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.
M. Zatloukal, K. Chaloupkova, D. Hertel, H. Münstedt, May 2007
The vortex development of a low-density polyethylene in different flat dies under various processing conditions has been analyzed by the Finite Element Method employing the modified White-Metzner model as constitutive equation. The theoretical results are compared with the velocity distributions measured by Laser-Doppler Velocimetry (LDV).
W.-J. Boo, L. Y. Sun, S.-M. Lee, E. Moghbelli, G. Warren, A. Clearfield, H.-J. Sue, May 2007
The structure-property relationship of a set of model polymer nanocomposite systems has been investigated. The findings suggest that degree of exfoliation and aspect ratio of nanoplatelets in polymer matrices can greatly influence physical, mechanical and rheological behaviors of polymers. Most importantly, there appears to be a limit to which polymer nanocomposites can be applied for structural applications.
The effect of long chain branching in polyvinylidene fluoride in extrusion blow molding is investigated in light of the enhanced rheological properties. The presence of long chain branching increased the melt strength; melt elasticity and strain hardening of the branched samples as opposed to their linear counterparts. These enhanced properties suggest better sag resistance during blow molding and higher blow-up ratio while achieving uniform wall thickness.
In this work, specially designed zero-length dies were used for the entrance pressure drop measurements with the aim to determine uniaxial extensional viscosity of polyolefin melts by using effective entry length correction and Cogswell/Binding models and the results were compared with the extensional rheology determined with the Sentmanat extensional rheometer. Reasonable agreement between these two techniques has been obtained.
A blend of two polycarbonate copolymers, high-heat poly(ester-carbonate) (PEC) and polycarbonate-polydimethylsiloxane copolymer (PC-PDMS) provided an opaque, pearlescent blend. However, when a transesterification catalyst was used, the blend becomes miscible and translucent/transparent. The high-heat, ductile (HHD) materials were analyzed for a range of properties including optics, rheology, heat performance, flame retardance, and mechanical properties. The hydrolytic stability of the HHD materials was also measured by comparing the ductility of the blends before and after autoclaving.
Charles L. Rohn, Eric Bennett, Fred Mazzeo, May 2007
Heterogeneous polymers represent an important class of plastics that comprise polymer blends, alloys, and fiber or mineral filled plastics. The rheology of these melts is dominated by the transient morphology that is produced during fabrication into finished products. Standard laboratory rheological tests do not take into account morphology. Combined measurements of a capillary viscometer and controlled stress rotational rheometer can provide a better understanding of the processing behavior of these complex rheological plastics
It is widely recognized that molecular weight distribution (MWD) is an important factor affecting the rheological behavior of polymer solutions. In this contribution, the effects of MWD on the formation of electrospun polystyrene fibers in THF have been studied. The results are compared with the monodisperse system. The importance of chain entanglements attributed to high molecular weight component within the polydisperse system has been acknowledged. Concentrations for the incipient as well as stable fiber formation in a polydisperse system may be predicted.
Jason D. Conrad, James P. Eickhoff, Graham M. Harrison, May 2007
Over the past decade, considerable interest has emerged in replacing conventional fossil fuel-based polymers with bio-derived polymers. Two bio-derived polymers that have garnered significant interest are PHA and PLA. In this study, shear and extensional rheology, coupled with degradation studies using GPC, are used to investigate the flow properties of blends of these two polymers. The development of blends with tailored flow and thermal/mechanical properties is pursued.
The effect of sparse long-chain branching on extensional rheology is analyzed for metallocene-catalyzed polyethylene resins with varying degrees of branching. The onset of extensional strain hardening distinguishes the degrees of branching while such distinctions are not apparent in shear flow behavior.
P. Gupta, S. Costeux, T. Oswald, Y.W. Cheung, L. Weaver, S. Karande, S. Chum, May 2007
The melt rheology of novel Olefin Block Copolymers (OBCs), recently developed by The Dow Chemical Company, was investigated. The melt shear rheology of OBCs was found to be characteristic of linear random copolymers of ethylene and __olefins. Furthermore, the melt rheology can be modified to target certain specific application areas by chemical means or by blending with traditional polyolefins with broader molecular weight distributions or those containing long chain branching.
Youngjoon Ahn, Hyukrok Kwon, Kee-Kahb Koo, Jae Wook Lee, Hyounsoo Kim, May 2007
Highly filled polymeric materials exhibit complex rheological properties. In this study the rheological characteristics of highly filled suspension based on ethylene octane copolymer binder and Dechlorane filler were studied. Steady shear and thixotropic behaviors are discussed.
Sulfonated polystyrene ionomers (alkali metal salts) with molecular weight below the entanglement molecular weight of polystyrene were prepared. The rheological behavior of the ionomers was characterized by dynamic and steady-state shear experiments. In general, the viscosity of the ionomers increased with sulfonation level and as the size of the cation decreased. Whereas, the starting polystyrenes were Newtonian fluids, the ionomers were non-Newtonian and viscoelastic.
Rheological and thermal characteristics of PBT resins were investigated with potential applications in low density foaming. The branched PBT was produced by extrusion modification with a tri-functional modifier, whereas the linear PBT was processed under the same condition without the modifier. The presence of branched molecules resulted in increased elasticity and slower crystallization kinetics due to higher concentration of entanglements and/or increased interchain interactions. Degradation by processing for both resins produced shorter chains, and involved reduced shear viscosity and faster crystallization kinetics, in particular, at high temperature.
The extrusion technology of plastic profile with metal insert is recently an advanced plastic processing method. However, its mechanism research work is lagging behind. In this paper, we developed the mathematical model of the extrusion process and simulated the three-dimensional complex flows in the extrusion die by the finite element method based on the CFD theory. The change of the melt rheological properties versus different processing conditions was investigated and some practicable advice on the process operation was accordingly put forward.
Wholly aromatic polyester, LCP, was blended with PET to produce self-reinforced composites using an ultrasonically assisted single screw compounding extruder. Ultrasonic intensity was varied to induce in-situ compatibilization in the blends and was found to decrease pressure, and affect morphological, rheological and mechanical properties. PET and LCP homopolymerization, as well as their copolymerization through possible esterification/ transesterification reactions leading to an increase in their viscosities and mechanical properties was observed in the melt state under certain conditions.
Velichko Hristov, Fahim Ahmed, Elizabeth Takács, John Vlachopoulos, May 2007
The influence of coupling agents on the melt rheological properties of HDPE/wood flour composites has been investigated in this work by means of a capillary rheometer. Scanning electron microscopy was also employed to supplement the rheological data. It was found that molecular weight and molecular weight distribution of the polymer matrix and coupling agent characteristics influence the melt flow properties of the filled composites. Generally, low molecular weight and narrow molecular weight distribution polyethylene matrix provides larger increase of the viscosity of the composites with respect to the unfilled resin. Coupling agents tend to increase the resistance to shearing, but wall slip effects may interfere with the measured values, especially at very high filler loadings.
Poly(lactic acid) (PLA) and Polyhydroxy octanoate (PHO) were melt blended using a torque rheometer in the ratios of 80/20, 60/40, 50/50, 40/60, and 20/80. In this study, the rheological, thermal, and mechanical properties of the blends were investigated. Differential scanning calorimetry showed that the two components in these blends were found with two crystalline phases and two amorphous phases confirming the coexistence of two immiscible components. The addition of modified PHO in PLA increased the toughness of the PLA and increased the elongation to break more than 158%. Results obtained from rheological test indicated that the melt viscosities of PLA/modified PHO decreased as a function of modified PHO content.
Caroline Woelfle, Kurt Koppi, Stephane Costeux, Todd Hogan, Joe Dooley, Ronald Van Daele, Alexander De Bokx, Alexander Droste, Sjoerd De Vries, Jerome Claracq, Berend Hoek, Rudi Salmang, May 2007
The difference in thermoforming processability of three STYRON* high-impact polystyrene (HIPS) resins was investigated. Experiments were performed on a moldbottle thermoformer as well as a step-case tool thermoformer. Disparities observed were analyzed in terms of differences in rheological properties of the resins. Conclusions were drawn as to which rheological characteristics the resins should possess in order to give the largest temperature processing window coupled with high quality thermoformed parts.
Qian Qin, Gregory B. McKenna, Xiangfu Shi, May 2007
We describe results for experiments in which a novel rheological technique is applied to a styrene-isoprene-styrene triblock copolymer in the vicinity of the order-disorder transition. Mechanical Hole Burning Spectroscopy (MSHB) was developed to probe dynamic heterogeneity in polymers. In this technique, a large amplitude oscillatory strain (LAOS) is imposed on a sample as a perturbation, and is followed by a small step strain. The relaxation response is then compared with that without the LAOS perturbation. It has been assumed that mechanical holes for heterogeneous systems. For homogeneous systems no hole would result. Here the heterogeneity of a tri-block copolymer was investigated in the vicinity of its order-disorder transition and it was found that the mechanical hole intensity gradually decreases as the phase boundary is approached from the ordered regime. At the one-phase or the disordered region, no apparent holes were observed.
Thermoplastic polyurethanes (TPU) based on aliphatic diisocyanates such as 4,4'-dicyclohexylmethane diisocyanate (H12MDI) are indispensable in a variety of industrial, optical, and medical device applications. Relative to 4,4'-diphenylmethane diisocyanate (MDI) based TPUs, H12MDI based TPUs exhibit superior aesthetics, light stability, and biocompatibility. However, the use of H12MDI as a diisocyanate has a major impact on other properties of the final TPU. In this study, the thermal, mechanical, and rheological properties of a typical H12MDI based TPU were characterized and compared to an analogous MDI based TPU.
Kim McLoughlin Senior Research Engineer, Global Materials Science Braskem
A Resin Supplier’s Perspective on Partnerships for the Circular Economy
About the Speaker
Kim drives technology programs at Braskem to develop advanced polyolefins with improved recyclability and sustainability. As Principal Investigator on a REMADE-funded collaboration, Kim leads a diverse industry-academic team that is developing a process to recycle elastomers as secondary feedstock. Kim has a PhD in Chemical Engineering from Cornell. She is an inventor on more than 25 patents and applications for novel polyolefin technologies. Kim is on the Board of Directors of SPE’s Thermoplastic Materials & Foams Division, where she has served as Education Chair and Councilor.
A Resin Supplier’s Perspective on Partnerships for the Circular Economy
About the Speaker
Gamini has a BS and PhD from Purdue University in Materials Engineering and Sustainability. He joined Penn State as a Post Doctorate Scholar in 2020 prior to his professorship appointment. He works closely with PA plastics manufacturers to implement sustainability programs in their plants.
A Resin Supplier’s Perspective on Partnerships for the Circular Economy
About the Speaker
Tom Giovannetti holds a Degree in Mechanical Engineering from The University of Tulsa and for the last 26 years has worked for Chevron Phillips Chemical Company. Tom started his plastics career by designing various injection molded products for the chemical industry including explosion proof plugs and receptacles, panel boards and detonation arrestors for 24 inch pipelines. Tom also holds a patent for design of a polyphenylene sulfide sleeve in a nylon coolant cross-over of an air intake manifold and is a Certified Plastic Technologist through the Society of Plastic Engineers. Tom serves on the Oklahoma Section Board as Councilor, is also the past president of the local Oklahoma SPE Section, and as well serves on the SPE Injection Molding Division board.
Joseph Lawrence, Ph.D. Senior Director and Research Professor University of Toledo
A Resin Supplier’s Perspective on Partnerships for the Circular Economy
About the Speaker
Dr. Joseph Lawrence is a Research Professor and Senior Director of the Polymer Institute and the Center for Materials and Sensor Characterization at the University of Toledo. He is a Chemical Engineer by training and after working in the process industry, he has been engaged in polymers and composites research for 18+ years. In the Polymer Institute he leads research on renewably sourced polymers, plastics recycling, and additive manufacturing. He is also the lead investigator of the Polyesters and Barrier Materials Research Consortium funded by industry. Dr. Lawrence has advised 20 graduate students, mentored 8 staff scientists and several undergraduate students. He is a peer reviewer in several journals, has authored 30+ peer-reviewed publications and serves on the board of the Injection Molding Division of SPE.
Matt Hammernik Northeast Account Manager Hasco America
A Resin Supplier’s Perspective on Partnerships for the Circular Economy
About the Speaker
Matt Hammernik serves as Hasco America’s Northeast Area Account Manager covering the states Michigan, Ohio, Indiana, and Kentucky. He started with Hasco America at the beginning of March 2022. Matt started in the Injection Mold Industry roughly 10 years ago as an estimator quoting injection mold base steel, components and machining. He advanced into outside sales and has been serving molders, mold builders and mold makers for about 7 years.
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