Tribology of ultra-high molecular weight polyethylene disks molded at different temperatures

Aoike, Taku; Yokoyama, D.; Uehara, Hiroki; Yamanobe, Takeshi; Kōmoto, Tadashi

doi:10.1016/j.wear.2006.08.006

Cited by 16 publications

(8 citation statements)

References 27 publications

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“…Several studies have reported an increase in PE crystallinity upon ageing, [15,18,[51][52][53][54] and this behaviour has been related to a rearrangement of the polymeric chains as a result of their increased mobility due to thermal ageing. [52] However, for EtO-sterilized samples, this effect appeared less pronounced [51] ; on the other hand, thermally unstabilized XLPE samples submitted to accelerated ageing did not display any increase in crystallinity, [55] as well as XLPE and UHMWPE components after 2 years of real-time shelf ageing.…”

Section: Discussionmentioning

confidence: 99%

Comparative micro‐Raman study on standard, cross‐linked and vitamin E‐blended polyethylene acetabular cups after long‐term in vitro testing and ageing

Taddei

Pavoni

Affatato

2017

J Raman Spectroscopy

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Ultra‐high molecular‐weight polyethylene has been used in total joint replacement for the last three decades. Many attempts have been made to improve the wear behaviour of this material. Highly cross‐linked polyethylene (XLPE) has been developed to decrease the wear rate, while the addition of stabilizers such as vitamin E has been proposed to slow the oxidation processes. In this study, we compared the wear behaviour of conventional ultra‐high molecular‐weight polyethylene, XLPE and vitamin E‐added XLPE acetabular cups for total hip arthroplasty. The samples were run for five million cycles on a hip joint simulator (first test), then underwent an accelerated ageing treatment, were tested again for two million cycles (second test) and finally were run for another two million cycles in presence of third‐body particles (third test). Our study showed that vitamin E‐added XLPE cups had a better wear behaviour only in the long‐term and more severe testing conditions: in the third test, they underwent the lowest increase in wear rate. Micro‐Raman spectroscopy allowed us to analyse the wear degradation of the cups on a molecular scale, and differences in the wear mechanisms were revealed. The presence of vitamin E did not prevent structural changes upon the first test, while it did in ageing and in the second test. In the third test, more significant structural changes were observed; the XLPE cups, which lost the lowest mass, had the most modified articular surface. These morphological aspects should be taken into account, together with gravimetric wear rates, in the characterization of wear degradation. Copyright © 2017 John Wiley & Sons, Ltd.

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Section: Discussionmentioning

confidence: 99%

Comparative micro‐Raman study on standard, cross‐linked and vitamin E‐blended polyethylene acetabular cups after long‐term in vitro testing and ageing

Taddei

Pavoni

Affatato

2017

J Raman Spectroscopy

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“…UHMWPE' in yüksek molekül ağırlığı, polimere yüksek aşınma ve darbe dayanımı ve kendi kendini yağlama özelliği sağlar. UHMWPE'in bu üstün özelliklerine rağmen, kalça protezlerinde uzun süreli kullanım sonucu meydana gelen aşınma, osteoliz ve aseptik gevşeme beraberinde kemik kaybına, rahatsızlığa, eklem gevşemesine neden olur ve sonuçta eklemlerin ömrünü sınırlar [23], [25]- [28] UHWMPE' in mekanik ve tribolojik özelliklerinin arttırılması, günümüzde güncel bir araştırma konusudur. Birçok araştırmacı UHMWPE' in aşınma dayanımlarını arttırmak amacıyla; polietilen matriks içerisine metal (karbon fiber, karbon nanatüp, grafit), seramik (alumina, titanya, zirkonya, hidroksiapatit, kuartz, vollastonit,) ve farklı polimerler (poliüretan, phenyl p-hydroxyzoate vb.)…”

Section: Gi̇ri̇ş (Introduction)unclassified

Production and Characterization of UHMWPE- Al2O3-HAp Hybride Composites

Efe

Yener

2022

Politeknik Dergisi

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Total Kalça Protezi, kalça ekleminin fonksiyonunu görmediği durumlarda kullanılan ve kalça ekleminin yerini alan, vücuda uyumlu malzemelerden yapılmış implantlardır. Kalça protezlerinde görülen en yaygın hasar, asetabular yuva ve liner parçalarında hareket sırasında zamanla meydana gelen aşınmadan kaynaklanmaktadır. Total kalça protezlerinde en yaygın kullanılan malzeme çifti metalik femur başı üzerine yüksek molekül ağırlıklı polietilen (UHMWPE) yuva ve linerdır. Mevcut çalışmada total kalça protez implantlarının yuva ve liner parçalarının sürtünme ve aşınma dayanımlarının arttırılması hedeflenmiştir. Bu amaçla UHMWPE’e ağırlıkça % 1 , 2 ve 3 oranında biyouyumlu, doğal kemik ile benzer yapıda olan Hidroksiapatit (HAp) tozu ve biyouyumlu, aşınmaya karşı dayanıklı Al2O3 tozu ilave edilmiştir. Santrifüj metodu ile karıştırılan toz karışımları 20mm çapındaki silindirik bir kalıp içerisinde 200°C’ de 1 saat sıcak preslenmiştir. Numunelerin kırık yüzey SEM incelemeleri, takviye elemanlarının UHMWPE matris içerisinde homojen olarak dağıldığını göstermiştir. Takviye elemanlarının varlığı, SEM-EDS ve XRD analizi ile ispatlanmıştır. Kompozitlerin sertlik değerlerinin takviye elemanlarının ilavesi ile 40 MPa dan 66,6 MPa değerine arttığı gözlenmiştir. Kompozit numunelerin ergime sıcaklığının yaklaşık 140 °C olduğu DSC analizi ile belirlenmiştir.

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“…Among them ultra high molecular weight polyethylene (UHMWPE) is widely used in orthopedic implants, like hip joint replacement prostheses, because of its excellent characteristics, such as high wear and abrasion resistance, chemical inertness and biocompatibility [2][3][4][5]. Despite its widespread use, the low surface hardness and poor wear resistance of polymer causes wear, leading to osteolysis, which will cause bone loss, joint loosening, discomfort, and ultimately limits the lifespan of the joints.…”

Section: Introductionmentioning

confidence: 99%

Characterization of UHWPE-TiO₂ Composites Produced by Gelation/Crystallization Method

2017

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In this study, ultra-high molecular weight polyethylene (UHMWPE) -TiO2 composites reinforced with TiO2 particles with weight ratios of 0.5, 1 and 2% were produced by gelation/crystallization method in decalin+antioxidant solution of UHMWPE at 150• C, for 40 min by using magnetic stirrer. The gel mixture was cooled in an aluminum tray embedded in iced water under ambient conditions and dried in an oven at 130• C for 90 min to remove any residual trace of decalin. Distribution and elemental analyses of TiO2 particles in polymer matrix was examined by SEM-EDS. Crystallization behavior was investigated by differential scanning calorimetry (DSC). Based on the results, TiO2 particles in the UHMWPE have accelerated the crystallization, acting as nucleating agents, with increment from 56% for UHMWPE to 63.5% for UHMWPE-2 wt% TiO2. The present bond types in composites were analyzed by Raman spectroscopy and the results are in good agreement with literature. Uniaxial tensile tests were performed to determine Young's modulus of UHMWPE-TiO2 composites. It was found that Young's modulus of UHMWPE was increased from 52 MPa to 800 MPa with the addition of TiO2 particles.

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Tribology of ultra-high molecular weight polyethylene disks molded at different temperatures

Cited by 16 publications

References 27 publications

Comparative micro‐Raman study on standard, cross‐linked and vitamin E‐blended polyethylene acetabular cups after long‐term in vitro testing and ageing

Comparative micro‐Raman study on standard, cross‐linked and vitamin E‐blended polyethylene acetabular cups after long‐term in vitro testing and ageing

Production and Characterization of UHMWPE- Al2O3-HAp Hybride Composites

Characterization of UHWPE-TiO₂ Composites Produced by Gelation/Crystallization Method

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Tribology of ultra-high molecular weight polyethylene disks molded at different temperatures

Cited by 16 publications

References 27 publications

Comparative micro‐Raman study on standard, cross‐linked and vitamin E‐blended polyethylene acetabular cups after long‐term in vitro testing and ageing

Comparative micro‐Raman study on standard, cross‐linked and vitamin E‐blended polyethylene acetabular cups after long‐term in vitro testing and ageing

Production and Characterization of UHMWPE- Al2O3-HAp Hybride Composites

Characterization of UHWPE-TiO2 Composites Produced by Gelation/Crystallization Method

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Product

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About

Characterization of UHWPE-TiO₂ Composites Produced by Gelation/Crystallization Method