scholarly journals Effect of Silica Composition from Rice Husk Ash on The Performace of Absorbing Electromagnetic Wave on Composite of Unsaturated Polyester Resins/Silica

2018 ◽  
Vol 19 (1) ◽  
pp. 7
Author(s):  
Rizky Fauzy ◽  
Wisnu Ari Adi ◽  
Yana Taryana ◽  
Y. Yusmaniar
Keyword(s):  
Electromagnetic Wave ◽  
Rice Husk ◽  
Electromagnetic Waves ◽  
Rice Husk Ash ◽  
Raw Materials ◽  
Unsaturated Polyester ◽  
Silica Content ◽  
X Ray Diffraction ◽  
Polyester Resins ◽  
Unsaturated Polyester Resins

This study aim is to know the effect of silica composition on the absorption of electromagnetic waves in the composite of unsaturated polyester resins (UPR)/silica. Silica raw materials have been synthesized from the results of rice husk ash extraction. The results of the analysis phase and elementary respective using X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS) show that the extraction of silica has an amorphous phase with a high purity. This silica powders are filler material acts as an electromagnetic waves absorber material and combined with the UPR as a matrix to form a composite. Silica powder varied with several compositions in this composite. The observation of scanning electron microscope (SEM) shows that the silica particles have been distributed evenly in the UPR matrix. Meanwhile the results of testing the absorption of electromagnetic waves at frequency range of 8 GHz - 12 GHz using a vector network analyzer (VNA) show that the addition of silica composition have significant effect on the absorption of electromagnetic waves. The more the silica content in the UPR matrix causes the absorption of electromagnetic waves more increasing. It was concluded that the presence of silica can improve the absorption performance of electromagnetic waves in composite UPR/silica. Keywords: rice husk ash, silica, UPR, composites, electromagnetic wave absorber

Development of Polymer Modified Rice Husk Ash Concrete (PMRHAC)

2015 ◽  
Vol 1129 ◽  
pp. 500-507
Author(s):  
Abdullah Saand ◽  
Daddan Khan Bangwar ◽  
Manthar Ali Kerio
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Energy Dispersive Spectrometer ◽  
Silica Content ◽  
Polymer Modification ◽  
X Ray Diffraction ◽  
New Approach ◽  
Polymer Powder ◽  
Optimum Proportion ◽  
Polymer Modified Concrete

The polymer modification of the concrete has been performed successfully for last more than 85 years. A number of polymer-based admixtures are being used to alter the properties of concrete to be used for repair and rehabilitation of concrete. The initiated research focuses on a new approach of development of polymer-modified concrete with appropriate replacement of cement with rice husk ash (RHA) produced by the incineration of rice husk. This paper presents the optimum possible replacement of cement with rice husk ash by not compromising on mechanical properties of concrete and addition of optimum proportion of re-dispersible polymer powder (RPP).The Energy Dispersive Spectrometer (EDS) and X-ray diffraction (XRD) were conducted to verify silica content and amorphous silica in RHA. The replacement of cement with RHA was done with 1% to 15%. The significant improvement in compressive strength with 10 % replacement of cement with RHA is obvious in the results. Further, on inclusion of various % age dosages of RPP in the optimum mix of rice husk ash concrete, the visible improvement in the strength, particularly in the tensile strength is achieved with 2.5 % (of weight of cement) inclusion of re-dispersible polymer powder.

scholarly journals Use of Dicyclopentadiene and Methyl Dicyclopentadiene for the Synthesis of Unsaturated Polyester Resins

Polymers ◽  
2021 ◽  
Vol 13 (18) ◽  
pp. 3135
Author(s):  
Alexandre Perrot ◽  
Jan Hyršl ◽  
Jan Bandžuch ◽  
Simona Waňousová ◽  
Jiří Hájek ◽  
...  
Keyword(s):  
Lower Cost ◽  
Raw Materials ◽  
Wide Spectrum ◽  
Unsaturated Polyester ◽  
Thin Layers ◽  
The Other ◽  
Polyester Resins ◽  
Unsaturated Polyester Resins ◽  
Low Concentrations ◽  
Materials Used

Dicyclopentadiene (DCPD) modified unsaturated polyester resins (UPRs) are mostly used for hulls, decks, and bathroom facilities. Main advantages of these polymers over orthophthalic or isophthalic polyesters are their relatively low shrinking, reduced styrene emission, lower cost, and fast curing in thin layers. On the other hand, once cured, these materials are more brittle and have lower glass transition temperatures and lower chemical resistance due to their different chemical constitutions. DCPD UPRs with standard grades are usually produced with high-quality DCPD (over a 85% purity) using the so-called “water process”, a synthesis consisting of two reaction steps. An adduct of maleic anhydride with DCPD is firstly formed with water, and then, it reacts with the other esterification monomers such as acids and glycols. DCPD raw materials used in this study were prepared by a unique distillation process developed by ORLEN Unipetrol and University of Chemistry and Technology, Prague. This technology allows producing a wide spectrum of DCPD quality by adjusting the content of another norbornene dimer: methyl dicyclopentadiene (MeDCPD). The influence of MeDCPD on unsaturated polyester properties was examined throughout this study. It has been discovered that in low concentrations, MeDCPD had a slight influence on flexural mechanical properties whereas its concentrations up to 65% led to a softer and brittle material. Nevertheless, by adjusting the unsaturation degree, it has been shown that MeDCPD may be successfully implanted in UPR formulation.

Synthesis of unsaturated polyester resins from non-conventional raw materials

Polimery ◽  
1995 ◽  
Vol 40 (11/12) ◽  
pp. 624-629 ◽  
Author(s):  
A.E. BATOG ◽  
B.M. TKACHUK ◽  
V.A. ALDOSHIN
Keyword(s):  
Raw Materials ◽  
Unsaturated Polyester ◽  
Polyester Resins ◽  
Unsaturated Polyester Resins

Synthesized Silica Powder from Rice Husk for Printing Raw Materials Application

2012 ◽  
Vol 506 ◽  
pp. 218-221 ◽  
Author(s):  
Nitus Tipsotnaiyana ◽  
Lerpong Jarupan ◽  
C. Pechyen
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Raw Materials ◽  
Extraction Yield ◽  
Print Quality ◽  
X Ray Diffraction ◽  
Uniform Size ◽  
Silica Sample ◽  
Silica Powder ◽  
X Ray

Rice husk is a form of agricultural biomass that provides an abundant silicon dioxides source. This study use rice husk ash as a material to prepare silica. Silica powder has been synthesized by the refluxing of rice husk ash with HCl 1,2 and 3 M at different time (60 and 120 min.) and subsequently adjusting the pH using 1 M. NaOH. The silicon dioxide extraction yield reached 85% and was effect by concentration of HCl solution and reaction time. The structure of the obtained silica powder were characterized by X-Ray Fluorescence (XRF), X-Ray diffraction (XRD), CIE L*a*b* (Visible spectrophotometer) and Scanning Electron Microscope (SEM). The highest purity of silica sample were 98.7% SiO2, CIE L*a*b* = 94.79 +0.48 +1.24, ∆E ≈ 3.28 (white power) and 2Ɵ = 22o (silica). Particle had a uniform size less than 3 μm. The objective of the next study will applied synthesized silica that enhances the print quality of the printing substrates.

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