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Showing 1 to 20 of 21 for “"polyphenylene"”.
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Hochverzweigte Polyphenylene als Matrixmaterial für nanoporöse Isolatorsysteme mit niedriger Dielektrizitätskonstante
… Synthese und Charakterisierung hochverzweigter Polyphenylene über die Diels-Alder-Reaktion von phenylierten Cyclopentadienonen mit phenylierten Alkinen zur Verwendung als Matrixmaterialien in nanoporösen Isolatorsystemen. Dabei wurde sowohl von A2- und B3-Monomeren als auch von AB2- und …
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Spectroscopic exploration of conformal heterogeneity in an amorphous polyphenylene-vinylene derivative
Photoluminescence and Resonant Raman spectroscopy were performed on the conjugated polymer MDMO-PPV (Poly[2-methoxy-5-(3\u2032,7\u2032-dimethyloctyloxy)-1,4-phenylenevinylene]), both in its pure form and in blends with electron acceptors, in order to understand how conformations are affected by …
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Synthesis of Highly Ordered Polymer Nanostructures Based on Polyphenylene Vinylenes (PPVs)
Poly(phenylene vinylene)s (PPVs) are a prototypical class of CPs that has been well studied in terms of optical, electronic, and structural properties. To build off of this knowledge, a series of well-defined polychromophores with a backbone composed of alternating PPV oligomers (trimer, pentamer, …
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Development and gas permeation study of flat asymmetric polyphenylene oxide membranes.
… gas separation membranes were prepared from polyphenylene oxide (PPO) and modified PPO and tested for CO$\sb2$/CH$\sb4$ separation. Using a fractional factorial design, a study of membrane casting conditions was completed in order to optimize the flux and the selectivity of the membrane. A …
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An experimental investigation of the material response of graphite/polyphenylene sulfide
The material response of a graphite/polyphenylene sulfide (thermoplastic) composite system to a variety of loadings was experimentally investigated. Quasi-static tension tests were performed on specimens cut from unidirectional panels at angles of 0°, 90°, and 10° in order to the find material …
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Nondestructive inspection of load induced damage in fiber reinforced polyphenylene sulfide
… the results of an investigation of properties of polyphenylene sulfide (PPS) reinforced with random, continuous glass fibers, approximately 30% by weight. The investigation included both characterization of the mechanical properties and nondestructive inspection of the material. The objectives of …
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Elevated-Temperature Oxidative Curing, Friction and Wear of Polyphenylene Sulfide (PPS) and its Composites
… Compared with other polymers in this category, Polyphenylene Sulfide (PPS) shows an impressive set of characteristics such as superior resistance to solvents, good mechanical properties, versatile processing, and lower price. However, the lack of understanding of its complex processing, which …
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Characterization of the molecular structure at modified polymer surfaces and polyphenylene sulfide/copper interphases
… unmodified thin films. The optical constants of polyphenylene sulfide (PPS) were determined and exact optical theory was utilized to simulate spectra for a variety of reflectance techniques. This method was also utilized to confirm the ordered state of thin spin coated PPS films. The surface …
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Development of and gas permeation study of homo and copolymers from the family of polyphenylene oxides
… of new copolymers from the family of polyphenylene oxides. This family of polymers was chosen because of the properties of its best-known representative, poly(2,6-dimethyl-1,4-phenylene oxide), which shows one of the highest rates of permeability for gases among glassy polymers, …
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An Investigation of the Tensile Strength and Stiffness of Unidirectional Polymer-Matrix, Carbon-Fiber Composites under the Influence of Elevated Temperatures
… results. The different matrix materials were polyphenylene Sulfide (PPS), vinyl ester with two different fiber-matrix interface materials, and polyether ether ketone (PEEK).
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Corrosion and corrosion suppression on n-type gallium arsenide semiconductor liquid-junction solar cells
… layers on the electrode surface. The polyphenylene oxide coating partially suppressed corrosion in acid electrolytes. However, the coatings did not improve hole transfer efficiency in neutral electrolytes.
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Synthesis of Highly Fluorinated Diels-Alder Polyphenylenes
… analogues. Meanwhile, Diels-Alder polyphenylenes (DAPPs) are known for thermal stability as well as their rigid structure and glassy physical characteristics, which have led to a variety of film and membrane applications. This dissertation merges these two fields by demonstrating a …
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Processing Behavior of Thermoplastics Reinforced with Melt Processable Glasses
… Thermoplastic resins consisting of polyphenylene sulfide (PPS), polyetherimide (PEI) and polyetheretherketone (PEEK) were combined with phosphate glasses having glass transition temperatures (Tg) that ranged from 230-290°C to form composite systems where both the matrix and …
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Development of polymer bonded magnets with enhanced magneto-mechanical properties for high temperature and aggressive environments
… corrosion resistance and magnetic properties of polyphenylene sulfide (PPS) bonded Nd-Fe-B magnets can be enhanced by treating the Nd-Fe-B powders with a suitable silane coupling agent prior to blending with the polymer and subsequent molding of the composite. The coated rare earth powders are …
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The design and synthesis of linear and macrocyclic Poly(para-arylene)s
… three-dimensional triptycene scaffold along the polyphenylene backbone. Recent interest in belt-shaped p-polyarylene macrocycles, otherwise known as nanohoops, has been high due to their potential as a starting template for the bottom-up synthesis of armchair carbon nanotubes (CNTs). The proposed …
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Towards Advancement of Continuous Fiber Composite Additive Manufacturing
… tow of continuous carbon fibers (CCF) within a polyphenylene sulfide (PPS) matrix. Filaments of CCF/PPS with fiber volume fractions between 30 and 50% nominal fiber volume fraction were printed, and results were compared with those achieved with commercially available composite material systems. …
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Generation of Thermotropic Liquid Crystalline Polymer (TLCP)-Thermoplastic Composite Filaments and Their Processing in Fused Filament Fabrication (FFF)
… (ABS) and a high performance thermoplastic, polyphenylene sulfide (PPS). The TLCPs are composed of rod-like monomers which are highly aligned under extensional kinematics imparting excellent one-dimensional tensile properties. The tensile strength and modulus of the 40 wt.% TLCP/ABS filaments …
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The Development of Compression Moldable Polymer Composite Bipolar Plates for Fuel Cells
… and uses polyethylene terepthalate (PET) or polyphenylene sulfide (PPS) as the binder, although PPS is mainly used. In order to reach sufficient conductivity for use in generating bipolar plates, the polymer is doped with high levels of conductive graphite particles in the range of 70-80 wt%. …
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Synthesis and Characterization of Novel Pol(arylene ethers) for Gas Separation and Water Desalination Membranes
… to cater to specific needs. For example, the polyphenylene oxides have been brominated to increase the permeability for gas separation applications. Blending is another viable method to impart desirable properties to polymers. Bisphenol A based poly(arylene ether ketone) (BPAPAEK) has been …
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