Materials Literature
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Abstract Thermal stability and decomposition mechanism of poly( p ‐acryloyloxybenzoic) acid (PABA), p ‐methacryloyloxybenzoic acid (PMBA), and their graft coproducts of PP were studied by differential scanning calorimetry, direct pyrolysis mass spectrometry, and TG/IR system, combined thermogravimetric analyzer, and F…
Purpose – The purpose of this paper is to compare thick and thin film microstripline response to conducting overlay.
Abstract The molecular orientation distribution of poly( p ‐dioxanone) (PPDX) uniaxially oriented commercial fibers was determined by polarized Raman spectroscopy and X‐ray diffraction. The order parameters 〈 P 200 〉 and 〈 P 400 〉 of the orientation distribution function were determined by polarized Raman spectroscopy…
Abstract In this work, polyaniline (PANI)–rhodium composites have been obtained for the first time. Their preparation procedure has involved reduction of Rh 3+ ions in RhCl 3 aqueous solutions with NaBH 4 in the presence of PANI. Using UV–vis spectroscopy, it has been found that the reduction process is fast. X‐ray di…
Abstract Melt grafting of acrylic acid (AA) and butyl acrylate (BA) (equal molar ratios) onto low‐density polyethylene (LDPE) was carried out in Haake internal mixter by free radical grafting copolymerization. The graft degree of AA and BA in the grafted LDPE (LDPE‐ g ‐(AA+BA)) was determined by FTIR. The influences o…
We computed the complete phase diagram of the symmetrical colloidal electrolyte by means of Monte Carlo simulations. Thermodynamic integration, together with the Einstein-crystal method, and Gibbs-Duhem integration were used to calculate the equilibrium phase behavior. The system was modeled via the linear screening t…
Abstract A monomer design having a bulky terminal tricyclodecane (TCD) unit linked via hydrogen bondable urethane to an ethyleneoxy methacrylate unit, and capable of generating three‐dimensional honeycomb patterns upon solvent casting has been investigated. Random copolymers as well as a diblock copolymer Poly(Sty 42…
Abstract Well‐defined silica composite nanofibers are generated in a silicification process of self‐assembled poly(ethylene oxide)‐peptide nanotapes. Inspired by biological silica morphogenesis processes the nanotapes exhibit strong binding capabilities for silicic acid. Thus, pre‐hydrolyzed tetramethoxysilane could b…
Abstract A new method for determining the extent of reaction of thermoset elastomers was developed based on equilibrium swelling and dynamic mechanical analysis (DMA). The extent of reaction was defined based on the molecular weight between crosslinks ( M c ) of a polymer sample in relation to M c at the onset of gela…
Abstract Resorting to ‘click chemistry’, four photochromic dendrimers, A‐Tri‐SP, B‐Tri‐SP, C‐Tri‐SP, and D‐Hex‐SP, have been synthesized facilely in sound yields of 85, 88, 94, and 80%, respectively. These dendrimers have been obtained by the straightforward coupling of azido‐attached photochromic spiropyran units to…
The tetra- and binuclear heterometallic complexes of nickel(II)-vanadium(IV/V) combinations involving a phenol-based primary ligand, viz., N,N'-dimethyl-N,N'-bis(2-hydroxy-3,5-dimethylbenzyl)ethylenediamine (H2L1), are reported in this work. Carboxylates and beta-diketonates have been used as ancillary ligands to obta…
Abstract A new pathway for the synthesis of HPMA graft copolymers was developed and their self‐assembly into hybrid hydrogels was investigated. Linear water‐soluble polyHPMA was chosen as the polymer backbone, whereas coiled‐coil forming peptides, covalently attached to the backbone, formed the grafts. Peptides of dif…
The reaction of the 1,2,3,5-dithiadiazolyls (4-R-C(6)H(4)CN(2)S(2))(2) (R = Me, 2a; Cl, 2b; OMe, 2c; and CF3, 2d) and (3-NC-5-tBu-C(6)H(3)CN(2)S(2))(2) (2e) with [CpCr(CO)(3)](2) (Cp = eta(5)-C(5)H(5)) (1) at ambient temperature respectively yielded the complexes CpCr(CO)(2)(eta(2)-S(2)N(2)CC(6)H(4)R) (R = 4-Me, 3a; 4…
We report here the use of liquid-feed flame spray pyrolysis to produce 14 nanopowders along the Al 2 O 3 −MgAl 2 O 4 tie-line by combusting varied ratios of aerosolized ethanol solutions of alumatrane [Al(OCH 2 CH 2 ) 3 N] and magnesium acetylacetonate [Mg(C 5 H 7 O 2 ) 2 ]. The resulting nanopowders were characterize…
The syntheses, crystal structures, and magnetochemical characterization are reported for three new mixed-valent Mn clusters [Mn(8)O(3)(OH)(OMe)(O(2)CPh)7(edte)(edteH(2))](2)CPh) (1), [Mn(12)O(4)(OH)(2)(edte)(4)C(l6)(H(2)O)(2)] (2), and [Mn(20)O(8)(OH)(4)(O(2)CMe)(6)(edte)(6)](ClO(4))(2) (3) (edteH(4) = (HOCH(2)CH(2))(…
Generally, single layer antireflective (AR) coatings are based on SiO2 for which the low refractive index is achieved by increasing the porosity of the films. On the other hand, the increase of porosity on any material results in a decrease of its mechanical properties. In addition to increasing the solar transmittanc…
Abstract The mechanical, morphological, and rheological properties of polymer blends based on polystyrene (PS) and three different types of polybutadiene (PB) were studied. The polymer blends containing 20% of PB were processed in a Haake mixer at 180°C and 60 rpm for 6 min. The materials exhibited impact strength sup…
Abstract Poly(methacrylic acid)‐grafted chitosan membranes (chitosan‐ g ‐poly(MAA)) were prepared in two sequential steps: in the first step, chitosan membranes were prepared by phase‐inversion technique and then epichlorohydrin was used as crosslinking agent to increase its chemical stability in acidic media; in the…
Abstract A novel silver/poly(carbonate urethane) nanocomposite was prepared through in situ reduction of a silver salt (AgNO 3 ) added to a solution consisting of a commercial poly(carbonate urethane) dissolved in N,N ‐dimethylformamide (DMF). In this system, the presence of the poly(carbonate urethane) was proved to…
Mathematics is an essential part of the very definition of nanotechnology and is a powerful tool in nanomedicine and biology in the fight against disease. This Essay discusses the fundamental role of mathematics in integrating multiple disciplines around the various length scales and helping to identify methods of det…