Materials Literature
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A new interesting category of polyconjugated polymer, poly(3,5-benzylidene)isopropylpiperidone, was obtained by condensation of isopropylpiperidone with terephthalaldehyde. Copolymerization and terpolymerization with cyclopentanone and/or cyclohexanone were also carried out. The model compound was prepared by the cond…
The structure of bound rubber in the composites from fumed silica (A200, Nippon Aerosil Co., Japan) and polyethylacrylate rubber (PEA) was studied as a function of mixing temperature. The fraction of bound rubber in the composites increased gradually with increasing the mixing temperature from 80 to 120°C, followed by…
The objective of this study was to enhance the degradation of the homopolymer of epsilon-caprolactone (epsilon-CL) through its copolymerization with a second lactone monomer: delta-valerolactone (delta-VL), gamma-butyrolactone (gamma-BL), gamma-valerolactone (gamma-VL), and gamma-caprolactone (gamma-CL). The influence…
An elastomer/rigid particle filler with core–shell structure was prepared by twin-screw extruder according to an encapulation model. It was used to toughen and reinforce polypropylene (PP). An original idea of a one-step processing method was adopted in creating PP/polyoctene–ethylene/talc ternary composites. The rheo…
Methylenediphenyl diisocyanate (MDI) was used as the chain extender for low molecular weight poly(lactic acid) (PLA) to produce high molecular weight biodegradable polymer material with a better heat resistance. PLA prepolymer with a number-average molecular weight (Mn) of 5800 and a weight-average molecular weight (M…
A series of polyurethanes with different siloxane contents were synthesized, which were based on 4,4′-methylene diphenyl diisocyanate (MDI), poly(tetramethylene oxide) (PTMO), aminoethylaminopropyl poly(dimethyl siloxane) (AEAPS), and butanediol (BD). The chemical compositions, structures, and bulk and surface propert…
The effects of zinc stearate (ZnSt2) and/or epoxidized soybean oil (ESO) on mechanical properties and on thermal stability of plastigels obtained from polyvinylchloride (PVC) and dioctylphthalate (DOP) plastisols were studied using calorimetric, spectroscopic, and tensile-testing techniques. Plastigels having 2.5 or 5…
Improving the design and performance of medical stents for implantation in the human body is of current interest. This paper describes a study of fatigue-crack propagation behavior in the superelastic alloy Nitinol. Specifically, the objective of this work was to study the effect of environment on cyclic crack-growth…
Calcium salts of suberic (Ca-Sub) and pimelic (Ca-Pim) acids were synthesized and implemented as in different grades of isotactic polypropylene (iPP). Propylene homopolymer, as well as random and block copolymers containing these additives, crystallized iPP into pure or nearly pure β modification in the isothermal and…
The site specificity for elementary steps important in hydrocarbon oxidation are investigated on oxidized Mo(110). Our studies illustrate how detailed mechanistic information is obtained about surface reactions by separating complex problems into elementary reaction steps on well-defined materials. This methodology is…
Differential scanning calorimetry was used to follow the oxidation course of the saturated fatty acids lauric, myristic, palmitic, and stearic and their ethyl esters and, additionally, glycerol tripalmitate and tristearate. Assessment of the oxidative stability of these fat components was performed at 90−300 °C withou…
The behavior of ZSM5 zeolites in the acid, sodium form or ion-exchanged with various metal ions (Cs, Sr, Ba, Mg, Fe, Co, Cu, Ag, Rh, Ga, In, La, and Ce) and that of Y and X zeolites ion-exchanged with Ba ions are discussed with reference to their behavior in the adsorption of N 2 O from gaseous industrial streams cont…
Water transfer through different films, as a function of the physical state of water in contact with the film, the relative humidity difference, and the water vapor pressure difference, was investigated. The films were two synthetic packagings (hydrophobic polyethylene and hydrophilic cellophane) and an edible film. T…
Natural unsaturated fatty acids oleic, erucic, linoleic, and linolenic and their ethyl esters and, additionally, glycerol trioleate and trilinoleate were oxidized with linear-programmed heating rates of 1−25 K/min at 50−300 °C. The oxidation course was monitored by differential scanning calorimetry to determine the ox…
The surface properties of a poly(dimethylsiloxane) elastomer have been modified by reacting an allyl amide functional perfluorinated ether (PFE) to the siloxane network by a hydrosilation reaction. Examination of the surface by contact angle and X-ray photoelectron spectroscopy revealed that the perfluorinated ether m…
Quaternized poly(propylene imine) dendrimers have been prepared and investigated for their ability to function as pH-responsive controlled-release systems. These functionalized dendrimers are able to solubilize pyrene due to charge transfer complexation between the probe and the tertiary amino groups of the dendrimeri…
Second harmonic generation in CdSe nanocrystal quantum dots is observed by Hyper-Rayleigh scattering. The size dependence of the first hyperpolarizibility β was investigated for the nanocrystals in solution. The value of β per nanocrystal decreases with size down to approximately 13 Å in radius. An increase is observe…
YBCO films were successfully prepared on biaxially textured Ag{110}<211> substrates by using pulsed laser deposition. X-ray diffraction results showed that the degree of preferential orientation of Ag{110}<211> substrates varied with increasing annealing temperature. With a thin template layer deposited at low tempera…
We briefly discuss how the wetting properties of a fluid/solid interface can indirectly influence the diffusion properties of fluid confined between two solid walls. This influence is related to the variability of the hydrodynamic boundary conditions at the interface, which correlates to the wetting properties.
Two different porous hydrogen-bonded networks are formed by self-assembly of the radially substituted host 1. In the network of type A, formed by 1⋅4 Et2O, all OH groups of 1 are involved in hydrogen bonding, and the molecular sheets are stacked without translation to generate extended channels that accommodate the Et…