Molecular Orientation, Crystallinity, and Topographical Changes in Sliding and their Frictional Effects for UHMWPE Film

Minn, Myo; Sinha, Sujeet K.

doi:10.1007/s11249-009-9419-5

Cited by 18 publications

(11 citation statements)

References 33 publications

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“…As to 30 min, area of MF has been predominant at the friction surface. On the other hand, PS and MF frequently lead to chains disentanglement and orientation parallel to sliding direction . As a consequence, chains conformation and crystal polymorphs will be correspondingly changed.…”

Section: Resultsmentioning

confidence: 99%

Friction‐induced electroactive β polymorph of poly(vinylidene fluoride)

Xin

2018

J of Applied Polymer Sci

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Poly(vinylidene fluoride) (PVDF) has been widely used in electric devices due to electroactive b polymorph. In this article, we probe the formation of b phase under friction by spectroscopy and thermal analysis. During continuous friction, entire sliding of PVDF is identified with two regimes, i.e., running-in and steady-state. At initial running-in period, friction surfaces are dominated by plastic strain, which leads to striking formation of b phase from a polymorph (a!b). Subsequently, melting-flow domains almost cover friction surfaces at steady-state. Thus, formation of b crystal is correspondingly induced by shear crystallization. Nevertheless, b-crystal content at steady-state is lower than that at running-in. With sliding proceeding, moreover, b-crystal content exhibits a gradually decreasing tendency, attributed to rising surface temperature. Besides, the friction-induced b phase is further confirmed by evaluation of wear debris. Overall, friction plays a crucial role as to the formation of b phase. V C 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46395.

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Section: Resultsmentioning

confidence: 99%

Friction‐induced electroactive β polymorph of poly(vinylidene fluoride)

Xin

2018

J of Applied Polymer Sci

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“…This transition zone is characterized by a rearrangement of the originally randomly oriented lamellae into a wear‐induced preferential orientation. Moreover, the wear‐induced modifications in molecular orientation, crystallinity, but also topographical changes themselves lead to an anisotropic frictional behavior of the UHMWPE 34…”

Section: Resultsmentioning

confidence: 99%

Near‐Surface Microstructural Reorganization of UHMWPE under Cyclic Load – A Pilot Study

et al. 2011

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We report a depth‐resolved analysis of the microstructure of a bulge‐like failure in a medical grade ultra high molecular weight polyethylene (UHMWPE) implant material induced by a cyclic load. The depth‐dependent arrangement of the crystalline lamellae was analyzed by cross‐sectional transmission electron microscopy (TEM). The failure emerges at the top wear surface as an amorphous bulge with a maximum thickness of approximately 300 µm. A sharp interface below the bulge consists of an approximately 0.1 µm thick boundary layer with stacked lamellae with an outstanding degree of orientation perpendicular to the wear surface. The boundary layer is separated from the intact, unmodified base material with random lamellar orientation by an approximately 5 µm thick transition zone with a lamellar alignment perpendicular to the wear surface, which decreases toward the center of the UHMWPE test specimen. We further observed an overall decrease of lamellar thickness toward the wear surface within the influence zone. This indicates the strength and heterogeneity of the local dynamic stress field during cyclic wear and the ease for lamellar rearrangements presumably facilitated by a locally elevated temperature. We propose the bulge to originate from either wear material dragged along the wear surface or from a retransfer from the articulating counter surface, and discuss implications on the degree and relevance of adhesive wear. This study stresses the importance of the UHMWPE transfer material under such dynamic load conditions. Our approach seems suitable for investigating the mechanical aspect of failure mechanisms at the UHMWPE polymer biointerface under cyclic load.

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“…Minn et al [ 56 ] also investigated the effect of sliding in different directions on a UHMWPE coating deposited on a DLC-modified Si substrate. They showed that the sliding of the ball on the UHMWPE coating induces changes in the crystallinity of the coating which in turn effects the tribological performance.…”

Section: Uhmwpe Coatings For Different Applicationsmentioning

confidence: 99%

“…They are: Pre-Treatment of the Si Substrate (Piranha Treatment) : A proper pre-treatment of the Si substrate so that the surface is devoid of any hydrocarbons or impurities and also increasing the wettability of the surface so that it will help in improving the adhesion of the coating to the substrate, which in turn affects its tribologial performance. In the literature presented above [ 52 , 53 , 54 , 55 , 56 , 57 ], they used a piranha treatment, which was very effective in cleaning and improving the wettability of the surface. The steps in piranha treatment include the following: Si substrates were rinsed for 1 min and ultrasonically cleaned for 15 min each, first with soapy water, second with distilled water and finally with acetone.…”

Section: Uhmwpe Coatings For Different Applicationsmentioning

confidence: 99%

Recent Advances in UHMWPE/UHMWPE Nanocomposite/UHMWPE Hybrid Nanocomposite Polymer Coatings for Tribological Applications: A Comprehensive Review

Samad

2021

Polymers

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In the recent past, polymer coatings have gained the attention of many researchers due to their low cost, their ability to be coated easily on different substrates, low friction and good anti-corrosion properties. Various polymers such as polytetrafluroethylene (PTFE), polyether ether ketone (PEEK), polymethylmethacrylate (PMMA), polyurethane (PU), polyamide (PA), epoxy and ultra-high molecular weight polytheylene (UHMWPE) have been used to develop these coatings to modify the surfaces of different components to protect them from wear and corrosion. However, among all these polymers, UHMWPE stands out as a tribologist’s polymer due to its low friction and high wear resistance. These coatings have found their way into applications ranging from microelectro mechanical systems (MEMS) to demanding tribological applications such as bearings and biomedical applications. Despite its excellent tribological properties, UHMWPE suffers from limitations such as low load bearing capacity and low thermal stability. To overcome these challenges researchers have developed various routes such as developing UHMWPE composite and hybrid composite coatings with several types of nano/micro fillers, developing composite films system and developing dual film systems. The present paper is an effort to summarize these various routes adopted by different researchers to improve the tribological performance of UHMWPE coatings.

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Molecular Orientation, Crystallinity, and Topographical Changes in Sliding and their Frictional Effects for UHMWPE Film

Cited by 18 publications

References 33 publications

Friction‐induced electroactive β polymorph of poly(vinylidene fluoride)

Friction‐induced electroactive β polymorph of poly(vinylidene fluoride)

Near‐Surface Microstructural Reorganization of UHMWPE under Cyclic Load – A Pilot Study

Recent Advances in UHMWPE/UHMWPE Nanocomposite/UHMWPE Hybrid Nanocomposite Polymer Coatings for Tribological Applications: A Comprehensive Review

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