Poly(propylene)/waste vulcanized ethylene- propylene-diene monomer (PP/WEPDM) blends prepared by high-shear thermo-kinetic mixer

2017 ◽  
Vol 50 (6) ◽  
pp. 537-553 ◽  
Author(s):  
Eren Simsek ◽  
Oguzhan Oguz ◽  
Kaan Bilge ◽  
Mehmet Kerem Citak ◽  
Oguzhan Colak ◽  
...  
Keyword(s):  
High Performance ◽  
Impact Resistance ◽  
Thermoplastic Elastomer ◽  
High Shear ◽  
Ethylene Propylene Diene Monomer ◽  
Ethylene Propylene ◽  
Blending Method ◽  
High Concentrations ◽  
The Impact ◽  
Disposal Problem

Polypropylene (PP)–waste elastomer blends are particularly attractive as an economical way of producing sustainable materials, relieving the stress on the environment. Although PP is a commodity thermoplastic finding employment in various applications, its relatively low impact strength might be a significant factor limiting the variety of uses in many industries. Extensive consumption of thermoset elastomers has been a worldwide waste disposal problem. Here, we describe a facile, economical method for reuse of waste ethylene-propylene-diene monomer (EPDM) rubber to produce impact resistant blend materials with the PP via a high-shear thermokinetic mixer. In these blends, waste EPDM was used in various concentrations ranging from 20 to 80 wt%, as the remaining part, PP acts as a carrier matrix or a physical binder depending on the concentration in the blend. Briefly, fivefold increase was achieved in the impact resistance of PP by the addition of 60 wt% EPDM waste. The blend with 80 wt% waste EPDM shows characteristics similar to a thermoplastic elastomer. The conclusion of the study is that the blending method is quite effective to produce high-performance blend materials consisting of high concentrations of thermoset waste which addresses the worldwide disposal problem of waste thermoset rubbers.

Coal Powder and Ethylene-Propylene-Diene Monomer Reinforced Hybrid Polypropylene Composites

2019 ◽  
Vol 956 ◽  
pp. 192-200
Author(s):  
Yu Feng Bai ◽  
Xin Xin Cao ◽  
Ming Lu Xu ◽  
Xiao Fang He ◽  
Guo Hui Cai
Keyword(s):  
Mechanical Properties ◽  
Contact Angle ◽  
Structural Changes ◽  
Mechanical And Thermal Properties ◽  
Ethylene Propylene Diene Monomer ◽  
Initial Decomposition Temperature ◽  
Ethylene Propylene ◽  
Blending Method ◽  
Coal Powder ◽  
The Impact

For the better mechanical and thermal properties of polypropylene (PP), PP sea-island structured composites with elastomer ethylene-propylene-diene monomer (EPDM) and coal powder were prepared by melt-blending method. Coupling agent γ-methacryloxypropyltrimethoxysilane (KH-570) was used as modifier to improve the superficial capacity of coal powder. The structural changes and properties of modified coal powder and composites were characterized and analyzed by Fourier Transform Infrared Spectroscopy (FTIR), surface contact angle analysis, scanning electron microscope (SEM), thermogravimetric analysis (TGA) and mechanical testing. Results show that the modified coal powder has good hydrophobicity and sea-island structure is beneficial in improving the comprehensive performance of composites. The contact angle increases from 33.8° to 91.6° after modification. The initial decomposition temperature (T0) and largest weight loss temperature (Tmd) both have an increase with coal powder content and the maximum are 431.02 °C and 465.33 °C. The mechanical properties tend to go up first and then down with the addition of coal powder. PP/26EPDM/4coal composite has best mechanical properties as well as the impact strength and elongation at break are 60.9 MPa, 615.0%, respectively.

Interplay of fabric structure and shear thickening fluid impregnation in moderating the impact response of high-performance woven fabrics

2020 ◽  
Vol 54 (28) ◽  
pp. 4387-4395
Author(s):  
Sanchi Arora ◽  
Abhijit Majumdar ◽  
Bhupendra Singh Butola
Keyword(s):  
Beneficial Effect ◽  
Energy Absorption ◽  
Impact Energy ◽  
High Performance ◽  
Research Work ◽  
Impact Resistance ◽  
Woven Fabrics ◽  
Woven Fabric ◽  
Fabric Structure ◽  
The Impact

The beneficial effect of STF impregnation in enhancing the impact resistance of high-performance fabrics has been extensively reported in the literature. However, this research work reports that fabric structure has a decisive role in moderating the effectiveness of STF impregnation in terms of impact energy absorption. Plain woven fabrics having sett varying from 25 × 25 inch−1 to 55 × 55 inch−1 were impregnated with STF at two different padding pressures to obtain different add-ons. The impact energy absorption by STF impregnated loosely woven fabrics was found to be higher than that of their neat counterparts for both levels of add-on, while opposite trend was observed in case of tightly woven fabrics. Further, comparison of tightly woven plain, 2/2 twill, 3/1 twill and 2 × 2 matt fabrics revealed beneficial effect of STF impregnation, except for the plain woven fabric, establishing that there exists a fabric structure-STF impregnation interplay that tunes the impact resistance of woven fabrics.

scholarly journals Experimental Tests and Reliability Analysis of the Cracking Impact Resistance of UHPFRC

Fibers ◽  
2020 ◽  
Vol 8 (12) ◽  
pp. 74
Author(s):  
Hussain A. Jabir ◽  
Sallal R. Abid ◽  
Gunasekaran Murali ◽  
Sajjad H. Ali ◽  
Sergey Klyuev ◽  
...  
Keyword(s):  
High Performance ◽  
Steel Fiber ◽  
Impact Resistance ◽  
High Strength ◽  
Experimental Tests ◽  
Fiber Reinforced Concrete ◽  
Fiber Types ◽  
Impact Performance ◽  
High Performance Fiber ◽  
The Impact

Ultra-high performance (UHP) concrete is a special type of fibrous cementitious composite that is characterized by high strength and superior ductility, toughness, and durability. This research aimed to investigate the resistance of ultra-high performance fiber-reinforced concrete (UHPFRC) against repeated impacts. An adjusted repeated drop mass impact test was adopted to evaluate the impact performance of 72 UHPFRC disc specimens. The specimens were divided into six mixtures each of 12 discs. The only difference between the mixtures was the types of fibers used, while all other mixture components were the same. Three types of fibers were used: 6 mm micro-steel, 15 mm micro-steel, and polypropylene. All mixtures included 2.5% volumetric content of fibers, however with different combinations of the three fiber types. The test results showed that the mixtures with the 15 mm micro-steel fiber absorbed a higher number of impact blows until cracking compared to other mixtures. The mixture with pure 2.5% of 15 mm micro-steel fiber exhibited the highest impact resistance, with percentage increases over the other mixtures ranging from 25 to 140%. In addition, the Weibull distribution was used to investigate the cracking impact resistance of UHP at different levels of reliability.

scholarly journals Durability and Electrical Conductivity of Carbon Fiber Cloth/Ethylene Propylene Diene Monomer Rubber Composite for Active Deicing and Snow Melting

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2051
Author(s):  
Shuanye Han ◽  
Haibin Wei ◽  
Leilei Han ◽  
Qinglin Li
Keyword(s):  
Composite Material ◽  
Carbon Fiber ◽  
Ethylene Propylene Diene Monomer ◽  
Snow Melting ◽  
Epdm Rubber ◽  
Ethylene Propylene ◽  
Carbon Fiber Cloth ◽  
Rubber Composite ◽  
The Impact ◽  
Functional Components

To reduce the impact of road ice and snow disaster, it is necessary to adopt low energy consumption and efficient active deicing and snow melting methods. In this article, three functional components are combined into a conductive ethylene propylene diene monomer (EPDM) rubber composite material with good interface bonding. Among them, the mechanical and electrical properties of the composite material are enhanced by using carbon fiber cloth as a heating layer. EPDM rubber plays a mainly protective role. Further, aluminum silicate fiber cloth is used as a thermal insulation layer. The mechanical properties of EPDM rubber composites reinforced by carbon fiber cloth and the thermal behaviors of the composite material in high and low temperature environments were studied. The heat generation and heat transfer effect of the composite were analyzed by electrothermal tests. The results show that the conductive EPDM rubber composite material has good temperature durability, outstanding mechanical stability, and excellent heat production capacity. The feasibility of the material for road active deicing and snow melting is verified. It is a kind of electric heating deicing material with broad application prospects.

Effects of different ammonium lignosulfonate contents on the crystallization, rheological behaviors, and thermal and mechanical properties of ethylene propylene diene monomer/polypropylene/ammonium lignosulfonate composites

TAPPI Journal ◽  
2020 ◽  
Vol 19 (1) ◽  
pp. 9-17
Author(s):  
RUI GOU ◽  
MINGHUI GUO
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Raw Materials ◽  
Core Layer ◽  
Thermoplastic Elastomer ◽  
Ethylene Propylene Diene Monomer ◽  
Dynamic Vulcanization ◽  
Ethylene Propylene ◽  
Al Content ◽  
Wide Range

Thermoplastic elastomer (TPE), made from ethylene propylene diene monomer (EPDM) and poly-propylene (PP) based on reactive blending, has an excellent processing performance and characteristics and a wide range of applications. However, there are currently no reports in the literature regarding the usage of TPE in making composite boards. In this paper, EPDM, PP, and ammonium lignosulfonate (AL) were used as the raw materials, poly-ethylene wax was used as the plasticizer, and a dicumyl peroxide vulcanization system with dynamic vulcanization was used to make a new kind of composite material. This research studied the influences of the AL contents on the crystallization behaviors, rheological properties, thermal properties, and mechanical properties of the composites. The results showed that the AL content had a noticeable impact on the performance of the composite board. Accordingly, this kind of composite material can be used as an elastomer material for the core layer of laminated flooring.

scholarly journals Production and characterization of thermoplastic elastomer foams based on the styrene–ethylene–butylene–styrene (SEBS) rubber and thermoplastic material

2021 ◽  
Vol 19 (1) ◽  
pp. 929-937
Author(s):  
Ceren Kıroğlu ◽  
Nilgün Kızılcan
Keyword(s):  
Injection Molding ◽  
Impact Resistance ◽  
Morphological Structure ◽  
Thermoplastic Elastomer ◽  
Thermoplastic Elastomers ◽  
Filler Materials ◽  
Mechanical And Thermal Properties ◽  
Foaming Agent ◽  
Foaming Agents ◽  
The Impact

Abstract Thermoplastic elastomer foams based on styrene–ethylene–butylene–styrene (SEBS)/polypropylene (PP) were produced by using different processing techniques such as extrusion and injection molding to achieve optimized mechanical and thermal properties in terms of strength, elongation, and damping capability. Foaming is a method of introducing gas-filled cells into the material and it is considered an effective way to meet the requirements for higher impact resistance with low density and relatively low hardness. In this study, microspheres were used as a foaming agent and were introduced to the system by using an injection molding machine. They were used in different percentages and ranged from 1 and 3%. They decrease the density of the product thereby lowering the weight and cost. Besides improving damping abilities and decreasing the density, inorganic fillers such as talc, silica, and calcium carbonate were used to increase the mechanical strength, and their effectivity was also investigated. It was observed that a higher amount of foaming agent lowered the density by creating voids in the blend, as expected. The introduction of fillers increases the mechanical properties; however, the density had a negative effect even in the presence of foaming agents. About 3% density reduction can be achieved in the presence of talc and a foaming agent whereas the other fillers had an opposite effect on the density. Accordingly, the impact resistance was affected negatively because of the stiffness of the filler materials, and the highest Izod impact value was 50.2 kJ/m2. The elastic modulus values for foamed samples and filled with CaCO3, talc, and silica were 808, 681, and 552 MPa respectively. Combining foaming and thermoplastic elastomers (TPEs) offers a wide variety of possibilities to new and existing applications. In addition to low hardness and density, foaming provides better damping ability thanks to its morphological structure.

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