Materials Literature
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In search of a better understanding of catalyst effects on final product qualities of polypropylene, an attempt was made to establish a correlation between catalyst type, polymer chain structure of homopolymers, crystallization behavior, as well as final morphology and mechanical properties. Conventional Ziegler–Natta…
Polymeric granules were prepared by matrix encapsulation containing 20, 35 and 50% (w/w) of natural liquid pesticide viz., Azadirachta Indica A. Juss. (neem) seed oil (NSO) per dry weight of urea formaldehyde crosslinked starch (UF-St), guar gum (UF-GG) and UF-(St + GG) matrices. Results of swelling and cumulative rel…
Wood could provide better service in some applications if it were harder and more dimensionally stable. In this study, wood–polymer composites (WPC) made with different chemical combinations were evaluated for dimensional stability, ability to exclude water vapor and liquid water, and hardness. Pine, maple, and oak so…
Residual softwood was thermomechanically pretreated and used to produce composites with no synthetic binders. The lignocellulosic material was steam exploded with a thermomechanical aqueous vapor process in a continuous tubular reactor. The study attempts to use the intrinsic bonding capacity of the steamed fiber, whi…
This paper describes the process optimization in injection molding of high-density polyethylene (HDPE). Both conventional injection molding and shear controlled orientation (SCORIM) were employed in processing. The process optimization was based on design of experiments and complemented with analysis of variance. Mech…
Maximum entropy method (MEM) charge density analysis has been carried out on synchrotron X-ray powder diffraction data of a series of anhydrous sodalites, M 6 (AlSiO 4 ) 6, M = Na, Ag, Tl. Analysis of the MEM electron densities reveals the nature of the interactions in the structures. The sodium atoms are bonded to th…
The adsolubilization of 2-naphthol by tetradecyltrimethylammonium bromide (TTAB) and by mixtures of TTAB and hydrophobically modified polyacrylamide (HMPAM) on Na-kaolinite was investigated. At concentrations of TTAB in the region of the CMC, only small differences were found in the amounts of 2-naphthol adsolubilized…
We have designed, synthesized and characterized eight cavitand-based de novo four-helix bundles, where each helix contains the basis sequence EELLKKLEELLKKG. We find that each de novo protein is highly helical and extremely stable to the chemical denaturant guanidine hydrochloride (GuHCl). We studied the effect of the…
Previously a rough correlation between the logarithm of the most probable secondary β-relaxation time at the glass temperature T g, log[ τ β ( T g )], and the Kohlrausch−Williams−Watts (KWW) exponent, (1 − n ), of the primary α - relaxation correlation function exp[−( t / τ α ) 1- n ] was found when examining a whole…
The synthesis and in situ photopolymerization of reactive liquid crystals for the preparation of materials with different degrees of cross-linking is described. The molecular orientation of polymeric films can be controlled by orienting the monomeric photopolymerizable materials in the mesomorphic state. The birefring…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTElectrochemical and Chemical Oxidation of Gold(I) Thiolate Phosphine Complexes: Formation of Gold Clusters and DisulfideJinhua Chen, Tong Jiang, Gang Wei, Ahmed A. Mohamed, Craig Homrighausen, Jeanette A. Krause Bauer, Alice E. Bruce, and Mitchell R. M. BruceView Autho…
The lattice disordering transition (LDT) and the domain dissolution transition (DDT) of a highly asymmetric polystyrene- block -poly(ethylene- co -but-1-ene)- block -polystyrene (SEBS-8) triblock copolymer with a volume fraction of polystyrene (PS) block of 0.084 have been investigated by small-angle X-ray scattering…
The synthesis of diarylethyne-linked multiporphyrin arrays requires Pd-mediated coupling conditions that are performed in dilute solution in the absence of copper and that give reaction mixtures that are easily purified. We previously developed copper-free Pd-mediated coupling conditions (Pd 2 (dba) 3 and AsPh 3 in to…
Surface interaction controlled microphase separation leading to the formation of chemically heterogeneous surface nanopatterns in dry ultrathin films of A−B diblock copolymers is studied experimentally and theoretically in the strong segregation limit. On a planar surface one of the blocks (A block) is strongly adsorb…
An antibody−metalloporphyrin assembly that catalyzes the enantioselective oxidation of aromatic sulfides to sulfoxides is presented. Antibody SN37.4 was elicited against a water-soluble tin(IV) porphyrin containing an axial α-naphthoxy ligand. The catalytic assembly comprising antibody SN37.4 and a ruthenium(II) porph…
We studied by neutron reflection the architecture of poly(methyl methacrylate) (PMMA) layers adsorbed on hydroxylated quartz from the melt. The samples were prepared by spin-coating about 1 μ m thick films of PMMA onto quartz plates, annealing at melt conditions for an extended period, and then leaching away unbound m…
In acetonitrile electropolymerization of pyrrole is considerably facilitated by the addition of a small amount of water. Several mechanisms have been suggested in the past to interpret this dramatic influence of water. However, none of them has explained all the experimental results obtained up to now. On the basis of…
The compounds [N(CH(3))(4)][Cu(N(3))(3)] (1) and [N(CH(3))(4)][Mn(N(3))(3)] (2) have been synthesized and characterized. Compound 1 crystallizes in the monoclinic P2(1)/n space group, with Z = 4, a = 7.473(2) Å, b = 15.780(2) Å, c = 9.321(2) Å, and beta = 92.59(2) degrees. Compound 2 crystallizes in the monoclinic P2(…
We have recently shown that nanocomposites of colloidal particles in a fatty lipid matrix can be grown via a diffusion process controlled by selective electrostatic interactions. In this paper, a detailed investigation of the diffusion of carboxylic acid derivatized gold colloidal particles of different sizes into the…
The theory of magnetic symmetry in quasicrystals is used to characterize the nature of magnetic peaks, expected in elastic neutron diffraction experiments. It is established that there is no symmetry-based argument which forbids the existence of quasiperiodic long-range magnetic order. Suggestions are offered as to wh…