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.
This work examines four polystyrene (PS) resins and PS resins with fillers. The materials .are processed into sheets and then the sheets are foamed at various supercritical conditions. The morphology of foam is studied and a large porous PS foam is also developed for a vacuum insulation panel.
This paper discusses the effects of the blowing-agent content on the expansion behaviours of PS foams blown with CO2. Three groups of interchangeable filamentary dies were used to investigate the effect of the die geometry on the expansion ratio. A high CO2 content would be favourable to increase the expansion ratio. But the high CO2 content increased the solubility pressure and the amount of premature cell growth. When the amount of premature cell-growth exceeded a critical value, the expansion ratios were dramatically decreased, even at the optimum temperature.
Entrained gas for injection molding, such as structural foam, microcellular foam, gas assist processing, has some common technical issues and safety concerns which are important to be fully understood for a safety system, and acceptable processing conditions. Several major issues are addressed and analyzed for machine and mold design, part design and handling.
This work presents the effects of incorporating post-consumer and post-industrial recycled HDPE to their virgin counterparts and to LDPE in different contents to produce tubular film for packaging. Tensile, surface and optical properties for each blend were measured.A reduction in the HDPEs blends physical properties and an increment in those of the LDPE/recycled HDPE blends were obtained as the recycled HDPE component was increased.
Nylon 66 was blended with maleated EPDM containing 0.5% of maleic anhydride. At 25% of maleated EPDM, impact strength increased 8-fold. On the other hand, modulus, strength, and DTUL decreased. The data suggested that the blend was too miscible, and might be improved by decreasing the maleic anhydride content to enhance phase separation.
In three ductile resins, polyphenylene ether sulfone (PPSU), a polycarbonate-acrylonitrile butadiene styrene (PC-ABS) blend and polycarbonate-polybutylene terephthalate blends (PC-PBT) use of a fiberglass coating that has little adhesion (non-bonding) to the resin matrix give superior impact strength compared to a traditional fiber coating with good matrix adhesion. The non-bonding glass gives reduced flexural and tensile strength but has comparable modulus to the traditional glass fibers with good matrix adhesion.
The properties of short glass fiber reinforced poly(acrylonitrile-butadiene-styrene)/Nylon 6 (ABS/PA6) blends were studied using the interfacial adhesion approach. Work of adhesion and interlaminar shear strength values were calculated from experimentally determined interfacial tensions and short beam flexural tests. APS was selected as the coupling agent for the glass fibers because of its compatibility with PA6. Increasing wt% of the PA6 in the short glass fiber reinforced blend increased the tensile strength and tensile modulus.
Inorganic fillers are widely used to improve various properties of polymer materials. The dispersion of inorganic filler would undeniably influence the mechanical properties of a polymer compound. This paper describes the effect of the compounding order on mechanical properties of the PP/HDPE/Talc compounds which were prepared by changing the compounding order during the polymer compounding process. Consequently, the bending modulus and the impact strength of compound was improved, compared to that of general compounding.
Natural Rubber compounds with 15 phr filler (silica, wood flour and carbon black) were evaluated. Maximum torque, modulus, hardness and compression set increased when filler was present. Scorch time and curing time were also increased. A good reinforcement effect on the NR vulcanizate was observed when silica was used. There seemed to be very little influence of filler nature and particle size on properties studied; therefore, woodflour appears as an alternative and environment friendly filler.
Two grades of thermoplastic polyurethane (TPU), one polyester and one polyether based, were blended with two grades of PVC with different K-values of 56 and 71. Mechanical analysis showed that impact strength and elongation at break improved significantly, and the tensile and flexural modulus decreased with progressive increase in TPU content. DMTA results suggested partial miscibility between the two polymers. The performance of the blends was shown to be more dependent on the PVC/TPU percentage content rather than the PVC or TPU type.
Steel wire reinforced polyethylene composite pipelines are a new technology product. The system is used for transport of oil, water, gas, and chemicals. This paper explains its new design concepts including micro-mechanics of load sharing and stress transfer. Recent test results will be reported to bring out its advantages over common plastic pipe and steel pipe.
This study involves a failure analysis on polyethylene liner pipes that had been installed as a corrosion protection liner in a high-pressure steel pipeline, operated at pressures up to 1500 psig. The peculiar fracture surface features are attributed to the stresses applied in service and to the geometry of the host pipe. The field failure times correlated extremely well with the published stress-rupture performance of the material.
The Who, What, When and Where of every manufacturing process is critical to the longterm performance of polyethylene (PE) valves in natural gas distribution service. To obtain and archive this knowledge about every process, Kerotest developed POLYTRAC©, a full forward and backward traceability program for the POLYBALL™ line of PE ball valves. With full traceability, one has the maximum assurance that all manufacturing processes are under control and the highest quality valve is being produced.
The heat transfer in a batch mixer was studied using experiments and simulation. The mechanical torque was measured experimentally. The dissipated power was calculated and compared with the simulation. The heat transfer coefficient from experiment was calculate by a lumped approximation and compared with the data from simulation. The transient temperature profiles were obtained and the temperature distributions in the nip between rotors and barrel wall were shown.
Injection moulded propylene-ethylene block copolymer samples containing 0-8% fluorescent organic pigment were prepared. Mechanical and thermal analysis were performed within one week after processing and then again after 8 weeks. The results show that after natural ageing of the samples there were significant improvements in mechanical performance and a modification in the structure of the samples.
Epoxy-based adhesives for bonding aluminum substrates have gathered significant interest in recent years. Yet, more work is needed to learn how epoxy adhesives withstand creep and exposure to various environmental conditions. In this study, both experimental and modeling work (using Ngai's Coupling) has been conducted to predict creep behavior of epoxy adhesives under moisture exposure.
Nylon-6/clay nanocomposites with varying clay aspect ratios and particle orientations were prepared by a large-scale simple shear process, which alters the morphology within the nanocomposite. Tensile tests indicate that the modulus and strength of the nanocomposites decrease as both the clay aspect ratio and orientation are reduced. In nylon-6, however, the reduction of the clay aspect ratio and orientation leads to an increase in toughness and ductility.
The morphology and mechanical properties of glass fiber reinforced PC/ABS injection moldings were investigated. The effects of injection speed on them and the correlation between them were discussed. The morphology was drastically changed by ultra-high speed injection. The orientation of glass fibers was also changed and it results in lower decrease of tensile properties than injection moldings at common injection speed.
Bast fibers like flax, hemp or kenaf have excellent mechanical properties which predestine these fibers for reinforcement of composites. The real mechanical properties of the fibers were measured. Diameter of fibers, tensile strength, modulus of elasticity and breaking elongation are available.
A study of crystallization behavior and stretching of syndiotactic polystyrene cast film are considered. The isothermal crystallization rate of syndiotactic polystyrene was faster than isotactic polystyrene but slower than isotactic and syndiotactic polypropylene at the same ?T(?T=Tm–Tc). The birefringences of stretched films were developed faster than atactic polystyrene according to their stretching ratio. The crystalline orientation was represented in terms of stretching ratio.
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Brown, H. L. and Jones, D. H. 2016, May.
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ANTEC 2016 - Indianapolis, Indiana, USA May 23-25, 2016. [On-line].
Society of Plastics Engineers
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