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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Recycling
Various topics related to sustainability in plastics, including bio-related, environmental issues, green, recycling, renewal, re-use and sustainability.
Autoclaved aerated concrete waste composites as a filler for natural rubber
Filling natural rubber with autoclaved aerated concrete waste enhances the processability and tensile and thermal properties of the composites.
Feather-inspired strong, light layered composites
Layered carbon-fiber-reinforced composites with a fractal-structured interlayer of carbon-nanotube-reinforced nanofibers show a high strength/weight ratio.
Electrically conductive nanocomposite
Adding graphene nanosheets to polymer blend polyamide 6/acrylonitrile butadiene styrene blends leads to electrically conductive nanocomposite materials at smaller threshold percolation.
Green composites based on poly(butylene) succinate
Reinforcing poly(butylene succinate) with hemp fibers and shives enhances the biodegradation rate.
Choice of extrusion screw for recycling glass-fiber-reinforced liquid crystal polymer
A smaller extrusion screw produces a recycled product with adequate mechanical and thermal properties for reuse in electronic and electrical applications.
Upcycling leather waste
Incorporating contaminated leather waste into natural rubber improves the rubber's mechanical properties and avoids improper disposal of toxins.
New biodegradable composites for food packaging
Beer spent grain fibers are a biodegradable waste resource that forms breathable thin films by conventional extrusion film blowing under processing conditions scalable to industrial production.
Green technology for modification of poly(vinyl chloride)
Biodegradable poly(hydroxybutyrate) copolymers plasticize, toughen, improve processing, and reduce UV discoloration.
Biopolyesters filled with date seed powder
Using date seed powder to reinforce the biodegradable polyesters poly-L-lactide and poly(butylene adipate-co-terephthalate) improves their properties.
Post-industrial waste nylon for automotive applications
Although slightly lower in tensile and fatigue strength, glass-fiber-reinforced waste nylon can be a viable substitute for reinforced prime nylon in cyclically loaded under-hood automotive applications.
Enhancing properties and value of recycled plastics
Adding graphene nanoflakes to recycled high-density polyethylene drastically improves its performance.
Bioplasticized poly(vinyl chloride)
Treatment with epoxidized soybean oil and bis(2-ethylhexyl) succinate for wire and cable applications softens the polymer but preserves tensile elongation properties after heat aging.
Enhanced cold crystallization of glassy poly(L-lactic acid)
Glassy PLA samples prepared by rapid compression possess lower onset crystallization temperature, higher crystallization rate, and larger final crystallinity than samples prepared by other methods.
Antibiotic wound dressings
Incorporating ampicillin into electrospun polyurethane makes bandages that control common infections.
SPE Bioplastic and Renewable Technologies Division Summer 2014 Newsletter
Read the latest issue of the SPE Bioplastic and Renewable Technologies Division newsletter.
High-performance compostable polymer biocomposites
Blending modified polylactic acid with hemp or jute fibers using hot melt extrusion improves its mechanical properties and compostability.
Acoustic Process Analysis of Rubber Compounding
Properties of rubber compounds differ batch-wise. This can lead to waste and, thus, it is desirable to reduce these variations. One reason for quality variations of rubber compounds is the discontinuous way of compounding in internal mixers. Mixing effects make it difficult to adjust the process parameters of internal mixers in order to guarantee constant qualities. Experienced operators of internal mixers observe that characteristic noises during the mixing process can be correlated with the state of mixing. Thus, a project has been started to use these mixing noises for the development of a control system for internal mixers, which is able to characterize the state of the rubber compound. First, a measurement system has been implemented which allows the online visualization and recording of the mixing noise. It is systematically analyzed how the mixing noise is related to the state of mixing and the resulting elastomeric properties. The results show a correlation between filler incorporation and the characteristic sounds.
Analysis of the Cure Compatibilization Efficiency of Peroxide/Sulphur System on Devulcanized EPDM and Polypropylene Blends with Reference to Devulcanized Tire Rubber and Polypropylene Blends
The usage of waste tire rubber crumb as a dispersed phase in a thermoplastic matrix has been a topic of study for a long time. Devulcanized rubber (DR) being relatively more similar to virgin rubber is expected to perform better than ground rubber tire crumb (GRT). There have not been many studies carried out on DR like in case of GRT. The present work is an extension of the previous work [1] which evaluated the efficiency of peroxide (PX)/sulphur (S) system to compatibilize devulcanized tire rubber (DRT) and PP. In this work, a similar study has been carried out on devulcanized EPDM (DRE)/PP blends and a comparison has been done with the earlier work. A statistical analysis has been carried out on the key mechanical properties namely tensile strength (TS) and elongation at break (EB). SEM pictures have been taken in an effort to understand the reasons for the mechanical properties obtained. The aim behind this work is to expand the commercial worth of DR in various applications.
Applications of Electrospinning to Develop New Biocomposites
Electrospinning has emerged as a versatile method to produce submicron fiber mats from natural or synthetic polymers. Electrospinning is a physical process used for the formation of ultrathin fibers by subjecting a polymer solution to high electric fields. At a critical high voltage (5-35 kV), the polymer solution droplets distort and forms the so-called cone of Taylor that erupts from the solution to form a charged polymer jet. This stretches and is accelerated by the electrical field towards a grounded and oppositely-charged collector. As the electrospun jet travels through the electrical field, the solvent completely evaporates while the entanglements of the polymer chains prevent it from breaking up. This results in the generation of highly functional and flexible ultrathin polymer fibers in the form of non-woven mats. Core-shell structures, produced by coaxial electrospinning, are of great interest for use in food packaging applications. In this area, our group has recently developed high throughput equipment based in a multinozzle coaxial technology that allows high productivity of fibers.
Aqueous Colloidal Suspensions of Polymers for Conformal Coatings
In this work, a mini-emulsion technique is used to prepare aqueous surfactant-stabilized suspensions of bio-based and optoelectronic polymers. Doctor blade coating is used to prepare films of controlled thickness. The relationship between colloidal suspension properties, processing parameters and film morphology is determined. This versatile wet coating process is appropriate for a large variety of applications, and the use of water instead of organic solvents improves the environmental profile of coating preparation. The required coating procedures and resulting properties are studied for two polymers: poly(3-hexylthiophene) and poly(butylene succinate), which find applications in polymer electronics and degradable packaging, respectively.
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