Rheology

Get control of polymer processing by understanding the rheology!

Rheology is the science that studies the deformation and/or flow behavior of liquids and solids. Polymers in the solid or in the liquid (molten) state that respond  to an external force (stress) by deformation can be measured at the Senbis laboratories. In order to do so we have a range of equipment and methods available. We can advise you about the right equipment and method in order to analyze your materials and elucidate the reological properties.

The rheological properties of polymeric materials are important to know for a good performing end application and are key for good processing.

Overview of available equipment, analyses and standards

Available equipment Standard Description
Rotational rheometer (Brookfield) User defined e.g. for liquids and slurries
plate-plate (oscillary) rheology Low shear range
Capilary rheology (Göttfert) Intermediate shear range
Extrusion rheology (Haake Polylab) User defined High shear range
Extensional rheology (Göittfert)
Ubbelohde (solution) viscometry PLA, PEF, PBT, PET, PA
Melt flow Index, melt flow rate (ASTM D1238, ASTM D3364, ISO 1133)
Dynamic mechanical analyses (DMA)

Most polymeric materials respond non-Newtonian to external applied stresses, meaning that the apparent viscosity is non-linear with the applied stress: most often the apparent viscosity decreases with increasing stress (a phenomenon called shear thinning) due to the alignment of polymer chains at high shear rates. Moreover, polymeric materials may behave viscoelastic and the deformation can be split up in two parts:

  • Viscous deformation is irreversible (deformation is permanent after removing the external stress). The viscous deformation is accompanied with an energy loss by dissipation of heat. The viscous part of deformation can be quantified by the loss modulus (G’’).
  • Elastic deformation is reversible (material returns to the original state after removing the external stress). The elastic component can be quantified by the storage modulus (G’).

The loss and storage modulus of a material can be measured by applying an oscillatory shear and can be conducted in the solid state as well as in the liquid state (polymer melt).

Contact us

SPIC-Emmen
Eerste Bokslootweg 17
7821 AT Emmen
The Netherlands

+31 591 69 2117
info@spic-emmen.com

Dynamic mechanical analysis (DMA)

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Polarized light microscopy

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Birefringence measurement (Sénarmont method)

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Purity Scanner PS25C

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Film Surface Analyser FSA100

read more fsa100

Zwick uni-axial displacement test – (e.g. tensile and compression)

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Vicat/HDT Softening temperature

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VWR Venti-line drying Oven

read more Venti-line oven

Shore hardness durometer

read more Shore hardness

Moisture content measurement

read more Moisture content measurement

Zwick Melt Flow Index Tester

read more Melt Flow

Impact strength measurement system

read more Impact strength polymer analysis

Density measurement

read more Density measurement polymer

Oxygen Bomb Calorimeter

read more bomb calorimeter

Ash Content Analysis

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Yarn friction measurements

read more yarn friction polymer meter

NMR (Nuclear Magnetic Resonance)

read more NMR polymer analyses

Dynamic Vapour Sorption

read more Dynamic vapour sorption (DVS) polymer

Yarn evenness (mass deviation)

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XRD (X-Ray Diffraction Analysis) Analysis Polymer

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Vacuum polymer drying

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Ubbelohde viscometer polymers

read more ubbelohde viscometer polymer

Twist counter of Multifilament Yarns

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TNF measurements (temperature nuclei free)

read more TNF measurements polymer

Time to failure method for polymer yarns

read more time to failure polymer

Spin finish content determination of polymer yarns

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Solid state polymerization (SSP) rotary evaporator

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Shrinkage hot air (SHA), free shrinkage of Polymer Yarns

read more Shrikage Hot Air analyses polymer

Shrink force of Polymer Yarns, (R)HASF

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Rheometrics Dynamic Spectrometer (RDS)

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Using Refractive index during Condensation Polymerizations

read more Refractive Index

Pulse propagation method (PPM) for sonic modulus

read more PPM (Pulse propagation method) Polymer

Polycondensation autoclave (1kg)

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Partisol (Particles In Solution)

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MFI & MVR (Melt Flow Index & Melt Volume Rate)

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Mechanical properties of yarns and filaments

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Liquid immersion density

read more liquid immersion desity polymer

Linear density measurement of polymer yarns and cords

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Laboratory scale SSP equipment

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Isothermal DSC

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Hyper DSC (up to 500K/min)

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Hot water shrinkage (HWS)

read more hot water Shrinkage polymer

Hot stage microscopy (HSM)

read more Hot stage microscope liggend polymer

Hot air shrinkage (HAS) of polymer yarns and cords

read more Hot Air Shrinkage Polymer

Heat capacity polymer determination

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Haake Polylab Rheotens

read more haake rheotens polymer

Haake Polylab Kneader

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Haake Polylab Filmcasting

read more Haake filmcasting polymer

Haake Polylab Filmblowing Polymer

read more haake filmblowing polymer

Haake Polylab Filament Extruder

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FTIR (Fourier Transformation Infrared Spectroscopy) Polymer

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Rothschild polymer yarn entanglement tester

read more Rothshild entanglement rester polymer

DMA – Dynamic mechanical analysis Polymer

read more DMA Polymer

Differential Scanning Calorimetry Polymer (DSC)

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Davenport density gradient column

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Filament Count and cross section analyses

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Capillary rheometer Göttfert

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Brookfield Rheometer

read more Brookfield Rheometer Polymer

Birefringence measurement of yarns (Sénarmont method)

read more Birefringence polymer yarns