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Poly(trimethylene terephthalate)/polybutadiene grafted polymetyl methacrylate (PB-g-PMMA, MB) blends were prepared by melt processing with varying weight ratios (0–5wt%) of diglycidyl ether of bisphenol-A (DGEBA) epoxy resin as a reactive compatibilizer. DMA result showed PTT was partially miscible with MB particles in the presence of the compatibilizer. Fourier transform infrared (FTIR) and rheological...
Fluorinated sulfo-pendants poly(arylenethioethersulfone) copolymer, which contained 50mol% sulfonate content per repeat unit (6F-SPTES-50), were synthesized by a nucleophilic polycondensation from 4,4-(hexafluoroisopropylidene)-diphenylthiol, 3,3′-disulfonate-4,4′-difluorodiphenylsulfone and 4,4′-difluorodiphenylsulfone. The 6F-SPTES-50 copolymer possessed high molecular weight, exhibited good film...
The ring-opening metathesis polymerization (ROMP) of norbornene derivatives 1–5 bearing oligomeric siloxane pendant groups was carried out with Grubbs 1st and 2nd generation, and Grubbs–Hoveyda ruthenium (Ru) catalysts. Monomer 1 gave high-molecular-weight polymers (M n ca. 27 000–180 000) in high yields (80–100%). Monomers 2–5 also polymerized with Ru carbene catalysts to give high-molecular-weight...
Polythiophene containing amphiphilic decyl-tri(oxyethylene) side group was synthesized. Gold nanowire networks having almost uniform wire diameters could be prepared when the amphiphilic polythiophene was mixed with hydrogen tetrachloroaurate (HAuCl 4 ) in THF followed by the addition of aqueous sodium borohydride solution. The size of nanowire networks and the diameter of the component wires...
A series of polybenzimidazoles (PBIs) were prepared from 3,3′-diaminobenzidine (DAB) and substituted aromatic dicarboxylic acids. Effects of added polarity, bulk and isomerism in the dicarboxylic acid moiety on the properties of formed aromatic polybenzimidazoles were investigated. Solution polycondensation procedure was optimized for individual case of PBI synthesis in order to obtain inherent viscosity...
The crystallinity of poly(butylene terephthalate) (PBT) films was investigated by comparing measurements of fluorescence and density. It was found that the ratio of the fluorescence intensity at 320nm to that at 365nm can be an effective indicator of crystallinity. The dynamic process of cold crystallization was directly observed for PBT films prepared using a spin-casting method on quartz disks by...
In this study, the preparation of organoclays via a new process using supercritical carbon dioxide is described. This method turns out to be very efficient with various surfactants, in particular nonwater-soluble alkylphosphonium salts. The influence of the surfactant as well as of the clay nature on the thermal stability of the organoclay is evaluated by thermogravimetric analysis. Phosphonium-based...
The present paper reports on the syntheses and association behavior of two random copolymers of sodium N-acryloyl-l-valinate and N-dodecylacrylamide in buffered (pH 8.0) aqueous solution containing 0.1M NaCl. Surface tension and viscosity results showed pronounced amphiphilic nature of the copolymers in aqueous solution at pH 8.0. Steady-state fluorescence studies using pyrene and N-phenyl-1-naphthylamine...
Cationic polymers have been studied as promising nonviral gene delivery vectors. In contrast to the conventional polycations with long sequences of covalently bonded repeating units, this work reports a supramolecular gene carrier where many cationic cyclic units are threaded over a polymer chain to form a chain-interlock structured gene carrier. A series of novel supramolecular cationic polyrotaxanes...
A series of copolymers with various compositions were prepared by the ring opening copolymerization of l-lactide (l-LA) and ɛ-caprolactone (ɛ-CL) using nontoxic magnesium octoate as a catalyst in bulk. The copolymerization process and the influence of transesterification on the chain microstructure were examined by 1 H and 13 C NMR. A tapered block or gradient copolymer is expected...
Ultrafine 1,6-diisocyanatohexane-extended poly(1,4-butylene succinate) (PBSu-DCH) fibers were best fabricated by electrospinning from 22% w/v PBSu-DCH solution in 90:10 v/v dichloromethane/trifluoroacetic acid under the electric field of 17kV/20cm. The diameters of these fibers were 172±3nm. Due to their fibrous nature, the obtained PBSu-DCH fiber mats exhibited high values of advancing/receding water...
A novel styrene–butadiene–styrene tri-block copolymer (SBS) and poly(ɛ-caprolactone) (PCL) blend were introduced for its shape memory properties. Compared to the reported shape memory polymers (SMPs), this novel elastomer and switch polymer blend not only simplified the fabrication process but also offer a controllable approach for the study of mechanisms and the optimization of shape memory performances...
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