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.
Characterization of LDPE composites reinforced with granite fines demonstrates unique properties. The granite fines were compounded with LDPE powder and injection molded into tensile bars. Granite-filled LDPE had a higher tensile strength, but a lower tangent modulus and elongation than unfilled LDPE. The reduction in tensile strength can be attributed to the large size distribution of particles or agglomeration of particles that were observed in the SEM micrographs and serve as stress concentrators.
Maleic anhydride modified polypropylene was compounded with commercially available surface modified montmorillonite in an extruder. Re-compounding ensured the removal of visible tactoids from extrudate but TEM and XRD techniques showed non-uniform dispersion of clay platelets. In this study, we investigated the mechanical and fracture properties of nanoclay-filled polypropylene. Tensile strength and stiffness increased steadily with nanoclay content. The J-integral fracture resistance was also attempted on this novel material.
Monosandwich, overmolding and push-pull are special injection molding methods by which parts composed of two different materials can be produced. While the first two techniques yield structures in which the core material is totally encapsulated (monosandwich) or side surrounded (overmolding), the parts obtained via push-pull exhibit multiple oriented layers of the two materials. A comparison of the morphological developments and the flexural and impact properties induced by the three methods is made.
Kathryn J. Wright, Kishore Indukuri, Alan J. Lesser, May 2002
The origins of elasticity in thermoplastic vulcanizates have been debated for the past decade. Previous modeling attempts provide numerical solutions that make assessment of constituent concentration and interactions unclear. A microcellular modeling approach is proposed and evaluated herein to describe the steady-state deformation behavior of dynamically vulcanized blends of ethylene-propylene-diene monomer (EPDM) and isotactic polypropylene (iPP). This approach provides an analytic result including terms for composition and cure state.
We have measured the state of molecular orientation in extruded polyethylene sheet using reversion tests. This state gives rise to anisotropy in stress-deformation behaviour. A novel constitutive relation, consisting of an established large deformation, rate dependent model into which is incorporated a preoriented Gaussian network, is used to model this effect. It has been implemented within the finite element package ABAQUS and applied to large extensions of specimens at various angles to the extrusion direction.
A. Kalendova, L. Kovarova, Z. Malac, J. Malac, J Vaculik, J. Hrncirik, J. Simonik, May 2002
Modification of two types of Cloisite 30B and Na+ montmorillonite clays is made by its intercalation with polyvinylchloride (PVC) plasticizers, both low molecular and high molecular. Plate like filler particles are generated by compounding the modified clay with PVC. Plasticized PVC sheets without haze can be obtained. Morphology of such composites is evaluated with XRD and the scanning electron microscopy. The PVC nanocomposites were tested for abrasion resistance, E-modulus and flame resistance.
Density and deformation of ethylene-propylene copolymers are investigated in terms of composition and morphology. The morphology, crystallization kinetics and basic mechanical behavior are examined as a function of sample age in a previous study (1). Initial density appears to be dictated by composition and not crystallinity while changes in density are due to hexagonal crystal formation. Ductility is dependent on branching density and appears to be controlled by selective strain-induced crystallization.
Chaotic mixing produces self-similar mixing structures through repeated stretching and folding of materials interfaces, which can be exploited in processing of polymers to produce morphologies unachievable in conventional single and twin screw extrusion processes. In this study, the self similar mixing process is idealized by baker's cut, whereby materials are affinely stretched and folded or stretched, cut, and stacked. The process is repeated to produce morphology in the blending of immiscible polymer systems of polypropylene (PP) and polystyrene (PS).
On a worldwide scale, no commercial or scientific method is available for reliable, non-destructive rating of vibration welds. Industrial production depends on mechanical spot checks and statistical methods. Therefore an innovative quality concept (fundamentals: process knowledge, artificial intelligence) was developed. Since being presented at ANTEC '93 (1), it has been optimized and tested with simple specimen and complex applications. The system now enables reproducible joint strength classification, just by analyzing the vibration welding process.
In this paper we report about a research on innovative exploitation of agricultural resources.Thermoplastic biopolymers such as PLA or MaterBi can be derived from vegetal carbohydrates. Properties of biopolymers are similar to those of commodity resins; to improve their performance they can be compounded with vegetable fibers. Biocomposites are pelletized and injection molded or produced in form of mats suitable for compression molding. Possible applications in automotive field are investigated through the production of car part prototypes.
Creep properties are shown by applying a constant stress to a plastic specimen and measuring the strain as a function of time. The flexural creep of a material is related to temperature and stress effects. This study measures the effect, constant temperature has on creep properties of polycarbonate (PC) while different stresses are applied. Specifically, a heat deflection temperature testing apparatus is used to provide a constant temperature when a fixed amount of pressure is applied to the plastic.
Innovative thermoplastic vulcanizates (TPV) with high oil resistance will be described, consisting of thermoplastic polyurethanes (TPU) as matrix material and a dynamically crosslinked synthetic rubber phase. For the latter one ethylene-vinyl acetate copolymers (EVA) are used. The vulcanization step is realized by means of an organosilane crosslinking concept. For catalysis and water addition, necessary to accelerate hydrolysis- and condensation reaction, new catalyst (?Lewis acids) and water carrier systems are proposed and applied.
A three-dimensional finite element software is developed to simulate the incompressible, shear-thinning flow of thermosetting polymers coupled with thermal and curing effects. The SUPG method is used for upwind discretization of the energy equation. A control volume scheme with a fixed finite element mesh is employed to predict the fluid front advancement. The numerically predicted fluid front advancement in a microchip encapsulation cavity is compared with the experimental results.
A finite element method was used to simulate the polymeric fluid flow in multi-layer co-extrusion annular dies. New methods were proposed to update interface and node positions in the flow field during the interface updating procedure. The methods can be easily applied to the coextrusion process with no limitation on the extrusion layers. Examples are given to demonstrate the application of the updating methods. Discussions on the problems with finite element selection and path line method application are also presented.
Welding of plastic components has been playing a very essential role for system and subsystem integration of subcomponents. Ultrasonic welding process has been one of most popular welding processes for thermoplastic assembly. Effective usage of ultrasonic energy generated by the ultrasonic welding machine has been allowing various types of manufacturing processes such as welding, precision degating of molded parts, staking, seaming, embossing, ultrasonic molding, and so on. The most positive advantage of the process is the highly precise process control with a quick cycle time.
The rate of photo degradation of polystyrene in our society (Tropical Climate) has really limited its applications to mostly indoor use. This led to a wide range of research works on the effect of our Climatic condition on the photo degradation of polystyrene. Through studying and compilation of research findings and industrial informations, the primary causes, effect and factors affecting photo degradable in our society are discussed.
This paper reviews the evaluation of simultaneous through transmission infrared welding (STTIr) for joining selected under the hood applications." It was found that applications such as a brake fluid reservoirs could be effectively welded with STTIr without part marking or generation of particulates."
This keynote lecture discusses the use of biodegradable polymers as tissue engineering scaffolds. The basic principles of tissue engineering are addressed, going from scaffolds processing to some brief information on biological studies. These topics are introduced in a way that an audience composed by plastic engineers can easily became aware of the importance of the field and understands its complexity, as well as the role of biodegradable polymers on its success.
We will present a review of the world and US and Canada" demand for polyethylene and polypropylene from 2000 with a forecast to 2010. We will also look at the relative profitability of producing these resins in 2000. The polyethylene portion will be broken down into grades produced by the conventional high pressure process by the low pressure linear low density grades and high density grades.The paper will be based on 2000 data but the presentation at ANTEC will include some 2001 year end data."
Carla C. Pombo, Anunciata Conte, Maria de Fátima V. Marques, May 2002
The binary silica supported catalyst system comprising the Cp2ZrCl2 and SiMe2(Ind)2ZrCl2 metallocene compounds was prepared with different immobilization methods and evaluated at different propylene polymerization conditions. The homogeneous isolated catalysts and also the homogeneous catalyst mixture were also employed for comparison. High activities were obtained with the supported systems and the molecular weight of the produced polypropylene was invariably higher than the homogeneous precursor.
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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How to reference articles from the SPE Library:
Any article that is cited in another manuscript or other work is required to use the correct reference style. Below is an example of the reference style for SPE articles:
Brown, H. L. and Jones, D. H. 2016, May.
"Insert title of paper here in quotes,"
ANTEC 2016 - Indianapolis, Indiana, USA May 23-25, 2016. [On-line].
Society of Plastics Engineers, ISBN: 123-0-1234567-8-9, pp. 000-000.
Available: www.4spe.org.
Note: if there are more than three authors you may use the first author's name and et al. EG Brown, H. L. et al.
