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Showing 1 to 13 of 13 for “"melt rheology"”.
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Synthesis and Characterization of Poly(arylene ether sulfone)s with Novel Structures and Architectures
… were characterized by NMR, SEC, DSC, TGA, melt rheology and tensile tests. The melt viscosities of these polymers in the high frequency region were lower than the control while the stress-strain properties were comparable to those of the control, suggesting that it is possible to reduce the …
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On-line shear and extensional rheometry of polymer melts in the extrusion process.
… and extensional characteristics of polyolefin melts during twin screw extrusion (TSE). Comparisons with off-line rheometry were made using a twin-bore capillary rheometer and a modular in-line slit die rheometer (ILR) provided in-line rheometry comparisons. Both capillary rheometers were …
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On-line shear and extensional rheometry of polymer melts in the extrusion process.
… and extensional characteristics of polyolefin melts during twin screw extrusion (TSE). Comparisons with off‑line rheometry were made using a twin‑bore capillary rheometer and a modular in‑line slit die rheometer (ILR) provided in‑line rheometry comparisons. Both capillary rheometers were …
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From N to P: Examining Structure-Property Relationships of Ammonium- and Phosphonium-Containing Macromolecules
… low glass transition temperatures, unprecedented melt rheology studies on polyelectrolytes probed the melt flow characteristics of phosphonium ionenes. Novel phosphonium gemini surfactants displayed interesting solution properties in aqueous and chloroform solutions. Electrospinning of the …
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Non-Covalent Interactions in Polymeric Materials: From Ionomers to Polymer Blends
… noted for phosphonated ionomers by a dynamic melt rheology study. Compared to the ionic aggregates generated from sulfonate groups, larger ionic aggregates with associated phosphonate groups have been observed. Furthermore, phosphonated ionomers displayed significantly higher glass transition …
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In situ composites of compatibilized polypropylene/liquid crystalline polymer blends
… fill time, mold thickness, mold temperature and melt temperature were investigated in three molds of different thicknesses. Different processing relationships were found between the LC copolyesters and the LC poly(ester-amide). For the former LCP blends, the highest moduli were obtained from the …
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Toughening of cyanate ester networks with reactive thermoplastic modifiers
… dependent kinetics of cure as well as melt rheology. It is expected that these models will consequently complement efforts in establishing an optimized cure protocol for the fabrication of composite panels. Preliminary studies concerning aspects of fiber-matrix interfacial adhesion and …
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Living Polymerization for the Introduction of Tailored Hydrogen Bonding
… were synthesized and characterized. The melt phase properties were investigated using melt rheology and the effect of macromolecular topology and multiple hydrogen bond functionality was investigated. Linear UPy functional poly(ethylene-co-propylene)s exhibited increased viscosity and …
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Processing-Structure-Property Studies of: I) Submicron Polymeric Fibers Produced By Electrospinning and II) Films Of Linear Low Density Polyethylenes As Influenced By The Short Chain Branch Length In Copolymers Of Ethylene/1-Butene, Ethylene/1-Hexene & Ethylene/1-Octene Synthesized By A Single Site Metallocene Catalyst
… conventional fiber spinning processes based on melt and solution spinning. As a result, the electrospun fibers have a very high specific surface. The research efforts discussed in Part I of this dissertation relate to some fundamental as well as more applied investigations involving …
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Novel Monomer Design for Next-Generation Step-Growth Polymers
… (Tg), tensile strain-at-break, zero-shear melt viscosity, average hole-size free volume, and the plateau modulus prior to viscous flow during dynamic mechanical analysis (DMA). The 3,3'-PEI composition interestingly exhibited a ~20 °C higher Tg than the corresponding 4,4'-PEI analog. …
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Design of Functional Polyesters for Electronic and Biological Applications
Melt polymerization and novel monomers enabled the synthesis of polyesters for electronic and biological applications. Inspiration from nature and a passion for environmental preservation instigated an emphasis on the incorporation of renewable resources into polymeric materials. Critical analysis …
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Step-Growth Polymerization Towards the Design of Polymers: Assembly and Disassembly of Macromolecules
… diimide units within the polymer backbone. Melt transesterification offered a facile method for the synthesis of o-nitro benzyl ester-containing polyesters. ¹H NMR spectroscopy confirmed the structures of the photoactive polyesters and size exclusion chromatography confirmed reasonable …
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In-line process measurements for injection moulding control. In-line rheology and primary injection phase process measurements for injection moulding of semi-crystalline thermoplastics, using instrumented computer monitored injection moulding machines, for potential use in closed loop process control
In-line rheological and process measurements are studied, during the primary injection phase, as a potential aid to closed loop process control for injection moulding. The feasibilities of attaining rheological and process measurements of sufficient accuracy and precision for use in process control …