Effects of Aluminum Oxide on Combustion Behavior of Intumescent Fire-Retarded Polypropylene Composites

2011 ◽  
Vol 120 ◽  
pp. 598-602
Author(s):  
Shan Hu ◽  
Hui Jing ◽  
Jun Zhang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Aluminum Oxide ◽  
Oxygen Index ◽  
Al2o3 Content ◽  
Reaction Products ◽  
Limiting Oxygen Index ◽  
Polypropylene Composites ◽  
Melamine Phosphate ◽  
Scanning Electron

The melamine phosphate (MP) was synthesized from melamine and phosphate acid. Aluminum oxide (Al2O3) was added into the MP during its synthesis. Fourier transform infrared spectroscopy (FTIR) was used to characterize the reaction products. The composites were prepared from polypropylene (PP) and intumescent flame retardant (IFR) additives of MP and pentaerythritol (PER). The effect of Al2O3 content on the properties of the composites was investigated by the limiting oxygen index (LOI), thermogravimetry (TG) and scanning electron microscopy (SEM). The results indicated that the LOI value of the composites could be enhanced obviously with suitable content of Al2O3. When the Al2O3 content was 6 wt% in MP, the LOI value increased to 35.5% from 31.0% for the composite without Al2O3, the amount of residual char at 600°C increased from 8.9 wt% to 13.9 wt%.

Synergistic Effects of Zinc Oxide on Intumescent Flame-Retarded Polypropylene Composites

2010 ◽  
Vol 178 ◽  
pp. 279-284 ◽  
Author(s):  
Shan Hu ◽  
Hui Zheng ◽  
Shang Yue Shen ◽  
Hong Chang Han ◽  
Hui Jing ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Oxygen Index ◽  
Synergistic Effects ◽  
Synthesis Process ◽  
Reaction Products ◽  
Limiting Oxygen Index ◽  
Polypropylene Composites ◽  
Melamine Phosphate ◽  
Flame Retarded ◽  
Synergistic Agent

The melamine phosphate (MP) was synthesized from melamine and phosphate acid. Zinc oxide (ZnO) was used as a synergistic agent by adding into the MP during the synthesis process. The reaction products were characterized by Fourier transform infrared spectroscopy (FTIR). The properties of polypropylene (PP) composites containing intumescent flame retardant (IFR) additives of melamine phosphate and pentaerythritol (PER) were investigated by the limiting oxygen index (LOI), UL-94 vertical burning test, thermogravimetric analysis (TG) and scanning electron microscopy (SEM). The results indicated that the LOI value of the composites could be enhanced obviously with suitable content of ZnO. When the ZnO content was 6 wt% in MP, the LOI value reached 34.1%, which showed 10% higher than that of the composites without ZnO.

Tensile and flammability characterizations of corn straw slagging/high-density polyethylene composites

2019 ◽  
Vol 33 (11) ◽  
pp. 1466-1477
Author(s):  
Qingfa Zhang ◽  
Wenyu Lu ◽  
Liang Zhou ◽  
Donghong Zhang ◽  
Hongzhen Cai ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Tensile Strength ◽  
Flame Retardant ◽  
High Density Polyethylene ◽  
Oxygen Index ◽  
High Density ◽  
Corn Straw ◽  
Scanning Calorimetry ◽  
Scanning Electron

Biocomposites were prepared with corn straw slagging (CSS) and high-density polyethylene (HDPE) at four loading levels (10, 20, 30, and 40 wt%) by extrusion method. CSS/HDPE composites were tested by tension, oxygen index meter, differential scanning calorimetry, X-ray diffraction, and the scanning electron microscopy. The scanning electron microscopy showed that CSS was dispersed uniformly in the HDPE matrix and strong interfacial interaction was achieved, which had an important influence on the tensile strength of the composites. The tensile strength of the composites could be improved with proper increase of CSS and reached maximum value at 30 wt% content. Furthermore, the addition of CSS played an important role in improving the flame-retardant ability of CSS/HDPE composites, and the limited oxygen index was 31.26% at 40 wt% content, good flame-retardant effect achieved.

scholarly journals Measurement of aluminum oxide film by Fabry–Pérot interferometry and scanning electron microscopy

2017 ◽  
Vol 21 (8) ◽  
pp. 938-942
Author(s):  
Farzia Karim ◽  
Tanujjal Bora ◽  
Mayur Chaudhari ◽  
Khaled Habib ◽  
Waleed Mohammed ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Oxide Film ◽  
Aluminum Oxide ◽  
Aluminum Oxide Film ◽  
Fabry Perot ◽  
Scanning Electron

Charge dynamics in aluminum oxide thin film studied by ultrafast scanning electron microscopy

2018 ◽  
Vol 187 ◽  
pp. 93-97 ◽  
Author(s):  
Maurizio Zani ◽  
Vittorio Sala ◽  
Gabriele Irde ◽  
Silvia Maria Pietralunga ◽  
Cristian Manzoni ◽  
...  
Keyword(s):  
Thin Film ◽  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Aluminum Oxide ◽  
Oxide Thin Film ◽  
Charge Dynamics ◽  
Scanning Electron

Analysis of the Y-TZP Ceramic Substucture in Blasting with Aluminum Oxide before and after Sintering

2014 ◽  
Vol 805 ◽  
pp. 576-580
Author(s):  
C.L. Melo-Silva ◽  
C.F. Carvalho ◽  
T.C.F. Melo-Silva ◽  
R.X. Freitas ◽  
F.R.F. Silva ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Aluminum Oxide ◽  
Good Alternative ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Resin Cements ◽  
Before And After ◽  
Scanning Electron ◽  
Group 1

The objective of this study was to evaluate the microstructure of a ceramic based on yttria stabilized zirconia (Y-TZP) in blasting with aluminum oxide and its effect on the sintering. 25 pre-sintered Y-TZP blocks were obtained. Ten samples were blasted with alumina, and then all samples were sintered and divided into the groups: Control-no treatment; alumina G1-blasted with alumina and sintered; alumina and Rocatec G1-blasted, sintered, and Rocatec; alumina G2-sintered, alumina blasting; alumina and Rocatec G2-sintering, alumina blasting, and Rocatec. The samples were evaluated by a scanning electron microscopy. The qualitative analysis showed that the treated samples had an increase in the surface texture and that group 1– alumina and Rocatec– presented the silica incorporation to be regular and homogeneous. It was concluded that the treatment of pre-sintered surfaces is a good alternative in the bonding strength between the Y-TZP and the resin cements.

Prognosis of Alkali Aggregate Reaction with SEM

2011 ◽  
Vol 194-196 ◽  
pp. 1012-1016
Author(s):  
Xin Yu Zhang ◽  
Emmanuel Gallucci ◽  
Karen Scrivener
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Compressive Strength ◽  
Energy Dispersive Spectroscopy ◽  
Reaction Products ◽  
Alkali Aggregate Reaction ◽  
Damage In Concrete ◽  
Backscattered Scanning Electron Microscopy ◽  
Great Damage ◽  
Scanning Electron

Alkali aggregate reaction (AAR) is known leading to great damage in concrete, both in compressive strength and in durability. In this study, a backscattered scanning electron microscopy with energy dispersive spectroscopy is adopted to diagnose AAR reaction. The results show that the type of AAR reaction and reaction products can be easily identified and the method is precise and fast.

Characterization of ceramic/TA6V titanium alloy brazed joints

1990 ◽  
Vol 5 (1) ◽  
pp. 127-135 ◽  
Author(s):  
C. Peytour ◽  
F. Barbier ◽  
A. Revcolevschi
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Titanium Alloy ◽  
Electron Probe ◽  
Braze Alloy ◽  
Reaction Products ◽  
Brazed Joints ◽  
Scanning Electron

Al2O3 and Si3N4 ceramics were joined to titanium alloy (TA6V) and niobium by active brazing. Chemical reactions between the Cu-40Ag-5Ti braze alloy and these materials were examined, and interfacial reaction products were characterized by scanning electron microscopy and electron probe microanalysis. Results indicate the importance of studying the microstructural features of the joints in order to understand better their effect on the mechanical properties of the interface.

scholarly journals The Development of Nanoalumina-Based Cement Mortars for Overlay Applications in Concrete Floors

Materials ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 3465 ◽  
Author(s):  
Szymanowski ◽  
Sadowski
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Tensile Strength ◽  
Aluminum Oxide ◽  
Functional Properties ◽  
Abrasion Resistance ◽  
Cement Mortar ◽  
Cement Mortars ◽  
Positive Effect ◽  
Scanning Electron

This article focuses on the development of nanoalumina-based cement mortars for overlay applications in concrete floors. It focuses on the effect of applying aluminum oxide (Al2O3) nanopowder to the cement mortar used to make the overlay, on the adhesion of this overlay to concrete substrate and on its functional properties. It was claimed that the addition of 0.5% of Al2O3 nanopowder has a positive effect on the adhesion of the cement mortar used to make the overlay to the substrate made of concrete. The prior studies performed using scanning electron microscopy (SEM) confirmed that the reason for the improvement in adhesion is the fact that cement mortar used to make the overlay with the addition of 0.5% of Al2O3 nanopowder is less porous than the reference mortar within the interphase. The article concurs that the most favorable results, in terms of lower abrasion resistance and higher subsurface tensile strength of the cement mortar used to make the overlay, are mainly brought about by adding 0.5% of Al2O3 nanopowder.

Sign in / Sign up

Export Citation Format

Share Document