Wear of thermoplastics determined by multiple scratching

Bermúdez, Marı́a-Dolores; Brostow, Witold; Carrión-Vilches, Francisco-José; Cervantes, Juan José; Pietkiewicz, Dorota

doi:10.1515/epoly.2005.5.1.1

Cited by 32 publications

(30 citation statements)

References 13 publications

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“…31,32 All polymers studied so far exhibit strain hardening in sliding wear-except for polystyrene that is an outlier also here, as seen in Fig. 3.…”

Section: Strain Hardening and Brittlenessmentioning

confidence: 66%

Sliding wear, viscoelasticity, and brittleness of polymers

2006

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We have connected viscoelastic recovery (healing) in sliding wear to free volume in polymers by using pressure-volume-temperature (P-V-T) results and the Hartmann equation of state. A linear relationship was found for all polymers studied with a wide variety of chemical structures, except for polystyrene (PS). Examination of the effect of the indenter force level applied in sliding wear on the healing shows that recovery is practically independent of that level. Strain hardening in sliding wear was observed for all materials except PS, the exception attributed to brittleness. Therefore, we have formulated a quantitative definition of brittleness in terms of elongation at break and storage modulus. Further, we provide a formula relating the brittleness to sliding wear recovery; the formula is obeyed with high accuracy by all materials including PS. High recovery values correspond to low brittleness, and vice versa. Our definition of brittleness can be used as a design criterion for choosing polymers for specific applications.

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“…31,32 All polymers studied so far exhibit strain hardening in sliding wear-except for polystyrene that is an outlier also here, as seen in Fig. 3.…”

Section: Strain Hardening and Brittlenessmentioning

confidence: 66%

Sliding wear, viscoelasticity, and brittleness of polymers

2006

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“…Work along these lines is ongoing, for instance, by Ehrenstein and coworkers 21,22 as well as in LAPOM. [23][24][25][26] There exists a variety of approaches to polymer reinforcement including introduction of ceramic fibers, 27 introduction of carbon nanotubes, 28 irradiation, 22,29,30 or imposition of magnetic fields. 24 Blending is one more such option 31 and we are planning, using oligomer VI as an additive to several engineering polymers, to see whether tribological properties can thus be improved.…”

Section: Applicationsmentioning

confidence: 99%

Formation of polymethylsiloxanes with alkyl side groups

Mukbaniani¹,

Titvinidze²,

Tatrishvili³

et al. 2007

J of Applied Polymer Sci

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Hydrosilylation of a,o-bis(trimethylsiloxy)-methylhydrosiloxane to alkenes in the presence of a catalyst was performed at several temperatures (30-708C). Combtype methylsiloxane oligomers with various alkyl substituted groups in the side chains have been obtained. Not all active BSiÀ ÀH groups participate in the reaction. The reaction order, activation energies, and rate constants have been determined. The synthesized oligomers were characterized by 1 H, 13 C, 1 H COSY NMR, and FTIR spectroscopy. Calculations using the quantum-chemical semiempirical AM1 method for modeling reaction between methyldimethoxysilane [Me(MeO) 2 SiH] and hexene-1 were performed to evaluate possible reaction paths. For all initial, intermediate, and final products, enthalpies of formation as a function of the distance between BCÀ ÀSiB bonds are calculated. The hydride addition is energetically more favorable according to the antiMarkovnikov rule than according to the Markovnikov rule. Comb-type oligomers were characterized by gel-permeation chromatography, differential scanning calorimetry, thermogravimetry, and wide-angle X-ray diffractometry.

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“…Specimens were tested using a CSM Micro-Scratch Tester (MST) following the procedure previously described [1,2,6,[15][16][17]. Sliding wear (repetitive scratching along the same groove) tests were performed as follows: normal load 5.0, 10.0 and 15.0 N; scratch length 5.0 mm; scratch velocity 2.5, 5.0 and 15.0 mm/min at room temperature.…”

Section: Scratch Testingmentioning

confidence: 99%

“…We have previously reported [17,26] that glassy polystyrene (PS) is an exception among all polymers investigated in sliding wear mode. Namely, PS does not show a horizontal asymptote in residual depth values as a function of the number of scratches.…”

Section: Sliding Wearmentioning

confidence: 99%

“…Dynamic friction decreased for TPUs with low hardness but increased for TPUs with high hardness -hence also here we are dealing with a two-edged sword. In general, tribology of polymer-based materials (PBMs) is significantly more difficult than tribology of metals although some approaches that work have been developed [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. In this situation, we have decided to investigate further effects of the presence of organoclay on tribological behavior an engineering polymer.…”

Section: Introductionmentioning

confidence: 99%

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Scratch resistance of a polycarbonate + organoclay nanohybrid

Arribas¹,

Bermúdez²,

Brostow³

et al. 2009

Express Polym. Lett.

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Abstract.A polycarbonate-based nanohybrid has been created containing 1 wt% of Bentone 2010, an organically modified montmorillonite. A micro-section on the nanohybrid obtained using focused ion beam (FIB) and field emission scanning electron microscopy (FESEM) was employed to observe the orientation of the nanoclay inside a polycarbonate (PC) matrix in the cross-section FIB-milled face. A micro-scratch tester was used to measure the scratch resistance in terms of residual (healing) depth Rh under progressive load and in sliding wear. Effects of the number of scratches, normal load and scratch velocity have been evaluated as a function of nanoclay orientation. In sliding wear (multiple scratching along the same groove), our nanohybrid reaches residual depth values that remain constant after a certain number of scratches, a manifestation of strain hardening. The number of scratches to induce strain hardening decreases as the normal applied load increases. SEM was used to characterize deformation and wear mechanisms that operate on contacts and the results related to the wear data.

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Wear of thermoplastics determined by multiple scratching

Cited by 32 publications

References 13 publications

Sliding wear, viscoelasticity, and brittleness of polymers

Sliding wear, viscoelasticity, and brittleness of polymers

Formation of polymethylsiloxanes with alkyl side groups

Scratch resistance of a polycarbonate + organoclay nanohybrid

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