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    Study, mechanical characterization and mathematical modeling of compatible SEBS blends for industrial applications in orthopedics and childcare

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    "This is an Accepted Manuscript of an article published by Taylor & Francis in Polymer-Plastics Technology and Engineering on JUL 15 2013, available online:www.tandfonline.com/doi/full/10.1080/03602559.2013.763363"In this work, a system of compatible blends based on two commercial grades of a thermoplastic elastomer, styrene-ethylene/ butylene-styrene (SEBS), with extreme Shore A hardness values (5 and 90), was studied in order to obtain a range of different performance blends for orthopedic and childcare applications, where usually liquid silicone rubber is used. Mechanical properties of different blends were obtained, and Equivalent Box Model (EBM) was used for the prediction of the mechanical behavior. The results show good agreement between the theoretical model and experimental data of new blends of SEBS.The authors thank "Ministerio de Ciencia y Tecnologia", Ref: DPI2007-66849-C02-02 and Generalitat Valenciana FPA/2010/027 for financial support.Ju√°rez Var√≥n, D.; Garc√≠a Sanoguera, D.; Ferr√°ndiz Bou, S.; Peydro, MA.; Balart Gimeno, RA. (2013). Study, mechanical characterization and mathematical modeling of compatible SEBS blends for industrial applications in orthopedics and childcare. Polymer-Plastics Technology and Engineering. 52(9):862-868. https://doi.org/10.1080/03602559.2013.763363S862868529Xiao, D., Mo, Y., & Choi, M. M. F. (2003). A hand-held optical sensor for dissolved oxygen measurement. Measurement Science and Technology, 14(6), 862-867. doi:10.1088/0957-0233/14/6/323Sagripanti, J.-L., & Bonifacino, A. (1996). Comparative sporicidal effect of liquid chemical germicides on three medical devices contaminated with spores of Bacillus subtilis. 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    Improving interfacial adhesion in pla/wood biocomposites

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    Two reactive coupling agents, N,N-(1,3-phenylene dimaleiimide) (BMI) and 1,1-(methylenedi-4,1-phenylene)bismaleimide (DBMI) were used to improve interfacial adhesion in PLA/wood composites. First the effect of the coupling agents was established in a series of experiments in which the amount of coupling agent changed at constant wood content, and then the effect of coupling was determined at various wood loadings (0-60 vol%). Composites were homogenized in an internal mixer and compression molded to plates. Tensile properties were determined and micromechanical deformations were studied by acoustic emission measurements. The two compounds improved the properties of the composites. Stiffness, strength and deformability increased simultaneously supplying sufficient proof for coupling. Because of the flexibility of the molecule, DBMI is a more efficient coupling agent in the studied composites than BMI. However, the effect of coupling is small, because only a few very large particles debond under the effect of external load. Smaller particles adhere strongly to the matrix even without coupling proving that interfacial adhesion is strong in PLA/wood composites

    Composite foundations on Malaysian soft clay soil: applications of innovative techniques

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    An innovative technique of electro osmosis coupled with vertical surcharge loading to accelerate the consolidation and stiffen Kaolin (China Clay Grade E) was investigated in this study. The geotechnical properties of this China Clay Kaolin Grade E and the design of electro osmotic consolidation chamber are discussed together with an explanation of the procedural concept of the electro osmotic consolidation chamber (i.e., the preparation of the apparatus and the clay sample, assembling of the electro osmotic consolidation chamber; and the experimental work). The plastic limit, liquid limit and plasticity index were 35%, 53% and 18% respectively. Therefore, China Clay Kaolin Grade E is classified as MH soil, and it is predominantly a silt with high plasticity. The specific gravity of the soil is 2.65. To ensure the kaolin is saturated, all samples were prepared in a similar manner with deaired water to produce a slurry at 150% of the liquid limit (initial moisture content of 79.5%). The electro osmotic consolidation chamber was cylindrical and consisted of the body, the base and the top cap. The body and the base of the chamber were constructed of polyvinyl chloride (PVC) tube with a wall thickness of 10.9 mm, 345 mm high and 251 mm inner diameter. The electro osmotic consolidation chamber was assembled together with a 45 mm thick flange and collar. The top cap of this chamber was based on that of a Rowe cell of similar diameter. Twenty one tests were performed in this study with an applied voltage and one test was a control test. The test samples in the twenty one tests were all consolidated to three different phases. In Phases 1 and 2, the samples were consolidated at 15 kPa while in the Phase 3, 50 kPa was used. The electro osmotic process was only performed during Phase 2. The time of treatment, numbers of electrodes, the arrangement of electrodes, and the applied voltages were investigated in these tests. Results from these tests indicated that the China Clay Kaolin Grade E in a 79.5% slurry form responded well to electro osmotic treatment and that electro osmotic process increased the overall stiffness of the soil as indicated by the reduced relative settlement in Phase 3 with a pressure of 50kPa. The water content around the anodes was less than that at the cathode creating zones of higher average constrained stiffness. The tests demonstrated that the longer the time of treatment, the greater the numbers of anodes, the shorter distance between the electrodes and the higher the applied voltages associated with electro osmosis increased the average stiffness of the soil mass confirming the concept of an electro osmotic pile. Keywords: electro osmotic merged vertical loading and electro osmotic, consolidation, electro osmotic consolidation chamber, stiffening

    Single-crosslink microscopy in a biopolymer network dissects local elasticity from molecular fluctuations

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    Polymer networks are fundamental from cellular biology to plastics technology but their intrinsic inhomogeneity is masked by the usual ensemble-averaged measurements. Here, we construct direct maps of crosslinks-symbolic depiction of spatially-distributed elements highlighting their physical features and the relationships between them-in an actin network. We selectively label crosslinks with fluorescent markers, track their thermal fluctuations, and characterize the local elasticity and cross-correlations between crosslinks. Such maps display massive heterogeneity, reveal abundant anticorrelations, and may contribute to address how local responses scale up to produce macroscopic elasticity. Single-crosslink microscopy offers a general, microscopic framework to better understand crosslinked molecular networks in undeformed or strained states

    Embracing Bacterial Cellulose as a Catalyst for Sustainable Fashion

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    Bacterial cellulose is a leather-like material produced during the production of Kombucha as a pellicle of bacterial cellulose (SCOBY) using Kombucha SCOBY, water, sugar, and green tea. Through an examination of the bacteria that produces the cellulose pellicle of the interface of the media and the air, currently named Komagataeibacter xylinus, an investigation of the growing process of bacterial cellulose and its uses, an analysis of bacterial cellulose’s properties, and a discussion of its prospects, one can fully grasp bacterial cellulose’s potential in becoming a catalyst for sustainable fashion. By laying the groundwork for further research to be conducted in bacterial cellulose’s applications as a textile, further commercialization of bacterial cellulose may become a practical reality

    Role of structure of the Pp/magnetite nanocomposites on their thermal properties

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    The thermal degradation behaviour of polypropylene and its magnetite composites have been investigated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). Distribution of magnetite nanoparticles in a polymer matrix has been studied by scanning and transmission electron microscopy and also atomic force microscopy. The thermal and mechanical properties of nanocomposites based on polypropylene and magnetite nanoparticles have also been investigated. It has shown that, the introduction of Fe3O4 nanoparticles in polypropylene increases its thermal stability of about 1000C. The maximum increase in the thermal stability of PP was observed in the case of a 20% weight content of Fe3O4 nanoparticles in polypropylene

    Nanostructured polymer coatings for controlling the wettability of fibrous surfaces

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    In this research we present a new approach for modifying and functionalizing the surface properties of fibrous substrates, especially cellulose-based products, by the deposition of organic nanoparticle coatings. The partial imidisation of high-molecular weight poly(styrene-maleic anhydride) in presence of ammonium hydroxide results in a stable water-borne dispersion of nanoparticles with sizes of 50 to 100 nm. The hydrophobic properties of coated paper surfaces are governed by a unique combination of chemical (degree of imidisation) and topographic (porosity and roughness) effects: it has been found that the contact angle increases at a higher degree of imidisation and higher surface roughness. As such, maximum advancing contact angles in the range of 140 to 150¬į and receding contact angles of 50¬į can be obtained on paper surfaces
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