SPE Library

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.

The SPE Library is just one of the great benefits of being an SPE member! Are you taking advantage of all of your SPE Benefits?

Not an SPE member? Join today!

Use % to separate multiple keywords. 

Search SPE Library
After Date: (mm/dd/yy)  
Sort By:   Date Added  ▼  |  Publication Date  ▼  |  Title  ▼  |  Author  ▼
= Members Only
Conference Proceedings
An Investigation into Collection and Recycling of Blow Moulded Motor Oil Bottles in Australia
Syed Masood, Raja Raghavan, May 2004
This paper presents an investigation on the strategies to increase the post consumer HDPE recycling of extrusion blow molded oil containers in Australia and proposes a novel oil drain rack designed to drain out the residual oil effectively from the used oil containers, based on the requirements of the clients.
Combined Effects of Temperature and Sulfuric Acid Exposure on the Degradation of Nylon 6,6
Laura-lee Brown, V.T. Bui, H.W. Bonin, May 2004
Temperature effects combined with the chemical effects of sulfuric acid on Nylon 6,6 result in significant degradation of the mechanical performance of the material. Several techniques including weight gain studies and neutron activation analysis (NAA) have permitted the calculation of diffusion coefficients and activation energies of diffusion as well as the modelling of the degradation over extended periods of time.
Melting Aspects of Filled Compounds in a Modular Co-Rotating Twin Screw Extruder
Hochul Jung, James L. White, May 2004
Polymers containing fillers are an important in the polymer compounding industry. Melting mechanisms were studied in master batched polymer compounds using an intermeshing co-rotating twin screw extruder. Calcium carbonate or aluminum powder was master batched with linear low density polyethylene. The compounds filled with particles have higher thermal conductivities and viscosities than neat polyethylene. We determined rates and mechanisms of melting of polyethylene compounds by removal and characterization of carcasses in the melting region.
Effect of Barium Sulphate on Rheological Behaviour and Mechanical Properties of Metallocene Catalysed Polyethylenes used in Medical Devices
J. Godinho, I. Moore, G.M. McNally, W.R. Murphy, May 2004
The incorporation of radiopaque barium sulphate (BaSO4) in medical tubing products is a challenge to extrusion processers. The effect of BaSO4 concentration (0-25% by weight) on the rheology and mechanical properties of three different metallocene catalysed polyethylenes were studied. The results show significant change in melt viscosity, tensile properties and phase transition (Tan ? max) with increase in BaSO4 concentration.
Effect of Isotacticity on the Simultaneous Equibiaxial Stretching of Isotactic Polypropylene Films
L. Capt, M.R. Kamal, S. Rettenberger, H. Münstedt, May 2004
A laboratory film stretcher that closely simulates the stretching conditions encountered on the industrial biaxial tenter-frame stretching process was utilized to investigate the simultaneous biaxial stretching of isotactic polypropylene films in the partly molten sate. The effects of chain tacticity of the polypropylene resins on the biaxial deformation behavior and the resulting mechanical properties were studied. Correlations were found and explained between the deformation behavior, end-film properties and the morphological characteristics of the partly molten state.
Selectivity of Extensional Viscosity Measurement under Different Conditions – Melt Elongation Versus Converging Flow
A. Göttfert, J. Sunder, May 2004
Elongational viscosity becomes more and more important due to increasing processing velocities in industrial processing. For film blowing, blow moulding and spinning process it is inevitable to consider elongational properties. The most important requirements for industrial application areFast testing with easy useHigh selectivityElongation rates similar to processingOnline measurement.Several methods of measurement have been analyzed and some are introduced on the market but not under all aspects mentioned above.First an online elongational viscosity measurement on the basis of the so called “Rheotens” is presented in this work. This method of melt elongation is then compared with converging flow method (entrance pressure loss), were different calculations of elongational viscosity are used. Different lots of polyolefine types are selected for elongational viscosity measurement. The selectivity of both methods to material differences are compared discussing measurement uncertainty.
Low-Coherence Interferometry Applied to Uniaxial Elongational Rheometry
R. Gendron, P. Sammut, M. Dufour, B. Gauthier, May 2004
The relevance of transient uniaxial elongational viscosity determination of polymers to industrial processes such as film blowing and foam extrusion is now being well recognized. Elongational rheometry is also beginning to be well documented, but it remains a delicate measurement technique, with reliability of the equipment and reproducibility of the data still being of prime concern.Recent developments in experimental evaluation coupled with state-of-the art optical techniques extend a step further the capabilities of generating reliable response in elongation, especially for large Hencky strains where dimensions of the sample being stretched is subjected to uncertainty. This paper will review the current approaches used and present a new way of monitoring in real time the true elongational response of polymeric materials, which exhibits enhancement of both the accuracy and the rapidness of the data acquisition.
An Evaluation of Elongational Viscosity of Polyethylenes Obtained from a Semi-Hyperbolic Die
D.G. Baird, J. Huang, May 2004
A semi-hyperbolic (SHPB) die attached to capillary rheometer has been proposed as a method to obtain extensional viscosity data for polymer melts at high extension rates and strains. There has been very little confirmation that data obtained from this type of device is a true measure of the extensional viscosity, ?e. Values of ?e+(transient extensional viscosity) were obtained on a Münstedt device for several polyethylenes (PE) at extension rates which overlapped with those obtained from a semi-hyperbolic die. For a highly branched PE the values obtained on a SHPB die were qualitatively in agreement with those from the extensional rheometer. However, for a linear and a sparsely branched PE the values were an order of magnitude higher than those obtained from the Münstedt device. A new analysis was carried out relating the pressure drop to the extensional viscosity which included a correction term for the variation of pressure along the die wall.
Investigation of the Predictive Capability of Advanced Differential Constitutive Equations for Polymer Melts under Different Flow Conditions
M. Zatloukal, J. Vl?ek, P. Sáha, May 2004
The predictive capabilities of three models (modified White-Metzner model, eXtended Pom-Pom model and newly proposed modification of the Leonov model) are tested for steady shear and uniaxial extensional flows of LDPE, mLLDPE and PVB melts. The input low-shear-rate viscosity data was measured on ARES Rheometrics parallel plate rheometer, whereas RH7-2 capillary rheometer was used for the determination of shear viscosity (capillary), first normal stress coefficient (slit die) and uniaxial elongational viscosity (Cogswell method). A newly proposed ‘effective entry length correction‘ has been applied to deal with all extensional viscosity data.
Ultrasonic and NIR Determination of Filler Concentration in Polymer Melt Flows in Extrusion
S. Barnes, G.D. Smith, E.C. Brown, H.G.M Edwards, P.D. Coates, May 2004
The work detailed here describes techniques for improving the accuracy of previous ultrasonic methods used in determining filler concentration (up to 20 wt.%) in polymer melt flows. Results from preliminary investigation into the application of in-line transmission Fourier Transform Near Infra red (FT-NIR) for determination of filler concentration real-time during processing is also presented.
Properties and Processing of Thermal Conductive Thermoplastics
Simon Amesöder, Gottfried W. Ehrenstein, May 2004
The increase of at least 60 Vol.-% high thermal conductive filler in thermoplastics is an innovative approach for direct adjustment of a plastic part´s heat transfer. The filler content and high thermal conductivity affects directly the flow- and cooling-conditions during injection moulding. The paper presents basic influencing variables onto processing an part properties and shows new ideas for the construction and intelligent injection moulding processtechnology.
The Effect of PIB Molecular Weight on the Cling Characteristics of Polyethylene/PIB Films for Stretch and Cling Film Applications
C.M. Small, G.M. Mc Nally, W.R. Murphy, A.H. Clarke, May 2004
The effect of molecular weight on the migratory characteristics of polyisobutylene (PIB) additive from the bulk to the surface of a range of mono-layer and multi-layer extruded polyethylene films was analysed by FTIR-ATR and peel cling analysis. Migration rates were shown to be higher for low molecular weight additive and cling strength increased as the PIB molecular weight increased.
A Rheological Model for Thermoplastic Resins Melt
Viktor V. Skatchkov, Alexandra I. Savchenkova, May 2004
A new rheological model of polymer melt was developed to describe viscosity-shear rate curves utilizing a four parameters equation based on Guassian processes approach for regression description of melt properties. Four parameters of the model (Newtonian viscosity at “zero” shear rate, viscosity and shear rate at inflection point, and dispersion of the rate of change of the viscosity) were found to be a function of polymer chain structure, molecular weight and temperature. The model provides precision description in a wide range of conditions of shear deformation of the polymer melts, solutions, blends and alloys.
Experiments in Micro-Welding of Polycarbonate with Laser Diodes
David Grewell, Avraham Benatar, May 2004
Polymer use in micro-devices, especially in the medical industry has been rapidly increasing. During assembly of micro-devices it is desirable to produce weld joints that are about 100 ?m in width. This paper reviews the use of fiber coupled laser diodes in conjunction with special lenses to produce spot sizes between 25 and 50 ?m in diameter for through transmission infrared welding technique. Studies were completed to evaluate the effect of travel speed, power density and pressure on weld quality for polycarbonate and polystyrene. It was found that process parameters are extremely critical in producing consistent welds. In addition, new testing techniques had to be developed to allow quantitative measurements to be made on weld strength due to relatively small weld area. Micrographs of the resulting welds revealed evidence of ablation at high heat inputs. Finite element analysis of the mechanical tests showed that the localized weld strength approached the yield strength of polycarbonate.
Modeling Heat Flow for a Moving Heat Source to Describe Scan Micro-Laser Welding
David Grewell, Avraham Benatar, May 2004
Polymer use in micro-devices, especially in the medical industry has been rapidly increasing. During assembly of micro-devices it is desirable to produce weld joints that are about 100 ?m in width. This paper reviews the modeling of heat flow during through transmission infrared micro-welding of plastic using fiber coupled laser diodes. Two models were used to predict temperature distributions within welded samples. Both models were based on a moving heat source and moving coordinate system. For the simpler model a moving point heat source was used and for the more complex model a Gaussian distributed heat source was used. It was found that the distributed model can accurately predict temperature fields in plastic laser welds for all ranges of the parameters evaluated. However, the point heat source model was only able to accurately predict temperature fields with a relatively small laser focal spot (25 ?m). In addition it was found that for micro-welding of plastics, when the dimensionless distribution parameter is less than two, a point heat source model predicts similar widths to those predicted by a distributed heat source model.
Measurement of Residual Stresses in Clearwelds Using Photoelasticity
Satish Anantharaman, Avraham Benatar, Nicole Woosman, Scott Hartley, May 2004
Residual stresses are detrimental to a plastic joint for a number of reasons. They lead to reduced strength and fatigue life in joints, act as stress concentrators and cause crazing, cracking when exposed to solvents. In this paper, the residual stresses in Clearweld® joints were measured using photoelasticity. This interference based technique was used in conjunction with a stress separation algorithm to quantify the maximum residual stress level and the stress distribution in the weld region. Also, the effects of process parameters like welding speed, power and ink solvents on residual stresses were evaluated. The GE solvent test was also employed for comparison with the photoelasticity results. A comparison of the residual stresses between various joining processes was also made.
Diode Laser Characterization and Measurement of Optical Properties of Polycarbonate and High-Density Polyethylene
Moonyeong Rhew, Abbass Mokhtarzadeh, Avraham Benatar, May 2004
In recent years, the use of high power diode lasers for through transmission laser welding (TTLW) of thermoplastics has increased rapidly due to the many advantages that they provide, mainly their compact size and low cost. The diode laser output can affect the heating rate and uniformity, making it important to characterize the diode laser in any welding application. In this study, diode laser bar characterization included measurement of the power efficiency, beam shape, and intensity distribution. Those measurements were performed with and without a proprietary fiber bundle provided by Branson Ultrasonics, which improved the uniformity of power intensity. In TTLW laser beam reflection, absorption and scattering as it passes through the transparent part affects the power that reaches the weld interface. Therefore, it was important to study the transmittance and reflectance of polycarbonate and high-density polyethylene. The effects of thickness and beam incident angle on transmittance and reflectance were also measured.
Applications of Polymers in Cement-Based Structural Materials
D.D.L. Chung, May 2004
Cement-based materials are widely used in the civil infrastructure. Polymers as admixtures can improve the properties, particularly in relation to water absorption reduction, toughness enhancement, vibration damping and increase of the bond strength of cement to reinforcements. Polymeric admixtures include particles, short fibers and organic liquids. Latex in the form of an aqueous particle dispersion is most common. Other than being used as admixtures, polymers are used as partial replacement of fine aggregate, for coating, sealing and repairing concrete and for coating steel reinforcing bars for corrosion protection.
Hydrosilylation of Polypropylene through Reactive Extrusion
Mercy P. Bulsari, Costas Tzoganakis, Alex Penlidis, May 2004
Hydrosilylation of terminal double bonds in polypropylene (PP) was investigated in a twin-screw extruder. This process involved two steps: i) peroxide initiated degradation, which leads to the formation of terminal double bonds and ii) the addition of siloxane compound to such bonds. FTIR was used to follow the terminal double bond formation and siloxane incorporation. The shear viscosity at different temperatures and the contact angle of the hydrosilylated PP were evaluated. The reaction was found to decrease viscosity and to improve hydrophobicity.
Measurement of Residual Stresses in Laser Welded Polycarbonate Using Photoelasticity
Satish Anantharaman, Avraham Benatar, May 2004
Residual stresses are detrimental to the strength of plastic joints. They lead to reduced strength and fatigue life in joints, act as stress concentrators and cause crazing and cracking when parts are exposed to solvents. In this paper, photoelasticity is used to measure the residual stresses in laser welded polycarbonate. Photoelasticity, an interference based technique, was used in conjunction with a stress separation algorithm to quantify these stresses along and perpendicular to the weld line. The GE solvent test was also employed to serve as a comparison to the photoelasticity results. A comparison of the residual stresses between laser welded samples and hotplate welded samples have also been made.

This item is only available to members

Click here to log in

If you are not currently a member,
you can click here to fill out a member application.

We're sorry, but your current web site security status does not grant you access to the resource you are attempting to view.

  Welcome Page

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
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.

If you need help with citations, visit www.citationmachine.net