Results 301 to 310 of about 180,893 (337)
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Synthesis of PMMA‐PTHF‐PMMA and PMMA‐PTHF‐PST linear and star block copolymers
Journal of Applied Polymer Science, 2004AbstractCombination of cationic, redox free radical, and thermal free radical polymerizations was performed to obtain linear and star polytetramethylene oxide (poly‐THF)‐polymethyl methacrylate (PMMA)/polystyrene (PSt) multiblock copolymers. Cationic polymerization of THF was initiated by the mixture of AgSbF6 and bis(4,4′ bromo‐methyl benzoyl ...
Baki Hazer, Hülya Macit
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Improved Adhesion Between PMMA and Stainless Steel Modified with PMMA Brushes
ACS Applied Materials & Interfaces, 2014In this work, various lengths and densities of poly(methyl methacrylate) (PMMA) brushes were synthesized on stainless steel (SS) surfaces via surface initiated atom transfer radical polymerization. Subsequently, the joints between the bulk PMMA and the PMMA brushed stainless steel were obtained by injection molding, and for these the degree of adhesion
Shimizu, Kyoko +5 more
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Solvent-based bonding of PMMA–PMMA for microfluidic applications
Microsystem Technologies, 2018Solvent bonding is a simple, inexpensive and quick technique used for joining microfluidic parts made of thermoplastic polymers that results in high bonding strength and good optical clarity. However, selecting the right solvent as well as the curing conditions is an important step in providing a successful bond that ensures an appropriate bonding ...
Mohammad M. Faghih, M. Keith Sharp
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Transactions on Electrical and Electronic Materials, 2019
In this paper, the effect of (Al2O3, ZrO2, Ag, Al2O3-Ag, ZrO2-Ag) nanoparticles on the optimized geometrical parameters and electronic properties of poly-methylmethacrylate has been investigated for first time. The optimization parameters included both bonds angles and bonds length.
Angham Hazim +2 more
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In this paper, the effect of (Al2O3, ZrO2, Ag, Al2O3-Ag, ZrO2-Ag) nanoparticles on the optimized geometrical parameters and electronic properties of poly-methylmethacrylate has been investigated for first time. The optimization parameters included both bonds angles and bonds length.
Angham Hazim +2 more
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MRS Proceedings, 2006
AbstractWe have utilized the fact that syndiotactic and isotactic Poly(methyl methacrylate) {PMMA} form a stereocomplex to spin semi-crystalline PMMA fibers. Our goal is to produce oriented semi-crystalline fibers with a high enough melting point to withstand atactic-PMMA processing conditions. We successfully developed stereocomplex PMMA fibers by wet
Matija Crne +4 more
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AbstractWe have utilized the fact that syndiotactic and isotactic Poly(methyl methacrylate) {PMMA} form a stereocomplex to spin semi-crystalline PMMA fibers. Our goal is to produce oriented semi-crystalline fibers with a high enough melting point to withstand atactic-PMMA processing conditions. We successfully developed stereocomplex PMMA fibers by wet
Matija Crne +4 more
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Macromolecules, 1997
Polymer composites of several concentrations of poly(methyl methacrylate) and poly(p-phenyleneterephthalamide) microfibrils have been prepared by blending a solution of the matrix polymer and a suspension of microfibrils obtained from a solution of commercial Kevlar fiber in H2SO4. Scanning electron microscopy shows that a continuous network of fibrils
M. Monleón Pradas +3 more
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Polymer composites of several concentrations of poly(methyl methacrylate) and poly(p-phenyleneterephthalamide) microfibrils have been prepared by blending a solution of the matrix polymer and a suspension of microfibrils obtained from a solution of commercial Kevlar fiber in H2SO4. Scanning electron microscopy shows that a continuous network of fibrils
M. Monleón Pradas +3 more
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Solar Energy Materials and Solar Cells, 1994
Abstract Metallized, flexible polymeric reflector materials are much lighter and potentially less expensive than the conventional glass/metal mirrors often used in solar thermal concentrators such as heliostats and parabolic dishes and troughs. Unweathered silvered-PMMA reflectors have a solar reflectance at least as high as glass reflectors, but ...
Paul Schissel +3 more
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Abstract Metallized, flexible polymeric reflector materials are much lighter and potentially less expensive than the conventional glass/metal mirrors often used in solar thermal concentrators such as heliostats and parabolic dishes and troughs. Unweathered silvered-PMMA reflectors have a solar reflectance at least as high as glass reflectors, but ...
Paul Schissel +3 more
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Crosslinking of PMMA Elastomer Block Copolymers Through PMMA Stereocomplexes
1992It is known for some time that in suitable solvents, mixtures of syndiotactic and isotactic PMMA form stereocomplexes.1 The parameters that govern stereocom-plex formation have been extensively studied by Challa, 2 Spevacek3 and others and were recently reviewed by Spevacek.4 Stereocomplex formation is believed to involve the formation of a type of ...
T. E. Hogen-Esch +4 more
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Experimental Mechanics, 2000
The authors performed deep punching experiments on PMMA (polymethyl methacrylate) using cylindrical-shaped punches with conical and hemispherical noses. The test samples cracked when no lateral confinement was provided. Application of proper lateral confinement suppressed the cracks. The punching force recorded from the experiments correlates very well
S. Satapathy, S. Bless
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The authors performed deep punching experiments on PMMA (polymethyl methacrylate) using cylindrical-shaped punches with conical and hemispherical noses. The test samples cracked when no lateral confinement was provided. Application of proper lateral confinement suppressed the cracks. The punching force recorded from the experiments correlates very well
S. Satapathy, S. Bless
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Die Makromolekulare Chemie, 1981
AbstractSeveral cosolvent mixtures for PMMA are reported. Their cosolvency has been confirmed by studying phase separation temperatures as a function of solvent composition. The results show that they are very powerful cosolvents. Acetonitrile forms such cosolvent mixtures with compounds containing different chemical groups (ester, ketone, alcohol ...
Inés Fernández‐Piérola +1 more
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AbstractSeveral cosolvent mixtures for PMMA are reported. Their cosolvency has been confirmed by studying phase separation temperatures as a function of solvent composition. The results show that they are very powerful cosolvents. Acetonitrile forms such cosolvent mixtures with compounds containing different chemical groups (ester, ketone, alcohol ...
Inés Fernández‐Piérola +1 more
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