Relevant bibliographies by topics / Polymeric masters

Academic literature on the topic 'Polymeric masters'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Polymeric masters"

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TANG, YUZHAO, XIAODONG ZHANG, JIELIN SUN, JUN HU, FENG ZHANG, and JIANHUA HE. "PEPTIDE NANOFILAMENTS USED FOR REPLICA-MOLDING: A COMBINATION OF "BOTTOM-UP" AND "TOP-DOWN"." Surface Review and Letters 14, no. 02 (April 2007): 301–7. http://dx.doi.org/10.1142/s0218625x07009396.

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A novel nanofabrication method that combines both "bottom-up" (template-assisted peptide self-assembling) and "top-down" (replica molding) techniques is introduced. A designer peptide, GAV-9 (NH2-VGGAVVAGV-CONH2), can epitaxially self-assemble into nanofilaments on the surface of mica, which is further used as the diversified masters for the application of replica molding. With in situ atomic force microscopy monitoring, several typical masters are fabricated by peptide self-assembling on the surface of mica. These masters can be easily molded into hard poly(dimethylsiloxane) surfaces, and then further replica-molded into polyurethane surfaces. The polymeric surfaces with regular 1D and 2D patterns on the nanometer scale are expected to have new applications in nanostructure's fabrication.
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Fu, Yangxi, Marcos Soldera, Wei Wang, Bogdan Voisiat, and Andrés Fabián Lasagni. "Picosecond Laser Interference Patterning of Periodical Micro-Architectures on Metallic Molds for Hot Embossing." Materials 12, no. 20 (October 18, 2019): 3409. http://dx.doi.org/10.3390/ma12203409.

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In this work, it is demonstrated that direct laser interference patterning (DLIP) is a method capable of producing microtextured metallic molds for hot embossing processes. Three different metals (Cr, Ni, and Cu), relevant for the mold production used in nanoimprinting systems, are patterned by DLIP using a picosecond laser source emitting at a 532 nm wavelength. The results show that the quality and surface topography of the produced hole-like micropatterns are determined by the laser processing parameters, such as irradiated energy density and the number of pulses. Laser-induced periodic surface structures (LIPSS) are also observed on the treated surfaces, whose shapes, periodicities, and orientations are strongly dependent on the accumulated fluence. Finally, the three structured metals are used as embossing molds to imprint microlenses on polymethyl methacrylate (PMMA) foils using an electrohydraulic press. Topographical profiles demonstrate that the obtained structures are comparable to the masters showing a satisfactory reproduction of the texture. The polymeric microlens arrays that showed the best surface homogeneity and overall quality were those embossed with the Cr molds.
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Pezzuoli, Denise, Elena Angeli, Diego Repetto, Patrizia Guida, Giuseppe Firpo, and Luca Repetto. "Increased Flexibility in Lab-on-Chip Design with a Polymer Patchwork Approach." Nanomaterials 9, no. 12 (November 25, 2019): 1678. http://dx.doi.org/10.3390/nano9121678.

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Nanofluidic structures are often the key element of many lab-on-chips for biomedical and environmental applications. The demand for these devices to be able to perform increasingly complex tasks triggers a request for increasing the performance of the fabrication methods. Soft lithography and poly(dimethylsiloxane) (PDMS) have since long been the basic ingredients for producing low-cost, biocompatible and flexible devices, replicating nanostructured masters. However, when the desired functionalities require the fabrication of shallow channels, the “roof collapse” phenomenon, that can occur when sealing the replica, can impair the device functionalities. In this study, we demonstrate that a “focused drop-casting” of h-PDMS (hard PDMS) on nanostructured regions, provides the necessary stiffness to avoid roof collapse, without increasing the probability of deep cracks formation, a drawback that shows up in the peel-off step, when h-PDMS is used all over the device area. With this new approach, we efficiently fabricate working devices with reproducible sub-100 nm structures. We verify the absence of roof collapse and deep cracks by optical microscopy and, in order to assess the advantages that are introduced by the proposed technique, the acquired images are compared with those of cracked devices, whose top layer, of h-PDMS, and with those of collapsed devices, made of standard PDMS. The geometry of the critical regions is studied by atomic force microscopy of their resin casts. The electrical resistance of the nanochannels is measured and shown to be compatible with the estimates that can be obtained from the geometry. The simplicity of the method and its reliability make it suitable for increasing the fabrication yield and reducing the costs of nanofluidic polymeric lab-on-chips.
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Hu, H.-W. "Master Curve of Creep in Polymeric Off-Axis Composite Laminates." Journal of Mechanics 22, no. 3 (September 2006): 229–34. http://dx.doi.org/10.1017/s1727719100000873.

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AbstractAn approach to establish a master curve for effective creep compliances of polymeric off-axis composites with various fiber orientations was presented. Carbon/epoxy composite IM7/977–3 was used to fabricate four types of off-axis specimens and then subjected to momentary creep tests after a period of initial aging. Creep compliance and elastic compliance were separated from the total compliance. Using one-parameter creep potential theory, creep compliances were transformed to effective creep compliances. After choosing a proper value for the one-parameter, all effective creep compliances with various off-axis fiber orientations were superposed into a master curve. This master curve enables us to obtain creep compliance with any off-axis fiber orientation by testing only one off-axis specimen.
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Nega, Ainalem, Behzad Ghadimi, and Hamid Nikraz. "Developing Master Curves, Binder Viscosity and Predicting Dynamic Modulus of Polymer-Modified Asphalt Mixtures." International Journal of Engineering and Technology 7, no. 3 (June 2015): 190–97. http://dx.doi.org/10.7763/ijet.2015.v7.790.

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Hsu, Fang Chang, In Chung Wu, and Chi Ting Ho. "Fabrication of a Polymeric Ridge Waveguide Filter Using a Replication Process." Applied Mechanics and Materials 321-324 (June 2013): 443–46. http://dx.doi.org/10.4028/www.scientific.net/amm.321-324.443.

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The traditional wavelength filter only have one face of grating, the gratings length must be long enough to obtain good filtering result, so the filter device can not be made to a small size. We describe a procedure for rapidly and conveniently prototyping Bragg grating on the three side of the polymer ridge waveguide using holographic interferometry and micro-molding processes. In this experiment, the master of the periodic structure was created on an i-line submicrometer positive photoresist film by a holographic interference using a He-Cd (325nm) laser. A subsequent mold using polydimethylsiloxane (PDMS) polymer was cast against this master and used as a stamp to transfer the grating pattern onto a UV cure epoxy. The technique shows accurate control for the transferring of a gratings period and depth. It can obtain the filtering result with very short grating length which means that it can be made with a small filtering device.
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MIZUNO, HIROTAKA, OKIHIRO SUGIHARA, TOSHIKUNI KAINO, YUKA OHE, NAOMICHI OKAMOTO, and MASAHITO HOSHINO. "THICK PHOTORESIST ORIGINAL MASTER: A NEW TOOL FOR FABRICATION OF POLYMERIC OPTICAL WAVEGUIDES WITH LARGE CORE BY HOT EMBOSSING." Journal of Nonlinear Optical Physics & Materials 13, no. 03n04 (December 2004): 513–17. http://dx.doi.org/10.1142/s0218863504002183.

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A simple and low-cost fabrication method of polymeric optical waveguides with large core sizes for plastic optical fibers is presented. The waveguides are fabricated by hot embossing with a rectangular ridge ultraviolet (UV)-cured epoxy resin stamper. The stamper is fabricated by replication of a rectangular groove mold that is made from silicone rubber replicated from a rectangular ridge original master made from thick photoresist (SU-8). A rectangular ridge shape of the original photoresist master of 1 mm size was realized by using a flattening process, which involves hot embossing before the exposure process and using a UV-cut filter during the exposure process.
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Ye, Huichun, Lianguan Shen, Mujun Li, and Likai Li. "A Microlens Array with Different Focal Lengths Fabricated by Roll-To-Roll UV Lithography." Polymers and Polymer Composites 26, no. 2 (February 2018): 155–59. http://dx.doi.org/10.1177/096739111802600203.

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A simple, highly efficient and low cost roll-to-roll (R2R) UV imprinting lithography facility was achieved for fabricating micro-structures. Firstly, a novel microlens array with focuses distributed on a curved surface was designed and analyzed by an optical software ZEMAX. Then an ultra-precision diamond machine was applied to generate the freeform microlens array features on the master mold, and a belt-type polydimethylsiloxane (PDMS) mold with a microlens array pattern was prepared from the machined master mold. The R2R process was employed to replicate the microlens arrays, followed by an evaluation of their profiles and optical properties. Our experiments demonstrate that the applied method is reliable and efficient for producing the polymeric microlens arrays.
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Umemoto, Sususmu, and Norimasa Okui. "Master curve of crystal growth rate and its corresponding state in polymeric materials." Polymer 43, no. 4 (February 2002): 1423–27. http://dx.doi.org/10.1016/s0032-3861(01)00707-8.

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Li, Hai-Fang, Jin-Ming Lin, Rong-Guo Su, Zong Wei Cai, and Katsumi Uchiyama. "A polymeric master replication technology for mass fabrication of poly(dimethylsiloxane) microfluidic devices." ELECTROPHORESIS 26, no. 9 (May 2005): 1825–33. http://dx.doi.org/10.1002/elps.200410357.

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Dissertations / Theses on the topic "Polymeric masters"

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Bozkurt, Emrah Tanoğlu Metin. "Mechanical and thermal properties of non-crimp glass fiber reinforced composites with silicate nanoparticule modified epoxy matrix/." [s.l.]: [s.n.], 2006. http://library.iyte.edu.tr/tezler/master/makinamuh/T000517.pdf.

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Thesis (Master)--İzmir Institute of Technology, İzmir, 2006
Keywords: polymer composites, Nanoparticles, glass fiber, mechanical properties, thermal properties. Includes bibliographical references (leaves 75-79).
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Metin, Dildare Tıhmınlıoğlu Funda. "Interfacial enhancement of polypropylene-zeolite composites/." [s.l.]: [s.n.], 2002. http://library.iyte.edu.tr/tezler/master/kimyamuh/T000132.pdf.

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Işık, Kıvanç Tanoğlu Metin. "Layered silicate/polypropylene nanocomposites/." [s.l.]: [s.n.], 2006. http://library.iyte.edu.tr/tezler/master/makinamuh/T000532.pdf.

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Gemili, Seyhun Altınkaya Sacide Alsoy. "Preparation And Characterization of Antimicrobial Polymeric Films For Food Packaging Applications/." [s.l.]: [s.n.], 2007. http://library.iyte.edu.tr/tezler/master/kimyamuh/T000651.pdf.

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Dağtepe, Pınar Elmacı Nuran. "A computational study on the structure of allene polymers by using quantum chemical methods/." [s.l.]: [s.n.], 2005. http://library.iyte.edu.tr/tezler/master/kimya/T000348.pdf.

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Ocak, Yılmaz Sofuoğlu Aysun. "Protection of the marble monument surfaces by using biodegradaple polymers/." [s.l.]: [s.n.], 2007. http://library.iyte.edu.tr/tezlerengelli/master/cevremuh/T000625.pdf.

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Gültekin, Naz Tıhmınlıoğlu Funda. "Preparation And Characterization of Hydroxyopatite And Polymer Composite Biomaterials/." [s.l.]: [s.n.], 2002. http://library.iyte.edu.tr/tezler/master/biyoteknoloji/T000148.rar.

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Karal, Kazım Tanoğlu Metin. "Tribological Behaviour of Polymer Nanocomposities Containing Tungsten Based Nanoparticles/." [s.l.]: [s.n.], 2007. http://library.iyte.edu.tr/tezler/master/malzemebilimivemuh/T000664.pdf.

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Seyhan, Abdullah Tuğrul Tanoğlu Metin. "Processing and characterization of polymer based composites with superior impact resistance/." [s.l.]: [s.n.], 2003. http://library.iyte.edu.tr/tezler/master/malzemebilimivemuh/T000304.rar.

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Topçuoğlu, Özge Alsoy Altınkaya Sacide. "Sorption and transport of water vapour in Acrylic Paints/." [s.l.]: [s.n.], 2004. http://library.iyte.edu.tr/tezler/master/kimyamuh/T000498.pdf.

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Books on the topic "Polymeric masters"

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Tamara, Honaman, ed. Polymer clay master class: 11 master artists, 15 projects, incredible inspiration. New York: Potter Craft, 2012.

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American Chemical Society. Committee on Professional Training. Directory of graduate research 1999: Faculties, publications, and doctoral and master's theses in departments or divisions of chemistry, chemical engineering, biochemistry, medicinal/pharmaceutical chemistry, clinical chemistry, polymer science, food science, forensic science, marine science, toxicology, materials science, and environmental science at universities in the United States and Canada. [Washington, DC]: American Chemical Society, 1999.

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Masters Major Works By Leading Artists. Lark Books (NC), 2011.

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Polymer Electronics Oxford Master Series in Physics. Oxford University Press, 2013.

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Polymer Clay 101: Master Basic Skills and Techniques Easily Through Step-By-Step Instruction. Quarto Publishing Group USA, 2011.

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Mabray, Angela, and Kim Otterbein. Polymer Clay 101: Master Basic Skills and Techniques Easily Through Step-By-Step Instruction. Quarto Publishing Group USA, 2011.

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Nickelsen, Alyona. Colored Pencil Painting Portraits: Master a Revolutionary Method for Rendering Depth and Imitating Life. Watson-Guptill, 2017.

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American Chemical Society. Committee on Professional Training. Directory of graduate research 2011: Faculties, publications, and doctoral and master's theses in departments or divisions of chemistry, chemical engineering, biochemistry, medicinal/pharmaceutical chemistry, polymers and materials science, toxicology, marine science, and environmental science at universities in North America. 2011.

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Book chapters on the topic "Polymeric masters"

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Gooch, Jan W. "Master Curve." In Encyclopedic Dictionary of Polymers, 447. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_7226.

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Frigio, Francesca, Gilda Ferrotti, and Fabrizio Cardone. "Fatigue Rheological Characterization of Polymer-Modified Bitumens and Mastics." In RILEM Bookseries, 655–66. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-017-7342-3_53.

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Ahmad, Shaik Faazil, and T. Jagadeesha. "Dynamic Characteristics Analysis of Kirloskar Turn Master35 Machine Tool Bed with Different Polymer Concrete Materials." In Modeling, Simulation and Optimization, 329–38. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-0836-1_24.

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Lin, J., B. Hong, T. S. Li, D. W. Wan, Z. P. Fan, and Sabine Leischner. "Recycling of waste Glass Fiber Reinforced Polymer (GFRP) power as alternative filler for asphalt mastics." In Green and Intelligent Technologies for Sustainable and Smart Asphalt Pavements, 525–30. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003251125-83.

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"Master curve." In Encyclopedic Dictionary of Polymers, 599. New York, NY: Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-30160-0_7114.

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"The Kramers Problem and Polymer Physics." In Master of Modern Physics, 93–108. Princeton University Press, 2020. http://dx.doi.org/10.2307/j.ctv15r58p1.10.

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"6 The Kramers Problem and Polymer Physics." In Master of Modern Physics, 93–108. Princeton University Press, 1998. http://dx.doi.org/10.1515/9780691219523-007.

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"PART 177—INDIRECT FOOD ADDITIVES: POLYMERS." In The CRC Master Keyword Guide for Food, 828–946. CRC Press, 2003. http://dx.doi.org/10.1201/9780203504529-56.

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"Master Curves of Viscoelastic Coefficients of Matrix Resin." In Durability of Fiber-Reinforced Polymers, 17–32. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2017. http://dx.doi.org/10.1002/9783527811984.ch3.

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Ramesh, M. "Polypropylene/Clay Nanocomposites." In Materials Research Foundations, 203–32. Materials Research Forum LLC, 2022. http://dx.doi.org/10.21741/9781644902035-9.

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Polymers play a vital role in material science; they have been utilised for more than a century. Cosmetics, geotextiles, aircraft, and automobiles are just a few of the sectors that employ polypropylene. The addition of appropriate clay, can improve the mechanical and barrier characteristics of the material. This chapter deals with various types of fabrication as extrusion process by using twin screw extruder, solution blending method, melt-blending method, in-situ polymerization method, direct melt compounding, ultra sound-aided extrusion and master batch dilution. To characterize the polypropylene/clay nano composites by different property such as mechanical, thermal, tribological, optical, viscoelasticity, viscoplasticity, creep failure, hygrothermal, rheological and morphological.
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Conference papers on the topic "Polymeric masters"

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Rowland, Harry D., Joseph L. Charest, Tanya L. Wright, and William P. King. "Transport During Hot Embossing Micro-Manufacturing Studied via Stylus Profilometry and SEM." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-41838.

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This work investigates processing parameters affecting replicated feature size during hot embossing micro-manufacturing. Silicon micromachined masters were heated and pressed into polymer layers of different thermophysical properties. Imprinting with loads ranging from 20–35 MPa, load rates from 1–15 MPa/sec, load times from 90–115 sec, and imprint temperatures at, below, and above the polymer glass transition temperature (Tg) replicated features in polymer with varying degrees of conformity. Replicated features were measured by profilometry and inspected by scanning electron microscopy, revealing polymer feature heights ranging from 25–100% conformal matching of silicon master features and polymer feature widths closely matching the period of features on the silicon master. Statistical analysis determined replicated feature height was positively dependent on tip sharpness, master feature height, temperature, and load rate while negatively dependent on master feature width. Replicated feature width was found to depend positively on master feature height and width, temperature, load rate, and load time. Optimization of imprint parameters during hot embossing micro/nano-manufacturing can possibly lead to a high-throughput manufacturing process offering nanometer resolution.
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Chae, Seung-Hyun, Jie-Hua Zhao, Darvin R. Edwards, and Paul S. Ho. "Characterization of Viscoelasticity of Molding Compounds in Time Domain." In ASME 2009 InterPACK Conference collocated with the ASME 2009 Summer Heat Transfer Conference and the ASME 2009 3rd International Conference on Energy Sustainability. ASMEDC, 2009. http://dx.doi.org/10.1115/interpack2009-89388.

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Although polymer-based materials are widely used in microelectronics packaging and viscoelasticity is an intrinsic characteristic of polymers, viscoelastic properties of polymeric materials are often ignored in package stress analyses due to the difficulty of measuring this property. However, it is necessary to consider the viscoelastic behavior when an accurate stress model is required. Viscoelastic properties of materials can be characterized either in the time domain or frequency domain. In this study, stress relaxation experiments were performed on a molding compound in the time domain. Prony series expansion was used to express the material’s relaxation behavior. Thermo-rheologically simple model was assumed to deduce the master curve of relaxation modulus using the time-temperature equivalence assumption. Two methods were compared to determine the Prony pairs and shift factor.
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Nagarajan, Pratapkumar, and Donggang Yao. "Rubber-Assisted Hot Embossing for Structuring Thin Polymer Film Polymeric Films." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-15297.

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Precision structured polymer thin films with microstructures comparable to or greater than the film thickness are highly desired in many applications. Such micro-patterned thin films, however, are difficult to fabricate using the standard hot embossing technology where both halves of the mold are made of hard materials. This study investigated a rubber-assisted embossing process for structuring thin polymer films. The advantages of the rubber backup instead of a hard support include but are not limited to 1) simplifying the embossing tool, 2) protecting the embossing master, 3) facilitating embossing pressure buildup, and 4) accommodating conformal forming of microscale shell patterns. Several design and process variables including rubber hardness, embossing temperature, embossing pressure and holding time were carefully studied. Thin polystyrene films in a thickness of 25 μm were accurately patterned with microgrooves of characteristic dimensions on the order of 100 μm.
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Altomare, L., S. Fare`, L. Draghi, and M. C. Tanzi. "Effect of Microgrooved Surfaces on Fibroblast Cells Orientation." In ASME 8th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2006. http://dx.doi.org/10.1115/esda2006-95487.

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It is well known that cells can interact with patterned surfaces; although the mechanisms are still not clear, substrata containing periodic patterns of parallel grooves can impose directional constraints on cells and affect the rate and direction of cell migration. The aim of our work is to evaluate the possibility of replicating microgrooved surfaces by soft lithography and to assess, in vitro, the influence of three different microgrooved surfaces on fibroblasts alignment. Microgrooved substrata were obtained by Replica Molding out of two different polymers: PLLATMC and ChronoFlex AL from three different masters. From each master, a silicon mold was prepared and the polymers were casted in the mold using chloroform as solvent. By SEM and laser profilometry analysis we observed a good reproducibility of the different surfaces. The obtained results indicate that Replica Molding technique is an accurate method to reproduce a wide number of micropatterned surfaces with different polymers. In vitro tests with L929 murine fibroblasts showed different degrees of cellular alignment and elongation depending on grooves width.
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Han, Jeongwon, Jungmo Yang, Byung Soo William Lee, and Shinill Kang. "Fabrication of Metallic Stamp With 30 nm Hole Array Using UV Nanoimprinting and Nanoelectroforming." In ASME 2008 International Manufacturing Science and Engineering Conference collocated with the 3rd JSME/ASME International Conference on Materials and Processing. ASMEDC, 2008. http://dx.doi.org/10.1115/msec_icmp2008-72237.

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With increasing demands for products with nano scale patterns manufactured by nanoreplication processes such as nanoinjection molding, nanoimprinting, and etc, fabrication of molds or stamps with nano patterns has become a priority for successful manufacturing of nano patterned products. In this study, a metallic stamp with nano hole array pattern was fabricated by ultra-violet (UV) nanoimprinting process and nanoelectroforming process. For the fabrication of the original silicon master, electron-beam (E-beam) lithography and inductively coupled plasma (ICP) etching process were used. Polymeric nano pillar array pattern, called polymeric master, was replicated from the original silicon master by UV nanoimprinting process. For the successful demolding during UV nanoimprinting process, self assembled monolayer (SAM) of fluoroctatrichlorosilane (CF3(CH2)8SiCl3) was deposited on the original silicon master. With this approach, the expensive silicon master could be reused many times as a master mold. Nickel seed layer as conductive layer was deposited onto the polymeric master using sputtering process. Nanoelectroforming process using nickel sulfamate solution (Ni(NH2SO3)2·4H2O) was carried out to fabricate the metallic nano stamp. Metallic nano stamp which has hole array pattern with diameter of 30 nm and pitch of 50 nm was successfully fabricated by the proposed method. Nanoinjection molding of 30 nm pillar array pattern as a nano data storage media using the present metallic stamp is the subject of ongoing research.
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Dirckx, Matthew, Aaron D. Mazzeo, and David E. Hardt. "Production of Micro-Molding Tooling by Hot Embossing." In ASME 2007 International Manufacturing Science and Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/msec2007-31046.

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Tooling is especially critical for micro-molding of polymers because the tool defines the geometry of the finished part. Various tool materials and processes have been demonstrated, including etched silicon, machined or electroformed metal, and molded polymers. Adhesion of the part to the tool and differential thermal contraction are frequently cited problems related to micro-molding tooling. Brittle silicon tools are particularly vulnerable to failure during demolding because of adhesion and thermal stress. The current work demonstrates the production of micro-molding tools by hot embossing of thermoplastics. Polymer materials for working tools are selected on the basis of high heat deflection temperature and high interfacial tension with the polymer being embossed. The high thermal resistance of the working tool material enables its use in hot embossing of materials with lower glass transition temperature such as polymethyl-methacrylate and cyclo-olefin-polymer, as well as other micro-molding processes. The high interfacial tension reduces adhesion between the master mold and the final part, reducing loads on the tools and facilitating demolding. Embossing parameters for a variety of working tool materials, as well as replication fidelity of the working tools and parts and tool-part adhesion are explored. Polymer working tools produced by hot embossing show great promise for manufacturing polymer micro-devices.
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Kamel, Ahmed H. "A Comparative Investigation of Rheological and Flow Behavior Among Clean Polymeric and Surfactant Based Fluids." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-65133.

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This study involves experimental investigation of rheological and hydraulic characteristics of aqueous based polymeric and surfactant fluids in straight and coiled tubing. The fluids matrix includes guar, HPG, PHPA, welan, xanthan, and surfactant. Bohlin rheometer was used to evaluate rheological and viscoelastic characteristics. For hydraulic characteristics, small- and large-scale flow loops were used. It is observed that all fluids exhibit comparable non-Newtonian behavior and improved viscous and elastic properties. Among polymeric fluids, guar and welan provide better viscosity and suspension properties. Surfactant is significantly affected by the formation of rod-like micelles and other microstructures. Master curves for rheological and elastic properties are developed using the molecular theory approach. The foremost benefit of these curves is its dimensionless form that provides a unique technique to predict viscosity for all fluids. For hydraulic properties, friction losses in coiled tubing are significantly higher than in straight tubing due to centrifugal forces and secondary flows. Surfactant is more sensitive to shear field applied where different microstructures are induced and thus they exhibit better drag reduction characteristics than polymeric fluids especially in coiled tubing with larger sizes. However, in straight tubing, guar shows better drag reduction characteristics than surfactant and other polymers, which diminishes as tubing size increases. However, welan gum exhibits a comparable performance. Overall, all fluids are considered good candidates as fracturing fluids with specific features for each. Unique characteristics of each fluid is discussed and explained in more details within the context of the present paper.
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Butaud, Pauline, Morvan Ouisse, Vincent Placet, and Emmanuel Foltête. "Experimental Investigations on Viscoelastic Properties of a Shape Memory Polymer." In ASME 2014 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/smasis2014-7686.

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The shape memory polymers (SMPs) are polymeric smart materials which have the remarkable ability to recover their primary shape from a temporary one under an external stimulus. The study deals with the synthesis and the thermo-mechanical characterization of a thermally-actuated SMP, the tBA/PEGDMA, with a special focus on viscoelastic properties. The mechanical characterization is performed using three kinds of tests: quasi-static tensile tests, dynamic mechanical analysis (DMA) and modal tests. The first one allows the identification of the Youngs modulus and the Poisson’s ratio at ambient temperature. Modal analyses are done for various temperature values, and resonance frequencies are measured. In order to validate the time-temperature equivalence on this SMP, a DMA is performed under harmonic loading for different temperatures and a master curve highlights a complementarity of the results. Finally a suitable model for the viscoelastic behavior of the SMP is identified.
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9

Cui, Tong, C. W. Lin, C. H. Chien, Y. J. Chao, and J. Van Zee. "Service Life Prediction of Liquid Silicone Rubber Seal in PEM Fuel Cells." In ASME 2010 8th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2010. http://dx.doi.org/10.1115/fuelcell2010-33162.

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Proton exchange membrane fuel cell (PEMFC) is a promising power source for automobiles in the near future. During operation, there are gases and liquids inside the fuel cell. Sealing around the perimeter of the cell is therefore required to prevent the gases/liquids inside the cell from leaking. Polymers are usually used as the sealing or gasket materials. They in general possess the property of viscoelasticity. The stress relaxation behavior of a polymer, liquid silicone rubber, is studied in this article. Applying the time-temperature superposition, master curve is generated for the prediction of service life of this material used as seals in PEMFC.
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10

Arya, S. K., Manju Arora, and S. K. Gupta. "Pauli master-equation: Charge transportation in conducting polymer." In 2007 International Workshop on Physics of Semiconductor Devices. IEEE, 2007. http://dx.doi.org/10.1109/iwpsd.2007.4472592.

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