Materials Literature
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A small amount of locally reversible melting and crystallization in poly(ethylene terephthalate) (PET) has been detected by temperature-modulated differential scanning calorimetry (TMDSC). Extended-time TMDSC was used in the quasi-isothermal mode. Studied were melt-crystallized, quenched, and a biaxially-oriented film…
Over the past decade, developments in molecular biology, X-ray diffraction and nuclear magnetic resonance (NMR) instrumentation, and computational methods have allowed nearly exponential growth of macromolecular structural studies. The analysis of data from these studies generally requires sophisticated computational…
A kinetic theory of glasses is developed using equilibrium theory as a foundation. After establishing basic criteria for glass formation and the capability of the equilibrium entropy theory to describe the equilibrium aspects of glass formation, a minimal model for the glass kinetics is proposed. Our kinetic model is…
Dynamical simulations of bulk sedimentation have been carried out, using up to 32 000 solid particles. There is no evidence that the long-range hydrodynamic interactions are screened by changes in the pair correlation function at large distances. Instead the velocity fluctuations and diffusion coefficients diverge lin…
We present new experimental data and molecular simulation results for the adsorption of nitrogen in MCM-41. We show that models in which the solid−fluid interaction potential is homogeneous cannot reproduce the form of the adsorption isotherm, particularly at low pressures. A new heterogeneous interaction model is sho…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTCatalytic Asymmetric Epoxidation of α,β-Unsaturated Ketones Promoted by Lanthanoid ComplexesMasahiro Bougauchi, Shizue Watanabe, Takayoshi Arai, Hiroaki Sasai, and Masakatsu ShibasakiView Author Information Faculty of Pharmaceutical Sciences, University of Tokyo Hongo,…
Nowadays, the methodology existing to measure the shrinkage in air, developed for paste and cement mortars, has serious problems to be applied to lime mortars, due to its different mechanism of hardening several modifications in Norms UNE 80-113-86 y 80-112-89 make possible the determination of the shrinkage in these…
Rendering mortars, which are still exposed to the open air on some of the walls of Medina Azahara, are studied and characterized in this work. Some repairing mortars used in different previous restorations are also characterized. Those rendering mortars are of different make considering the composition of their binder…
Some microscopy methods that can be applied to the quantification of the percentage of vitreous particles of blast furnace slags are reviewed. Details of sample preparation are included and the experimental procedure is briefly described. The main advantages and inconveniences of each method are also considered. All o…
Abstract Polymer degradation occurs when macromolecular chains are broken under the influence of thermal, mechanical or chemical energy. Chain‐end depolymerization and random‐ and midpoint‐chain scission are mechanisms that have been observed in liquid‐phase polymer degradation. Here we develop mathematical models, un…
Acoustic emission was monitored during salt crystallisation cycles in order to study the mechanisms of rock deterioration by sodium sulphate in laboratory tests. Some porous carbonate stones used in Spanish monuments (Cathedral of Oviedo, Murcia and Seo Vella of Lérida) were selected for this study. The acoustic emiss…
Protective clothing should ideally provide maximum comfort and protection for the wearer. The design and fit of a garment are factors which can affect both the protective aspects of a garment as well as its comfort. Proper garment fit depends on the relationship of the size of the garment compared with the size of the…
Copolymers of N,N-dimethylaminoethyl methacrylate (DMAEMA) and acrylamide (AAm) were prepared to demonstrate a temperature-induced phase transition. Poly DMAEMA has a lower critical solution temperature (LCST) around 50°C in water. With copolymerization of DMAEMA with AAm, the LCST shifts to the lower temperature was…