scholarly journals Effect of water absorption on some mechanical and physical properties of epoxy/polyurethane blend reinforced with nano silica powder

2019 ◽  
Vol 15 (32) ◽  
pp. 92-98
Author(s):  
Rana M. Salih
Keyword(s):  
Thermal Conductivity ◽  
Diffusion Coefficient ◽  
Impact Strength ◽  
Flexural Strength ◽  
Physical Properties ◽  
Nano Silica ◽  
Silica Powder ◽  
Mechanical And Physical Properties ◽  
The Impact ◽  
And Diffusion

The aim of this work is to evaluate some mechanical and physicalproperties (i.e. the impact strength, hardness, flexural strength,thermal conductivity and diffusion coefficient) of(epoxy/polyurethane) blend reinforced with nano silica powder (2%wt.). Hand lay-up technique was used to manufacture the compositeand a magnetic stirrer for blending the components. Results showedthat water had affected the bending flexural strength and hardness,while impact strength increased and thermal conductivity decreased.In addition to the above mentioned tests, the diffusion coefficientwas calculated using Fick’s 2nd law.

scholarly journals Thermal and Natural Particles Addition Effects on the Mechanical and Physical Properties of Epoxy–Polyurethane Resin Blend Polymer

2018 ◽  
Vol 3 (8) ◽  
pp. 1
Author(s):  
Aseel Kais Rasheed ◽  
Noor Kais Rasheed ◽  
Ismail Ibrahim Marhoon
Keyword(s):  
Thermal Conductivity ◽  
Impact Strength ◽  
Physical Properties ◽  
Volume Fraction ◽  
Resin Composite ◽  
Weight Ratio ◽  
Polymer Resin ◽  
Mechanical And Physical Properties ◽  
The Impact ◽  
Blend Polymer

In this study, natural particles were added to blend polymer resin. Composite material prepared from pistachio shells was added to epoxy–polyurethane blend polymer. The weight ratio of additive for liquid polyurethane to epoxy was 12 wt.%. In addition, their mechanical and physical properties were studied depending on a range of variables, such as temperature (25 °C, 35 °C, 45 °C and 55 °C) and volume fraction (3%, 6%, 9% and 12%). Hardness, impact strength and thermal conductivity were studied. Results showed that the impact strength was increased and that the hardness and thermal conductivity values were reduced at high temperatures. Meanwhile, the impact strength and hardness increased and the thermal conductivity values decreased with increased volume fracture of pistachio shells particles.

Physical Properties of Four Acrylic Denture Base Resisns

2005 ◽  
Vol 6 (4) ◽  
pp. 93-100 ◽  
Author(s):  
Thomas R. Meng ◽  
Mark A. Latta
Keyword(s):  
Impact Strength ◽  
Flexural Strength ◽  
Physical Properties ◽  
Flexural Modulus ◽  
Heat Processing ◽  
Denture Base ◽  
Test Fixture ◽  
Izod Impact Strength ◽  
Izod Impact ◽  
The Impact

Abstract Resistance to impact fracture and high flexural strength are desirable properties of denture base acrylics. The purpose of this laboratory study was to determine the Izod impact strength, the flexural strength, the flexural modulus, and the yield distance for four premium denture resins. Bar specimens 86 x 11 x 3 mm of Lucitone 199, Fricke Hi-I, ProBase Hot, and Sledgehammer Maxipack were fabricated following the manufacturer's instructions for heat processing. The bars were surface finished using silicon carbide paper to 600 grit. Ten specimens from three lots of each material were made (n=30). Flexural strength, flexural modulus, and yield distance were determined by testing the specimens to failure using a three-point test fixture. Izod impact strength was determined using an Izod tester on un-notched specimens generated from the flexural test (n=60). Analysis of variance (ANOVA) and post-hoc Tukey's test were used for statistical comparison of each property. There were significant differences in the physical properties among the denture acrylics tested. Lucitone 199 demonstrated the highest impact strength, flexural strength, and yield distance (p<0.05). Lucitone 199 with an Izod impact strength of 5.5 ± 1.2 N·m, a flexural strength of 99.5 ± 4.5 MPa, and yield distance of 9.9 ± 0.76 mm exhibited statistically greater results than Fricki Hi-I, ProBase Hot, and Sledgehammer Maxipack. Fricki Hi- I with a yield distance of 7.3 ± 1.1 mm was statically greater than ProBase Hot and Sledgehammer Maxipack. Fricki Hi-I, ProBase Hot, and Sledgehammer Maxipack were statistically similar for the Izod impact strength and flexural strength tests performed. ProBase Hot and Sledgehammer Maxipack yielded statistically similar results for all tests performed. Flexural modulus had an inverse relationship to the impact strength, flexural strength, and yield distance. Citation Meng TR, Latta MA. Physical Properties of Four Acrylic Denture Base Resins. J Contemp Dent Pract 2005 November;(6)4:093-100.

scholarly journals The effect of adding natural wastes on some properties of gypsum: تأثير إضافة المخلفات الطبيعية على بعض خواص الجبس

2021 ◽  
Vol 5 (5) ◽  
pp. 77-65
Author(s):  
Alaa Ahmad Zohir Kattan, Nada Altonji, Fatima Alsaleh Alaa Ahmad Zohir Kattan, Nada Altonji, Fatima Alsaleh
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Flexural Strength ◽  
Physical Properties ◽  
Thermal Insulation ◽  
Building Materials ◽  
Reference Sample ◽  
Basic Material ◽  
Mechanical And Physical Properties ◽  
Peanut Shells

In this research, the effect of adding some natural wastes to gypsum was studied in order to use them as thermal insulation materials in buildings and to recycle these wastes. Thermal insulation panels were installed from gypsum (as a basic material) and natural wastes (sawdust, peanut shells, wheat straw, cottonwood) at percentages (10, 15, 20) %, and some of their mechanical and physical properties, and their thermal conductivity were studied. The results indicated an improvement in some properties of gypsum after adding wastes, and obtaining thermal building materials that have better properties than the reference sample (gypsum) in some cases. Rough sawdust samples (SdR15, SdR20) achieved the highest compressive strength exceeding (4MPa). The flexural strength was for peanut shells samples (P10:1.76 MPa, P15:1.8 MPa), while the most efficient samples as thermal insulation were ground straw and smooth sawdust samples (SdS15, SdS20, GSt15, GSt20) where their thermal conductivity was (0.194-0.141W/m.K), which makes it acceptable according to the Syrian thermal insulation code.

A novel recycled polyethylene terephthalate/polyamide 11 (rPET/PA11) thermoplastic blend

2021 ◽  
pp. 147776062110010
Author(s):  
Zahid Iqbal Khan ◽  
Zurina Binti Mohamad ◽  
Abdul Razak Bin Rahmat ◽  
Unsia Habib ◽  
Nur Amira Sahirah Binti Abdullah
Keyword(s):  
Mechanical Properties ◽  
Impact Strength ◽  
Flexural Strength ◽  
Polyethylene Terephthalate ◽  
Practical Implication ◽  
Polyamide 11 ◽  
Recycled Polyethylene ◽  
Twin Screw ◽  
Electron Microscopy Analysis ◽  
The Impact

This work explores a novel blend of recycled polyethylene terephthalate/polyamide 11 (rPET/PA11). The blend of rPET/PA11 was introduced to enhance the mechanical properties of rPET at various ratios. The work’s main advantage was to utilize rPET in thermoplastic form for various applications. Three different ratios, i.e. 10, 20 and 30 wt.% of PA11 blend samples, were prepared using a twin-screw extruder and injection moulding machine. The mechanical properties were examined in terms of tensile, flexural and impact strength. The tensile strength of rPET was improved more than 50%, while the increase in tensile strain was observed 42.5% with the addition of 20 wt.% of PA11. The improved properties of the blend were also confirmed by the flexural strength of the blends. The flexural strength was increased from 27.9 MPa to 48 MPa with the addition of 30 wt.% PA11. The flexural strain of rPET was found to be 1.1%. However, with the addition of 10, 20 and 30 wt.% of PA11, the flexural strain was noticed as 1.7, 2.1, and 3.9% respectively. The impact strength of rPET/PA11 at 20 wt.% PA11 was upsurged from 110.53 to 147.12 J/m. Scanning electron microscopy analysis revealed a dispersed PA11 domain in a continuous rPET matrix morphology of the blends. This work practical implication would lead to utilization of rPET in automobile, packaging, and various industries.

scholarly journals Comparison of Dental Stone Models and Their 3D Printed Acrylic Replicas for the Accuracy and Mechanical Properties

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4066
Author(s):  
Marta Czajkowska ◽  
Ewa Walejewska ◽  
Łukasz Zadrożny ◽  
Monika Wieczorek ◽  
Wojciech Święszkowski ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Impact Strength ◽  
Physical Properties ◽  
Diagnostic Tool ◽  
Medical Records ◽  
Diagnostic Value ◽  
Dental Models ◽  
3D Printed ◽  
The Impact

This study was conducted to test possibilities of application of 3D printed dental models (DMs) in terms of their accuracy and physical properties. In this work, stone models of mandibles were cast from alginate impressions of 10 patients and scanned in order to obtain 3D printed acrylic replicas. The diagnostic value was tested as matching of model scans on three levels: peak of cusps, occlusal surface, and all teeth surfaces. The mechanical properties of acrylic and stone samples, specifically the impact strength, shore D hardness, and flexural and compressive strength were investigated according to ISO standards. The matching of models’ surfaces was the highest on the level of peaks of cusps (average lack of deviations, 0.21 mm) and the lowest on the level of all teeth surfaces (average lack of deviations, 0.64 mm). Acrylic samples subjected to mechanical testing, as expected, showed higher mechanical properties as compared to the specimens made of dental stone. In the present study we demonstrated that 3D printed acrylic models could be ideal representatives in the case of use as a diagnostic tool and as a part of medical records. The acrylic samples exhibited not only higher mechanical properties, but also showed better accuracy comparing to dental stone.

scholarly journals Cyanate ester resin based composites with high toughness and thermal conductivity

RSC Advances ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 5722-5730 ◽  
Author(s):  
Le Zhai ◽  
Zhenxin Liu ◽  
Chen Li ◽  
Xiongwei Qu ◽  
Qingxin Zhang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Impact Strength ◽  
Cyanate Ester ◽  
Core Shell ◽  
Microelectronic Packaging ◽  
Cyanate Ester Resin ◽  
High Toughness ◽  
The Impact

h-BN particles were used to fabricate cyanate ester/core–shell structured polyacrylic/BN composites. The impact strength and the thermal conductivity of the composites were simultaneously increased, which may be used in microelectronic packaging.

Preparing of SMC Artificial Marble and its Mechanical Properties

2011 ◽  
Vol 55-57 ◽  
pp. 447-450 ◽  
Author(s):  
Jian Li ◽  
Zheng Qun Huang ◽  
Yan Qin
Keyword(s):  
Mechanical Properties ◽  
Impact Strength ◽  
Flexural Strength ◽  
Fiber Length ◽  
Filler Content ◽  
Fiber Content ◽  
Molding Temperature ◽  
Overall Performance ◽  
The Impact

In this article, a kind of SMC artificial marble was prepared. In order to enhance the mechanical properties and prolong the using life of SMC artificial marble, some effects such as fiber content, filler content and molding temperature etc. on the mechanical properties were carefully studied, too. Results showed that the increase of fiber content could improve the impact strength of SMC artificial marble when the fiber length was 10mm and the increase of filler content would decrease the flexural strength of SMC artificial marble. And the molding temperature at the range of 130°C ~ 160°C had little influence on the mechanical properties of SMC artificial marble. Comparing with natural marble and casting marble, SMC artificial marble owed superior overall performance and it was much more suitable for industry production.

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