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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Various topics related to sustainability in plastics, including bio-related, environmental issues, green, recycling, renewal, re-use and sustainability.
Soy Protein Isolate Films with Improved Mechanical Properties via Bio-Based Dialdehydecarboxymethyl Cellulose Crosslinking
Glycerol-plasticized soy protein isolate (SPI) films with dialdehyde carboxymethyl cellulose (DCMC) as crosslinking agent were solvent casted and tested for their mechanical properties. Results indicate that the addition of DCMC increased tensile strength (TS) up to 218%, suggesting effective crosslinking between SPI and DCMC. The significant improvements in the TS compared to other dialdehyde polysaccharide crosslinking agents such as the dialdehyde starch is due to higher compatibility of DCMC with SPI, which was confirmed by SEM imaging. Furthermore, based on stress-strain features, a hypothetical mechanism was proposed to illustrate the effect of the polymeric cross-linking agent.
Stability of Poly (Etheretherketone) and Poly [2, 2’ (M-Phenylene- Bibenzimidazole] Blend under Harsh Environments
The objective of this work is to investigate the degradation mechanisms and property changes of a blend of poly (etheretherketone) (PEEK) with poly [2, 2’-(m-phenylene-5, 5’-bibenzimidazole] (PBI) upon exposure to water at temperatures up to 288 °C. The molecular scale damping behavior of PEEK/PBI blend was probed using dynamic mechanical analysis (DMA). Atomic Force Microscopy based nanomechanical mapping has been used to assess the moduli profile near the interface of PEEK and PBI with various environmental exposure histories. The results demonstrate that the incorporation of water influences the compatibility behavior of PEEK and PBI through enhanced interfacial adhesion. Fracture toughness of the PEEK/PBI blend is significantly reduced by hot water exposure at 288 ºC.
Tannic Acid: A Bio-based Intumescent Char-forming Additive for Nylon 6
Intumescent and char forming additives are typically blended into certain types of commercial plastics to impart resistance to fire propagation. Intumescent compounds such as ammonium polyphosphate/ melamine/ pentaerythritol, silica gel/potassium carbonate are already used as flame retardant (FR) additives. In this work, a naturally occurring polyphenol, namely tannic acid, is explored as an intumescent and char forming additive for polyamide - Nylon 6. The tannic acid was meltblended into Nylon 6 and the compounded plastic was evaluated for thermal stability, total heat release (THR) and heat release capacity (HRC). It was found that HRC and THR of nylon blended with tannic acid decreased by 50% and 20% respectively.
The Flameretardancy Study of PVA Using for Furniture Made from Corrugated Cardboard
Corrugated cardboards have truss structure, so these have advantageous in terms of specific strength, workability, price and recycling efficiency. Because of these properties, corrugated cardboards are used as not only packing materials but also furniture etc. When a disaster caused in Japan, refugees sleep directory on the floor with a blanket. It caused the second healthy damage like the economy class syndrome. For prevent refugees from its damage, beds made from corrugated cardboard has been used instead of cots in Japanese shelters. We need to give flameretardancy to the cardboard bed for enhancing safety. In this research, flameretardancy of corrugated cardboards is aimed to using Poly-vinyl alcohol (PVA). PVA is useful for the coat of the cardboard. The coating PVA on the cardboard is possible to be recyclable, because PVA has water solubility. We used 2 kinds of flameretardant in this time. In the result of combustion test, the Halogen, Phosphorous and Nitrogen based compound show great flameretardancy for PVA.
The Flameretardancy Study of The Cardboard Bed Made from Corrugated Cardboard
Recently corrugated cardboard is utilized for not only packing materials but also furniture and beds at shelters in Japan. The reason why the cardboard has the characteristics of lightness, high strength, cheapness and recycle ability. Therefore, there is the strong needs to add flameretardancy for cardboard beds in medical facilities for prevention of second disaster. The purpose on this study is to add flameretardancy to the cardboards with keeping the recycle ability. In this paper, the cardboard of combusting behavior was measured by using a calorimeter under the UL-94 standard. So far we have used 6 kinds of flameretardant include 3 kinds of commercial flameretardant. As a result ammonium sulfate has given superior flameretardancy to cardboards. However we considered that it has no practical use, because flameretardancy of cardboards must be safety from chemical toxicity. Therefore we selected 2 kinds of flameretardant. As a result a flameretardant which contain phosphorus and nitrogen gave great flameretardancy to cardboards with small quantity.
The Influence of Blend Composition and Additive Type on the Properties of LDPE-PA6-Blends
The aim of this work was to investigate the effects of the composition on the properties of LDPE-PA6 blends with an emphasis on the addition of EVA, because this material is often used as interlayer in packaging films. Furthermore, also the effects of additional compatibilization on the blend properties should be investigated.
We found, that the addition of EVA alone shows some compatibilizing effects in blend properties, like impact strength and viscosity. Further improvements can be gained by adding prefabricated additives, like maleic anhydride grafted polyethylene and ethylene vinyl acetate, while the in situ production of such additive shows some reduced effects, likely due to some reduced accessibility of the EVA component for the in-situ grafting. Nevertheless all the investigated approaches show some effectiveness in compatibilisation, which will help to reuse such materials in other applications.
Thermal and Mechanical Properties of Epoxidized Pine Oil and Acrylated Epoxidized Soybean Oil Blends
Synthetic polymers derived from crude oil are widely used across various industries. However, increased environmental regulations tackling climate change have spurred interest in development of bio-sourced polymers. While promoting the cause of sustainability, biopolymers also possess inferior mechanical properties, limiting their widespread use. A plausible and cost-effective way of enhancing the properties of pure biopolymers is to blend them with other polymers and/or reinforce them with stiff fibers. This study investigates the thermophysical properties of bio-based thermoset blends of epoxidized pine oil (EPO) and acrylated epoxidized soybean oil (AESO). The blends were prepared via casting in five different ratios by volume (EPO/AESO): 100/0, 90/10, 80/20, 70/30, and 0/100. Mechanical properties of blends were studied via tensile testing and scanning electron microscopy, while chemical properties were analyzed using thermo-gravimetric analysis.
Trouble Shooting Hot Tip Induced Polycarbonate Splay
Splay is a primary source of fallout when injection molding parts using polycarbonate. Elimination of splay is a difficult proposition, but maintaining acceptable baseline fallout across production is crucial to keeping waste under control and shipment of defects to customer to a minimum. Overall splay was reduced from 1.8 to 0.9 percent on parts running in excess of 1.4 million annually. The analysis provided in this paper shows how the extent of splay waste was identified, root cause analysis conducted, corrective action implemented, and results verified for one source of polycarbonate splay in a production environment.
Ultrasonic Extrusion Technology for Recycling of Crosslinked Polyolefins
Among the many environmental problems which mankind faces in the XXI century is the problem of environmental sustainability and management of the tremendous amount of generated polymer waste. Among various polymer wastes, management of crosslinked plastics is a major environmental problem requiring a solution. This study was specifically directed toward the creation of a new, environmentally friendly and science-based technology for the recycling of crosslinked plastics. Uncrosslinked thermoplastics can be easily reprocessed and reused. However, managing crosslinked plastics is a very challenging problem. This is due to the presence of a three-dimensional network, which prevents flow and shaping of crosslinked plastics upon heating and shearing. Our laboratory developed ultrasonic decrosslinking technology for recycling of the crosslinked high density polyethylene (XHDPE) of different levels of crosslink densities and crosslinked LDPE (XLDPE). This is done by using ultrasonically aided single-screw extruder (SSE) operating at a frequency of 20 kHz and twinscrew extruder (TSE) operating at a frequency of 40 kHz at different levels of ultrasonic energy . The experimental studies on the ultrasonic decrosslinking of XHDPE and XLDPE have shown that the ultrasonic extrusion was capable to preferentially break crosslinks rather than main chains in XHDPE. Significant reduction of the extruder torque, die and barrel pressures with the ultrasonic amplitude was observed during decrosslinking of XHDPE and XLDPE. The specific ultrasonic energy decreased with the flow rate and increased with the ultrasonic amplitude, while die pressure increased with the flow rate and decreased with the ultrasonic amplitude [2-5]. Accordingly, application of ultrasonic treatment during extrusion enabled an increase of productivity.
Ultrasonic Sealing Tool Design for Thin Film Plastics
Thin film packaging is used for a wide range of products including packaging of food, medical tools, electronics, and toys. Each of these applications requires a different type of film, from thin and brittle, to composite film including a foil layer, to biodegradable films. These films can be adhesively bonded, heat sealed, impulse welded, and increasingly, ultrasonically welded. Ultrasonic welding offers many benefits to thin film sealing such as faster cycle times, reduction in film usage due to narrower bond widths, elimination of adhesive layers, improved hermeticity for increased shelf life, and less sensitivity to contaminants in the seal area.
However, tool design can have a significant effect on weld strength. Optimum tool design depends not just on the thickness of the material to be welded, but also the type of polymer to be joined, and seal requirements (such as hermeticity and peel strength). In this study, we seek to provide starting guidelines with the goal of lowering the cost and duration of the tooling development process by investigating the achievable peel strength of a wide variety of film types with twenty-five horn and anvil design combinations.
De-inking paper sludge as a potential reinforcement for recycled plastics
The addition of de-inking paper sludge into recycled high-density polyethylene composites improves their tensile strength and stiffness, but is detrimental to their ductility and toughness.
Fabrication of self-reinforced cellulose composites
Cellulose fibers from agricultural waste are used to prepare composites with improved mechanical properties.
Biocompatible reinforcement of poly(lactic acid) with graphene nanoplatelets
Improved mechanical properties of composites produced by melt blending is achieved at low filler loadings.
Frictional heating of extruded polymer melts
Rheo-particle image velocimetry and thermal imaging results show that frictional and viscous heating act synergistically to produce significant temperature increases when a melt is extruded under slip conditions.
Biodegradable biocomposites with antimicrobial properties for food packaging
A novel ternary composite comprising a biopolymer, natural fibers, and an essential oil extract is a promising active material for extending the shelf-life of food products.
Polylactic acid biocomposite filaments with improved mechanical properties
Fully biodegradable polylactic acid/microcrystalline cellulose composites, with surface-modified reinforcing cellulose, are suitable for 3D printing applications.
High-performance polylactide biocomposites reinforced with cellulose nanofibers
Rheological, optical, mechanical, and thermomechanical investigation of the properties of cellulose-nanofiber-reinforced polylactide demonstrates the solution method for achieving good fiber dispersion.
Interfacial nanoreinforcement improves bamboo fiber/polymer composites
A fully biobased composite material, composed of bamboo fibers and a nanoparticle-reinforced bio-epoxy matrix, exhibits improved mechanical properties.
Reinforcing thermoplastic starch composites with cellulose nanofibers
Cellulose from sugarcane bagasse can be used to improve the mechanical and barrier properties of bionanocomposites.
Recycling paper waste sludge in water-blown rigid polyurethane foams
Thermal conductivity and mechanical strength measurements indicate that paper waste sludge particles can be used effectively as fillers in eco-polyol-based foams.
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