Materials Literature
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Abstract New aromatic bismaleimides (BMIs), bis(4‐maleimidophenoxy‐3,5‐dimethylphenyl)dicyclopentadiene (DCPDBMI) and bis(4‐maleimido‐phenoxy‐3,5‐dimethylphenyl)dipentene (DPBMI), containing a large dicyclopentadiene (DCPD) or dipentene (DP) and aryl ether linkage, were synthesized from diamine bis(4‐aminophenoxy‐3,5‐…
Abstract A new form of polymer blend, macroporous chitosan/poly(vinyl alcohol) (PVA) foams made by a starch expansion process, exhibits the functionalities of chitosan while avoiding its poor mechanical properties and chemical instabilities. The appropriate conditions for foaming are discussed using both insoluble and…
Computer simulations show that end-grafted immiscible homopolymers can confer multivalence to nanoparticles, resulting in soft nanopolyhedra with structures identical to those found in small clusters of colloidal microspheres. Unprecedented structure tunability is demonstrated by several structure transition sequences…
We investigate, using molecular dynamics, the effect on the radial breathing mode (RBM) frequency of immersion in water for a range of single-walled carbon nanotubes. We find that nanotube-water interactions are responsible for an upshift in the RBM frequency of the order of 4-10 wave numbers. The upshift is comprised…
Abstract A polyurethane (PU)/clay nanocomposite was synthesized from polyol, polymeric 4,4′‐diphenyl methane diisocyanate (PMDI), and modified clay with PMDI. To achieve the modified clay with PMDI, the silanol group of the clay and the NCO group of the PMDI were reacted for 24 h at 50°C to form urethane linkage. Four…
We have realized silicon-on-insulator photonic crystal (PhC) waveguides with intense 1.54μm emission at room temperature. The slabs contain a thin layer of SiO2 with Er3+ doped silicon nanoclusters embedded at the center of the Si core and are patterned with a triangular lattice of holes. An enhancement by more than t…
Abstract Heterophasic copolymers comprised of polypropylene (PP) matrix and ethylene–propylene copolymer (EPC) dispersed phase were investigated with respect to the dispersed phase composition, i.e., ethylene/propylene ratio. The rheological properties, morphology, as well as thermal and mechanical relaxation behavior…
One of the main obstacles in the development of high-performance piezoelectric materials for advanced devices is reaching sufficient levels of electrical poling by application of electric fields. To overcome this obstacle, we suggest an electromechanical poling method, which makes use of the ferroelastic properties of…
Nephrogenic systemic fibrosis (NSF) is a recently characterized systemic fibrosing disorder developing in the setting of renal insufficiency. NSF's rapidly progressive nature resulting in disability within weeks of onset makes early diagnosis important. Two reports of NSF after liver transplantation are known of. We p…
Abstract A copolymer hydrogel was made by mixing acrylamide and 2‐hydroxyethyl methacrylate monomers in water and polymerizing with gamma irradiation. The progress of polymerization and the vibrational structure of the hydrogel were examined using Raman spectroscopy. Raman spectra indicated that the copolymer has a mo…
Abstract Useful coating products may be obtained by chemical valorization (glycolysis) of post‐consumed poly(ethylene terephthalate) (PET) wastes. Glycolysis of PET waste was carried out using poly(ethylene glycol) (PEG) of various molecular weights (200, 400, 600). The depolymerized oligoesters obtained were transest…
Abstract Summary: A novel series of aromatic poly(ether imide)s (PEIs) IVa–h containing ortho ‐linked aromatic units and pendent trifluoromethyl (CF 3 ) groups were prepared from 2,3‐bis(3,4‐dicarboxyphenoxy)naphthalene dianhydride ( I ) with various CF 3 ‐substituted aromatic bis(ether amine)s IIa–h via a conventiona…
In situ Raman spectroscopic measurements with a useful peak deconvolution technique were attempted in this paper to quantitatively investigate the structural changes of silica glass as a function of temperature in the range from room temperature to $1300\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{}\ma…
Abstract Epoxidized natural rubbers (ENR) with various levels of epoxide groups were prepared. Thermoplastic vulcanizates based on 75/25 ENRs/PP blends with Ph‐PP compatibilizer were later prepared by dynamic vulcanization using sulfur curing system. Influence of various levels of epoxide groups on rheological, mechan…
Abstract Summary: The synthesis of azoalkanes such as azocyclohexane ( 1 ) and 4,4′‐bis(cyclohexylazocyclohexyl)methane ( 2 ) and their use as flame retardants in polymeric substrates is reported. For the first time it is demonstrated that azoalkanes alone can effectively provide flame retardancy and self‐extinguishin…
Rutile-type Co-doped SnO(2) nano-crystal powders are prepared by the wet chemical method. The magnetic moment is found to decrease with increasing Co content. There is hysteresis between field cooled (FC) and zero field cooled (ZFC) magnetization when the temperature is below 70 K. These magnetic behaviours represent…
Abstract Blends of poly(3‐hydroxy butyrate‐ co ‐3‐hydroxy valerate) (PHBV) and poly(ethylene oxide) (PEO) were prepared by casting from chloroform solutions. Crystallization kinetics and melting behavior of blends have been studied by differential scanning calorimetry and optical polarizing microscopy. Experimental re…
In this study, the nine coordination polymers of Fe(III), Co(II) and Ni(II) salts have been synthesized using polyacrylamide (PAA), polt(ethylene glycol) (PEG) and poly(vinyl alcohol) (PVA) and their structures were characterized by magnetic and conductivity measurements, ultraviolet‐visible (UV‐VIS), FTIR spectroscop…
Abstract Argon plasma at atmospheric pressure was used to improve the wettability and dyeability of natural bamboo fibers. Optical emission spectroscopy (OES) was employed to characterize the discharge. SEM and scanning probe microscopy (SPM) analyses show that the fiber surface becomes rougher after plasma treatment…
We report on the design, fabrication, electro-optical performance, and stability of switchable polarization gratings formed in azo-dye-doped nematic liquid crystals. Stable gratings are demonstrated even after applying saturating electric fields (8V∕μm) and after heating to extreme temperatures (T=190°C). A simple phe…