Fractographic analysis of composites based on ultra high molecular weight polyethylene

Сенатов, Ф.С.; Горшенков, М.В.; Tcherdyntsev, Victor V.; Kaloshkin, S.D.; Sudarchikov, V.A.

doi:10.1016/j.compositesb.2013.08.083

Cited by 41 publications

(27 citation statements)

References 38 publications

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“…Figure shows the plastic deformation of the initial polymer particles. Shape changes promote the formation of a denser structure by increasing the contact area during thermal compaction . The elongational flow reduces the entanglement of molecular chains within particles and promotes the diffusion of interparticle chains.…”

Section: Resultsmentioning

confidence: 99%

“…Shape changes promote the formation of a denser structure by increasing the contact area during thermal compaction. 30 The elongational flow reduces the entanglement of molecular chains within particles and promotes the diffusion of interparticle chains. The decrease in melt defects improves the overall mechanical properties of the UHMWPE samples.…”

Section: Morphologymentioning

confidence: 99%

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Properties of compression molded ultra‐high molecular weight polyethylene products pretreated by eccentric rotor extrusion

Feng

Chen

et al. 2019

Polymer International

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Low processing efficiency and fusion defects limit the application of ultra‐high molecular weight polyethylene (UHMWPE) in artificial joint implants. These problems result from the high melt viscosity of UHMWPE. Here, we use an eccentric rotor extruder (ERE) based on elongational flow to pretreat UHMWPE. Compression molded UHMWPE is obtained without and with ERE pretreatment (EP‐UHMWPE). The processing efficiency of EP‐UHMWPE is improved compared with direct compression molded UHMWPE. This is because the preheating time can be omitted during the molding process, and the residence time of UHMWPE in the extruder is less than 90 s. The mechanical properties and friction resistance of EP‐UHMWPE are significantly improved compared with those of direct compression molded UHMWPE. The yield strength increases from 21 MPa to 23 MPa, the tensile strength increases from 36 MPa to 46 MPa, the elongation at break increases from 610% to 700%, and the abrasion loss decreases from 1.73 mg/1000 r to 0.93 mg/1000 r when UHMWPE is subjected to ERE pretreatment. We attribute these improvements to the elongational flow enhancing the orientation and disentanglement of UHMWPE molecular chains, which in turn improves particle fusion. The molecular weight is well maintained when subjected to ERE pretreatment. UHMWPE components pretreated by ERE have good prospects in artificial joint implants. © 2019 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Section: Morphologymentioning

confidence: 99%

Properties of compression molded ultra‐high molecular weight polyethylene products pretreated by eccentric rotor extrusion

Feng

Chen

et al. 2019

Polymer International

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“…The surface of the sample has small voids, which are attributed to a low UHMWPE content. Figure 6b is a SEM image of sample A85, showing a ductile fracture of UHMWPE that contributes to increase the tenacity 7,8 . Figure 7 is a SEM image of an A95 sample, showing alumina particles with irregular shapes and high porosity.…”

Section: Ballistic Testsmentioning

confidence: 99%

“…The purpose of this work was to investigate the properties of alumina-UHMWPE composites in which UHMWPE is used to decrease density and increase flexural strength and fracture toughness, making the shield more suitable for personal protection and avoiding fracture after the first shot 7,8 . There is also an economic factor involved, since the composite is prepared at a relatively low temperature, 230 o C, while pure alumina must be prepared sintering alumina powder at high temperatures, of the order of 1400ºC, a more expensive procedure 9 .…”

Section: Introductionmentioning

confidence: 99%

Response to Ballistic Impact of Alumina-UHMWPE Composites

et al. 2018

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The response to ballistic impact of alumina-ultra high molecular weight polyethylene (UHMWPE) composites with different relative concentrations of alumina was investigated. The impact tests were carried out at subsonic speed using a compressed air system. The results showed that the depth of penetration (DOP) in a Medium Density Fiberboard (MDF) bulkhead protected by a disk of the composite decreased with increasing concentration of alumina in the composite. Scanning electron microscopy (SEM) images of composites with 80 %, 85 % and 95 % alumina showed transgranular, intergranular and ductile fracture mechanisms.

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“…Rubber particle elasticity and cavitation efficiency decrease as the NC particles confine to the dispersed rubber particles. [20][21][22] However, a comprehensive study on the toughening mechanisms of thermoplastic rubber blends requires a combination of microscopic techniques because each microscopy technique has its specific benefits and drawbacks; in other words, some deformation mechanisms can only be detected using a particular microscope. [12,13] It is well documented that the strong adhesion between matrix and rubber phase diminishes the rubber particle size and dictates the first step of fracture sequence to be either matrix-rubber debonding or rubber particle cavitation.…”

Section: Introductionmentioning

confidence: 99%

Toughening of polyamide 12/nanoclay nanocomposites by incompatible styrene‐butadiene‐styrene rubber through tailoring interfacial adhesion and fracture mechanism

2017

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The main drawback of polyamide 12 (PA 12)/nanoclay nanocomposites in their wide range of potential engineering applications known as diminished toughness was overcome using incompatible styrene-butadiene-styrene block copolymer (SBS) rubber. Applying optimal processing parameters for co-rotating twin-screw extrusion resulted in strong interfacial adhesion of matrix and rubber and intercalated and delaminated nanoclay stacks confined in the matrix. The formulation of compatibilized PA 12/SBS/nanoclay nanocomposites was optimized by employing response surface Box-Behnken methodology. A combination of microscopic methods, that is, atomic force microscopy, transmission and scanning electron microscopy, and transmission optical microscopy, along with single-edge-double-notch four-point-bending technique, was exploited to exhaustively explore the toughening mechanisms and microstructure. The findings verify that by tailoring the rubber/matrix interfacial strength and nanocomposite morphology, the Izod impact strength of PA 12/nanoclay nanocomposites is noticeably improved even by incorporating an incompatible rubber and tough fracture mechanisms including rubber particle cavitation and largescale shear yielding are attained. K E Y W O R D Sdamage zone, nanocomposites, polyamides, rubber, toughness

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Fractographic analysis of composites based on ultra high molecular weight polyethylene

Cited by 41 publications

References 38 publications

Properties of compression molded ultra‐high molecular weight polyethylene products pretreated by eccentric rotor extrusion

Properties of compression molded ultra‐high molecular weight polyethylene products pretreated by eccentric rotor extrusion

Response to Ballistic Impact of Alumina-UHMWPE Composites

Toughening of polyamide 12/nanoclay nanocomposites by incompatible styrene‐butadiene‐styrene rubber through tailoring interfacial adhesion and fracture mechanism

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