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.
STRUCTURAL COMPOSITES FROM RECYCLED HDPE AND CALCIUM SULFITE CRYSTALLITES
Typically wood-plastic composites are manufactured from HDPE and wood byproducts. However to mitigate the concerns associated with the environment and costs attempts were made to develop structural composite materials from calcium sulfite hydrate (hannebachite) natural fibers and recycled HDPE. The hannebachite crystallites are produced during the scrubbing of coal combustion flue gases and have no commercial value. The structural thermal and mechanical behaviors of the composites as well as of raw materials were determined by SEM DSC DMA and flexural measurements. Our results suggest that it may be feasible to develop wood substitute composites without the use of wood or its byproducts. Flexural strength as high as 30 MPa was obtained.
STRUCTURAL COMPOSITES FROM RECYCLED HDPE AND CALCIUM SULFITE CRYSTALLITES
Typically wood-plastic composites are manufactured from HDPE and wood byproducts. However, to mitigate the concerns associated with the environment and costs, attempts were made to develop structural composite materials from calcium sulfite hydrate (hannebachite), natural fibers, and recycled HDPE. The hannebachite crystallites are produced during the scrubbing of coal combustion flue gases and have no commercial value. The structural, thermal, and mechanical behaviors of the composites, as well as of raw materials, were determined by SEM, DSC, DMA, and flexural measurements. Our results suggest that it may be feasible to develop wood substitute composites without the use of wood or its byproducts. Flexural strength as high as 30 MPa was obtained.
SUBSTITUTION OF POLYLACTICACID (PLA) IN PLACE OF POLYVINYLCHLORIDE (PVC) IN TRANSPARENT SIGNAGE FOR RETAIL USE
This project aims to investigate the material properties of Polylactic acid (PLA) and to compare them with Polyvinyl chloride (PVC) which is currently used in retail signage. There problems inherent in changing a process from an established material to a biodegradable polymer. The mechanical properties of PLA are under scrutiny to determine if it can be a reasonable substitute for PVC a non biodegradable plastic that must be land-filled or recycled at considerable cost after its post-consumer use. Many environmentalists suggest that biodegradable plastics can be substituted to fill the same roles as conventional polymers. PLA is a biodegradable polymer that is available in grades that are transparent and are manufacturable in most common thermoplastic processing methods including extrusion. PLAƒ??s substitution for PVC in this application can help to eliminate landfill and reduce overall pollution.
THERMAL AND RHEOLOGICAL PROPERTIES OF PHB SYNTHESIZED WITH VARIOUS HYDROXYVALERATE CONTENT FOR POTENTIAL USE IN FOOD PACKAGING
PHB (Poly (3-hydroxybutyrate) families of naturally occurring polymers are extracted from micro-organisms.PHB behaves similarly to conventional thermoplastics, yet are fully biodegradable in common composting conditions.To improve flexibility for potential food packaging applications, PHB can be synthesized with various copolymers such as 3-hydroxyvalerate (HV). The objective of this study was to characterize the thermal and rheological properties of PHB synthesized with various valerate contents and relate these findings to potential food packaging applications.
THERMAL STABILIZATION OF BIODEGRADABLE POLY-HYDROXYBUTYRATE (PHB) IN MELT EXTRUSION PART 1: POLY-OLIGOMERIC-SILSESQUIOXANE
Poly-Oligomeric-Silsesquioxane POSS nano modifier was examined as a thermal stabilizer for PHB.Melt compounding of Poly-Hydroxy-Butyrate PHB copolymers with different POSS moieties was performed.Reactive and non-reactive POSS nano modifiers were used. The effect of modification on PHB thermal stability was evaluated by changes in rheology and molecular weight. POSS modifiers with unique core-shell structures were found to significantly reduce the loss in molecular weight during melt mixing possibly by decreasing viscous-heating effects.
UNSATURATED POLYESTER RESIN FROM CHEMICAL RECYCLING OF OFF-GRADE POLYETYHYLENE TEREPHTHALATE
Poly(ethylene terephthalate) [PET] from off-gradesof industrial manufacturer was depolymerised usingexcess ethylene glycol [EG] in the presence of metalacetate. Influences of the reaction time volume of EG and catalysts concentrations on the yield of theglycolysis products were investigated. In this study wehad three 3-level factors for reaction time volume ofEG and catalysts concentrations on the basis ofTaguchi's statistical method. The optimal conditionsare reaction time of 3 h molar ratio (EG to PET) of 5 weight ratio (catalyst to PET) of 0.25 wt%. Theglycolysis products were analysed for hydroxyl valueand identified by DSC and VPO. The optimum samplewas used to produce unsaturated polyester resin [UPR]by maleic anhydride [MA]. The samples alsocharacterized well by FT-IR 1HNMR and 13CNMR.
WEATHERING PERFORMANCE OF A SCRATCH RESISTANT WEATHERING PERFORMANCE OF A SCRATCH RESISTANT
The weathering performance of a Lexan* copolycarbonate resin was studied against a benchmark PC resin. Known ISO, ASTM and SAE weathering protocols were used and observed differences explained. Lexan* copolycarbonate resin offers a scratch resistant polycarbonate solution that opens up new possibilities in terms of part performance. Key applications range from mobile phones to interior automotive trims and benefit from the elimination of secondary operations due to the increased hardness of the material. This can lead to costout opportunities and environmentally friendlier solutions where conventional protective hard coatings or painted surfaces are considered.
WELDABILITY OF BIOPLASTICS
The cooling process in conventional rotational moulding has a relatively long cycle time. It is normally accomplished by external forced air convection and external water spray cooling. In some instances, an evaporative cooler is employed to create atomised fog external to the mould during the cooling cycle. Internal water spray cooling is an attractive approach to reduce the cycle time and enhance the product properties in rotational moulding. It is shown that water spray cooling of polymers is affected by water droplet size and water droplet velocity. This paper outlines an introduction to the characterisation of water droplets. The effects of these parameters on water spray cooling of polymers are also presented, using a purpose built experimental test rig. With the growing demand for environmentally friendly biorenewable resources, there has been a parallel growth in the development of bioplastics. These include commercially available starch-derived plastics and plastics derived from renewable oil and proteins. As with any plastic, these new materials must often be joined to produce final products. This paper reviews impulse and ultrasonic welding of PLA as well as friction welding of plant protein-based plastics. It was found that each of these plastics can be welded with weld strengths matching the parent material strengths.
New leather- and rubber-waste composites for use in footwear
A sustainable solution for hazardous waste from roughing and carding processes generates nontoxic rubber composites for use in shoe soles.
Chemical modification of flexible poly(vinyl chloride) by nucleophilic substitution
A new method of removing chlorine from an everyday waste plastic promises to increase the amount of recyclable material.
Accelerating the crystallization of poly(lactic acid)
Combining nucleation agents and plasticizers enhances the material's crystallization rate and could extend its range of applications.
Nanofillers improve the mechanical properties of recycled polypropylene
The impact and modulus of polypropylene reinforced with nanocalcium carbonate correlate with morphology, filler level, and the effect of recycling on the resin matrix.
Predicting starch transformation in twin screw extrusion
Dedicated software makes it possible to predict the change in the intrinsic viscosity of starch.
Degradation behavior of aliphatic biodegradable polyesters
Structural changes of polyesters during in vitro incubation provide insights into their degradation that could be important for development of biomedical applications.
Reinforced biocomposites with guaranteed degradability in soil
The addition of cotton fibers to a starch-based commercial material maintains its thermal stability and assures its biodegradation.
Synergistic effects on nonisothermal poly(lactic acid) crystallization
The combination of plasticizers and nucleating agents accelerates the crystallization rate of poly(lactic acid).
Bioplastics and global sustainability
Application of bioplastics is in its infancy stage but holds significant promise in developing sustainable plastics for the future.
Oil-palm fiber as natural reinforcement for polymer composites
The importance of natural fibers as reinforcement or fillers in polymers is increasing, but limitations have prevented them from totally replacing synthetic fibers.
Freeze-thawed hydrogels for modeling blood vessels
Artificial materials that match both the physical dimensions and mechanical properties of biological blood vessels could be useful in biomedical simulation experiments.
A unique, high-flow, drapable, soft reprocessable material
A new pelletizable, reprocessable composition can be converted into a nonwoven material or a fabric suitable for spin bonding.
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