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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Tom Thompson, Stephen Andrews, Markus Grob, May 2011
PBT is an engineering plastic used in molding applications where protection against demanding temperature or light exposure environments is necessary to retain useful properties. Heat & light stabilization of PBT was assessed under thermal aging or light exposures. PBT specimens were subjected to oven aging for 600 hours. The loss rate of physical properties, melt stability, and changes in discoloration were observed. Hindered phenolic antioxidants and phosphite stabilizers were evaluated, providing improved physical properties and reduced discoloration. PBT was subjected to WOM & outdoor light weathering. Protection was possible with a UV-absorber or combined with a hindered amine light stabilizer.
Dante Guerra, Jesse Guerra, Xilian Ouyang, Jose Castro, L. James Lee, May 2011
Fiber reinforced polymer composites are used in a wide variety of applications such as aerospace, military, defense, and wind energy industries. In many applications, solid particle erosion damage can be a critical issue. In this study, a novel method of fabricating low-cost nanoparticle thin films or nanopapers for use as a surface protective layer for fiber reinforced polymer composites was developed. Inclusion of these nanopapers through current manufacturing methods has shown increases in solid particle erosion protection of up to 7x. The nanopapers have also shown to increase surface electrical conductivity by as much as 16 orders of magnitude.
Emmanuel Pitia, Robert Weiss, Montgomery Shaw, May 2011
High ion-exchange capacity (IEC) crosslinked nanoparticles were synthesized by an emulsion copolymerization of divinylbenzene and sulfonated styrene (SS) for application as the proton conducting phase in composite proton exchange membranes. The effects of the counterion of the sulfonated styrene monomer, the surfactant and the crosslinking on the ability to stabilize the emulsion to high IEC were studied. Water-insoluble nanoparticles with IEC as high as 5.2 meq/g were achieved using sulfonated styrene with a quaternary alkyl ammonium cation, a non-ionic surfactant and a crosslinking agent in the emulsion formulation. Nanoparticles with diameters of 20 160 nm were achieved.
Bernard Obi, Edwardo Leyva, Venkat Minnikanti, Parvinder Walia, David Bank, May 2011
High resiliency polyurethane foams are used to provide superior comfort in automotive seat designs. A modified Voigt viscoelastic model is used to simulate vibrational transmissivity (dynamic comfort) during ride. The model links dynamic comfort to foam parameters of dynamic modulus and damping. The results from the simulations show that low dynamic modulus coupled with high damping gives optimal comfort. The simulation results also confirm that thinner seating negatively affects dynamic comfort. A dynamic oscillatory hysteresis analysis is used to obtain both the dynamic modulus and damping parameter. There was reasonable agreement between experimentally measured and model predicted vibrational transmissivity.
The molecules of polyhedral oligomeric silsesquioxane (POSS) containing silanol functionalities interacted by hydrogen bonding with sorbitol nucleating agent and formed low viscosity liquid complex during melt processing and finally turned into cylindrical nanoparticles in spun fibers of isotactic polypropylene (iPP). It was found that at the optimum combination of POSS (typically 2-5 wt%) and sorbitol nucleating agent (typically 1 wt%), iPP compounds can be spun into fibers with 40% reduction in diameter compared to unfilled PP, 60% increase in tensile strength and modulus, and 100% increase in yield stress.
Alex Kugel, Jie He, James Bahr, Mohammed Nasrullah, Bret Chisholm, May 2011
A series of poly(1,9-nonamethylene adipamide-co-1,9-nonamethylene terephthalamide) copolymers were produced using melt polymerization and the thermal properties and crystal structure characterized. The results obtained confirmed that the copolymers exhibit isomorphism. As expected, glass transition temperature and the apparent melting temperature increased with increasing terephthalmide content. Using the difference in the apparent melting temperature to the crystallization temperature as a measure of relative crystallization rate, it was observed that crystallization rate decreased as the terephthalamide content of the copolymer was increased from 0 to 50 mole percent but then sharply increased when increased beyond 50 mole percent.
Qingkai Meng, Marie-Claude Heuzey, Pierre Carreau, Daniel De Kee, May 2011
Poly (lactic acid) is an important biopolymer with suitable mechanical properties for construction and packaging applications. The mechanical and thermal properties of PLA can be tailored by compounding reinforcing fillers. PLA nanocomposites based on nanoclay and/or wood flour were prepared by melt extrusion of PLA. Three compatibilizers - maleated polyethylene, maleated polypropylene and maleated poly (lactic acid) were used in PLA/clay/wood nanocomposites. Approaches to control PLA thermal degradation during melt extrusion were examined. Residual catalyst deactivation and molecular weight control by chain extenders were believed to be the most effective and feasible methods.
In this study, the preparation of Low density polyethylene (LDPE)/ZnO nanocomposite and its antibacterial efficiency was analysed. The antibacterial property investigation was performed by colony count tests. Scanning electron microscopy (SEM) was performed to investigate the dispersion effect of LDPE-g-MAH copolymer. Two ZnO nanoparticles sizes were studied and their efficiency was first tested in water suspension. The results show that both an increase in mixing temperature and addition of copolymer improve the antibacterial efficiency of the polymer film.
Indra Kemel, Mark Hoffman, Tania Vodenitcharova, Robert Burford, Alan Whittle, May 2011
This study focused on the effect of titanate coupling agent to the mechanical and fracture properties of PVC nano-CaCO3 composites. The titanate coupling agent is introduced into the PVC nanocomposite through in-situ coupling technique, where the titanate mixed with PVC resin and nano-CaCO3 particles during dry mixing and relies on the high shear force during extrusion to induce coupling reactions and dispersions. This enabled the process to be transferred into existing PVC manufacturing technology. The composites morphology and mechanical properties are examined to understand the effect of titanate coupling agent to the PVC nanoCaCO3 composites.
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. Inspite of using compatibilizers the properties achieved using polypropylene (PP) and waste ground rubber tire (GRT) crumb composites remained inferior. Devulcanized rubber (DR) being more relatively similar to virgin rubber is supposed to perform better than GRT and hence should be a better material for commercializing. This paper presents a statistical analysis of compatibility between DR and PP and also studies the effectiveness of a sulphur cure system in compatibilization.
Michael Thompson, Kent Nielsen, Frank Brandys, Mahdy Mazhary, May 2011
The development of wrinkles in decorative film laminates during processing operations like thermoforming was the focused of this paper so that we may understand the driving factors and develop strategies to overcome. A threshold temperature was identified for our film under which no wrinkles formed, related to the stiffness of its different construction layers. Heating rate was also noted by this study to be an important parameter in wrinkling. The effect is believed to be related to the rate of change in stiffness between the different construction layers in relation to building thermal stresses.
Shaofu Wu, Laura Weaver, Edwardo Leyva, Victor Juarez, May 2011
This paper discusses the dynamic fatigue properties of an olefin thermoplastic elastomer (TPE-O) and how it compares with flexible PVC (f-PVC) and styrene block copolymers based thermoplastic elastomers (TPE-S). The fatigue properties were investigated measuring the change of hysteresis properties as samples are subject to cyclic loads in air at room temperature. Material elastic features are investigated using dynamic mechanical analysis and compression set methods. The effect of aging on physical properties of materials is also investigated. The advantages of the TPE-O in fatigue resistance are discussed and attributed to its structure and morphology.
The economical male vacuum forming process helps to make parts with emboss patterns price competitive, but emboss pattern loss is greater than that observed with a female vacuum forming process. In this study, we developed a emboss-patterned thermoplastic olefin(TPO) sheet crosslinked by electron beam irradiation, to minimize emboss pattern loss incurred during part forming in the male vacuum process by optimizing electron beam irradiation dose and materials compositon in the sheet and the results indicated the improvement of the retention rate of emboss patterns by three-fold with an electron beam irradiation dose of 80 kGy.
Mark Bennett, Kenneth Waeber, Martin Gibler, May 2011
Polycarbonate and Acrylonitrile Butadiene Styrene are materials of choice for many medical, pharmaceutical, and consumer products because of their durability, stability, and high-quality surface finish. As these materials become widely used, failures are occurring more frequently and in situations where generally accepted design approaches and validation testing suggests the materials should perform quite well. This paper will discuss reasons why these failures occur as well as design methodology and life prediction techniques for preventing future failures.
Guillermo Jimenez, Ximena Matamoros, Maria Sibaja, Lisbeth Jimenez, Hennia Cavallini, Maribelle Varqas, Jose Vega, May 2011
High intensive mixing techniques and/or long ultrasonication periods of time are normally used to prepare epopy clay nanocomposites. However this approach is not practical. In this work epoxy clay nanocomposites were prepared using a combination of short times of ultrasonication and hand mixing, therefore making clay chemistry to govern over possible differences in the composite properties. Several types of nanoclay were used in order to investigate clay chemistry on thermal and mechanical properties of the nanocomposites. Flexural test proved to be more sensitive than tensile testing in determining the effect of type and clay content.
In general, conventional hot-plate welding has not kept pace with technology advancements that other widely used plastics joining technologies have experienced. Extol will describe recent advancements in the hot-plate welding process which provide the capability for high-speed welding with precise force, heat and speed control. Each of these key variables (force, heat, and speed) will be discussed with respect to advances in machine design that facilitated precision control resulting in improving the process. These improvements also contributed to more efficient tool design, process setup, cycle time improvements and process innovations allowing for flexibility in product design and material selection.
In the present study, rheo-optical and mechanical properties of amorphous polymers (PS, PC and COC) widely used in engineering field have been investigated. The storage stress-optical coefficient of polystyrene(PS) showed the sign change as the frequency increased. On the other hand, the sign of stress-optical coefficient over the whole frequency region is always positive with respect to polycarbonate(PC). For COC's of different composition, even though the glass transition temperature can vary, the stress-optical coefficient of COCƒ??s with different composition stays almost constant at two extremes.
Phil Hyun Kang, JoonPyo Jeun, Bum Sik Shin, Byoung Ho Noh, Hyun Bin Kim, May 2011
Blends formed of 80 wt% of high-density polyethylene (HDPE) and 20 wt% of ethylene-propylene diene monomer (EPDM) have been added with 3 wt% of triallyl cyanurate (TAC). The thermal and mechanical properties were followed up as a function of e-beam irradiation dose. The results obtained that the values of gel contents, decomposition temperature, tensile strength, and impact strength increase with increasing irradiation dose up to 100 or 150 kGy and then decreased. Additionally, the effect of cross-linking agent of TAC was observed in upgrading of various properties.
A new method to prepare and characterize hydrogels is presented. A polyacrylamide-co-bisacrylamide based crosslinked hydrogel is prepared using thermal curing, without use of a catalyst. This paper discusses the kinetic study of these systems and the effect of curing temperature on the mechanical properties. Finally the concept of prestressed double network hydrogels is introduced where the hydrogel is formed by crosslinking in two steps. The first step is in an unstrained state while the second is in a strained state. The formation of these prestressed double networks along with final mechanical behavior as compared to a single network is discussed.
Byoung-Ho Choi, Rajen Patel, Mehmet Demirors, Kenneth Anderson, May 2011
In this paper, eleven (11) blown (two sampling angles, i.e. MD and CD) and compression molded polyethylene films were prepared and tested by tensile tests and the Elmendorf tear tests. Tear values were analyzed statistically and the variation of the tear data was investigated based on the observation of the tear samples. The effect of tensile properties in a given direction on tear properties in the opposite direction was investigated. The relationship between tear properties obtained from the compression molded film and the blown film were compared and modeled using the geometric mean of tear values.
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ANTEC 2016 - Indianapolis, Indiana, USA May 23-25, 2016. [On-line].
Society of Plastics Engineers
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