Materials Literature
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Anhydride-cured epoxies are used in electrical engineering to manufacture insulators. The purpose of this study is to determine the modifications undergone by these resins when exposed to solar-type radiation (radiation with a wavelength of more than 300 nm). Two epoxy–anhydride systems have been studied. Using transm…
The use of graft copolymers of starch and glycidyl methacrylate (starch-g-PGMA) to improve the mechanical properties of composites with poly(hydroxy butyrate-co-valerate) (PHBV) has been investigated. In general, the tensile and flexural strengths of the composites were greater with starch-g-PGMA compared to untreated…
The phase behavior and rheology of binary blends of polystyrene (PS) and poly(α-methylstyrene) (PαMS), exhibiting upper critical solution temperature (UCST), and binary blends of PS and poly(vinyl methyl ether) (PVME), exhibiting lower critical solution temperature (LCST), were investigated. For the study, (i) PS-40/P…
In polyisocyanates with chiral azo chromophores a change of the helical conformation can be triggered photochemically. In this investigation we studied the correlation between the isomerization of the main chain and the photoisomerizable side groups by CD measurements. A few minutes of irradiation are enough to reach…
In contrast to most diblock copolymers which exhibit the classical upper critical ordering transition (UCOT), polystyrene- b -poly n -butyl methacrylate PS- b -PBMA has been shown to undergo ordering upon heating through a lower critical ordering transition (LCOT). Here we report the phase behavior of a family of dibl…
Three types of hydroxyl terminated poly(butadiene) (HTPB) networks having different NCO/OH reactive group ratios were prepared using three different reactive systems (i.e., Desmodur N-100 pluriisocyanate, isophorone diisocyanate (IPDI)/trimethylol propane (TMP), and hexamethylene diisocyanate (HMDI)/TMP). Desmodur N-1…
A series of mono- and disubstituted cationic porphyrins (1-8) were synthesized and investigated for their ability to bind and cleave DNA in the presence of light. In these porphyrins, the cationic substituents were introduced at various peripheral positions, i.e., the non-meso positions of the porphyrin system. The mo…
Blends of atactic poly[( R, S )-3-hydroxybutyrate], a-PHB, with poly(ε-caprolactone), PCL, and with poly( l -lactic acid), PLLA, were obtained in the form of compression-molded films. The phase behavior of the blends was different: a-PHB and PCL were totally immiscible, whereas a-PHB/PLLA blends were miscible over the…
We report the first evidence of the potential of new amphiphilic ABA-triblock copolymers as gelling agents for lamellar liquid crystalline L α phases. Recently, we described a new type of lamellar hydrogels which are not based on a polymer network swollen in water but are obtained by the addition of small amounts of a…
Smectic state morphology of the main-chain liquid crystal PB-14 polyester was studied by small-angle X-ray scattering (SAXS), differential scanning calorimetry, and transmission electron microscope methods. The PB-14 polyester forms isotropic liquid (I), smectic H (S H ), and crystalline phases in order of decreasing…
We have investigated the ordering dynamics of a triblock copolymer of a polystyrene- block -polyisoprene- block -polystyrene with asymmetric composition from the disordered sphere phase, where spherical microdomains exist but they have only a short-range liquidlike order, to the cylindrical and spherical microdomains…
We report detailed nucleation studies on the liquid-to-solid transition of hexadecane using nearly monodisperse hexadecane-in-water emulsions. A careful consideration of the kinetics of isothermal and nonisothermal freezing show deviations from predictions of classical nucleation theory, if one assumes that the emulsi…
We present first-principles calculations of the structural and electronic properties of Si(001)-SiO2 interfaces. We first arrive at reasonable structures for the c-Si/a-SiO2 interface via a Monte-Carlo simulated annealing applied to an empirical interatomic potential, and then relax these structures using first-princi…
The continuing miniaturization of microelectronics raises the prospect of nanometre-scale devices with mechanical and electrical properties that are qualitatively different from those at larger dimensions. The investigation of these properties, and particularly the increasing influence of quantum effects on electron t…
The first examples of thermoset polyurethane−clay nanocomposites have been prepared by curing a polyurethane network in the presence of alkylammonium-exchanged forms of montmorillonite. A unique stress−strain behavior was observed for the elastomeric nanocomposites. The reinforcement effects of the silicate nanolayers…
Free-standing aligned carbon nanotubes have previously been grown above 700 degreesC on mesoporous silica embedded with iron nanoparticles. Here, carbon nanotubes aligned over areas up to several square centimeters were grown on nickel-coated glass below 666 degreesC by plasma-enhanced hot filament chemical vapor depo…
Hollow silica and silica-polymer spheres with diameters between 720 and 1000 nanometers were fabricated by consecutively assembling silica nanoparticles and polymer onto colloids and subsequently removing the templated colloid either by calcination or decomposition upon exposure to solvents. Scanning and transmission…
In this paper, a novel type of red sensitive photo-polymer system for optical storage, here called RSPP, is presented. First of all, the components in RSPP, for example, photo- sensitizer, photo-initiator, monomer, copolymer, combiner, stabilizer, hardener, and fabrication and processing technique of RSPP are given. T…
We show that under certain conditions one-dimensional dielectric lattice possesses total omnidirectional reflection of incident light. The predictions are verified experimentally using Na3AlF6/ZnSe multilayer structure developed by means of standard optical technology. The structure was found to exhibit reflection coe…
A review is presented of the debates between the present authors and other investigators regarding the possible role of diffusional creep in the plastic flow of polycrystalline metals at low stresses. These debates are recorded in eleven papers over the past seventeen years. ln these papers it has been shown that the…