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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Peter J. Martin , Hui Leng Choo , Chin Yong Cheong , Eileen Harkin-Jones, May 2010
The plug-assisted thermoforming process is the largest and most important industrial thermoforming process. The main aim of this study was to investigate the interaction between the properties of the plug and the polymer sheet in thermoforming. Non-isothermal plug only thermoforming tests were carried out using identical plug designs for various combinations of plug and sheet materials. It was hoped that this study would help to improve the understanding of friction and heat transfer effects during the thermoforming process. The plug materials used included: Hytac-B1X (thermoplastic syntactic foam), Hytac-WFT (epoxy syntactic foam with added Teflon), Blue Nylon, and POM (polyoxymethylene). The sheet materials included aPET and polystyrene (HIPS). It was found that the magnitude of slip during plug contact was much higher with aPET than with HIPS and that this reduced as the temperature of the plug was increased. Different plug materials produced significantly different wall thickness distributions in the preforms. It was concluded that friction was the dominant effect during contact.
Kurt A. Koppi, Berend Hoek, Jack Little, Weijun Zhou, May 2010
Thin-wall injection molding experiments and mold filling analysis were performed on four Cyclic Block Copolymer (CBC) resins. These materials are substantially fully hydrogenated styrenic block copolymer and they represent a class of optical polymers with excellent light transmittance and unique birefringence properties. These resins are currently under development for various optical applications including injection molded light guide panels and lenses. The thinwall injection molding behavior and impact performance of the four CBC resins was compared to a competitive polymethylmethacrylate (PMMA) resin.
R. A. Pearson , L. N. Bacigalupo , Y.L. Liang , B. T.-Marouf , R. K. Oldak, May 2010
A poly(styrene ' butadiene ' methyl methacrylate) triblock copolymer (SBM) and a poly(methyl methacrylate ' butylacrylate ' methyl methacrylate) triblock copolymer were investigated as a toughening agents for a ductile epoxy resin. A carboxyl acid terminated copolymer of butadiene-acrylonitrile (CTBN) was used as a control (conventional toughening agent).The use of CTBN resulted in micron-size rubber particles (c.a. 3 microns diameter) and the use of SBM and MAM resulted in spherical, nanometer size rubber particles (c.a 40 nanometers in diameter). Interestingly, the SBM modifiers were found to be more effective toughening agents at high rubber contents. Scanning electron microscopy attributes the increase in toughness due to extensive matrix dilation and transmission optical microscopy suggests that more energy is dissipated per unit volume for the SBM modified epoxy.
This paper presents the redesign of two polymer processing lines involving, in the first case, a 90 mm screw design with a barrier zone and an elongational mixing unit for the manufacturing ofPP double wall sheet. A new flat die geometry was also required. The new components needed to solve homogeneity problems and grammage variations.
In the second case, a 50.8 mm- screw design with a barrier zone and a removable mixer was required for the production of thin wall containers using a 150 ton injection molding machine. A ring non-return valve was designed to assure parts reproducibility and to avoid leakages.
Sunny Modi , Kurt koelling , Yael Vodovotz, May 2010
PHB (Poly (3-hydroxybutyrate) families of naturally occurring polymers are extracted from micro-organisms.PHB behaves similarly to conventional thermoplastics, yet are fully biodegradable in common composting conditions.To improve flexibility for potential food packaging applications, PHB can be synthesized with various copolymers such as 3-hydroxyvalerate (HV). The objective of this study was to characterize the thermal and rheological properties of PHB synthesized with various valerate contents and relate these findings to potential food packaging applications.
M. Umar, L. Mulvaney-Johnson, R. Speight, P. Brincat, A. Bakharev, P. D. Coates, May 2010
Urethane based thermoplastic elastomers (TPU) have an impressive range of performance characteristics such as outstanding scratch/abrasion resistance, excellent oil resistance and high tensile and tear strengths. However, application of TPUs is limited when low hardness (<70 A) is required. Soft TPU materials with low level of hard segment are difficult to process. Commercially, low hardness products are produced by adding phthalate plasticizers, which are not desirable in some applications. The objective of this project is to study TPU hardness modification using styrenic block copolymers to achieve soft TPU alloys without significantly sacrificing other physical properties.
M. Umar , L. Mulvaney-Johnson , R. Speight , P. Brincat , A. Bakharev , P. D. Coates, May 2010
A methodology is presented for determining moulded part mass from a combination of continuous process measurement and known polymer material pressure-specific volume-temperature (pvT) characteristics. The methodology determines the mass of melt that has been delivered to the mould cavity through the swept volume of the injection screw, but taking into account melt compressibility. The screw position is continually monitored by a computerized system along with the melt pressure and temperature. Results show a good correlation between the predicted and measured specimen mass over a range of processing conditions.
The plastics industry has been under heavy criticism from environmentalists for contributing to pollution and litter, exposing consumers to toxic matter, and using more than its fair share of energy resources. Are any of these accusations valid? If so, has our industry been responsive to these challenges in a meaningful way? Do the solutions offered by the environmentalists, to the problems they raise, have merit? This paper will attempt to address major environmental issues at they concern the plastics industry from an economic and scientific viewpoint and summarize what makes sense and what does not.
Titanate and zirconate coupling agents as invented by the author generate approximately six ACS CAS abstracted works (technical papers, articles and patents) per week. The author will review the literature and update ANTEC attendees on applications in thermoplastics and thermosets with an emphasis on the latest work in nano and green technologies such as biopolymers and landfill biodegradation. For example, investigators Lei, Yong; Wu, Qinglin; Yao, Fei; Xu, Yanjun from the School of Renewable Natural Resources, Louisiana State University Agricultural Center, Baton Rouge, LA, 70803, USA reported: Composites based on recycled high-polyethylene (RHDPE) and natural fibers i.e. pine wood flour and bagasse were made through melt blending and compression molding. The effects of the fibers and coupling agent type/concn. on the composite properties were studied. The use of maleated polyethylene (MAPE) carboxylated polyethylene (CAPE) and titanium-derived mixt. (TDM)-(20% pellet masterbatch of a neoalkoxy pyrophosphato titanate) improved the compatibility between the bagasse fiber and RHDPE and mech. properties of the resultant composites compared well with those of virgin HDPE composites. The modulus and impact strength of the composites had maxima with MAPE content increase. The composites had lower crystn. peak temps. and wider cryst. temp. range than neat RHDPE and their thermal stability was lower than RHDPE.""
Silica aerogels have attracted attention for many applications due to their unique properties such as low density (0.003g/cm), mesoporosity (pore size 2-50nm), high thermal insulation and high surface area (500-1200m2/g). However, their fragility and environmental sensitivity restricts the use of monolithic silica aerogel. In this paper, silica aerogel that is cross-linked with diisocyanate is introduced and the effects of polymer concentration on aerogel properties, especially mechanical strength are discussed. Fracture of silicaaerogel mainly occurs at the interface of secondary particles that are formed during aging. It is believed that if the surface of silica aerogel is covalently bonded to nanocast polymer coating, the interparticle necks become wider and can reinforce the structure of the aerogel.
Chi-Kai Shih, Mimi Y. Keating, M. Pottiger, M. Wetzel, May 2010
Explosive advances took place in all fronts of Polymer Analysis in the past 40 years. Selected breakthrough inventions in two of the most exciting areas, viz., thermal analysis and rheological analysis will be highlighted with emphasis on industrial applications. We'll discuss the evolutions, advancement, and impact to the industry and impact to science and technology as well as available stories behind these inventions. The selections were chosen from patent and journal articles on innovations such as DTA, DSC, TGA, thermal fractionations, TGA-GC, MASS, -IR etc., and MI, Mooney Viscosity tests as well as modern rheometers, polymer fingerprinting techniques.
David Grewell , Sean.T.Carolan , Gowrishankar Srinivasan, May 2010
Protein based plastics were processed using
anhydride chemistries in conjunction with glycerol to
obtain modified soy protein polymers that were water
stable. Formulations processed with chemistries such as
maleic anhydride (MA) and phthalic anhydride (PTA)
produced relatively water stable soy protein based
plastics. Various formulations were produced by varying
the anhydride content (3-10% w/w) in the final plastic
mass. The respective mixtures were extruded and
injection molded to form the samples for
characterization. Formulations with 10% PTA were
observed to have water absorption of only 19% after 24
hrs of water submersion as compared to 250% for the
control formulation.
Zhenwen Zhou , Haiying Zhang , Alexander Chudnovsky , W. Michie , M. Demirors, May 2010
Temperature strongly affects the mechanical
properties of pipe grade polyethylene (PGPE), such as
strength and toughness. It is observed in this study that
the temperature also affects the mechanisms of slow crack
growth (SCG). A change in the mechanism of SCG is
observed at certain temperature, named Crack Growth
Transition Temperature (CGTT). The CGTT of the cold
drawn (oriented) PGPE appears to be significantly higher
than room temperature. At the temperature above CGTT
the crack propagates discontinuously, stepwise, whereas
at the temperature below CGTT the crack grows
continuously. The slope of crack growth rate vs. stress
intensity factor (SIF) is also noticeably different for
temperatures above and below CGTT. The existence of
CGTT implies certain limitations for commonly used
extrapolation of SCG and lifetime data from the elevate
temperature of an accelerated testing to the room
temperature across CGTT.
Wei Yan, Shuhao Quo, Minmin Zhang, Jie Yu, May 2010
In this article, polyamide 6(PA6)/Organoclay masterbatch were prepared by melt mixing, and then acrylonitrile-butadiene-styrene(ABS)/polyamide 6(PA6)(70/30,w/w) nanocomposites were prepared by the melt mixing of PA6, ABS and organoclay. The effect of organoclay platelets on dispersion of ABS/PA6/organoclay ternary nanocomposites had been investigated by wide angle X-ray diffraction (WAXD) and transmission electron microscopy (TEM). Morphology analysis revealed that organoclay platelets were selectively dispersed and exfoliated in PA6 phase, but some were located in interface of PA6 and ABS phase.
Jason C. Baird, Ph.D. | John P. Christiano,, May 2010
A comprehensive study was conducted using three different types of extruder drive and motor configurations for a single screw extruder under identical conditions to compare the energy efficiency. Sound emission data was also measured and compared. Two systems of a conventional design used an AC or DC motor in combination with a mechanical gear reducer and were compared to a Direct Drive system using only a torque motor. The study showed that the Direct Drive system operated at higher energy efficiency and produced lower sound emissions compared to the AC & DC conventional systems. The results show that at the base speed of the drive train, the DC system consumed 10% more energy (kW) than the AC system, and the Direct Drive system consumed between 12 and 15% less energy than the AC system, depending upon the torque required.
Chan I. Chung, MoonKi Choi, Lee Gunning, Eberhard Gruenschloss,, May 2010
Plasma processes constantly gain importance in the field of plastics processing. They are influenced by production parameters on one hand and the substrate itself on the other hand. The properties of polymers vary substantially depending on their processing conditions or their history. This paper describes investigations on the plasma modification of polyamide (PA6) and polypropylene (PP). This includes the examination of the influence of absorbed water in the surface near regions of the bulk material as well as the interaction with the polymeric microstructure. The knowledge of this interaction between plasma and thermoplastic surface can be used for the process development or quality assurance in terms of plasma-assisted modification of polymers.
The incorporation of renewable resources in composite materials is a
viable means to reduce environmental impact and support sustainability
efforts in the composites industry. This paper will focus on unsaturatedpolyester
resins prepared from renewable resources and their use in
composite materials. Applications of these resins in the automotive
industry will be described including a comparison of properties and
performance vs. typical petroleum-based resins.
This paper presents an independent cost analysis for a novel slurrybased
preform technology in order to understand its potential benefits
across a range of component and reinforcement scenarios. Specifically
the economics for small medium and large automotive composites
reinforced with glass carbon and natural fibers through the use of
manual sprayup automated P-4 and slurry preforming are examined
and compared through technical cost analysis. The molding economics
of SMC RTM and SRIM are also addressed in detail.
The use of new aromatic thermosetting copolyester (ATSP) is described
and compared to the best available epoxies for high performance
composites. ATSP oligomers display liquid crystalline behavior which was
identified using optical microscopy with cross-polarizers.ATSP tailored to
have a liquid crystalline structure has reduced stresses at the fiber/matrix
interface and better thermal fatigue resistance compared to epoxy.
A new polyurethane adhesive has been developed that provides
excellent adhesion to SMC HSU and RTM without surface preparation
and requiring only a room-temperature cure or greatly reduced postbake
temperatures. This presentation will review where such an
adhesive will find application its general chemistry and supporting data.
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.
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