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 Carbon Nanotube Alternative: Graphite Nanoplatelets as Reinforcements for Polymers
Intercalated natural crystalline graphite compounds [GICs] were formed followed by exfoliation and milling to produce sub-micron graphite flakes. SEM and TEM images showed that the average size of graphite became 0.86 um with a thickness of around 5 nm. The cost of this new nano-size graphite material was estimated to be around $5/lb or less. Since exfoliated graphite has superior mechanical, electrical, thermal properties and cost effectiveness, this material has been shown to be a superior potential reinforcement for polymer nanocomposites.
Polyol Modified Epoxy-Montmorillonite Nanocomposites
New nanocomposite materials were synthesized using DGEBA type of epoxy resin and triethylenetetramine curing agent as the matrix, alkyl ammonium modified montmorillonite as the reinforcing agent and polyether polyol as the impact modifier. X-ray Diffraction patterns showed that the interlayer spacing of the modified montmorillonite expanded from 1.83 nm to 3.82 nm. In samples without clay, the impact strength of the neat resin increased by 160 % at 7 weight % polyether polyol. Tensile modulus increased with increasing filler loading, but showed a maximum with respect to the polyether polyol content.
Synthesis and Characterization of High Density Polyethlene Clay Nanocomposites
High-density polyethylene/clay nanocomposites were prepared, using a twin-screw extruder. The nanocomposites were characterized with TEM, XRD, DSC, optical microscopy and tensile testing. The results show some exfoliation and indicate that the clay does not affect the melting temperature or crystallinity of the HDPE. However, the clay acts as nucleation agent and reduces the crystallite size. The clay improved the modulus, without causing large decrease in the elongation and impact strength.
LLDPE-g-GMA to Promote Adhesion of LLDPE with Polyesters
LLDPE-g-GMAs were synthesized in a twin-screw extruder by free radical grafting of GMA on LLDPE. The grafted GMA content was varied between 0 and 1.8wt% by changing the initial GMA and peroxide concentrations and the viscosity of the LLDPE. The double cantilever beam (DCB) test was then used to measure the adhesion of these materials with PETG. The effect of the grafting level, the presence of unbound GMA and the viscosity of the material was investigated. Good adhesive strength was developed, in particular when the material was purified to remove unbound GMA monomer and oligomers.
Oxidized Polypropylene and Ionomers Thereof as Compatibilizers for Polypropylene/Nylon-6 Blends
Oxidized polypropylene and ionomers thereof were evaluated as compatiblizers for polypropylene/ nylon-6 (PP/PA-6) blends. For these blends, the ionomer of oxidized PP provided better morphology and physical properties than the oxidized PP. The change in morphology was also reflected in the rheological behaviors that the compatibilized blends showed an increase in melt elasticity. With improvement in flowability and yellowing resistance, the ionomer of oxidized PP also, for the most part, yielded mechanical properties comparable to commercially available maleated PP.
Oxidized Polypropylene as Compatibilizer/Dispersion Agent for Flame Retardants
Oxidized polypropylene has been produced with a controlled level of functionality. Applications of this new polymer in both halogenated and non-halogenated flame retardant (FR) formulations were studied. Benefits include enhancement of flame retardance performance and improvement in mechanical properties, processability, and surface appearance. In the melt stage, rheological measurements of G’ indicate that relaxation time decreases significantly when adding oxidized PP, confirming the improvements in PP-FR interfacial interaction and FR dispersion in the PP matrix.
New Alloying Possibilities with SBM Block Copolymers
SBM is a new family of copolymers constituted of three blocks of linear chains covalently bonded to one another: polyStyrene, 1,4polyButadiene and syndiotactic polyMethylMethacrylate.The polar and apolar moieties on the same molecule render SBM ideal interfacial agents for many incompatible systems, offering innovative possibilities in the design of new high performance polymeric blends.This concept has already been successfully applied to several pairs of incompatible polymers. New achievements with PVDF / PPE are presented.
Stabilization of Dispersed Phase to Static Coarsening: Polymer Blend Compatibilization via Solid-State Shear Pulverization
Absolute compatibilization of immiscible polymer blends via a novel, continuous process, solid-state shear pulverization, and without addition of compatibilizing agents is quantitatively shown for the first time by stability of number-average dispersed-phase domain size to longterm annealing. Compatibilization via pulverization is due to in situ chain scission that is supported by molecular weight analysis of PS before and after pulverization, resulting in polymer radicals that can lead to in situ interfacial block copolymer formation.
Influence of Weight Fraction and Shear Rate on Particle Size in Polymer Blends
A relationship between particle size and volume fraction, viscosity ratio, interfacial tension, and shear stress was suggested, which can be used to estimate quantitatively experimental data of particle sizes in concentrated polymer blends, for simple shear flow. The relationship explains the observation that, for coalescence-suppressed polyethylene/polyamide-6 blends with high viscosity ratio (>>1), to which maleic anhydride grafted polyethylene was added as a compatibilizer, the particle sizes decreased with the increase of the dispersed phase weight fraction.
An In-Situ Process for the Production of Electrically Conductive Polyaniline Fibres from a Polymer Blend
The feasibility of using an in-situ deformation process for producing electro-conductive polyaniline (PANI) fibres embedded in the bulk of a filament-like composite and longitudinally oriented along its axial direction is evinced. Blends of a PANI complex and polystyrene-polybutadinepolystyrene (SBS) were capillary extruded into filaments. The extrudates’ microstructure consisted of elongated domains of the PANI complex embedded in the SBS, displaying a considerable degree of uniformity and continuity, and preferentially oriented in the extrusion direction.
Color and Appearance Measurement and Tolerancing Basics
Unlike properties such as impact or hardness that are directly measured in physical units, Color and Appearance are visual phenomenon that involves a physiological response by an observer. Color and Appearance are personal judgments that depend on how and under what conditions the observation is made. So how do we measure Color and Appearance and how can we set meaningful limits for those measurements?This paper reviews the basics of Color and Appearance measurement, Colorimetry, and addresses some of the important considerations in successful use of numerical tolerances.
Crystal Properties of Organic Pigments
Organic and inorganic pigments differ from dyes in that they remain particulate in application. Dyes are substances that are soluble or go into solution during the application process. Dyes’ coloristic properties are almost completely a function of their chemistry, but the properties of pigments greatly depend upon the physical characteristics of their particles. In the discussions below, the relationship of pigments' physical characteristics, especially organic pigments, to their application properties will be examined.
Verification of Color Difference Equations – Part II
It is the goal of instrumental color measurement to correlate with our visual assessment 100% of the time. Much work has been performed over the years evaluating how well various color difference equations meet this objective. In this new study, seventy-six colors were evaluated using CIELab, CMC, and the proposed CIE DE2000 equations as they compared to the visual assessment. No equation yielded the desired 100% correlation.
Qualitative Analysis of Optical Film Properties
Optical characterization of films presents several challenges to manufacturers and processors of polymers. Defects in polymer films create both mechanical and aesthetic problems in end-use situations. Grading of films has historically been subjective and time consuming when determining quantity and quality of flaws. This paper intends to discuss how newer transmitted-light technology can be applied to objectively grade and compare the film quality of polyolefin compounds.
Diffusion of Methanol, Ethanol and Toluene in Nylon 12 and Poly(Butyleneterephthalate)
This work investigates the diffusion of methanol, ethanol and toluene in Poly(butyleneterephthalate), (PBT) and Nylon 12 over a range of temperatures from 8°C to 60°C. The results show that substantial solvent uptake was noted for Nylon in methanol and ethanol. Solvent uptake in PBT occurred only at the higher temperatures in toluene. Dynamic Mechanical Thermal Analysis also showed progressive decrease in the glass transition temperature (Tg) and storage modulus (E’) with increase in solvent uptake.
Mechanical Behavior of TPV in Automotive Sealing Systems
TPV’s have become more commonly used in sealing systems as alternative for EPDM thermosetting elastomers. Most automotive seals experience low strain levels and a rather complex stress distribution. Consequently, translating the results of the classical mechanical tests, such as compression set and tensile tests, is not straightforward. In this study, a simplified lip-seal geometry of TPV is evaluated experimentally and numerically using FEA to identify the governing factors in the performance. The results give insight in optimizing the design and in aspects of material modeling.
Post-Mold Plastic Decorating
This paper will provide a look at various ways to post-mold decorate plastic parts including material selection, part design considerations, various manufacturing methods and the environment of the decorating process as well as the environment of the finished part.
Ultrasonic Welding of Copolyester Resins
Ultrasonic welding is routinely used to join thermoplastic parts used in medical devices. This paper examines the effects of physical aging, welding parameters, and joint design on weld strength using an amorphous copolyester. Recommendations for obtaining the optimal ultrasonic weld are presented.
The Effect of Blending Drop Temperature on Properties of Extruded PVC Tubing
The effect of blending drop temperature of a highly plasticized PVC resin was studied from compounding through extrusion and e-beam sterilization to produce medical grade tubing. Material characterization of the dry blend, pellets, and sterilized extruded tubing identified parameters in dry-blending and extrusion, which influenced the non-absorbed or free" plasticizer content and mechanical properties of the extruded tubing."
Nanomolding of Silicone Rubber Parts and Inserts in Thermoplastic
Molding of miniature parts (less than 10 cubic millimeters in volume) from liquid silicone rubber requires specialized molding machines and mold design to minimize flash and assure quality parts. Medical device part examples are used to illustrate sprue, runner, gate and part design concepts for these small parts. Techniques for insert molding LIM into thermoplastic parts to achieve bonding and minimum flash are reviewed.
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