Authors:L. Mendes, R. Abrigo, V. Ramos, and P. Pereira
when a crystalline polymer is blended with an amorphous one. These characteristics have become PET/PC blend feasible for automotive, packaging applications and so on [ 3 , 4 ]. Reactive blending has been performed as a route for producing PET/PC blend
Authors:Chung-Hsin Wu, P. K. Andy Hong, and Ming-Yan Jian
in wastewaters. Dyes are readily discernible at small quantities and adversely affect the water environment. Therefore, the removal of color from wastewater often takes priority over the treatment of other colorless organics. Reactive Red 2 (RR2), a
Thermal behaviour of blends based on N,N'-bis(4-itaconimidophenyl) ether (IE) and 4,4'-bis(4-allyl-2-methoxyphenoxy) benzophenone
(R1) or 4,4'-bis(2-allylphenoxy) benzophenone (R2) are described in this paper. The reactive diluent content was varied from 5-50% (mass/mass) in these blends. A decrease
in the melting point and exothermic peak temperature was observed with increasing mass percent of reactive diluent. Thermal
stability of blends was affected at high mass percentage of reactive diluents.
Authors:E. van der Merwe, Christiena Strydom, and A. Botha
Medium reactive magnesium oxide reacts incompletely with available water to form magnesium hydroxide. To enhance the hydration
of medium reactive magnesium oxide, the effect of magnesium acetate as hydrating agent was studied. The extent to which different
parameters (concentration of magnesium acetate, solution temperature and solid to liquid ratio of MgO to magnesium acetate)
influence the hydration rate of a medium reactive industrial sample of magnesium oxide were evaluated. The degree of rehydration
measured as percentage Mg(OH)2being formed, increases from approximately 56% using 0.5 M magnesium acetate solutions at 25C to 64% at 50C, to more than
70% at 70C. The major part of rehydration of the medium reactive MgO sample occurs within the first few minutes of the reaction
for all three temperatures studied.
A set of seven bituminous coal chars has been characterised by IR spectroscopy (FTIR), thermogravimetry (TG) and elemental
analysis. FTIR study provided suitable information to establish differences between coal samples according to their chemical
compositions. The reactivity of these samples was also studied and correlated with the coal parameters of mean vitrinite reflectance,
fuel ratio and H/C ratio. The data suggest that reactivity as determined can be correlated with the mean vitrinite reflectance,
fuel ratio and H/C ratio (0.90). The order of reactivity of samples were; Amasra (S1) (Rm= 0.65)>Azdavay (S4) (Rm=0.99)Armutcuk (S2) (Rm=0.81)Acenta (S3) (Rm=0.92)>Ac2l2k (S6) (Rm=1.11) Cay (S5) (Rm=1.03)>Sogutozu (S7) (Rm=2.14).
Authors:K. Oohashi, N. Nogawa, Y. Tanno, and N. Morikawa
The reactivity of recoil tritium in the T-for-H substitution was studied in mixtures of benzene, hexane, cyclohexane or cyclohexane-d12 with lithium carbonate which were irradiated in a reactor. The relative rates per C–H bond of hexane and cyclohexane to benzene were somewhat less than one third. The H/D isotope effect in cyclohexane was given as 1.14.
The thermochemical reduction of a series of structurally and morphologically different natural and synthetic manganese(IV) oxides has been investigated. Measurements have been performed by means of combined thermogravimetry/mass spectrometry, X-ray diffraction and analytical scanning electron microscopy. The mechanisms of the degradation of these materials have been characterized in order to establish standardized procedures for their reactivity as function of structure, morphology and experimental conditions. The corresponding results are the fundament with respect to a reproducible technical application.
Recently, it was reported that the toxicity of copper particles increases with the decrease of the particle size on a mass
basis. To understand this phenomenon, inductively coupled plasma mass spectrometry (ICP-MS) techniques and in vitro chemical
studies were carried out to explore how they produce toxicity in vivo. The results suggest that when the sizes of particles
become small and down to a nanoscale, copper becomes extremely reactive in a simulative intracorporeal environment. The nanosized
copper particles consume the hydrogen ions in stomach more quickly than micron ones. These processes further convert the copper
nanoparticles into cupric ions whose toxicity is very high in vivo.