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Recycling

Various topics related to sustainability in plastics, including bio-related, environmental issues, green, recycling, renewal, re-use and sustainability.
INVESTIGATIONS OF THE BRITTLE FAILURE CAUSED BY AN ENVIRONMENTAL STRESS CRACKING OF A PLASTIC ENCLOSURE
Ahamed Shabeer, Gerald F. Zamiski, May 2012

The causes of a drastic reduction in the service life of plastic enclosures molded from an acrylonitrilebutadiene- styrene (ABS) resin have been investigated. The mechanism and type of failure have been deduced from a detailed morphological examination of the fracture surface. Various factors responsible for a rapid failure of the enclosure have been identified. Analytical testing such as infrared spectroscopy and differential scanning calorimetry were performed to identify a specific material characteristic responsible for the failure. The results obtained during the evaluation indicated that the failure was due to environmental stress cracking, which occurred as a consequence of the presence of an incompatible chemical and assembly stress. The nature of the chemical agent was found and its effect on the properties of the ABS is discussed.

LAYER MULTIPLYING COEXTRUSION OF POLYLACTIC ACID AND POLYVINYL ALCOHOL CAST FILMS
Jo Ann Ratto, Jeanne Lucciarini, Gregory Pigeon, Danielle Froio, Sarah Schirmer Cheney, Christopher Thellen, Darin Vanderwalker, Ron Walling, Greg Geil and Scott Winroth, May 2012

Layer multiplying coextrusion was utilized to produce a films containing polylactic acid and polyvinyl alcohol for food packaging applications. Control films and films containing 9, 25, 73 and 145 layers were produced. The emphasis of this study was to investigate the processability, morphology, barrier, mechanical and biodegradability properties of these multilayer films. The films showed stable layers, high oxygen barrier and mechanical performance that could all potentially be used in a food packaging applications.

LIFETIME PREDICTION OF PLASTIC PARTS – A CASE STUDY
Paul J. Gramann, Javier Cruz, Jeffrey A. Jansen, May 2012

Lifetime prediction of plastics is a very difficult proposition, but one that is becoming increasingly important as plastics are used in more demanding and critical applications. The lifetime of a plastic part is influenced greatly by many factors including the type of plastic, stress level, temperature, type of loading, and environmental conditions. All these factors make absolute lifetime prediction a nearly impossible task. However, by understanding how these factors influence plastics over time, one can begin to make educated predictions with some level of accuracy. This paper will discuss techniques that can be used to predict the lifetime of a part. A case study is given on how lifetime prediction was used to understand and ultimately solve the cracking of an industrial fan made of glass reinforced polypropylene

MARKET SITUATION AND POSSIBILITIES FOR INFORMATION PROCUREMENT OF BIOPOLYMERS (BIOPOLYMER DATABASE)
Maren Bengs, H.J. Endres, A. Siebert-Raths, May 2012

In the last three years the production capacities of biopolymers increased threefold. The current trend in the development of biopolymers is towards bio-based and durable materials, it veers away from biodegradable and compostable materials. As a result of this change and the significant growing market there is a bottleneck regarding the availability of information and technical data of biopolymers. The biopolymer database offers a knowledge platform about biopolymers with producer data and newly measured comparable properties. The presented comprehensive database reflects the market situation and serves as connection between manufacturers, converters and end users.

MODELLING OF HYGROSCOPIC STRESSES DUE TO NON-UNIFORM LIQUID DISTRIBUTION IN HOMOGENEOUS BIOPLASTICS
Indah Widiastuti, Igor Sbarski, S. Masood, May 2012

In this article, numerical modeling is used to simulate the distribution of liquid diffusion in bioplastic material and to determine the hygroscopic stress. The material used is homogeneous PLA based plastic exposed to aggressive automotive liquid. An analytical one-dimensional liquid diffusion solution is also presented to consider liquid concentration distribution, which shows a remarkable agreement with numerical simulation results. The results display non-mechanical stress distribution inside the homogenous material due to non-uniform liquid concentration profile.

MODIFICATION OF MECHANICAL PROPERTIES OF POLYBUTYLENE SUCCINATE USING IN-SITU COMPATIBILIZATION BLEND WITH POLY(LACTIC ACID)
Benchamas Panyad, Nattakarn Hongsriphan, May 2012

PBS/PLA blends in various blend ratios added GMA to modify their compatibility were prepared using melt blending. Mechanical properties of polymer blends before and after in-situ compatibilization were investigated. Morphology and compatibility of modified blends was studied via SEM and DSC, respectively. PBS/PLA 50:50 wt% added 10 wt% GMA exhibited high percentage of elongation at break in a range of LDPE due to co-continuous structures. This phenomenon also benefited the impact strength of modified blends.

MOLD FLOW ANALYSIS OF MOBILE PHONE CASE MADE BY TPS (THERMOPLASTIC STARCH)/(PC/ABS)
Sheng-Ju Liao, Shihn-Juh Liou, Chih-Jen Chang, May 2012

Mold flow analysis of mobile phone case was used in this study to evaluate the intrinsic characteristics of biomass materials how to influence the parameters of injection mold process and the outward appearance of product. Two materials were selected, one is TPS/(PC/ABS) biomass-based material developed by ITRI, and the other is commercial petrochemical plastic PC/ABS. In addition to evaluate the difference between these two materials in the injection mold process and dimensional stability, carbon emissions during this injection mold process were also calculated. Above results will show advantages and shortcomings of this newly developed TPS/(PC/ABS) biomass-based material.

MORPHOLOGY OF POLY(LACTIC ACID)/POLY(BUTYLENE ADIPATE-CO-TEREPHTHALATE) BLENDS AND ITS COMPOSITE WITH SPHERICAL SILICA PARTICLES
Ebrahim Jalili Dil, Pierre Carreau, Sepehr Ravati, Basil Favis, May 2012

In this work the detailed morphology of poly(lactic acid)/ poly (butylene adipate-co-terephthalate) has been carried out for the first time. The morphology of PLA/PBAT blends with different compositions was studied and limits of the co-continuity region were determined using rheological measurements and image analysis. Particle size analysis and breaking thread experiments showed that PLA/PBAT is a very low interfacial tension polymer blend. Moreover, composites of PLA/PBAT/spherical silica particles were prepared and the localization of silica particles in this blend was studied.

MULTI-COMPONENT BIO-BASED BLENDS WITH POLYLACTIC ACID AND POLYHYDROXYBUTYRATE: MORPHOLOGY AND PHYSICAL PROPERTIES
Sepehr Ravati, Christine Beaulieu, Louise Deschênes, Viêt Cao, Basil Favis, May 2012

Polylactic acid (PLA) and polyhydroxybutyrate (PHB) are two of the most important polymers derived from renewable resources. In this work, the morphology and physical properties of binary blends of PLA/PHB and multi-component blends of PLA/PHB with other commodity polymers such as polystyrene (PS) or biodegradable polymers such as polycaprolactone (PCL), poly (butylene succinate) (PBS), and poly(butylene adipate-co-terephthalate)(PBAT) were examined. Completely biodegradable blends of PLA/PHB/PBAT/PCL and PLA/PHB/PBAT/PBS demonstrated some unique morphologies including triple percolated systems.

MULTICOMPONENT BIODEGRADABLE BLENDS WITH POLY(BUTYLENE SUCCINATE): PARTIAL AND COMPLETE WETTING PHENOMENA
Sepehr Ravati, Basil Favis, May 2012

PBS (Poly(butylene succinate)) is a promising emerging bioplastic with good strength and modulus, however, its elongation at break (EB) is quite low and blends with higher EB materials are a potential route to develop more balanced properties. Blends of PBS with biodegradable polymers including polycaprolactone (PCL), poly(butylene adipate-co-terephthalate) (PBAT), and poly(lactic acid) (PLA) were studied. These blends result in fully-biodegradable blends with completely different thermodynamically stable wetting behaviors and hence, significantly different potential morphological states.

NANOFIBRILLATED CELLULOSE REINFORCED POLYVINYL ALCOHOL: PROPERTIES AND SOLUBILITY OF CARBON DIOXIDE
Yottha Srithep, Lih-Sheng Turng, Ronald Sabo, Craig Clemons, May 2012

Polyvinyl alcohol (PVOH) was mixed with a nanofibrillated cellulose (NFC) fiber suspension in water followed by casting. The transmission electron scanning (TEM) images revealed that the NFC fibers dispersed well in PVOH. The presence of NFC significantly increased the tensile modulus of the nanocomposites nearly threefold and could serve as a nucleating agent, promoting the early onset of crystallization. However, at a higher NFC content, it led to greater thermal degradation of the PVOH matrix.

NEW NON-HALOGEN FLAME RETARDED BIO-DERIVED POLYMER BLENDS DEVELOPMENTS
Jason Zhu, Jing Liu, Patricia Hubbard, Roger Avakian, May 2012

The use of polylactic acid (PLA) in durable applications such as appliances and computers has been limited by PLA’s inherent property shortcomings, such as low impact strength, low heat distortion temperature, and lack of flame retardancy. These issues have been overcome via blending with engineering plastics, applying new compatibilization technology and using unique flame retardant additives. The resultant compositions have an excellent balance between heat resistance, impact resistance and flame retardancy. One such composition achieves a UL 94 rating of V-0 at 1.6 mm thickness, a notched Izod impact value at room temperature up to 11.6 ft-lbs/in and also exceeds a threshold of 100°C in heat distortion temperature (HDT) at 66 psi load. This bio-derived blend with >30% bio-content has exceptional properties and has taken PLA into the realm of engineering plastics. These enhancements will enable PLA to replace petrochemical- based materials in many demanding durable applications.

PHYSICAL VAPOR DEPOSITION AND UV CURABLE COATINGS
Jason T. Eich, Eileen Weber, Phil Abell, Kristy Wagner, Chris Mack, May 2012

Environmental concerns with traditional chrome plating continue to expand. Parts finishers worldwide are searching for alternative that provides the visual appearance and durability of chrome plate, but without the environmental side effects and costs associated with this decades old process. “Chrome look” processes and coatings for decorative and automotive lighting PVD applications have been used in the UV curable coating industry for over twenty years. As development of UV curable coatings for PVD has progressed, so has the understanding of the PVD process and its unique capabilities and applications. This paper will address the current chrome plating process, advantages of PVD as chrome alternative, challenges associated with the various steps and layers of PVD applications, and suggestions for successful implementation of UV/PVD systems.

POLYESTER DEVELOPMENT PROGRESS FOR EXTRUSION BLOW MOLDING APPLICATIONS
Mark A. Treece, Thomas J. Pecorini, May 2012

This work highlights three decades of polyester resin development for the extrusion blow molding (EBM) process. The optimal formulation for a clear EBM material must fulfill three main requirements: process efficiently on existing equipment, produce bottles with robust drop impact performance, and have an acceptable recyclability story. Balancing these criteria in a single formulation is challenging, since obtaining compatibility in the PET recycle stream inherently causes drawbacks to processing and bottle performance. Nevertheless, significant innovation has enabled Eastman to provide the market with a comprehensive portfolio of copolyester technology, suitable for a variety of needs.

RENDERING WATERPROOF AND MULTIFUNCTIONAL FIBROUS SHEETS OF CELLULOSE: FROM PACKAGING AND ANTICOUNTERFEIT TO CONSTRUCTION APPLICATIONS
Despina Fragouli, Ilker S. Bayer, Anese Attanasio, May 2012

We present a scalable, inexpensive and green process to render cellulosic sheets waterproof with additional functional properties (magnetic, photoluminescent, antibacterial, etc.). The fibrous cellulose-based sheets are treated in their final, dry phase, with a huge potential economic impact in the manufacturing industry. Our method is based on the impregnation of cellulose sheets with acrylate monomers and micro or nano-scale functional fillers solutions, which polymerize as soon as they come in contact with the fibers. The formed polymeric nanocomposite creates a cladding around each individual fiber and not an overall coating onto the cellulose sheets. The treated cellulose fibers can be still recycled due to biodegradability of the used polymer.

RHEOLOGY AND MELT FRACTURE OF BIODEGRADABLE POLY (?-CAPROLACTONE) POLYESTERS
Nazbanoo Noroozi, Jaclyn A. Thomson, Laurel L. Schafer, Savvas G. Hatzikiriakos, May 2012

The viscoelastic behaviour of a number of commercial and newly synthesized linear biodegradable polyesters - poly (?-caprolactone) (PCLs) with different molecular characteristics was investigated using both rotational and capillary rheometry. The variation of the zero-shear viscosity and relaxation spectrum with molecular weight was studied in detail. The PCL processing instabilities were studied by capillary extrusion using a number of capillary dies having various diameter and length-to- diameter ratios. Sharkskin and gross melt fracture was observed at different shear rates depending on the molecular characteristics of the resins and the geometrical details of the capillary dies.

SELECTIVE LOCALIZATION OF SPHERICAL SILICA PARTICLES IN HETEROPHASE POLY(LACTIC ACID)/ LOW DENSITY POLYETHYLENE BLENDS
Ebrahim Jalili Dil, Basil Favis, May 2012

In this article, different strategies to control the localization of spherical silica particles in Poly(lactic acid)/ Low density polyethylene blends were studied. These strategies include different sequences of addition of components and compatibilization. Results show that using these different strategies, the controlled localization of silica particles in either the matrix or in the dispersed phase can be achieved. Long processing times used in this study show that the observed localization is stable and does not change with further processing.

SPECIALTIES OF THE PROCESSING OF PLA THROUGH EXTRUSION AND INJECTION MOLDING, AND RESULTING CHARACTERISTICS
Andrea Siebert-Raths, Hans-Josef Endres, Sicco de Vos, May 2012

Next to the established packaging market the interest for biopolymers in technical application increases more and more. Especially the technical industry is interested in substituting oil-based polymers with biopolymers. In view of that, the focus of the work described here was on optimization of injection molding of polylactide (PLA) in order to improve material performance for technical applications. Furthermore, the effects of poly-D-lactide (PDLA) as nucleating agent, fibers and modifiers on material properties (e.g. heat resistance, mechanical properties) are reported.

STRENGTHENING THE MESSAGE OF SUSTAINABLE PLASTICS PACKAGING
Mike Tolinski, May 2012

Recyclable, recycled-content, or bio-based plastics packaging will require more than just the right technologies and materials for sustained growth. Sustainable packaging acceptance and use will also require increasing the number of informed, enthusiastic retailers and packaging consumers interested in being “greener.” In short, their positive attitudes must be turned into buying and recycling behaviors. This paper focuses on one way in which packaging producers are drawing consumers’ attention to the recycled-content, recyclability, or bio-basis of new plastic packaging. Simple messages on the packaging itself not only can clarify green claims about the packaging, but can also serve as calls for consumer action. This paper considers the effectiveness of various messages and, referencing the U.S. Federal “Green Guides,” considers the ways in which a clear, honest sustainability claim can be communicated to both informed and skeptical audiences.

STRUCTURE AND PROCESSING DESIGN OF JUTE SPUN YARN/PLA BRAIDED COMPOSITE BY PULTRUSION MOLDING
Anin Memon, Asami Nakai, May 2012

Currently, the light has shed on the green composite from the view point of environmental protection. Jute fibers are natural fiber superior on light weight, low cost and environmental friendly corresponding to the green composite materials. Meticulously, fibers of polylactic acid (PLA) thermoplastic biopolymer were micro braided around jute spun yarns and paralleled configuration with jute. The pultrusion experiments were done with jute/PLA yarns and combined with glass fiber yarns to fabricate the tubular composite. Impregnation quality was evaluated by microscope observation of the pultruded cross-sections. The flexural mechanical properties of the beams were measured. The jute/PLA tubular pultrude composite using the parallel configuration of yarn showed the highest bending strength 28.3 MPa and modulus 15.4 GPa with the filling ratio 130% and volume fraction 52%.








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