Search results

Study on the thermal behaviors and the morphology in PVP/ PA66 blends Chaowei Hao1,a, Qingfang Ma1,b, Zheng Wang1,c, Jianxiong Jiang1,d and laiguoqiao1,e Key Lab of Organosilicon Chemistry and Material Technology Ministry of Education, Hangzhou Normal University, Hangzhou 310012, P.
Generally, no evidence of any banded structure can be observed for PA66 spherulites crystallized under 250oC.
The most interesting phenomenon in the present work was the formation of the banded structure in PA66 spherulites in the presence of high PVP content (see Figure 5).
When the PVP content was 80%, the banded structure became obscure.
The most interesting thing was to observe the formation of the banded structure in PA66 spherulites in PA66/PVP blends with high PVP content.

IRITEL, Belgrade, Serbia and Montenegro 3 The Vin,a Institute of Nuclear Sciences, Belgrade, Serbia and Montenegro 4 Faculty of Physical Chemistry, Belgrade, Serbia and Montenegro 5 Jožef Štefan Institute, Ljubljana, Slovenia Keywords: Barium Titanate, Multilayer Materials, Screen-printing ABSTRACT BaTi1-xSnxO3 (BTS) piezoceramics with multilayer structure were prepared.
The crystal structure of other synthesized powders was not exactly determined.
The existence of domains with different orientations introduces additional complications during crystal structure examination by XRPD method.
Indications of the presence of tetragonal structure at room temperature have been found for our samples with less than 15 mol % of Sn.
Galasso, “Structure, Properties and Preparation of Perovskite-Type Compounds”, Pergamon Press, New York, 1969

So the joining of titanium and bronze alloy to form compound structure is necessary, and can reduce the mass of structure.
However, the properties of Ti and Cu have great differences in crystal structure, melting point, heat conductivity, and linear expansion coefficient.
Diffusion of atoms proceeds by many mechanisms, such as exchange of places between adjacent atoms, motion of interstitial atoms or motion of vacancies in a crystalline lattice structure.
Vacancy is referred to an unoccupied site in a lattice structure.
Strohaecker, Composites Science and Technology 66 (2006) 2063–2068 [3] 3.091 – Introduction to Solid State Chemistry by Shermon, P.G [4] CAM 4 KOCAK M.

Significant mechanical and physical properties such as lightness and strength made these CNTs unique which allow applications in numerous fields including physics, chemistry, diverse engineering, and reinforced composite structures [2, 3].
They assumed that CNTs, when subjected to loading, behave like space-frame structures.
In addition, they investigated the dependence of the mechanical properties on the number of nanotubes in multi-walled structures.
Their results indicated that the layered structure can increase the shear stress concentration.
Zhang, Molecular dynamic study of effects of Si-doping upon structure and mechanical properties of carbon nanotubes, Commun.

SEM, TEM and XRD were employed to investigate the micro-structure of obtained specimens.
Transmission electron microcopy (TEM) with the type of FEI Tecnai T20 (FEI, Eindhoven, Netherlands) was employed to observe the fine morphologies and characterize the crystal structure of the specimens.
While for the nanowires derived from the grey-green specimens, SiC/SiO2 coaxial structure was obtained due to the surface oxidation.
Zou: Chinese Journal of Inorganic Chemistry, Vol.25 (2009) No.6, p.1026-1030

We think the reason maybe the structure.Dihydroflavonols and flavan-3-ol have similar structure, dihydromyricetin, as an dihydroflavonols, has similar structure to flavan-3-ol, and flavan-3-ol derivatives are potential ligands for etomidate/loreclezole-related binding sites at GABA(A) receptors and the low-affinity effects of diazepam are mediated via the same site.
(Fig.1) It is well konw that ester hydrolysis easily, 3-ester becomes 3-hydroxyl, this structure exists in dihydromyricetin, don’t exist in quercetin.
Dihydromyricetin lacks one double bond contrast to quercet in, so the atoms of the ring is not a flat surface, maybe this is one important structure for alcohlism by GABA. 3-Hydroxy-2'-methoxy-6-methylflavone was a potent anxiolytic with a unique selectivity profile at GABA(A) receptor subtypes, also had hydroxy in 3 site.
flavonoids flavan-3-ol dihydromyricetin dihydroflavonols quercetin Figure 1 Structure of flavonoids, flavan-3-ol, dihydroflavonols, dihydromyricetin, quercetin Acknowledgment None declared.
Journal of agricultural and food chemistry, 2011, 59(4): 1138-1144

Introduction MWCNT are known as promising adsorbent to adsorb CO2 because of the unique characteristics of MWCNT like having good chemical, mechanical, electrical [1], and thermal properties [2] together with the nanoscale structure (high surface area and high porosity) [3].
C=C stretching was found at the wavelength of 1458.33 cm-1 indicates the presence of carbon structure and the back bone of adsorbent [8].
D band is related to the presence of defects in the graphitic structure of MWCNT and the peak is located at ~ 1320cm-1 and the G band that located at the peak of ~1580 is represent the graphitic structure of the material.
When the value of the ratio is high, it pictures the condition of nanotubes that have high defects in the graphitic structure as well.
Arepalli, "Effect of mild nitric acid oxidation on dispersability, size, and structure of single-walled carbon nanotubes," Chemistry of Materials, vol. 19, pp. 5765-5772, 2007.

., Klong 1, Klong Luang, Pathumthani 12120, Thailand. 3Department of Chemistry, Faculty of Science, Mahidol University, Rama 6 Rd., Bangkok, 10400, Thailand. 4Research and Development Centre for Thai Rubber Industry (RDCTRI), Faculty of Science, Mahidol University, Salaya Campus, Phutthamonthon 4 Rd., Salaya, Nakhon Pathom, 73170, Thailand.
Fourier transform infrared (FTIR, Bruker Equinox55) spectroscopy and Silicon solid stated nuclear magnetic resonance (29Si-NMR, Bruker Biospin DPX-300) were utilized for monitoring the change in the chemical structure of PSi after modification.
In the case of modified PSi with different active chain end of SCAs (Figure 2 a, b and c), the chemical shifts are observed in the range of – 45 to – 70 ppm, corresponding to mono dentate, (T1), bidentate, (T2), and tridentate structure, (T3), which imply the differences in the structure of the silanes on PSi surfaces.
The peak denoted T3 as the tridentate structure corresponds to silane molecules with all 3 –OH groups reacted with other hydroxyl groups.
Similarly, the peak T2 as bidentate structure represents the silane molecules with one unreacted hydroxyl group while the peak T1 as monodentate structure represents the silane with two unreacted hydroxyl groups.

An interesting aspect of the crystal chemistry of the NZP structure is its flexibility toward ionic substitutions at different lattice sites leading to numerous chemical compositions.
Due to its flexibility to accommodate almost the whole periodic table, NZP structure has proved to be an excellent host to immobilize almost all 42 elements present in commercial nuclear wastes and still maintains its structural integrity [5].
The crystal structure of NaZr2(PO4) 3 was first solved for the NaZr2(PO4) 3 composition and the titanium and germanium analogues in 1968 by Hagman and Kierkegaard [6].
The crystal structure of these compounds can be described as a network comprising corner-sharing PO4 tetrahedra and ZrO6 octahedra.
It is shown that there are no significant changes in the Raman spectra of the samples with increasing temperature, indicating that they maintain orthorhombic structure and do not have phase transitions at this temperature range.

., Ivanovo, 153000, Russian Federation 2Ivanovo State Polytechnic University, department of nanotechnologies, physics and chemistry, 21, Sheremetevsky av., Ivanovo, 153000, Russian Federation afedosov-academic53@mail.ru, bvarrym@gmail.com, ckotprotiv@yandex.ru, dborisfablee@gmail.com Keywords: strength properties of materials, composite reinforcement, winding, concrete corrosion, adhesion.
Reinforcement of concrete structures with non-metallic composite reinforcement has recently received much attention [4-7].
In places of chipping and splitting of concrete, the calculated cross-section may be without reinforcement, and, consequently, be turned off from the work of the structure, which will lead to an emergency situation.
Mailyan, Composite materials – as the basis of performance in the construction and renovation of buildings and structures, Engineering journal of Don. 4-2 (2012) 162
Krasinikova, Strength and deformability of concrete structures reinforced with fibre-reinforced polymer bars, Magazine of Civil Engineering. 2 (2016) 32-41