Materials Literature
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Poly(butylene terephthalate) (PBT), a thermoplastic polyester, was melt blended with acrylonitrile-butadiene-styrene (ABS) terpolymer using styrene-maleic anhydride (SMA) as the compatibilizer. The PBT : ABS ratio was fixed at 70 : 30 by weight and weight percent (wt %) of SMA was varied as 2.5, 5, and 7.5. The effect…
Isothermal melt and cold crystallization kinetics of PEDEKmK linked by meta-phenyl and biphenyl were investigated by differential scanning calorimetry in two temperature regions. Avrami analysis is used to describe the primary stages of the melt and cold crystallization, with exponent n = 2 and n = 4, respectively. Th…
The morphological changes of blends of nylon-6 and acrylonitrile-butadiene-styrene (ABS) with reactive compatibilizer [poly(N-phenylmaleimide-styrene-maleic anhydride)] as a function of viscosity ratio of the components, concentration of compatibilizer, and the feed rate have been studied using an intermeshing corotat…
A relationship between heat generation of filled rubber vulcanizates and hysteresis loss, specific heat, thermal conductivity, modulus, filler loading, structure, and surface area of the filler, the temperature difference between application temperature and glass transition temperature, frequency, temperature differen…
The Chemistry of Polymers, 5th Edition, is fully updated with the latest developments in polymer science providing a highly readable textbook for those requiring a broad overview of the subject. Like previous editions, the book continues to explore the subject from an applications point of view, providing a comprehens…
Mass transport properties of silicate liquids exhibit complex behavior as a function of pressure, as the tetrahedral framework structure of the liquid shifts to a more compact arrangement of atoms. For highly polymerized aluminosilicate liquids, oxygen diffusivities pass through a maximum at pressures below 10 gigapas…
The shape memory behavior of a series of polycaprolactone/methane diisocyanate/butanediol (PCL/MDI/BDO) segmented polyurethanes of different composition was studied. The molecular weight of PCL diols was in the range of 1600–7000, and the hard segment content varied from 7.8 to 27% by weight. Film specimens for shape…
Garito and co-workers have suggested a mechanism to dramatically increase the second hyperpolarizability, gamma, in linear pi-electron-conjugated molecules. Polarization is introduced that leads to a difference between the dipole moments of the molecule's ground state and excited state. Here a series of carotenoids wa…
Fourier transform infrared measurements on the spectra of the products of the evaporation of silicon/carbon mixtures trapped in Ar at ∼10 K, combined with the results of ab initio calculations published earlier, and density functional theory (DFT) calculations carried out in the present work, have resulted in the dete…
The (PZT 53/47) and (PZT 20/80) films deposited on substrates by RF magnetron sputtering are single-phase epitaxial films. In order to prevent large thermal stresses being induced in the films during the preparation process, the PZT films were cooled slowly through the Curie temperature. Scanning electron microscopy (…
The conductivity of -doped emeraldine polymers is studied as a function of temperature in the range . The dopant concentration of the samples varies between 0.1 M and 1.0 M. The temperature dependence of the dc electrical conductivity gives evidence for a transport mechanism based on variable-range hopping in three di…
The results of a density-functional-theory study of the formation energies of (100)- and (111)-faceted steps on the Pt(111) surface, as well as of the barrier for diffusion of an adatom on the flat surface, are presented. The step formation energies are found to be in a ratio of 0.88 in favour of the (111)-faceted ste…
We perform extensive simulations of $10^4$ Lennard-Jones particles to study the effect of particle size dispersity on the thermodynamic stability of two-dimensional solids. We find a novel phase diagram in the dispersity-density parameter space. We observe that for large values of the density there is a threshold valu…
Although the Ni_4 cluster includes more information regarding the Ni band structure with respect to the Anderson impurity model, it also favors very peculiar ground states which are incompatible with a coherent picture of all dichroism experiments.
We report detailed and extensive first-principles molecular-dynamics (MD) simulations of the structure and electronic properties of amorphous InP produced by rapid quenching from the liquid. The structure of the material is found to be strongly ordered chemically, even though there is a significant number of coordinat…
RC部材の動的解析と復元力特性の合理的な計算方法には, 精度の高い鉄筋の交番繰り返し構成モデルが不可欠である. 加藤モデルはその要件を満たす優れた履歴モデルである反面, プログラム化の難易度が高い. 本研究は, 加藤モデルと同等の精度と適用範囲を有し, かつプログラム化が容易であり, 構造的なモジュールの構成が採用できるような数値材料モデルを提案し, あわせて動的RC非線形解析の今後, 一層の普及の一助とすることにある. 提案したモデルは, 単純な履歴則に従う構成要素の応力の重ね合わせで表されるものであり, 任意履歴に対しても妥当な応答を示している. また, そのプログラムの実行行数は, 筆者等の経験では, 加藤モデルに比較してお…
Introduction - crystal chemistry in materials science fundamentals of atoms, molecules and solids fundamentals of crystallography crystal structures structure change of crystals.
The algorithm for Dissipative Particle Dynamics (DPD), as modified by Español and Warren, is used as a starting point for proving an H -theorem for the free energy and deriving hydrodynamic equations. Equilibrium and transport properties of the DPD fluid are explicitly calculated in terms of the system parameters for…
A composite - 25% vol Teflon was prepared to prevent breakages in powder pellets due to the phase transition of and, thus, to study the effect of the phase transition on conduction. The composite microstructure, as followed by scanning electron microscopy, shows aggregated particles surrounded by Teflon regions which…
The observation of electron interference effects provides direct evidence of the coherence of the electrons emitted from a carbon nanotube. To demonstrate this, the low-energy electron point source microscope has been used to mount an individual carbon nanotube onto a tungsten tip. In subsequent experiments, the elect…