scholarly journals Gravimetric and differential thermal analysis and activation energy Studies of unsaturated polyester using date seeds powder and walnut shells

2019 ◽  
Vol 10 (4) ◽  
pp. 3811-3821
Author(s):  
Ebtehag Z. Sulyman ◽  
Amel G. Abed ◽  
Abeer Q. Younis
Keyword(s):  
Activation Energy ◽  
Thermal Analysis ◽  
Polyester Resin ◽  
Unsaturated Polyester ◽  
Weight Ratio ◽  
Processing Temperature ◽  
Walnut Shells ◽  
Before And After ◽  
Polyester Composites ◽  
Date Seeds Powder

The effect of date seeds powder and walnut shells powder on the thermal properties of unsaturated polyester resin was studied after reinforcement with different weight ratios of date seeds and walnut shells powder (1%, 3%, 5%, 7%, 9%), The thermodynamic properties of polyester before and after reinforcement were studied, comparing values ​​of  (Wt%)360 with IDT and CDT values, we found that these values ​​were consistent with CDT and IDT values ​​for all supported polyester composites. The highest percentage for polyester with walnut shells powder (UP + WSP), with Treatment temperatures (24,53°C) did not affect the values ​​of IDT and CDT, while some values ​​increased and some decreased by increasing the processing temperature, where the values ​(Wt%)360, IDT, CDT), ​​increase by increasing the weight ratios of the supported materials for poly ester while the others decreased by increasing the weight ratio. The activation energy was calculated using the Foz equation , E = RTi2 / Wi (dwi/ dTi). The activation energy values ​​of the treated polymer composites at 24°C were often found to be higher than that at 53°C. The activation energy of the date seeds powder -supported polyester was higher than the polyester supported by walnut shells powder and that reinforced by walnut shells and date seeds powder together.

scholarly journals Synthesis, Characterization and Testing of Antimicrobial Activity of Composites of Unsaturated Polyester Resins with Wood Flour and Silver Nanoparticles

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1122
Author(s):  
Przemysław Pączkowski ◽  
Andrzej Puszka ◽  
Malgorzata Miazga-Karska ◽  
Grażyna Ginalska ◽  
Barbara Gawdzik
Keyword(s):  
Silver Nanoparticles ◽  
Staphylococcus Epidermidis ◽  
Polyester Resin ◽  
Wood Flour ◽  
Unsaturated Polyester ◽  
Thermomechanical Properties ◽  
Resin Composites ◽  
Polyester Resins ◽  
Before And After

This paper presents the properties of the wood-resin composites. For improving their antibacterial character, silver nanoparticles were incorporated into their structures. The properties of the obtained materials were analyzed in vitro for their anti-biofilm potency in contact with aerobic Gram-positive Staphylococcus aureus and Staphylococcus epidermidis; and aerobic Gram-negative Escherichia coli and Pseudomonas aeruginosa. These pathogens are responsible for various infections, including those associated with healthcare. The effect of silver nanoparticles incorporation on mechanical and thermomechanical properties as well as gloss were investigated for the samples of composites before and after accelerating aging tests. The results show that bacteria can colonize in various wrinkles and cracks on the composites with wood flour but also the surface of the cross-linked unsaturated polyester resin. The addition of nanosilver causes the death of bacteria. It also positively influences mechanical and thermomechanical properties as well as gloss of the resin.

Manufacture of Sheets Using Post-Consumer Unsaturated Polyester Resin/Glass Fibre Composites

2002 ◽  
Vol 18 (2) ◽  
pp. 111-125 ◽  
Author(s):  
A. G. Pedroso ◽  
D. S. Rosa ◽  
T. D. Z. Atvars
Keyword(s):  
Glass Fibre ◽  
Polyester Resin ◽  
Unsaturated Polyester ◽  
Impact Resistance ◽  
Weight Ratio ◽  
High Volume ◽  
Volume Weight ◽  
Fibre Composites ◽  
Powdered Composite ◽  
Resin Curing

The storage of post-consumer unsaturated polyester/glass fibre composites impacts negatively on the environment due to its persistence (long lifetime of both the glass fibre and the resin) as well as the high volume/weight ratio of the residues. In this work we introduce a new approach for the recycling process of artefacts made of these polyester/glass fibre composites that involves the dispersion of the ground, not powdered, composite in raw polyester resin. Room temperature resin curing was employed. Flexural and impact tests were performed to optimize the processing conditions and the manufacturing process. Significant improvement in texture, flexural strength and impact resistance of sheets were achieved by pressing and heating the sheets at 40∞C and 50∞C during curing. The artefacts utilized in our work were post-consumer public telephone weather protector caps, which, in Brazil, are manufactured with a composite of unsaturated polyester/glass fibre. Although we used this specific artefact, the methodology can be extended to different types of post-consumer materials or industrial scraps.

scholarly journals Biodegradation Study of Nanocomposites of Phenol Novolac Epoxy/Unsaturated Polyester Resin/Egg Shell Nanoparticles Using Natural Polymers

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
S. M. Mousavi ◽  
H. Esmaeili ◽  
O. Arjmand ◽  
Sh. Karimi ◽  
S. A. Hashemi
Keyword(s):  
Polyester Resin ◽  
Unsaturated Polyester ◽  
Unsaturated Polyester Resin ◽  
Hydroxyl Group ◽  
Natural Polymers ◽  
Shell Nanoparticles ◽  
Before And After ◽  
Biodegradation Study ◽  
Egg Shell ◽  
Novolac Epoxy

Nanocomposite materials refer to those materials whose reinforcing phase has dimensions on a scale from one to one hundred nanometers. In this study, the nanocomposite biodegradation of the phenol Novolac epoxy and the unsaturated polyester resins was investigated using the egg shell nanoparticle as bioceramic as well as starch and glycerin as natural polymers to modify their properties. The phenol Novolac epoxy resin has a good compatibility with the unsaturated polyester resin. The prepared samples with different composition of materials for specified time were buried under soil and their biodegradation was studied using FTIR and SEM. The FTIR results before and after degradation showed that the presence of the hydroxyl group increased the samples degradation. Also adding the egg shell nanoparticle to samples had a positive effect on its degradation. The SEM results with and without the egg shell nanoparticle also showed that use of the egg shell nanoparticle increases the samples degradation. Additionally, increasing the amount of starch, and glycerol and the presence of egg shell nanoparticles can increase water adsorption.

scholarly journals PENGARUH BAHAN PENGISI SILIKA DAN SERBUK TANDAN KOSONG SAWIT (STKS) TERMODIFIKASI TERHADAP KEKUATAN BENTUR DAN DAYA SERAP AIR KOMPOSIT HIBRID POLIESTER TIDAK JENUH

2016 ◽  
Vol 5 (2) ◽  
pp. 32-37
Author(s):  
Halimatuddahliana ◽  
Johan Evander Sirait ◽  
Fermadi Sirait
Keyword(s):  
Impact Strength ◽  
Chemical Modification ◽  
Water Adsorption ◽  
Impact Test ◽  
Polyester Resin ◽  
Unsaturated Polyester ◽  
Weight Ratio ◽  
Empty Fruit Bunches ◽  
The Matrix ◽  
Method Analysis

This research aims to determine the effect of palm oil empty fruit bunches (POEFB) powder and silica into the matrix of unsaturated polyester resin (UPR) and the influence of chemical modification OPEFB with using acetic acid 50% (v / v). In this study, (UPR) was mixed with silica and OPEFB to weight ratio (UPR: Silica: OPEFB) 80: 20: 0, 80: 15: 5, 80: 10: 10, 80: 5: 15, 80: 0: 20 by hand lay-up method. Analysis was done by impact test, and analysis of scanning electron microscopy (SEM). Results showed that impact strength at a ratio of 80: 5: 15 was higher than those without modification viz. 3622.5 J / m2. In this case the chemical modification has lowered OPEFB polarity so that the interfacial tencion between the filler with a matrix became low resulting in good interfacial interaction and adhesion between matrix and fille. Impact strength values ​​were supported by the results of SEM. From water adsorption test, composite with chemical modification showed low values as compared without modification indicating that modification has lowered the polarity of OPEFB.

scholarly journals Microwave Power Absorption Evaluation of River Shell Particles Reinforced Polyester Composite

2019 ◽  
Vol 64 (2) ◽  
pp. 192-199
Author(s):  
Isam Salah Hameed ◽  
Hamid M. Mahan ◽  
Ahmed Salah Hameed
Keyword(s):  
Particle Size ◽  
Microwave Power ◽  
Polyester Resin ◽  
Unsaturated Polyester ◽  
Unsaturated Polyester Resin ◽  
Absorption Properties ◽  
Power Absorption ◽  
Band Frequency ◽  
Polyester Composites ◽  
Shell Powder

The objective of this research is to analyze the microwave power absorption properties of Unsaturated Polyester Resin (UPR) composite reinforced with micro size river-shell with an aim to figure out the new formed composites with the best microwave power absorption scenario. The composites were prepared by using river shell powder in micro-particle size as a filler material with unsaturated polyester composites. Using free-space transmission technique and within the x-band frequency range, the microwave power absorption properties were studied with varied percentages of river shell powder being loaded into the unsaturated polyester composites. River shells were introduced in an 50 microns particle size powder which was mixed in different weight percentages of 5, 10, and 15 % of a 12 cm square shape side length composite sample along with a thickness of 4 mm for each sample. The test specimens were prepared using the pre-mentioned weight amounts after mixing them with the Unsaturated Polyester Resin (UPR) compositions and in accordance with ASTM standard. Number of teste samples are four represented by pure, 5 %, 10 %, and 15 % of river-shell reinforced polyester composites. It has been found that the 5 % is the case when maximum power absorption presents higher levels than other loading percentages. Therefore, such kind of composites can be established under focus in those applications at which their trends is about necessity and importance of microwave power absorption.

Ceramifying Fire-Retardant and Fire-Barrier Unsaturated Polyester Composites

2010 ◽  
Vol 123-125 ◽  
pp. 23-26 ◽  
Author(s):  
Robert A. Shanks ◽  
Susan Wong ◽  
Christopher M.L. Preston
Keyword(s):  
Thermal Degradation ◽  
Polymer Composite ◽  
Polyester Resin ◽  
Unsaturated Polyester ◽  
Fire Retardant ◽  
Fire Retardants ◽  
Barrier Performance ◽  
Inorganic Fillers ◽  
Polyester Composites ◽  
Fire Barrier

Fire-barrier performance is an important property where the polymer composite can continue to provide a barrier to spread of fire after the polymer has burned. In this work a barrier is created by formation of a self-supporting ceramic from the inorganic fillers, over a temperature range where the polymer undergoes thermal degradation. Thermogravimetry showed that degradation of the unsaturated polyester resin left a residual char that subsequently degraded in parrale with reactions of the fire-retardants and ceramifying flux.

scholarly journals Numerical Analysis of the Mechanical Properties of Rice Husk-Polyester Composites

2002 ◽  
Vol 11 (4) ◽  
pp. 096369350201100
Author(s):  
R. Salgado-Delgado ◽  
S. Vasquez ◽  
E. Garcia ◽  
R. Lopez-Castanares ◽  
A. Alvarez-Castillo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Numerical Analysis ◽  
Rice Husk ◽  
Polyester Resin ◽  
Unsaturated Polyester ◽  
Correlation Equation ◽  
Unsaturated Polyester Resin ◽  
Polyester Composites

The production of hot-pressed composite materials based on unsaturated polyester resin reinforced with rice husk is described. A correlation equation relating the tensile and compressive mechanical properties as a function of both rice husk concentration and the pressure applied to the mold was obtained.

scholarly journals Tensile Studies on Random Oriented Human Hair Fiber Reinforced Polyester Composites

2018 ◽  
Vol 47 (1) ◽  
pp. 37-44 ◽  
Author(s):  
P. Divakara Rao ◽  
C. Udaya Kiran ◽  
K. Eshwara Prasad
Keyword(s):  
Experimental Study ◽  
Tensile Strength ◽  
Human Hair ◽  
Fiber Length ◽  
Polyester Resin ◽  
Weight Ratio ◽  
Tensile Modulus ◽  
Theoretical Models ◽  
Hair Fiber ◽  
Polyester Composites

Composite specimens are prepared by impregnating human hair in polyester resin. Randomlyoriented chopped Human hair with varied weight ratios and Fiber lengths are used for the present experimental study. The composites are compression moulded using hand layup technique. An attempt is made to find out the influence of fiber weight ratio and length on the Tensile strength and tensile modulus. Optimum Fiber weight ratio and Fiber length are identified for maximizing the tensile strength and tensile modulus of the Human hair polyester composites. Experiments are carried out as per the standards and results are discussed.Further, Tensile stress and Tensile Modulus of the composite at optimum fiber length are estimated using different theoretical models and are compared with the experimental results.

Sign in / Sign up

Export Citation Format

Share Document