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.
EFFECT OF THE DEGREE OF SUBSTITUTION OF CARBOXYMETHYLATED CASSAVA STARCH TESTED AS GREEN CORROSION INHIBITOR OF CARBON STEEL
The effect of the degree of substitution (DS) of carboxymethylated starch (CMS) as green corrosion inhibitor of carbon steel on 200 mgL-1 NaCl solution was investigated. Physical/chemical structure of CMS was studied by Fourier Transform Infrared Spectroscopy (FTIR) and Nuclear Magnetic Resonance (13C-NMR). DS of this bio-polymer was determined by back-titration. Its inhibitive properties were evaluated using polarization curves and electrochemical impedance spectroscopy. CMS acts as corrosion inhibitor and the protection level is highly dependent on the degree of substitution. The formation of a chelate between carboxylate groups and ferrous cations allows the inhibition mechanism of CMS to be explained.
EFFECT OF TRIACETYL CELLULOSE FILM SURFACE HYDRATION ON THE ADHESION STRENGTH TO POLYVINYL ALCOHOL (PVA) FILM
Triacetyl cellulose (TAC) film has been used as a protective film for the polyvinyl alcohol (PVA) based polarization film in liquid crystal display (LCD). Adhesion strength between TAC and PVA films by PVA type adhesive must be maintained sufficiently to keep the dimensional stability of polarized PVA film under severe environmental conditions, such as high temperatures and high humidity. In this study, the surface hydration of TAC film and adhesion process between TAC and PVA films were investigated. The surface hydration of TAC enhanced the adhesion strength between TAC and PVA films. Consequently, this provides better dimensional stability of polarized PVA film protected by TAC film. In addition to adhesion strength, appropriate draw ratio and the crosslinking in PVA film were also required for better dimensional stability in polarized PVA film.
EFFECTIVENESS OF SUPERCRITICAL FLUID FOR FOAMING OF POLY(LACTIC ACID) DURING INJECTION MOLDING
Poly(lactic acid) (PLA) is one of the most favorable candidates to replace conventional packaging materials due to its biodegradability and sustainability. However, its high viscosity and density often poses a challenge to melt processing especially injection molding. In this study, PLA was injection molded and foamed by using supercritical N2. Injection molding parameters such as mold temperature and SCF content were varied in order to investigate their effects on foam cell size. The effects of nucleating agent on the foam structure and cell size distribution were also elucidated by image analysis. Impact and dynamic mechanical performance of the foams were also evaluated.
EFFECTIVENESS OF TALC AS REINFORCEMENT FOR RECYCLED-PET/PE-G-MA BLENDS
Recycling post-consumer PET bottles is an essential and practical solution to reduce the amount of waste discarded at the landfills. Several methods are commonly used to recycle PET such as fiber making, sheet extrusion and injection molding. However, PET is known to exhibit low notched impact strength and low heat distortion temperature. In this study, an impact modifier was successfully used to enhance the toughness of recycled RPET (RPET). Subsequently, talc, which is typically used in polypropylene, was introduced into RPET and its effectiveness as a reinforcement was evaluated. It was noted that the heat distortion temperature (HDT) of the composites increased significantly with increasing talc content.
SINGLE SCREW EXTRUSION OF BIOBASED AND BIODEGRADABLE POLY (HYDROXY BUTANOIC ACID) COPOLYMERS
The complex time and temperature dependent melt rheology of Poly (Hydroxy Butanoic Acid) or PHB copolymers is an important consideration for their extrusion. In this effort, we report the influence of temperature profile and screw design on the process stability, melt temperature, melt pressure, output rate and molecular weight retention using highly-instrumented commercial-scale extruders with smooth-bore feed sections. One important outcome of this investigation is screw design guidelines for the extrusion of PHB copolymers.
ENVIRONMENTAL HEALTH AND SAFETY ISSUES AND APPROACHES FOR THE PROCESSING OF POLYMER NANOCOMPOSITES
In 2005 Environmental Defense and DuPont entered into a partnership to develop a framework that seeks to identify and address potential environmental health and safety (EH&S) risks of nano-scale materials. The Nano Risk Framework was published to establish a systematic and disciplined process to identify and reduce potential risks during nanomaterial development and meet continued product stewardship commitments . This paper describes an approach developed for and the application of the Framework to the processing of polymer nanocomposites at laboratory and semi-works scales. Carbon nanotubes were melt-blended into a polymer matrix with a batch mixer to improve mechanical and electrical properties.Nano-TiO2 nanocomposites were made on laboratoryand semi-works extruders. These case studies exemplify DuPontƒ??s approach to handling nanomaterials in the product research and evaluation phase of development.Utilization of the Framework enabled further refinement of internal EH&S management procedures and to identify questions to be answered for such applications before they move to commercialization.
ENVIRONMENTAL AGEING OF MATERIALS USED FOR COLLAPSIBLE FUEL STORAGE TANKS
The purpose of this work was to perform a comparative analysis of various candidate nitrile coated fabric materials supplied by potential vendors to be used as fuel storage tanks and compare the results to the currently fielded polyurethane storage tanks. Our strategy is to utilize advanced environmental ageing methods to simulate extended weathering conditions. Our results demonstrate that the nitrile coated fabrics performed well in our evaluation. Their breaking strengths are about equal to the currently fielded urethanes and they performed comparably when subjected to environmental ageing conditions.
SYNTHESIS AND PHYSICAL CHARACTERIZATION OF BIODEGRADABLE PLA/PHBV FOAMS
This paper examines the effect that blending two biodegradable polymers has on the thermal properties and morphology of the resultant foams blown with carbon dioxide (CO2). Polylactic acid (PLA) Polyhydroxybutyrate-co-valerate (PHBV) and blends of both were foamed and characterized in terms of thermal characteristics relative density cell size and foam morphology. The results indicate that although PLA and PHBV are immiscible the presence of small quantities of PHBV could lead to low density foams with finer more uniform cells.
SYNTHESIS, CHARACTERIZATION, AND DEGRADATION OF BIOPLASTICS FROM RENEWABLE POLYFUNCTIONAL MONOMERS
Bioplastics were produced by the copolymerization of 1,3-propanediol (PDO) with malonic acid (MA) and with itaconic acid (IA). Effects of reaction temperature and time were examined on the yields and molecular weight (MW) distributions. The resultant bioplastics were characterized using FTIR and 1H NMR and were found to contain anhydride, ester, and ether backbone functional groups. Hydrolytic degradation of the PDO-MA copolymer was also studied as a function of time, temperature, and pH.
THE BUILDING BLOCKS OF INNOVATION: DELIVERING COMPETITIVE ADVANTAGE THROUGH CREATIVE PEOPLE
The goal of innovation should be to create sustainablecompetitive advantage'not just create inventions withlittle or no market value. In order to compete, the productof service being offered must provide value to theconsumer, be differentiated from competitors' offerings,and be protected from imitation. Frequently employeesand managers involved with product development are notaware of the broader picture and the essential elementsnecessary to create innovative products.
EVA CURING STUDY BY DSC FOR SOLAR APPLICATION
Ethylene vinyl acetate (EVA) has been used as encapsulant for solar cell application. the curing degree needs to be controlled to optimize the property. The traditional way to characterize the gel content (crosslinking degree) is by extraction using organic solvent. This method is time consuming and environmental unfriendly due to the toxic solvent. One new way to characterize gel content is by DSC. From the exothermic residue crosslink peak the gel content can be determined. The study indicates excellent correlation between these two methods. Compared with extraction method, DSC is easier and more cost efficient.
THE FOAMABILITY OF POLYPROPYLENE COPOLYMER BLOWN WITH ARGON NITROGEN AND HELIUM
Due to environmental concerns research has been carried out to investigate the feasibility of using inert gases as blowing agents in plastic foaming processes.However the foamability of polypropylene copolymer blown with argon nitrogen and helium has not been reported previously. This paper investigates the nucleating powers of these gases to foam polypropylene copolymer by studying the polymeric foaming processes in situ.
EVALUATION OF ENVIRONMENTAL STRESS CRACKING RESISTANCE IN POLYETHYLENES: BENT STRIP VS. CONSTANT-TENSILE-LOAD METHODS
For a group of 14 polyethylenes (PE) with different densities (0.924 to 0.966 g/cm3) and melt flow index, MFI (0.38 to 42 dg/min), the Environmental Stress Cracking Resistance (ESCR) of each PE was determined by the typical method of bent strip or ESCR at constant strain.The results were compared with those obtained by the evaluations of ESCR by constant-tensile-load method. For both methods the effects of the density and MFI on ESCR were similar and in agreement with those reported in the literature. However, the failure time spread measured in the ESCR at constant load is smaller, although both methods lead to high experimental errors, attributed to limitations or omissions in the experimental protocols described in the standards used for these measurements.
EVALUATION OF ENVIRONMENTAL STRESS CRACKING RESISTANCE IN POLYETHYLENES: BENT STRIP VS. CONSTANTTENSILE- LOAD METHODS
For a group of 14 polyethylenes (PE) with different densities (0.924 to 0.966 g/cm3) and melt flow index MFI (0.38 to 42 dg/min) the Environmental Stress Cracking Resistance (ESCR) of each PE was determined by the typical method of bent strip or ESCR at constant strain. The results were compared with those obtained by the evaluations of ESCR by constant-tensile-load method. For both methods the effects of the density and MFI on ESCR were similar and in agreement with those reported in the literature. However the failure time spread measured in the ESCR at constant load is smaller although both methods lead to high experimental errors attributed to limitations or omissions in the experimental protocols described in the standards used for these measurements.
EXTENTIONAL FLOW MIXING PROVIDES MECHANICAL PROPERTIES IMPROVEMENTS FROM UNTREATED NANOCLAY COMPOSITES
Nanoclay composites require inclusion of chemicals such as surface coatings and compatibilizers to achieve required physical performance. However these chemicals are costly not environmentally friendly and their use restricts the commercial applications. This research covers the use of a new extensional flow mixer which can make nanocomposites without chemical additives and give comparable results to conventional technology which does use these chemical additives. The significance is the elimination of the need for the expensive additives and creating a lower cost product that has food and environmental acceptance.
TRENDS AND NEEDS IN AUTOMOTIVE MATCHED BY VARIOUS PLASTIC SUSTAINABLE SOLUTIONS
An overview is given of the various drivers, needs and trends in the automotive industry and how these are matched by various new plastic solutions, which in the end all significantly increase the sustainability of various car components and of the cars in total.
EXTENTIONAL FLOW MIXING PROVIDES MECHANICAL PROPERTIES IMPROVEMENTS FROM UNTREATED NANOCLAY COMPOSITES
Nanoclay composites require inclusion of chemicals, such as surface coatings and compatibilizers to achieve required physical performance. However, these chemicals are costly, not environmentally friendly, and their use restricts the commercial applications. This research covers the use of a new extensional flow mixer which can make nanocomposites without chemical additives, and give comparable results to conventional technology which does use these chemical additives. The significance is the elimination of the need for the expensive additives, and creating a lower cost product that has food and environmental acceptance.
EXTRUSION FOAMING OF POLYSTYRENE/ACTIVATED CARBON/CARBON NANOPARTICLES USING CARBON DIOXIDE/WATER BLOWING AGENT
Extrusion foaming using supercritical carbon dioxide (CO2) is the most economic and environmentally benign process but it is difficult to control the foam density and maintain the thermal insulation performance. In this study, we added water as a co-blowing agent to better control foam density and introduced carbon nanoparticles/activated carbon (AC) to improve the thermal insulation performance of polystyrene (PS) foam. In order to understand this novel extrusion foaming process, the effects of various parameters such as particle style and content, extruder barrel and die temperatures on foam density, morphology and thermal insulation performance are investigated systematically.
FABRICATION AND CHARACTERIZATION OF POLYMER-BASED SILICA AEROGEL FOR ENHANCED MECHANICAL STABILITY
Silica aerogels have attracted attention for many applications due to their unique properties such as low density (0.003g/cm), mesoporosity (pore size 2-50nm), high thermal insulation and high surface area (500-1200m2/g). However, their fragility and environmental sensitivity restricts the use of monolithic silica aerogel. In this paper, silica aerogel that is cross-linked with diisocyanate is introduced and the effects of polymer concentration on aerogel properties, especially mechanical strength are discussed. Fracture of silicaaerogel mainly occurs at the interface of secondary particles that are formed during aging. It is believed that if the surface of silica aerogel is covalently bonded to nanocast polymer coating, the interparticle necks become wider and can reinforce the structure of the aerogel.
UNDERSTANDING THE COMPATIBILIZATION OF POLYPROPYLENE/POLYSULFONE MEMBRANES
Polypropylene (PP)/polysulfone (PSU) membranes were successfully made using an environmentally-friendly process. Flux amongst other mechanical properties were improved with the introduction of functional polyolefins.Understanding the chemistry and location of the functional polyolefins is critical to explaining these improvements.
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