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Showing 1 to 14 of 14 for “"Polystyrenes"”.
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Synthesis of side-chain polystyrenes for all organic solution processed OLEDs
In the present work side-chain polystyrenes were synthesized and characterized, in order to be applied in multilayer OLEDs fabricated by solution process techniques. Manufacture of optoelectronic devices by solution process techniques is meant to decrease significantly fabrication cost and allow …
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The thermal degradation of polystyrene.
… presence of weak links in thermally-initiated polystyrenes cannot be accounted for in terms of peroxidic links incorporated into the polymer chains. However such links do reduce the thermal stability of the polymer. The degradation pattern of polystyrenes containing initiator fragments at the …
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Dielectric properties of polymers at microwave frequencies
… sulfone) and a series of well defined polystyrenes with varying end groups and end group concentrations. The Hewlett-Packard network analyzer has been used to measure both the real and imaginary parts of the dielectric in the frequency range of 1-18 GHz. Both coaxial airline and …
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Self-Assembly, Spatial-, and Size- Control of Gold Nanoparticle/Block Copolymer Conjugates
… S4VP polymers were exposed. Pyridylterminated polystyrenes were employed as monodentate ligands for AuNP, while longer blocks of 4VP were used as multidentate ligands. The control of selectivity and distribution of metal nanoparticles within the S4VP block copolymer domains were probed by two …
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The effect of heat compression on mechanical behaviour and moisture content of pineapple leaf fibre and sugarcane bagasse waste for plate disposal
… and sugarcane bagasse as compounds in replacing polystyrenes and others plastics glass in the manufacture of plate disposal. This platter is made from pineapple leaf and sugarcane bagasse by six (6) series of mixtures with different percentages namely series 1 (20% of pineapple leaf), series 2 …
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Ft-Ir Study of the Dynamics of Entangled Polymer Melts
… different monodisperse molecular weight atactic polystyrenes were used, and the FTIR measured the normalized Hermans orientation function, F(t), as a function of relaxation time, t, and molecular weight, M. We observed that F(t) = 1 $-$ $\alpha$t$\sp{1/2}$M$\sp{-3/2}$, for t $$ P, and became …
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Comparison of Silica Polyamine Composites and Crosslinked Polystyrene Resins
… Explorations into developing direct analogs of polystyrenes chelator resins led to a new reaction pathway for a currently commercially produced SPC that is simpler and more cost effective. A study aimed at understanding the nature of the polymer-surface interface in SPCs was undertaken. This …
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Comparison of Silica Polyamine Composites and Crosslinked Polystyrene Resins
… Explorations into developing direct analogs of polystyrenes chelator resins led to a new reaction pathway for a currently commercially produced SPC that is simpler and more cost effective. A study aimed at understanding the nature of the polymer-surface interface in SPCs was undertaken. This …
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Synthesis and Characterization of Multi-Component Polymeric Materials Prepared via Free Radical Polymerization
High molecular weight star-shaped polystyrenes were prepared via the coupling of 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) terminated polystyrene oligomers with divinylbenzene (DVB) in m-xylene at 138 °C. Linear polystyrene oligomers (Mn = 19,300 g/mol, Mw/Mn = 1.10) were synthesized in bulk …
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A study of the crystallization kinetics of isotactic polystyrene
… distribution and the molecular weight range of polystyrenes investigated. Also, growth rate measurements were extended to higher temperatures and a more appropriate kinetic equation for crystal growth rate analysis was applied. The majority of published studies that have used the …
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Non-Covalent Interactions in Block Copolymers Synthesized via Living Polymerization Techniques
… Hydrogen bonding uracil end-functionalized polystyrenes and poly(alkyl acrylate)s were synthesized via nitroxide mediated polymerization from novel uracil-functionalized alkoxyamine unimolecular initiators. Terminal functionalization of poly(alkyl acrylate)s with hydrogen bonding groups …
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New Applications of Fluorescence Correlation Spectroscopy in Materials Science
… For this purpose we have synthesised a set of polystyrenes with molecular weights ranging from 4 to 1550 kg/mol each chain being labelled with a single dye molecule. All species were anionically polymerised in order to grant a very low polydispersity and with this a high reliability in the …
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Synthesis and Self-Assembly of Novel ABC Miktoarm Star Terpolymers
… were afterwards conjugated with azido-functional polystyrenes (PS), poly(ethylene oxide) (PEO), PtBMA and PDMAEMA to successfully obtain different novel ABC miktoarm star terpolymers with narrow molecular weight distributions. For an ABC miktoarm star terpolymer consisting of arms of PB, PtBMA and …