Skrifvars, Mikael, Syrjälä, Seppo, Järvelä, Pentti

“…ABSTRACT Sulfonated polyetheretherketone (SPEEK) was synthesized via a mono‐substitution reaction of PEEK in concentrated sulphuric acid and was blended with…”
Get full text

Measurement technique and data analysis of extensional viscosity for polymer melts by Sentmanat extensional rheometer (SER) by Aho, Johanna, Rolón-Garrido, Víctor H., Syrjälä, Seppo, Wagner, Manfred H.

“…Transient extensional viscosity of low-density polyethylene was measured by Sentmanat extensional rheometer in combination with MCR301 rheometer (Anton Paar)…”
Get full text

Production of sulfonated polyetheretherketone/polypropylene fibers for photoactive textiles by Mylläri, Ville, Fatarella, Enrico, Ruzzante, Marco, Pogni, Rebecca, Baratto, Maria Camilla, Skrifvars, Mikael, Syrjälä, Seppo, Järvelä, Pentti

“…ABSTRACT New photocatalytic fibers made of sulfonated polyetheretherketone (SPEEK)/polypropylene (PP) are melt compounded and melt spun, first on laboratory…”
Get full text

Numerical investigation of a plate heat exchanger thermal energy storage system with phase change material by Taghavi, Mehrdad, Poikelispää, Minna, Agrawal, Vaibhav, Syrjälä, Seppo, Joronen, Tero

“…Plate-type thermal energy storage systems (PTESs) have been proposed to mitigate the effect of the low thermal conductivity of phase change materials on the…”
Get full text

Evaluation of Different Methods for Determining the Entrance Pressure Drop in Capillary Rheometry by Aho Johanna, Syrjälä Seppo

“…Two approaches for determining the entrance pressure drop in capillary rheometry were compared with low-density polyethylene and polystyrene melts as test…”
Get full text

Evaluation of Techniques for Measuring the Yield Stress of a Magnetorheological Fluid by Jönkkäri Ilari, Syrjälä Seppo

“…The yield stress of a magnetorheological fluid was measured as a function of magnetic flux density using different techniques. The yield stress values were…”
Get full text

Extensional viscosity in uniaxial extension and contraction flow—Comparison of experimental methods and application of the molecular stress function model by Aho, Johanna, Rolón-Garrido, Víctor H., Syrjälä, Seppo, Wagner, Manfred H.

“…Extensional viscosity of a low-density polyethylene was measured at three temperatures in uniaxial extension by Sentmanat Extension Rheometer, and in…”
Get full text

Melt-compounded nanocomposites of titanium dioxide atomic-layer-deposition-coated polyamide and polystyrene powders by Nevalainen, Katja, Isomäki, Nora, Honkanen, Mari, Suihkonen, Reija, McNally, Tony, Harkin-Jones, Eileen, Syrjälä, Seppo, Vuorinen, Jyrki, Järvelä, Pentti

“…Polyamide and polystyrene particles were coated with titanium dioxide films by atomic layer deposition (ALD) and then melt‐compounded to form polymer…”
Get full text

Determining the pressure dependency of the viscosity using PVT data: A practical alternative for thermoplastics by Fernández, Mercedes, Muñoz, María Eugenia, Santamaría, Anton, Syrjälä, Seppo, Aho, Johanna

“…The relation between Pressure–Volume–Temperature (PVT) and rheological behaviour of several polymers including polypropylene, poly(methyl methacrylate),…”
Get full text

ACCURATE PREDICTION OF FRICTION FACTOR AND NUSSELT NUMBER FOR SOME DUCT FLOWS OF POWER-LAW NON-NEWTONIAN FLUIDS by Syrjala, S

“…Using the high-order finite element method, we provide accurate predictions of the friction factor and the Nusselt number for the fully developed laminar flows…”
Get full text

Laminar flow of viscoelastic fluids in rectangular ducts with heat transfer: A finite element analysis by Syrjala, Seppo

“…A numerical study on the laminar flow and heat transfer behavior of viscoelastic fluids in rectangular ducts is conducted using the finite element approach. A…”
Get full text

NUMERICAL SIMULATION OF NONISOTHERMAL FLOW OF POLYMER MELT IN A SINGLE-SCREW EXTRUDER: A VALIDATION STUDY by Syrjala, Seppo

“…A recently developed approach to simulate the nonisothermal polymer melt flow in a single-screw extruder is validated against experimental data taken from the…”
Get full text