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The prospect of this study was to eliminate inter- and intramolecular crosslinks and to synthesize water-soluble phoshorylated chitosan through the phosphorus pentoxide/methanesulphonic acid system. The influences of ethanol washing and sodium salt formation on the elimination of inter- and intramolecular crosslinks were investigated. It was found that the obtained sodium phosphorylated chitosan was water soluble independent of the degree of phosphoric substitution.
Glycopolymer-substituted gold substrates were prepared by means of living radical polymerization with a reversible addition-fragment chain transfer (RAFT) reagent. Thiol-terminated glycopolymers were bound to the gold substrate to yield the polymer-substituted interface. In the case of the gold substrate, the interactions with proteins (lectins and Shiga toxins) were analyzed by surface plasmon resonance (SPR). The interactions were highly specific and the signal-to-noise ratio of protein recognition was more than 16.
The static partial scattering functions for linear and ring random copolymers of type A–B are investigated. In the case of random distribution of monomers, analytic forms can be derived. Monte Carlo simulations are used to make evaluations on biased distributions of monomers. Results show that the number, fraction and distribution of monomers have a significant effect on intensities at sufficiently large scattering angles. The scattering function in molten state is also calculated by random phase approximation.
Fluoroalkyl end-capped N-(1,1-dimethyl-3-oxobutyl)acrylamide oligomer [RF-(DOBAA)n-RF] in silica nanocomposite can exhibit a nonflammability characteristic even after calcination at 800 °C, through the formation of ammonium hexafluor osilicate corresponding to −154.8 p.p.m. signal in 19 F MAS NMR spectra during the nanocomposite reactions; in contrast, no formation of ammonium hexafluorosilicate during the composite reaction affords a usually flammable behavior for RF-(DOBAA)n-RF oligomer in silica nanocomposite.
Transparent organic–inorganic nanocomposites were successfully synthesized from poly(arylene ether ketone)-based matrix polymer and BaTiO3 nanoparticles. The dispersibility of nanoparticles was significantly improved by both the introduction of phosphonic acid moiety into the polymer chain and the organic modification of the nanoparticle surface. Refractive index of the obtained transparent nanocomposite, which contains 44 wt% of BaTiO3, increased to 1.72 @ 589 nm.
10,12,14,16,18,20-Triacontahexayne-1,30-diol and its diphenylurethane and diphenylester were synthesized, and their solid-state polymerization behaviors were investigated. The regular two-step solid-state polymerization was confirmed for the diphenylurethane derivative.
Sulfur-containing acrylic monomers were developed for high refractive index. The index of polymer films increased with the number of sulfur atoms in the monomer structure. Trisulfur-acrylic polymer provided refractive indices of more than 1.72 at visible light. Dipolar phenyl structure significantly increased the refractive index of acrylic polymers. Wavelength dispersion of the refractive index was investigated with Abbe's number of ca. 30 for all polymer films, except for the dipolar polymer viewing Abbe's number of ∼41.
