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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Sally Shady, Daniel Schmidt, Steve McCarthy, May 2011
Drug delivery vehicles in the form of nanospheres improve solubility, bioavailability and biodistribution of many pharmaceutical drugs. However, low encapsulation efficiency is a limitation that currently challenges many drug carriers. The dialysis method can be used as a technique to address this problem and enhance the apparent purity and consistency of the nanospheres being prepared. This research introduces a dialysis technique that retains 30 to 40 times more drugs of nanospheres being prepared.
Pneumatic and servo-driven ultrasonic welding of HDPE shear joints were studied. For pneumatic ultrasonic welding, the effects of weld force, down speed, and amplitude of vibration on weld strength were studied. For servo-driven ultrasonic welding, the effects of velocity, velocity profiling and collapse distance during hold on weld strength were studied. Our goal was not to optimize the welding conditions but rather compare the operation of the two systems. Both systems worked well and produced consistent welds. More work is needed with both systems to better understand the ramification of some of the controllable parameters.
This study evaluates the residual stress levels in objects molded with Eastman's Tritan copolyesters and Edgetek XT (Tritan blends with ABS) compared to molding grades of Polycarbonate and PC/ABS. A layer removal technique and chemical solvent testing are employed for stress evaluation. Both methods show that molded-in stress levels of Tritan based materials are generally 0.2-0.5X lower than levels measured in PC-based products. Additionally, testing shows that ABS has little impact on the stress levels of either Tritan or PC. These results strongly reveal why Tritan containing products exhibit excellent chemical resistance performance in a variety of market applications.
Ken Miyata, Tetsuo Abe, Hideki Tokanai, Akihiro Nishioka, Go Murasawa, Tomonori Koda, May 2011
Heat sealing is a general technique used for joining polymer film. The mechanism was not clarified. Heat seal temperature at sealed film interface is an important factor to control heat seal properties. In this study temperature profile at sealed film interface in-situ heat seal process was precisely measured by a fine thermocouple. Molecular structure development at film interface was investigated by WAXD and DSC. In heating and cooling process temperature profiles were obtained. The heating and cooling rate depended on crystallization behavior in heat sealing process. We concluded that crystallization is a major factor to affect heat seal properties.
Nicolas Ioannidis, Andizej Pacek, James Bowen, Zhibing Zhang, May 2011
The effect of ionic strength and quenching temperature on the mechanical properties and structure of agarose-based chromatographic adsorbents in micro-beads for bioseparation was investigated. The pore size/size distribution of the beads was measured by analysis of their AFM images. Their mechanical properties were determined by a micromanipulation technique based on compression of single micro-particles. It was found that the mean pore size and stiffness of agarose beads increase with ionic strength and slow cooling. These two parameters do not affect the particle size/size distribution.
Umar Mohammad, Leigh Mulvaney-Johnson, Russell Speight, Phil Coates, May 2011
The injection moulding process has a complicated set of process parameters and is subject to variations over time resulting from material, environmental and machine component changes. In order to maintain product quality it has been proven that monitoring the process signals is beneficial towards identifying possible changes in the moulded product. Here, the process signals (melt pressure, temperature and screw displacement) are utilised along with material pressure-specific volume-temperature (pvT) characteristics to estimate the moulded product mass. The successful validation of this method presented over a range of processing conditions.
Michael Muller, Beate Krause, Bernd Kretzschmar, Petra Potschke, May 2011
The influence of feeding conditions of multiwalled carbon nanotubes (MWNT), namely Baytubes C150P and Nanocyl ›NC7000, into polypropylene (PP) was investigated with respect to achieve high electrical conductivity and suitable nanotube dispersion. Both MWNT types were fed at selected concentrations either in the hopper of the twin-screw extruder or using a side feeder under otherwise same conditions (rotation speed, throughput, temperature profile). The electrical resistivity was measured on pressed plates and injection moulded samples and the state of the filler dispersion was studied using transmission light microscopy (LM). Mechanical properties, like tensile and impact strength were characterised on injection moulded samples.
This paper investigated the effect of gas content on the tensile properties and microstructure of two grades of poly (lactic acid) (PLA) that differ in terms of D-lactic acid (D-LA) content. SCF Nitrogen (N2) was used as the physical blowing agent for molding microcellular PLA tensile bars. The properties of microcellular PLA were found to be dependent upon the D-LA content. Under the most favorable conditions, high cell density and small cell size was obtained. A high cell nucleation rate and a high degree of crystallinity with different levels of D-LA enhanced microcellular structure formation at higher levels of N2.
Mohammadreza Nofar, Yanting Guo, Chul B. Park, May 2011
To simulate the evolution of the melting behavior of polypropylene (PP) during the manufacturing of expanded PP bead foams (EPP) through batch process, a high pressure differential scanning calorimeter (HP-DSC) machine was used. The EPP bead foam has two original melting peaks which are suitable for bead foams during the steam chest molding process to produce final products with well sintered beads and good firmness. The influence of various saturation temperatures, time, and pressure on the double crystal melting peak creation is investigated in this work. The results can bring an overestimation of the optimized parameters for the batch process.
Michael Kroh, Christian Bonten, Peter Eyerer, May 2011
New approaches have been done to develop the selective laser sintering process and materials. Within this process a layer to layer fusion plays an important role to achieve good bonding and part properties. This paper deals with the additive assisted laser sintering of polymers, which allows an adjustable sintering depth and independency from the optical absorption behavior of the polymer. Within this study an approach is presented to correlate the observed sintering behavior of polyetheretherketone with process and material parameters. A statistical model has been used to describe a correlation and identify the important parameters and effects within the process.
Edward Peters, Scott Fisher, Mini Jeevanath, Hua Guo, May 2011
Unique low molecular weight polyphenylene ether telechelic copolymers (PPE-M) were designed for use in thermosetting resins. Indeed, PPE macromonomers have been heralded as a breakthrough in the search for materials that broadly enhanced performance of thermoset materials. For example, the phenolic terminated macromer gave broad enhancements of performance with epoxy resins and cyanate esters. Another important class of thermoset resins involves vinyl or unsaturated monomers. Therefore, various vinyl-terminated PPE macromonomers were prepared and their performance was quantified in vinyl-based thermoset resins. The vinyl groups were allyl, methacryl, allyl hydroxyl propyl, and vinyl benzyl.
Pedro Oliveira, Sergio Amancio, Jorge dos Santos, Elias Hage Jr., May 2011
The development of new polymer welding techniques is currently a key subject in the field of science and technology of joining. Industrial sectors such as the automotive, airspace and civil engineering are examples where polymer welding is largely applied. Recently, the feasibility of the friction spot welding process was demonstrated on thermoplastics. The objective of this work was to evaluate the influence of tool material on the properties of polymeric friction spot welds on poly (methyl-methacrilate). Microstructure, lap shear resistance and fracture mechanisms of single lap joints produced with stainless steel and titanium tool materials were investigated for this purpose.
Wai Chow Chang, Eileen Harkin-Jones, Mark Kearns, Mark McCourt, May 2011
Fibre-reinforced mouldings are of growing interest to the rotomoulding industry through their outstanding price/performance ratio. However, a particular problem that arises when using reinforcements in this process is low shear, good mixing of resin/reinforcement is not optimum under those conditions. There is also a problem of the larger/heavier reinforcements segregating out of the powder to lay-up on the inner part surface. In this paper we report on studies to incorporate glass-fibres into rotomoulded parts. Results indicate that pre-compounding is necessary to gain performance enhancement and the single-layer part made from glass-reinforced, pre-compounded powder exhibited the highest tensile and flexural modulus.
Polycarbonate (PC) has become widespread in public transportation vehicles, lenses, as well as glazing due to its light weight, outstanding unique engineering properties, and extreme levels of toughness and ductility. PC is usually injection molded, or sometimes extruded and thermoformed, into desired 2D/3D complex shape, then applied with hardcoats to improve its weathering and abrasion resistance performance. The effect of molded-in stress on the brittleness and microcracking of silicone-based hardcoats during the coating process was quantified, and the impact resistance performance of weathered and aged polycarbonate samples was studied with different coating system.
Cedric Tissandier, Charles Hucault, Denis Rodrigue, May 2011
Structural composite foams were produced by enclosing a foamed core between two composite skins. The effect of layer thickness and composition was studied using different amounts of chemical blowing agent (1 and 1.5%) and flax fibres (0, 15, 30%). The samples were produced by compression molding and characterized in tension. Videos were also taken. The results show that for symmetric structures, both skins break simultaneously, whereas asymmetric foams present two consecutive skin breaks. As expected, increasing CBA content decreased all the properties, while increasing fibre content led to higher Young's modulus and lower strain at break.
Tim Gough, Adrian Kelly, Ravi Dhumal, Anant Paradkar, Sheelagh Halsey, May 2011
Near infrared spectroscopy has been used to characterize a solid dispersion of the poorly soluble antidiabetic drug glipizide in a polyethylene oxide (PEO) matrix during twin screw extrusion. A range of drug loadings and extrusion temperatures were examined. All compounds exhibited a significantly improved rate and extent of drug dissolution compared to the pure drug and physical mixtures. NIR spectroscopy was found to provide a clear indication of drug loadings, highlighting the potential to incorporate the technique into a real-time quality control system.
Polymethylmethacrylate material (PMMA) is used in several automotive exterior applications such as exterior appliques and lighting lenses. There are different grades of PMMA that are commonly used for automotive exterior applications. This paper examines the chemical resistance of different grades of PMMA that are commonly used in automotive exterior applications to automotive windshield washer fluid under different strains. The exterior automotive parts are subjected to harsh environments. The parts are exposed to a range of environmental elements such as chemicals, sunlight, rain, snow, cold and hot temperatures. This study focuses on the chemical exposure of PMMA to windshield washer fluid.
Benjamin Baudrit, Milorad Bogdanovic, Peter Heidemeyer, Martin Bastian, May 2011
In this work fundamental investigations of the weldability of wood-plastic composites (WPCs) with high proportions of fillers were conducted at the Sueddeutsches Kunststoff-Zentrum (SKZ) using a hot plate welding process. The objectives of this research work were not only to obtain investigations about suitable welding parameters and possible process optimisations in relation to the welding apparatus and the weld strength, but also to determine the achievable weld quality regarding the lack of standards and guidelines worldwide on this field. A welding apparatus for the welding of WPC parts was designed and optimized for this purpose.
Liberty Orchards is a company that makes some very sticky candies that make processing difficult. The current process requires refrigerating the candy slabs overnight and cutting the next day. By making a mold for casting the candy, the two processes would be eliminated, reducing the cycle time and the cost per part. Previous research has shown that silicone is a possible material choice. The project looked at various elastomers and fluoroadditives to reduce the surface energy of silicone. The different formulations have been tested based on the contact angle goniometer, tensiometer, water resistance, and SEM.
The intent of this study is to investigate the existence of shear imbalances when using Liquid Silicone Rubbers (LSRs) in Injection Molding. This study will compare the effects of both intra-cavity and inter-cavity shear imbalances through the use of an 8-cavity mold with a geometrically balanced runner system. A simple bar was used as the test part to investigate the existence of variation in filling patterns due to shear imbalances. The study showed through the determination of flow groups and comparison of the part weights from these groups that shear imbalances exist in geometrically balanced runners with LSR.
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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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.
