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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A new range of polycarbonate copolymers derived from bisphenol-A (BPA) and specific bio-sourced monomer derived from castor bean oil is presented. These copolymers, designated LEXAN* HFD resins, offer an improved melt flow and ductility balance compared to standard polycarbonate yet offer similar high optical clarity and light transmission properties. Lower temperature processing capability, longer injection molding flow lengths, improved low temperature ductility, and superior mold release performance are all advantages for these new copolymers versus a standard polycarbonate material. Glass fiber-filled formulations of the HFD copolymer show comparable mechanical and impact properties compared to glass-filled polycarbonate materials but show nearly 50% higher surface gloss in injection molded plaques.
A. R. Kamdar , P.S. Dias , Y.J. Lin , B.C. Poon , P. Ansems , A. Hiltner , E. Baer1, May 2010
The effectiveness of elastomeric copolymers as adhesives for polypropylene and polyethylene was studied using coextruded microlayered tapes. The olefinic and styrenic block copolymers were the most effective adhesives of all the elastomeric copolymers used in this study and they delaminated adhesively from the polypropylene-tie-layer interface during T-peel experiments. The effect of tie-layer thickness peel temperature and peel rate on the adhesive properties were probed. Relationships between tie-layer deformation damage zone structure interfacial morphology and delamination toughness were established and a structural mechanism is provided.
Kevin P Menard , Andrew Salamon , Enrique Lazano Diz , Richard Spragg, May 2010
DSC is widely used to investigate phase changes of materials as their temperature is changed, or isothermally.However the information obtained is essentially quantitative as this is a univariate technique that simply measures heat flows. Vibrational spectroscopy can provide complementary information, giving insight at molecular level.into the changes accompanying thermal events or reactions. In addition the multivariate nature of Raman spectra means that it is possible to monitor simultaneous events with different spectral signatures that cannot be distinguished by DSC. A hyphenated system is described, evaluated and applied to some polymer systems
Liang Fang , Ming Wei , Yingrui Shang , Jun S.Lee , Carol Barry , David Kazmer , Joey Mead, May 2010
The surface phase morphology of thermoplastic elastomers can be affected by injection molding parameters. In this paper the influence of mold temperature on the phase morphology of SEBS triblock copolymer was studied through tapping mode atomic force microscope (AFM) and 2D-Fast Fourier Transformation (2D-FFT) analysis. It was found that more orientation was present in the materials prepared using high mold temperatures.The orientation direction of the morphologies could be predicted by computer simulation.2D-FFT analysis can be used to study the domain orientation and structure.
This study presents a new approach which involves
melt-blending a low molecular weight additive and a
polymer at a process temperature where the additive
reduces the process viscosity. Upon cooling, the additive
forms crystalline reinforcing domains. Emphasis is given
to reinforce isotactic-polypropylene (iPP) with calcium
stearate (CaSt). The changes in yield strength and
modulus suggest a synergy between the CaSt and iPP.
Addition of 10% CaSt increases the fracture energy by 5
fold without a loss in modulus and with an apparent
reduction in shear viscosity. CaSt is the only additive
commencing simultaneous improvements.
Ken Miyata , Taku Ozama , Keiji Katsuno , Akihiro Nishioka , Tomonori Koda , Go Murasawa, May 2010
Effect of molecular structure on heat seal properties
for high density polyethylene (HDPE) film was
investigated in this study. Polyolefin is usually adopted as
a sealant material for general packaging system. Melting
temperature of the HDPE film used in this study was 126
oC. The heat seal temperature was controlled and varied at
around melting temperature of HDPE precisely. The
mechanical property of the sealed films was measured by
a T-shape peeling test. Development molecular structure
at film interface for sealing was evaluated in a wide angle
x-ray diffraction pattern and changing of molecular
orientation relaxation corresponding with the mechanical
peeling property. Thermal property was also analyzed by
a differential scanning calorimetry (DSC). The weight
fraction of melting region in heat seal process was
estimated from the DSC thermograms. We discussed that
the amount of melting region is related to the major factor
to decide peeling properties of heat sealed HDPE film.
Ken Miyata , Taku Ozama , Keiji Katsuno , Akihiro Nishioka , Tomonori Koda , Go Murasawa, May 2010
Effect of molecular structure on heat seal properties for high density polyethylene (HDPE) film was investigated in this study. Polyolefin is usually adopted as a sealant material for general packaging system. Melting temperature of the HDPE film used in this study was 126oC. The heat seal temperature was controlled and varied at around melting temperature of HDPE precisely. The mechanical property of the sealed films was measured by a T-shape peeling test. Development molecular structure at film interface for sealing was evaluated in a wide angle x-ray diffraction pattern and changing of molecular orientation relaxation corresponding with the mechanical peeling property. Thermal property was also analyzed by a differential scanning calorimetry (DSC). The weight fraction of melting region in heat seal process was estimated from the DSC thermograms. We discussed that the amount of melting region is related to the major factor to decide peeling properties of heat sealed HDPE film.
Charles J. O’Neil , Tony Listro , Amar S Nilajkar , Lawrence A. Acquarulo Jr., May 2010
An attempt was made to combine two existing technologies ƒ??nanocompositesƒ? and ƒ??crosslinkingƒ?. The goal of this work was to study the combined effects of nanoclay and crosslinking on the physical properties of polyamides. Tensile and flexural properties have been studied and reported. The effect of radiation dosage level on these properties has been looked at as well.The approach was to melt blend polyamide based polymers used in the medical industry with nanoclay and a crosslinking agent. The different polyamide based polymers used were nylon 12 and a polyether-block amide copolymer. The nanoclay used was Closite from Southern clay.
Polyphenylene ether is an engineering thermoplastic known for its excellent water resistance, dimensional stability and inherent flame retardancy. A triblock copolymer of polyphenylene ether-polysiloxane is produced by the oxidative coupling polymerization of 2,6-xylenol and eugenol-capped polysiloxane. This method of producing the copolymer is simpler than prior methods of preparing related copolymers by linking preformed polyphenylene ether and polysiloxane blocks. This paper describes the copolymer structure and the significant improvements in key properties such as impact resistance, flame retardancy and smoke generation obtained with the copolymer as compared to the polyphenylene ether homopolymer.
Ken Miyata , Yuuki Ichikawa , Keiji Katsuno , Akihiro Nishioka , Tomonori Koda , Go Murasawa, May 2010
Molecular structure development and the deformation
width and thickness behavior in T-die extruding of high
density polyethylene (HDPE) was studied. The extruding
through-put rate polymer material feeding rate and
winding roll temperature were fixed. The velocity of
winding roll was controlled and varied independently. The
effect of processing condition was analyzed from
molecular orientation distribution in machine direction
(MD) to transverse direction (TD) by measuring optical
retardation. To analyze crystalline structure development
behavior of HDPE film wide angle x-ray diffraction
(WAXD) pattern was also measured in TD of extruded
film. The diffraction intensity distribution on the equator
the meridian and azimuthal direction for (110) and (200)
were evaluated. We discussed major factor to control film
width and thickness. Relationship between molecular
structure development and the external form of extruded
film was studied.
Ken Miyata , Yuuki Ichikawa , Keiji Katsuno , Akihiro Nishioka , Tomonori Koda , Go Murasawa, May 2010
Molecular structure development and the deformation, width and thickness behavior in T-die extruding of high density polyethylene (HDPE) was studied. The extruding through-put rate, polymer material feeding rate and winding roll temperature were fixed. The velocity of winding roll was controlled and varied independently. The effect of processing condition was analyzed from molecular orientation distribution in machine direction (MD) to transverse direction (TD) by measuring optical retardation. To analyze crystalline structure development behavior of HDPE film, wide angle x-ray diffraction (WAXD) pattern was also measured in TD of extruded film. The diffraction intensity distribution on the equator, the meridian and azimuthal direction for (110) and (200) were evaluated. We discussed major factor to control film width and thickness. Relationship between molecular structure development and the external form of extruded film was studied
Yunior Hioe, Jesse Guerra, Siva Movva, Dante Guerra, L. James. Lee, Jose M. Castro, May 2010
Nanoparticles have shown the potential to improve the mechanical properties of fiber reinforced polymeric composites (FRPC). Premixing nano particulate into the resin is a common approach to add nanoparticles into FRPC. However, well dispersed nanoparticles will greatly increase the resin viscosity and filtering of the nanoparticles is difficult to avoid. To solve these problems, a new method to pre-bind the nanoparticles onto the long fibers has been developed by our group. We have previously presented results on the effect of nano particles on the preform permeability, in this paper we develop an approach to relate the overall preform permeability to the amount of nano fibers prebinded.
Naoya Mieda , Kenzo Okamoto , Masayuki Yamaguchi, May 2010
The rheological properties for the binary blends composed of a linear polyethylene and a branched polyethylene (LDPE) are studied. It is found that some blends show enhanced oscillatory shear moduli than the individual pure components, suggesting that the relaxation mechanism with long characteristic time is generated in a molten state. Further, they show higher zero-shear viscosities. The drawdown force, defined as the force needed for the extension of a polymer melt from a capillary rheometer, is also evaluated to comprehend the rheological information under the elongational flows and found to be quite sensitive to the anomalous behavior. Furthermore, it is found that the blends show marked flow instability, because they have longer relaxation time than the pure components.
Rachmat Mulyana, Thomas Daniel, Yong Min, Jose M. Castro, L. James Lee, May 2010
In injection molding, cycle time and sink mark are critical factors for process economics and product quality. This work focuses on reducing cycle time and sink part by utilizing water containing polymer/activated carbon pellets. Pellets were prepared by compounding a microparticle, activated carbon (AC) via extrusion, followed by a batch process of pressurizing a small amount of water into the pellets under controlled pressure and temperature. The amount of water, packing pressure and packing time were varied in the injection molding experiment. Preliminary results showed that the cycle time could be reduced to half and part shrinkage substantially decreased at a lower packing pressure without losing mechanical properties when the water content was low (e.g. 0.3 wt %). However, too much water (e.g. 2 wt %) tended to reduce mechanical properties even though the cycle time could be further reduced. We are in the process of tailoring the process conditions for optimized results, as well as evaluating the effect of residual water on the long-term properties of molded parts.
Sarah Chung, Tieqi Li, Ken Oliphant, Patrick Vibien, May 2010
Ticona has developed a new family of impact modified polyoxymethylene (POM) co-polymers that demonstrate a combination of improved stiffness, impact strength, and up to a 290% increase in weld line performance compared to similar commercially available impact modified POM co-polymers. The unique properties of the new products have been achieved through the modification of the polymer backbone. The new grades provide enhanced product performance, up to 30% faster cooling time, and less mold deposit for a variety of injection molding and extrusion applications.
Sarah Chung , Tieqi Li , Ken Oliphant , Patrick Vibien, May 2010
Plastic piping materials confer many advantages in Potable Water applications and have enjoyed a long and successful application history. Part of that success has been the considerable research that has been conducted to develop methodologies for characterizing and ensuring service performance. A key component of accelerated methodologies is ensuring that the observed mechanisms are the same as those potentially occurring in the field. In this paper field exposed plastic piping materials from aggressive applications are examined to determine the aging mechanisms observed in end-use environments.These mechanisms are compared with those observed in accelerated testing.
Kenji Okubo , Shigeo Tanaka , Hiroshi Ito, May 2010
This study aims to develop processing techniques to improve dimensional accuracy of micro-size parts produced by micro metal injection molding (?¬-MIM).Micro dumbbell specimens were molded by a micro injection molding machine, which can monitor the cavity pressure in injection molding process. The effects of particle size and distribution of metal powder on dimensional accuracy of micro dumbbell specimens at both grip parts were investigated. As the results, it is confirmed that the powder properties and sintering conditions to improve the dimensional accuracy of micro- MIM parts.
Nan Chen , Mohammad Monirul Hasan , Takashi Kuboki , Chul B. Park, May 2010
In this paper, the effect of the crosslinking degree on the solubility of N2 in Ethylene-Vinyl Acetate (EVA) was investigated. Determining the solubility of the blowing agent is crucial for achieving fine-cell products in both the continuous and batch foaming processes with crosslinking. The variation of the crosslinking degree was controlled for the EVA samples, and a magnetic suspension balance (MSB) was employed to run the sorption tests. The solubility results were analyzed and discussed based on the experimental data.
Howon Yoon , Kenzo Okamoto , Masayuki Yamaguchi, May 2010
Carbon nanotubes (CNT) are a great candidate to obtain a conductive path in a polymer matrix with a small amount, because it has large aspect ratio. The purpose of this study is to localize CNT at polymer surface by annealing procedure employing laminated sheets composed of an immiscible polymer pair, in which one component contains CNT and the other does not. It was found that CNT transfer occurs by Brownian motion from the composite with CNT to the surface of the pure polymer. As a result, the pure polymer obtained after the separation from the laminated sheets exhibits electrical conductivity owing to the conductive path of the CNT localized at the surface.
The high growth in the medical market along with the increased demand for high standards in injection molding in the last five years have lead to the emergence of a new class of valve gate hot runner that provides better molding process consistency along with unmatched part quality. This new valve gate hot runner uses a plate to couple valve stems to allow them to be driven by a hydraulic or electrical actuator. The coupling enables synchronicity of stem movement and the drive provides consistent high force. This paper presents this new hot runner technology that found a niche in stringent applications such as small part molding and the medical market.
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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
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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