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.
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Conference Proceedings
AN ENGINEERING APPROACH TO DESIGNING PLASTICATING SCREWS
FOR SINGLE-SCREW EXTRUDERS
An engineering approach for the design of
plasticating screws is presented with a case study. The
approach uses a combination of experimental data and
numerical simulations.
AN ENGINEERING APPROACH TO DESIGNING PLASTICATING SCREWS FOR SINGLE-SCREW EXTRUDERS
An engineering approach for the design of plasticating screws is presented with a case study. The approach uses a combination of experimental data and numerical simulations.
POLYCARBONATE HYDROLYSIS
The hydrolysis of polycarbonate (PC) is compared to
polybutylene terephthalate (PBT). Phosphorus additives
are shown to accelerate PC hydrolysis. Polycarbonate
polyester (PEC) copolymers hydrolyze faster than PC
however hydrolysis of the copolymer can be retarded by
addition of a hydro stabilizer. Color clarity and
mechanical properties are retained.
POLYCARBONATE HYDROLYSIS
The hydrolysis of polycarbonate (PC) is compared to polybutylene terephthalate (PBT). Phosphorus additives are shown to accelerate PC hydrolysis. Polycarbonate polyester (PEC) copolymers hydrolyze faster than PC, however hydrolysis of the copolymer can be retarded by addition of a hydro stabilizer. Color, clarity and mechanical properties are retained.
MORPHOLOGY STUDY FOR MICROCELLULAR INJECTION MOLDING
The morphology of microcellular injection molding is
investigated for different materials at different processing
conditions in current available equipments. Several
morphology models are proposed based on this study.
The conclusions provide the guidelines to select the best
processing parameters for different materials to make the
good morphology of microcellular foam by injection
molding with the minimum material property changes.
MORPHOLOGY STUDY FOR MICROCELLULAR INJECTION MOLDING
The morphology of microcellular injection molding is investigated for different materials at different processing conditions in current available equipments. Several morphology models are proposed based on this study.The conclusions provide the guidelines to select the best processing parameters for different materials to make the good morphology of microcellular foam by injection molding with the minimum material property changes.
CAE SIMULATION AND EXPERIMENTAL INVESTIGATION ON WARP OF AN
INJECTION MOLDED PART
The warpage of an injection molded part was
predicted by CAE injection molding simulation software
using mid-plane Fusion and true three-dimensional
analyses. An Arburg 320S Allrounder 55 ton injection
molding machine was used for producing parts. The part
deformation was then measured on a CMM. The
predicted part warpage among three mesh models was
compared to the measurement of part deformation. It was
found that the predicted part warp using the true threedimensional
model was in a good agreement with the
measurement of the part.
CAE SIMULATION AND EXPERIMENTAL INVESTIGATION ON WARP OF AN INJECTION MOLDED PART
The warpage of an injection molded part was predicted by CAE injection molding simulation software using mid-plane, Fusion and true three-dimensional analyses. An Arburg 320S Allrounder 55 ton injection molding machine was used for producing parts. The part deformation was then measured on a CMM. The predicted part warpage among three mesh models was compared to the measurement of part deformation. It was found that the predicted part warp using the true three-dimensional model was in a good agreement with the measurement of the part.
PROCESSING AND BLENDS OF BIOPLASTICS
Biopolymers are generally defined as polymers that are found in nature derived from nature or utilized as medical implants. Polymeric biomaterials which are utilized as medical implants are typically characterized for enduse performance as well as processability. While lactic acid is found in the human body polylactic acid is derived from natural resources and utilized as medical implants. This paper will utilize poly(lactic acid) as an example of a bioplastic where the morphological and isomeric structure has an influence on end-use properties such as mechanical properties biodegradability and biocompatibility.
SCREW DESIGN CONSIDERATIONS FOR BIOBASED POLYMERS
The family of biobased polymers is ever growing in
number and in popularity and the extruder/screw
manufacturing businesses need to keep abreast of the
machinery requirements of these polymers to insure that
efficient processing is understood. This paper will look at
the extrusion parameters and logic that are important to
determining the most efficient screw designs and
extrusion operating conditions for processing
biopolymers. Vented and non-vented operation will be
discussed. PLA data will be used as the basis for the
conclusions.
SCREW DESIGN CONSIDERATIONS FOR BIOBASED POLYMERS
The family of biobased polymers is ever growing in number and in popularity and the extruder/screw manufacturing businesses need to keep abreast of the machinery requirements of these polymers to insure that efficient processing is understood. This paper will look at the extrusion parameters and logic that are important to determining the most efficient screw designs and extrusion operating conditions for processing biopolymers. Vented and non-vented operation will be discussed. PLA data will be used as the basis for the conclusions.
HIGH PERFORMANCES POLYMER NANOCOMPOSITES BLENDS OF PEI AND PEEK
Multi wall carbon nanotubes (MWNT) range 1 3 & 5
wt% were used in the blend of poly (ether imide) and poly
(ether ether Ketone). Differential scanning calorimetry
(DSC) and dynamic mechanical thermal analysis (DMTA)
were used to investigate the changes in glass transition
temperature. The dynamic mechanical behavior of
polymer blends was found to be affected by the nanotubes
inclusion dispersion and interaction between the
compositions. At high filler inclusion nanotubes align
anisotropic during injection molding processing possibly
due to the high melt viscosity of the final composition.
HIGH PERFORMANCES POLYMER NANOCOMPOSITES BLENDS OF PEI AND PEEK
Multi wall carbon nanotubes (MWNT) range 1, 3 & 5 wt% were used in the blend of poly (ether imide) and poly (ether ether Ketone). Differential scanning calorimetry (DSC) and dynamic mechanical thermal analysis (DMTA) were used to investigate the changes in glass transition temperature. The dynamic mechanical behavior of polymer blends was found to be affected by the nanotubes inclusion, dispersion and interaction between the compositions. At high filler inclusion, nanotubes align anisotropic during injection molding processing possibly due to the high melt viscosity of the final composition.
THE USE OF ANTISTATIC AGENTS IN INTERNAL LAYERS OF MULTILAYER
FILM STRUCTURES
When Entira™ antistatic agents are used in the
internal layer of a multilayer film structure the measured
surface resistivity will be higher than when it is used in a
surface layer. However the static decay times of the film
are unchanged and the film retains its antistatic properties
as evidenced by for example its resistance to dust pick
up. This is an attractive solution in applications which are
hyper-sensitive to risk of contamination since the contact
layer can be a pure polyolefin.
THE USE OF ANTISTATIC AGENTS IN INTERNAL LAYERS OF MULTILAYER FILM STRUCTURES
When Entira antistatic agents are used in the internal layer of a multilayer film structure, the measured surface resistivity will be higher than when it is used in a surface layer. However the static decay times of the film are unchanged, and the film retains its antistatic properties as evidenced by, for example, its resistance to dust pick up. This is an attractive solution in applications which are hyper-sensitive to risk of contamination since the contact layer can be a pure polyolefin.
POLYOXYMETHYLENE (POM) FOR ROTATIONAL MOLDING APPLICATIONS
Polyoxymethylene (POM) commonlyreferred to as acetal or polyacetal wascommercially introduced to the rotationalmolding markets in 2006. This presentation willprovide an introduction to POM that includesfeatures and properties processing guidelines andmarket applications.
MICROFLUIDIC MIXER FOR POLYMER MELTS
We present a novel microfluidic mixer for high
temperature polymer melts based on the platform of the
Multi-sample Micro-slit Rheometer (MMR). The device
is essentially a static mixer with eight consecutive units of
splitting and recombination flow formed by stacking three
stainless steel shims (50 ?m thickness). The mixing
results show both multilayer and domain/matrix
morphologies depending on the channel configuration and
blend pair. This mixer will be particularly useful not only
as a polymer melt mixer but as a multilayer processor
when a limited material quantity (typical sample size ? 20
?L) is available.
MICROFLUIDIC MIXER FOR POLYMER MELTS
We present a novel microfluidic mixer for high temperature polymer melts based on the platform of the Multi-sample Micro-slit Rheometer (MMR). The device is essentially a static mixer with eight consecutive units of splitting and recombination flow formed by stacking three stainless steel shims (50 ?¬m thickness). The mixing results show both multilayer and domain/matrix morphologies depending on the channel configuration and blend pair. This mixer will be particularly useful not only as a polymer melt mixer but as a multilayer processor when a limited material quantity (typical sample size ƒ?? 20 ?¬L) is available.h
THE EFFECTS OF PLGA COMPOSITION ON MORPHOLOGY AND MECHANICAL PROPERTIES OF BIOSCAFFOLDS
In this study bioscaffolds using poly (DL-lactide-co-glycolide) acid (PLGA) were studied. The gas foaming/ salt leaching technique in a batch setup was employed. The effects of material composition on the morphology and mechanical properties using this process were investigated. Characterization of scaffolds fabricated with PLGA 85/15 and 50/50 showed that lower relative density was achieved with an increasing poly(DL-lactide) acid content. Furthermore the effect of PLGA composition on modulus of the scaffolds was minor.
A COMPARISON OF BLOWN AND CAST HDPE FILM USING EXPANDABLE
MICROSPHERE TECHNOLOGY
High-density polyethylene (HDPE) blown and
cast films were extruded with 0.5% 0.75% and
1.0% microspheres by weight comparing two
different grades of microspheres using two
different temperature profiles. All films were
analyzed for oxygen and water vapor barrier as
well as tensile properties. The blown film
samples demonstrated significantly lower
oxygen and water vapor permeation rates than
the cast films as well as a higher Young’s
modulus; however the cast films showed a
higher toughness.
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