Materials Literature
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Abstract Maleic anhydride (MAH) modified polypropylene (PP) was demonstrated to be a chemical coupling agent in filled PP compounds. Improved properties were shown for talc and wollastonite filled PP compounds with MAH modified PP as a coupling agent. Partial replacement of glass fiber with wollastonite showed no redu…
A university library should be able to provide access to industrial standards through a properly developed collection policy and an ability to quickly acquire needed standards. The collection should support instruction in the basic curriculum and important areas of research at the university. Collecting beyond the min…
This paper presents a study of oxygen diffusion in YBa 2 Cu 3 O 7- (YBCO) using isothermal thermogravimetric analysis. Comparing the results of a solution of Fick's second law to the experimental data, it has been possible to calculate an expression for the chemical diffusion coefficient of oxygen in YBCO. The good ag…
High-temperature annealing experiments on metamorphic kalsilite (KAlSiO 4 ) indicate that there is an irreversible phase transition from the P31c to P63 structure at ~200 °C. Powder X-ray investigations indicate that the transformation is incomplete. The proportion of P6 3 phase increases as a function of temperature,…
Interactions of metals with inorganic and organic ligands including polymers are reviewed. Direct methods of synthesis have many possibilities in comparison to conventional synthetic methods. However, cryosyntheses with chelate-forming ligands have not been sufficiently devel—oped at the present time. Cryosyn thesis i…
A set of model compounds that mimic the graft sites of maleic anhydride (MA) functionalized polyolefins was synthesized and characterized with NMR spectroscopy. The acquired carbon nuclear magnetic resonance data were used to deduce chemical-shift increments for the prediction of 13C chemical shifts of MA functionaliz…
Abstract In a recent paper [1], the preparation techniques, structural features, crystallization, melting characteristics, and certain properties of the β-modification of isotactic polypropylene (β-IPP) were reviewed. Possible uses of β-IPP were demonstrated through example applications. The problems involved with the…
O balanço das reações de reticulação e cisão em cadeias poliolefínicas, quando expostas a condições ambientais de radicais livres, pode resultar em boas propriedades e novas aplicações. Materiais descartados de alta qualidade despertam cada vez mais interesse para reciclagem. Os resíduos plásticos de embalagens alimen…
A porous silicon lm (PS) was investigated by FTIR, Raman and photoluminescence (PL) spectroscopies. The Raman and PL spectra were obtained using four different laser excitations: 488, 514, 633 and 782 nm. The analysis of the first order and second order Raman scattering lines permits to identify the band energy struct…
Hydrothermally synthesized pyrophyllites (400° and 450 °C at 1 kbar for 7 days) have been compared to natural pyrophyllite in its dehydroxylation behaviour using infrared emission spectroscopy (IES). Upon heating to 750 °C dehydroxylation results in the loss of one OH group and the H associated with the next OH group…
<div class="htmlview paragraph">The lower temperatures encountered with European Stage III/IV turbo charged direct injection (DI) Diesel engines with additional features such as cooled exhaust gas recirculation (EGR), compared to Stage II engines, means that modern light duty Diesel engine exhaust gas will rarel…
We have investigated the anisotropic molecular orientation of poly [4, 4'-oxydiphenylene-1, 2, 3, 4-cyclobutanetetracarboximide] (CBDA-ODA) films induced by irradiation with linearly polarized ultraviolet light (LPUVL). The molecular orientation was monitored by measuring the polarized infrared (IR) absorption spectra…
The temperature-frequency behavior of the permittivity ϵ' (T, f) and tan[δ(T, f)] (5—300 K, 100 Hz-1 MHz) were comparatively studied in nominal pure KTaO3 and K1-xLixTaO3 (x = 0.001, 0.01 and 0.03) doped by Cu and Fe single crystals. In the ϵ' (T, f) behavior doping of KTaO3 by Fe (1 wt%) and Cu (0.8 and 3 wt%) result…
The fracture process of steel fiber/cementitious matrix composites has been studied using a single‐fiber pullout test that permits detailed measurements of the load‐crack opening displacement relationship during fiber debonding and unloading. Using a suitable analytical model, the interfacial fracture energy and inter…
A new, thermally curable, aqueous acrylic resin is introduced as duroplastic binder for automotive trim parts. This one-component resin has good storage stability and crosslinks upon heating to 180–220°C. Wood fibers are impregnated with the resin using the blow-line technique and can be further processed to fiber mat…
Er 3+ singly- and Er3+/Yb3+-codoped fluorozirconate glasses were prepared. The upconversion emission intensities of the Er3+ ion around both 550 and 660 nm were measured under 800 nm excitation. The absorption band of the Yb3+ ion is located around 980 nm. Though the absorption band of Yb3+ does not interact directly…
The unit-cell parameters of lead phosphate, Pb(3)(PO(4))(2), have been measured by single-crystal X-ray diffraction in a diamond-anvil cell under hydrostatic conditions to a maximum pressure of 6 GPa. The compound undergoes an improper ferroelastic phase transition at 1.81 +/- 0.01 GPa at 298 +/- 1 K from a low-pressu…
Amorphous CN:Ti films deposited by using the reactive magnetron sputtering method were annealed in vacuum under 200 to 600° C. Incorporation of Ti (less than 3 at.%) has brought some new perspectives to the material. Electron-energy-loss spectrum indicates improved conductivity in CN:Ti films as in the insulating CN f…
A series of aliphatic 1, 4-diaminobutane based polyamides 4. y with y = 8, 9, 10 and 12 was synthesized and characterized. For comparison, some 1, 6-diaminohexane based counterparts were also studied. PA 4.12, and in particular PA 4.10, proved to have a very beneficial combination of T m , crystallization rate and phy…
O presente trabalho trata da preparação e caracterização de membranas de quitosana porosas e densas, que possuem diversas aplicações tecnológicas. Para tanto, foram utilizadas as técnicas de microscopia (microscopia eletrônica de varredura - MEV - e microscopia de força atômica -MFA), titulação potenciométrica e espec…