SPE Library
The SPE Library contains thousands of papers, presentations, journal briefs and recorded webinars from the best minds in the Plastics Industry. Spanning almost two decades, this collection of published research and development work in polymer science and plastics technology is a wealth of knowledge and information for anyone involved in plastics.
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Rheology
SPE Library content related to rheology
Effects of pressure and gases on viscosity of molten plastics
A high-pressure sliding-plate rheometer provides an attractive alternative to conventional instruments for measuring the impact of pressure and dissolved gases on polymer behavior.
Rheological structure of silver nitrate micro-emulsions
Bicontinuous aqueous micro-emulsions exhibiting Newtonian behavior and low viscosity are suitable for silver-nanoparticle synthesis.
Nanocomposite dispersions based on cellulose whiskers and acrylic co-polymer
Addition of methacryloxypropyl triethoxysilane stabilizes the dispersion and favors anchoring of the whiskers onto polymer particles.
Using a torque rheometer to characterize flow in poly(vinyl chloride) composites
An instrument that is basically a batch mixer provides valuable data regarding the processability of polymer micro- and nanomaterials, and is also a useful tool in quality control and product development.
Mechanical characterization of hydrogel
Digital image correlation is a viable approach to noncontact deformation sensing.
Reactive compatibilization of polymer blends
The rheology and morphology of uncompatibilized and reactively compatibilized blends of polytrimethylene terephthalate and ethylene propylene diene monomer correlate strongly.
Compatibilizers improve exfoliation in polymer-clay nanocomposites
Melt viscosity, measured by capillary rheometry, indicates the degree that exfoliation is improved by adding maleated polyethylene compatibilizers to polyethylene-nanoclay composites.
Predicting flow and temperature effects on polymer crystallization
Simulating crystalline microstructure development under various thermal and mechanical conditions provides an essential step towards determining the final properties of injected parts.
Stronger high-density polyethylene
Differential-scanning-calorimetry measurements show that nanocomposites containing barium sulfate have a more perfect crystalline phase.
More efficient manufacture of controlled-rheology polypropylene
Polymer formation of a certain molecular weight can be predicted with careful control of reaction conditions.
Nanotalc improves properties of polyamide-6 binary and ternary nanocomposites
Nanotalc is more easily exfoliated than nanoclay through melt blending and forms extended, networklike structures and improved tensile strength, modulus, and flow in polyamide-6.
Phase coalescence impacts rheology and birefringence of polymer blends
A new phase-morphology development explains significant viscosity and birefringence drops following melt processing.
Effect of fountain flows on injection-molding-induced morphology
In injection molding of polypropylene, extensional deformation at the advancing flow front causes high birefringence near the surface.
Thermoforming poly(methyl methacrylate) transparencies
Numerical simulations enable prediction of the properties of polymer transparencies that are thermoformed near their relevant glass-transition temperature.
Viscoelasticity, tackiness, and extrusion flow of block copolymers
The dominant rubbery state in high-molecular-weight thermoplastic elastomers leads to a lack of adhesion and a plug flow.
Interaction of normal and shear stresses in an epoxy polymer
Superimposed cyclic tension or shear stress increases time-dependent deformation, while constant stress accelerates accumulation of ratcheting strain in cyclic tension or shear loading.
Blending sequence effects on rheological properties of ternary composites
The differing compatibilities of organoclay, thermotropic liquid crystalline polymer, and polyethylene produce a range of structural and flow behaviors in their blended forms.
DYNAMIC CHARACTERISTICS OF PLUG ' ASSIST THERMOFORMING
Plug-assist thermoforming is a well known technique in polymer processing due to its interesting features. The dynamic value of driving-force for the stretching process is determined based on equilibrium equation. This amount of force is required for applying to a plug in order to stretch a sheet. It is used for calculation of the required theoretical work, and power of a plug-assist thermoforming process. By using a non-linear viscoelastic rheological model in the proposed mathematical model, its validity was examined by performing experimental tests on ABS sheets.
PROCESSING AND PERFORMANCE OF HDPE POLYMER BLENDS INCLUDING POST CONSUMER RECYCLED HDPE
With the rapid increase in the market for recycled polyethylene from various sources, there is an urgent need to quantify the performance of these materials. Blends of recycled high density polyethylene (HDPE) were prepared to obtain specific mechanical properties and MFI. The results show that the MFIs had significant effect on the rheological, mechanical and phase morphology characteristics of the various blends.
DEFORMATION AND FRACTURE MECHANISMS IN POLYETHYLENE / CLAY NANOCOMPOSITES
Polyethylene/montmorillonite nanocomposites based on LDPE, HDPE and LLDPE of similar rheological properties were prepared and mechanically tested in tension mode. It was shown that nanocomposites based on LLDPE exhibit a very peculiar behavior, with a significant improvement in toughness (elongation at break). The microstructural features of the various nanocomposites were investigated through scanning and/or transmission electron microscopy. Based on those observations, an explanation for the deformation and fracture mechanisms in LLDPE/montmorillonite nanocomposites was proposed.
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