Results 241 to 250 of about 7,432 (275)

Model polystyrene networks

Faraday Discussions of the Chemical Society, 1974
Abstract Model polystyrene networks have been prepared, at different concentrations in an inert solvent, in such a way that the number of crosslinks is accurately known, and the topology of the network can be varied in a controlled way. The contribution of various network defects to the modulus of the network has been examined.
G. Allen, P. A. Holmes, D. J. Walsh
openaire   +1 more source

Immiscibility in polystyrene/sulfonated polystyrene blends

Polymer, 1995
Abstract Miscibility in the binary system of deuterated polystyrene and lightly sulfonated polystyrene has been investigated. Small-angle neutron scattering was used to evaluate the physical state of deuterated polystyrene/polystyrene—1.67% sulfonic acid blends over a wide composition range.
N.C.Beck Tan, X. Liu, R.M. Briber, D.G. Peiffer   +3 more
openaire   +1 more source

Lipase Polystyrene Giant Amphiphiles

Journal of the American Chemical Society, 2002
A new type of giant amphiphilic molecule has been synthesized by covalently connecting a lipase enzyme headgroup to a maleimide-functionalized polystyrene tail (40 repeat units). The resulting biohybrid forms catalytic micellar rods in water.
Velonia, Kelly, Rowan, Alan E., Nolte, Roeland J. M.   +2 more
openaire   +5 more sources

Luminescent Diazaborolyl-Functionalized Polystyrene

ACS Macro Letters, 2012
We present two different procedures for the synthesis of poly[4-(1',3'-diethyl-1',3',2'-benzodiazaborolyl)styrene] (3a) and poly[4-(1',3'-diphenyl-1',3',2'-benzodiazaborolyl)styrene] (3b). The new polymers were fully characterized by GPC, multinuclear NMR, and elemental analysis. The thermal properties and stability were studied by DSC and TGA, and the
Kuhtz, Henry, Cheng, Fei, Schwedler, Stefanie, Böhling, Lena, Brockhinke, Andreas, Weber, Lothar, Parab, Kshitij, Jäkle, Frieder   +7 more
openaire   +3 more sources

Polystyrene modifications. II. Ring‐substituted polystyrenes

Journal of Applied Polymer Science, 1963
AbstractRing‐substituted styrenes were prepared and polymerized. They usually had higher glass transition temperatures than polystyrene. In some disubstituted systems the Tg was an additive function of the individual groups. Crystallinities of methyl‐substituted polymers varied, depending upon the ring positions involved.
K. R. Dunham, J. W. H. Faber, J. Vandenberghe, W. F. Fowler   +3 more
openaire   +1 more source

‘Weak links’ in polystyrene

Polymer Degradation and Stability, 1981
Abstract A first step in the thermal degradation of polystyrene prepared by radical polymerisation has been isolated by heating the polymer in the temperature range 199–280°C. In this step a chain scission process occurs without formation of volatile products, involving, on average, about one bond between structural units in every 10 000.
CHIANTORE, Oscar, CAMINO, Giovanni, COSTA, Luigi, N. Grassie   +3 more
openaire   +3 more sources

Dielectric properties of polystyrene and polystyrene-chloranil

Thin Solid Films, 1980
Abstract Dielectric permittivities and losses were measured above room temperature in the frequency range 102–105 Hz for undoped and chloranil- (Chl-) doped polystyrene (PS) films (thickness about 15 μm) with progressively increasing Chl concentrations.
Y.K. Kulshrestha, A.P. Srivastava
openaire   +1 more source

Diffusion of linear polystyrene into crosslinked polystyrene

Polymer, 1997
Abstract The diffusion of linear polystyrene (PS) into its crosslinked counterpart was studied using both neutron reflectivity (NR) and forward recoil scattering (FRES). The penetrant molecular weights were monodisperse and ranged from 10 000 to 690 000 g mol −1 . The molecular weight between crosslinks was kept at 22 000 g mol −1 .
Wen-li Wu, William E. Wallace, John H. van Zanten, Barry J. Bauer, Da-wei Liu, Apollo Wong   +5 more
openaire   +1 more source

Biocidal polystyrene beads. IV. Functionalized methylated polystyrene

Journal of Applied Polymer Science, 2004
AbstractCrosslinked chloromethylated polystyrene beads were reacted with hydantoin and imidazolidinone derivatives to produce functionalized beads which could be rendered biocidal upon reaction with free chlorine or bromine. The biocidal efficacies of the N‐chlorinated, and in one case, the N‐brominated polymeric beads against Staphylococcus aureus and
Y. Chen, S. D. Worley, T. S. Huang, J. Weese, J. Kim, C‐I. Wei, J. F. Williams   +6 more
openaire   +1 more source

Photodegradation of polystyrene and polystyrene containing benzophenone

Polymer Photochemistry, 1983
Abstract The photodegradation of polystyrene has been studied by electron spin resonance, infra-red absorption, viscosity and gel fraction measurements. Irradiations with light from a medium pressure mercury lamp to polystyrene film at 45°C in vacuum, gave rise to the polystyryl radical.
Ayako Torikai, Tetsuya Takeuchi, Kenji Fueki   +2 more
openaire   +1 more source