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.
Mohammadreza Nofar, KamleshkumarMajithiya, Takashi Kuboki, Thomas Bonnet, Chul B. Park, May 2011
In this work, the feasibility of producing microcellular foam by using linear polypropylene and different nanoclay contents has been investigated. A twin-screw extruder was used for nanocomposite compounding. An X-ray diffraction machine was utilized to observe the dispersion of nanoclay within the matrix. Shear viscosity of the samples was measured as well. Also, a single screw extruder was used for foaming by using 5% supercritical CO2 in various die temperatures. SEM was utilized to explore the morphology of the foamed samples and foams with high expansion ratios of about 20 and high cell density of about 108-9 cells/cm3 were achieved.
This paper covers a failure analysis of a cross-linked polyethylene (PEX) hot and cold water plumbing system that utilized plastic insert fittings that were fastened with stainless steel clamp rings. The failed fittings exhibited features that led several different investigators to associate the failures with fatigue and slow crack growth. Our examination of the fractures indicated that the failures were due to high stress that caused crazing and subsequent fast fracture of the fittings. Environmental Stress Cracking (ESC) may also have been involved as a contributor to the failures.
Andre Rodrigues, Maria Brasileiro, Pankaj Agrawal, Edcleide Araujo, Tomas Melo, May 2011
In this work, the screw speed and the feeding rate of Polypropylene/clay nanocomposites was investigated. The nanocomposites were prepared in a co-rotating twin screw extruder under different processing conditions, and characterized by X-Ray Diffraction, mechanical properties, Optical Microscopy, Scanning Electron Microscopy and Transmission Electron Microscopy. The results showed that the Brazilian sodic bentonite clay was successfully modified with the surfactant. Higher screw speed and shear rate promoted the most favorable condition, where it was possible to obtain clay lamellae exfoliation. The mechanical properties were not influenced by the change in the processing conditions (screw speed and feeding rate).
Sung Wook Hwang, Sang Lee, Kyemin Cho, Jin Shim, Susan Selke, Herlinda Soto-Valdez, Maria Rubino, Laurent Matuana, Rafael Auras, May 2011
Poly(lactic acid) (PLA) films containing two natural antioxidants, ñ-tocopherol (ñ-TOC) and Resveratrol with various concentrations were fabricated by melt compounding and compression molding processes. The influence of the antioxidants on the optical, color and UV-VIS light transmission properties of the films was analyzed. Thermal and physical properties of films were also assessed. Films with two antioxidants showed a yellowish brown color, and the lightness was influenced by the presence of the antioxidants. Thermal properties were also significantly changed with addition of antioxidants.
Michael Zimmerman, Arash Ahmadzadegan, Anil Saigal, May 2011
It is known that a liquid crystal polymer (LCP) melt aligns in the direction of the shear flow when it passes through an extrusion die. This alignment causes thin films of the anisotropic LCP material to display different properties in different directions. To overcome this problem, many complex die design technologies have been developed that involve moving surfaces. However, there is a clear need to develop a method of predicting crystal orientation (alignment) to aid in die design. This paper investigates different modeling methods, and develops a numerical modeling technique using FLUENT.
Nick Schott, Dirk Schmiederer, Wipoo Sriseubasai, Loganathan Kaliaperumal, May 2011
One third of plastics are processed via injection molding. The process is versatile for making three dimensional parts weighing from fractions of a gram to several hundred pounds. Many types of resins are used commercially. Resins come in different colors and different additives and fillers. Changing from one resin or color to another involves an inordinate amount of money and time which is invested to remove the previous resin or color. Many commercial purging aides are available and many procedures are found in the literature miss the point since the basic principles causing the purging inefficiency are not well understood.
Viscoelastic response of polyacrylamide hydrogels prepared by free radical copolymerization of acrylamide and N,N-methylenebisacrylamide in presence of linear polyacrylamide (L-PAA) chains is investigated. The presence of high-MW L-PAA chains contributes very significantly to the intermolecular excluded volume interaction and, hence, decreases the degrees of freedom of chain strands forming the hydrogel network. This sort of trapped entanglement interaction affects significantly the network mechanical behavior. Presented viscoelastic data show that the addition of L-PAA chains into the hydrogel changes not only the linear elastic modulus of the network, but also imposes an unusual relaxation behavior in to the hydrogel.
Ryohei Koyama, Takashi Kuboki, WeiDan Ding, Babu Kamal, Nan Chen, Chul B. Park, May 2011
This paper investigates the effects of matrix type, cellulose and die temperature on the foaming behavior of cellulose fiber reinforced polylactic acid (PLA) biocomposites in extrusion. Two types of PLA (amorphous and crystalline) as a polymer matrix and CO2 as a physical blowing agent were used. The results suggest that pure crystalline PLA resulted in a better foaming behavior than pure amorphous PLA, but the polymer matrix type had little affect on the foaming behavior of the composite materials. Additionally, the cell density and the foam density of pure crystalline PLA and composites decreased with a decrease in die temperature.
Composite structures combining fabric and film are used in applications where barrier protection and moisture permeability are important. For example, protective garments require moisture permeability for the wearer's comfort, and moisture permeable protective covers for equipment to avoid condensed moisture induced corrosion or mold growth. . Recently, new ionomers having novel performance (increased selective gas transmission while maintaining mechanical properties) have been developed. In this paper, we discuss their use in film structures which have both good barrier protection,, mechanical properties and appropriate moisture transmission properties.
In this work, the effect of processing conditions and die design on die drool phenomenon for HDPE polymer melt has been investigated. It has been revealed that the thermally induced degradation occurring inside the processing equipment may lead to HDPE melt viscosity/elasticity enhancement, which promotes unwanted material accumulation at the end of the extrusion die. It has been found that for particular processing conditions, shaped die, flared die or the use of hard chrome instead of stainless steel can reduce die drool phenomenon for HDPE.
Meghan Pasquali, Jianyu Liang, Satya Shivkumar, May 2011
The template assisted method is a simple, cost effective technique that can be used to fabricate polymer nanotubes. In this study, the solution wetting technique was used to form polystyrene elongated nanostructures in anodized aluminum oxide templates. The effects of time and template pore size were studied to determine the role each parameter plays in the final morphology. It was found that for PS solutions with high molecular weight polymer, hollow nanotubes can be formed for time periods <18hr, whereas low molecular weight polymer forms solid nanorods. Additionally, relatively large pore diameters of ~200-300 nm are necessary to form nanotubes.
Supaphorn Thumsorn, Kazushi Yamada, Yew Leong, Hiroyuki Hamada, May 2011
This study considers the effects of pellet geometry on its moisture absorption and thermal decomposition kinetic of recycled polyethylene-terephthalate (RPET) and recycled polypropylene (RPP) blend. Flynn-Wall-Ozawa (FWO) was used for the kinetic study, which it was suitable for thermal degradation of RPET/RPP blend in N2 while the second order polynomial was fitted for degradation in air. Finer powders were found to have higher moisture absorption rates due to their large surface area although they could also be easily dried. Meanwhile, larger pellets exhibited higher degradation activation energies, which suggest that they are more resistant to thermal degradation than smaller grains.
Ethylene ionomers, such as Surlyn from DuPont, have long been used as packaging sealants because of their good mechanical properties and formability combined with excellent seal strength over a wide sealing temperature range, seal integrity in the presence of contamination, and hot tack. Ionomers can be modified with biosourced additives, such as fatty acids to modify their mechanical and barrier properties. In this paper we discuss blending these recently developed ionomers with commercially available ethylene copolymers to achieve films containing 20% -40% renewable content having a good balance of sealant and mechanical properties.
Wannes Sambaer, Martin Zatloukal, Dusan Kimmer, May 2011
Full 3D particle filtration modeling at low pressures considering slip/transition/free molecular flow regime, particle-fiber interactions, air/particle slip, sieve and homogenous flow field has been performed for the polyurethane nanofiber filter prepared by electrospinning process. The obtained theoretical predictions for the filtration efficiency have been compared with the corresponding experimental data and good agreement between both data sets has been obtained. In order to take all real structure features of the nanofiber filter into account (such as varying fiber diameter, curvature, inhomogeneity, defects), a new approach for 3D nanofiber mat model construction from corresponding SEM images has been proposed and utilized.
Mohammadreza Nofar, Wenli Zhu, Chul B. Park, Jed Randall, May 2011
The crystallization behavior of Polylactide with different chain extenders and nano-clay contents were investigated using a differential scanning calorimeter (DSC). The results of As Received PLAs show that the branched structure plays the role of crystal nucleating agent. Also, the compounding process on the branched PLAs improves the crystallinity significantly due to the completion of branching reactions. The results of PLA-nanoclay show that the addition of nanoclay in different loadings does not have a significant effect on melt crystallization of half and fully branched PLAs compared with processed branched PLAs, but improve the crystallinity of linear PLA during isothermal crystallization.
Lubomir Benicek, Roman Cermak, Martin Obadal, Vincent Verney, Sophie Commereuc, May 2011
The work directs attention towards the influence of natural weathering and accelerated UV degradation on resulting macroscopic properties in isotactic poly(1-butene). For this purpose, commercial-available poly(1-butene) was extruded as tape. Two sets of prepared specimens were UV irradiated up to 300 hours and naturally weathered up to 103 days. Significant changes were consequently observed in evolution of mechanical properties where was observed a drop of tensile strength and elongation at break, while tensile modulus shows different trend caused by phenomenon of chemicrystallization. Evolution of chemical species in specimens was observed using infrared spectroscopy and surface changes were observed by stereomicroscopy.
Satoshi Nagai, Akira Itou, Patcharat Wongsriraksa, Kazushi Yamada, Yew Leong, Hiroyuki Hamada, May 2011
Polymer blend or alloy provides the good mechanical performances and thermal properties. However, the different kinds of polymers are immiscible, which indicated by phase separation structure and declination of mechanical properties. In this study, we investigated the miscibility of various ratio of POM/PLA blends and their effect on thermal and mechanical properties of POM/PLA blends. The miscibility of POM/PLA blends could confirm by single melting temperature and no phase separation. The incorporation of PLA into POM significantly affected both thermal and mechanical properties, which could be attributed to the embedding of submicron PLA domains amongst the amorphous regions of POM.
In this work, non-isothermal film blowing process analysis for non-Newtonian polymer melts has been performed theoretically by using a minimum energy approach and the obtained predictions were compared with both, theoretical and experimental data (internal bubble pressure, take-up force, bubble shape, velocity and temperature profiles) taken from the open literature. For this purpose, recently proposed generalized Newtonian fluid depending on three principal invariants of the deformation rate tensor, D, and its absolute defined as square root of D*D has been used. It has been found that film blowing model predictions are in very good agreement with the corresponding experimental data.
Crystal morphologies of LLDPE and its miscible blends with HDPE obtained by water-assisted injection molding (WAIM) and conventional injection molding (CIM) were examined. Banded spherulites formed in both WAIM and CIM pure LLDPE parts. In CIM parts, a clear banding to non-banding morphological transition occurred for LLDPE upon blending with HDPE. However, for WAIM parts, banded spherulites of LLDPE still formed in outer and inner zones upon blending with HDPE, but the bands became irregular. In core zone of WAIM parts, a clear banding to non-banding morphological transition for LLDPE was observed when HDPE content was increased to 30 wt%.
Meng-Hsin Tsai, Long Jiang, Michael Wolcott, May 2011
Polyhydroxybutyrate (PHB)-based wood plastic composites (WPCs) are superior to ordinary petroleum-based WPCs in terms of environmental protection. However, PHB is more expensive than many of the commodity petrochemical polymers because of the costly separation and purification processes, which could be avoided by directly using PHB-laden bacteria to produce PHB-based WPC. This study investigated the processing parameters, mechanical properties, and water resistance of the extruded composites with varying component ratios. The results indicate that some of the composites had outstanding properties compared with a commercial WPC. Therefore, this renewable WPC can replace petroleum-based WPCs on current markets without sacrificing product performance.
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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