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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Dynamic Rheology of Amorphous Poly-Alpha-Olfeins (APAOs) as Hot Melt Adhesives
Amorphous poly-alpha-olefins based on propylene were characterized over a wide temperature range by dynamic rheology. The rheological characteristics were useful in correlating Brookfield viscosity, ring-and-ball softening point, needle penetration, and open time with molecular structure and comonomer content.
Using Diode Lasers For Welding Thin Polymer Films
Highly reliable high power diode lasers are now being increasingly employed in industry as alternatives to conventional techniques for welding of plastics. New laser sources that have been developed for other applications in completely different industries are becoming available to allow novel bonding techniques to be developed. This may include materials and material forms that are difficult to join using conventional techniques. Joining thin films and joining thin films to sheet materials is one new area application area that is covered here.
Effects of Friction Stir Welding on Polymer Microstructure
Friction Stir Welding (FSW) technology has shown great promise as a method of joining polymeric materials. Welds in several materials have achieved over 90% of base material tensile properties. Flexural strength has reached 90% of base material properties in PP. Research has shown a correlation between the process weld microstructure and mechanical properties. A study currently being performed establishes the relationships between the process parameters, material microstructure, and mechanical properties.
Diode Laser Welding of EPDM Based Elastomers
Contour transmission laser welding has been carried out on EPDM and on various grades of Santoprene welded to PP containing glass fiber filler. The effects of welding parameters on shear pull strength, and on the nature of failure has been examined, and analyzed with the help of finite element simulation.
Pyrometer Measurements during Laser Welding of Thermoplastic Elastomers to Polypropylene and of Nylon to Itself
Pyrometer measurements were collected during the contour through-transmission laser welding of thermoplastic elastomers to glass-filled polypropylene as well as of unfilled nylon to itself. The elastomer-to-polypropylene samples were in shear-lap configuration whereas the nylon welds were between a ribbed flange and a web, representing a modified T-weld. Trends observed in the pyrometer readings are reported for both of these cases.
Ultrasonic Twin Converter Technology For Welding Large Plastic Parts or Packages
Patented Ultrasonic Twin Converter technology as an alternative to other sealing methods for sealing larger injection molded parts, vacuum formed parts, blister packs or foils. Principle of Ultrasonic Twin Converter technology and the Weld Horn Array technology. Advantages, challenges, possibilities and limitations. Comparison to the generally used single horn technology. Typical applications with longer continuous joints or larger weld areas, circumferences.
Polymer Welding of Powder Injection Molded Ceramics and Metals
Ceramic or metal-filled plastics are increasingly being used for the production of sintered parts today, with the function of the plastic being to ensure that the compounds can be processed on the standard types of injection molding machines currently in use.In this way, it is also possible to use the plastic matrix to join individual components and produce material composites of mold steel/structural steel, for example, before sending the joined parts to be debound and sintered.
Novel Foam Composite Having Thick Skin and Core-Stiffening Dividers
Using a conventional RM process, we have developed various types of foam composites having a hard skin and a foamed core which is finely separated in divisions by solid walls. One type has characteristics of light weight and good mechanical properties, and another of excellent thermal insulation.This report describes the production method and some properties of novel foam composites.
Rotational Molding of Micropelletized Polypropylene-Based Copolymers
Deficiencies in grinding performance of polypropylene homo- and copolymers have restricted their use for rotationally molded articles. This paper will demonstrate that micropelletization overcomes these deficiencies, allowing these resins to be processed into rotationally molded articles. Four different propylene-based copolymers were molded under varying conditions. Low temperature impact strengths, tensile and flex properties and oxidative induction times were determined. Results will be compared to commercial LLDPE products.
Optimization of a Rotationally Molded Pressure Vessel
Optimization software is used to optimize the structure of a rotationally molded pressure vessel by suggesting a shape that maximizes strength and minimizes material investment while incorporating the manufacturing constraints. A previous design is utilized as a starting point that will be the basis for comparison of strength, material, and cost.
Rotomoldability of Cyclic Polybutyleneterephthalate
This study investigates the rotomoldability of a new and innovative plastics technology called Cyclics thermoplastics. It outlines the general guidelines for successful rotomolding of this material as well as, establish the (as rotomolded) Impact and tensile properties of cyclic Polybutyleneterephthalate (CPBT). This material has several features that make it attractive the rotomolding industry.
Particle Size Distributions in Rotomolded Parts
This study quantifies how different sized particles distribute themselves in bi-axially rotationally molded parts. The paper will demonstrate that within normal particle size distributions found in rotational molding, that it is difficult to obtain well-sorted layers in the final molded part. This paper compliments recent papers on powder characteristic in rotational molding.
Filling Pattern of Underfill and Particle Distribution
Underfills can improve flip chip reliability. However, the fillers used in some underfills to enhance coefficient of thermal expansion (CTE) properties can be dispersed unevenly, causing less than optimal reliability. In this study, underfill dispensing was conducted using various fill patterns. Experimental results show that particle migration is a secondary mechanism, which causes uneven filler distribution. Particle settling mainly occurred during the curing process, rather than during dispensing, and was affected by the surface tension.
Three-Dimensional Simulation of Wire Sweep during Semiconductor-Chip Encapsulation
In this paper, numerical methods to analyze the wire sweep during semiconductor-chip encapsulation are presented. The flow simulation necessary for wire-sweep analysis is based on a three-dimensional model. Different methods to calculate the force on the wire from the flow simulation results have been investigated. The calculation methods have been applied to typical semiconductor-chip encapsulation cases. The comparison between numerical and experimental results in terms of wire-sweep values shows reasonable agreement.
Interactions between Reactive Impact Modifiers and Carbon Black in Copolyesters
Conductive fillers are frequently added to thermoplastics such as polyesters to impart electrical conductivity; however, the addition of these fillers can be detrimental to the impact properties of the plastic. Reactive impact modifiers such as ethylene-methyl acrylate-glycidyl methacrylate copolymers (E/MA/GMA) are effective for toughening polyesters, but they can also interact with carbon black making it ineffective for imparting conductivity. Copolyester formulations exhibiting conductivity and good impact strength are realized by varying the GMA level.
Characterization of Structural Changes in Polypropylene Nanocomposites by Infrared Thermal Wave Imaging
Thermal wave imaging (TWI) technique using an infrared thermal camera has been used to follow the mechanical deformation of polypropylene nanocomposites. Images were acquired real-time during fracture toughness testing. TWI proved to be a useful tool to identify the differences in deformation mechanisms as well as to distinguish the plastic contribution in each of the specimens. Calculations of surface energy were done using data obtained from the thermal images.
The Effect of Nanoclay on the Deformation Behavior of Polypropylene and PPGMA Blends Using Online Birefringence Measurement System
The influence of organically modified montmorillonite (Mt) on the stress-strain behavior and structural development of polypropylene-grafted-maleic anhydride film was investigated. The presence of nanoparticles causes a decrease in overall birefringence when these films are stretched from partially molten state. On the other hand WAXS analysis indicate ,the orientation in the crystalline regions of PP was found to increase for films stretched to same true strain when nanoparticles are present.
Isothermal Crystallization Kinetics of Polyamide-6, Polyamide-66 and Their Nanocomposites
Isothermal crystallization kinetics of Polyamide-6, Polyamide-66 and their nanocomposites (NC) were studied using differential scanning calorimetry and high-pressure dilatometry. Calorimetry data for all samples follow Avrami’s equation. High pressure dilatometry yields two regions for PA-6 and PA-6NC crystallization: initially for the formation of ?- and ?-forms, and later for only the ?-form. Only one region was observed for PA-66 and PA-66NC under high pressure. Relevant kinetic parameters are discussed.
Mechanical Properties and Internal Structure of Injection Molded Glass Fiber Reinforced PC/ABS
In fiber reinforced thermoplastics, fiber breakage occurs during polymer processing. Also, surface treatment of fibers affects mechanical properties. By studying the effect of different surface treatments, compounding method and screw design on mechanical properties and fiber length distribution of injection molded products, it was found that these factors greatly affected the fiber length distribution and impact properties of glass-fiber reinforced PC/ABS (blend) composites.
Relationship between Mechanical Properties and Internal Structure of PC/ABS Blend Injection Moldings through Thickness Direction
In this study, the morphology through the thickness direction in PC/ABS injection moldings was investigated in more detail by slicing the specimen, the relationship between the structure and mechanical properties was investigated. It was found that the morphology drastically changed in terms of the position and the distance from the surface. ABS was most elongated in middle point. The deformation ratio along the thickness direction was also investigated.
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