Investigation on the Influences of Hygrothermal Aging on the Indentation Size Effects and Micro-Indentation Measurements of PMMA. Part I: Experimental Results

Lin, Hui; Li, Lin; Jin, Tao

doi:10.3390/app10165454

Cited by 8 publications

(5 citation statements)

References 41 publications

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“…During the indentation experiments, hardness, modulus and other properties change not only with the hold time (or dwell time, i.e., the time of maximum load), but also with loading and unloading rate [ 17 , 18 ]. Moreover, the indentation properties tend to change with the maximum loading force, which is usually denoted as the indentation size effect [ 19 , 20 , 21 , 22 ]. In dynamic experiments the indentation moduli and damping factors depend on the frequency of force oscillations; this is analogous to dynamic mechanical analysis in macroscale [ 8 , 18 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Macro-, Micro- and Nanomechanical Characterization of Crosslinked Polymers with Very Broad Range of Mechanical Properties

et al. 2020

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This work is focused on the comparison of macro-, micro- and nanomechanical properties of a series of eleven highly homogeneous and chemically very similar polymer networks, consisting of diglycidyl ether of bisphenol A cured with diamine terminated polypropylene oxide. The main objective was to correlate the mechanical properties at multiple length scales, while using very well-defined polymeric materials. By means of synthesis parameters, the glass transition temperature (Tg) of the polymer networks was deliberately varied in a broad range and, as a result, the samples changed their mechanical behavior from very hard and stiff (elastic moduli 4 GPa), through semi-hard and ductile, to very soft and elastic (elastic moduli 0.006 GPa). The mechanical properties were characterized in macroscale (dynamic mechanical analysis; DMA), microscale (quasi-static microindentation hardness testing; MHI) and nanoscale (quasi-static and dynamic nanoindentation hardness testing; NHI). The stiffness-related properties (i.e., storage moduli, indentation moduli and indentation hardness at all length scales) showed strong and statistically significant mutual correlations (all Pearson′s correlation coefficients r > 0.9 and corresponding p-values < 0.001). Moreover, the relations among the stiffness-related properties were approximately linear, in agreement with the theoretical prediction. The viscosity-related properties (i.e., loss moduli, damping factors, indentation creep and elastic work of indentation at all length scales) reflected the stiff-ductile-elastic transitions. The fact that the macro-, micro- and nanomechanical properties exhibited the same trends and similar values indicated that not only dynamic, but also quasi-static indentation can be employed as an alternative to well-established DMA characterization of polymer networks.

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Section: Introductionmentioning

confidence: 99%

Macro-, Micro- and Nanomechanical Characterization of Crosslinked Polymers with Very Broad Range of Mechanical Properties

et al. 2020

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“…The rule of mixtures 62,63 has been adopted to provide a theoretical estimation, which is expressed as: E Mix = E Ag V Ag + E PMMA V PMMA where E Ag and E PMMA are the elastic moduli of Ag and PMMA, respectively; V Ag and V PMMA are the volume fractions of Ag and PMMA, respectively; and E Mix is the elastic modulus of the composite film from mixture theory. The values of E Ag and E PMMA are taken from the literature as 88 GPa 53 and 5.2 GPa, 61 respectively.…”

Section: Resultsmentioning

confidence: 99%

Atomic insights into thickness-dependent deformation mechanism and mechanical properties of Ag/PMMA ultra-thin nanofilms

Lin¹,

Gao²,

Chen³

et al. 2023

Nanoscale Adv.

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“…The mechanical properties at nanoscale (micro-elastic modulus (E) and micro-hardness (H)) of all CAD/CAM restorative materials involved in the study were investigated by nanoindentation using a nanoindenter test system (G200 Keysight Technologies, Santa Rosa, CA, USA). The continuous hardness and elastic modulus with indentation depth can be obtained through the continuous stiffness measurement (CSM) technique [ 17 , 18 ]. In the CSM method, the indenter tip approaches the surface with an approach velocity of 10 nm/s.…”

Section: Methodsmentioning

confidence: 99%

Mechanical Properties of Polymer-Based Blanks for Machined Dental Restorations

et al. 2021

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The tremendous technological and dental material progress led to a progressive advancement of treatment technologies and materials in restorative dentistry and prosthodontics. In this approach, CAD/CAM restorations have proven to be valuable restorative dental materials in both provisional and definitive restoration, owing to multifarious design, improved and highly tunable mechanical, physical and morphological properties. Thus far, the dentistry market offers a wide range of CAD/CAM restorative dental materials with highly sophisticated design and proper characteristics for a particular clinical problem or multiple dentistry purposes. The main goal of this research study was to comparatively investigate the micro-mechanical properties of various CAD/CAM restorations, which are presented on the market and used in clinical dentistry. Among the investigated dental specimens, hybrid ceramic-based CAD/CAM presented the highest micro-mechanical properties, followed by CAD/CAM PMMA-graphene, while the lowest micro-mechanical features were registered for CAD/CAM multilayered PMMA.

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Investigation on the Influences of Hygrothermal Aging on the Indentation Size Effects and Micro-Indentation Measurements of PMMA. Part I: Experimental Results

Cited by 8 publications

References 41 publications

Macro-, Micro- and Nanomechanical Characterization of Crosslinked Polymers with Very Broad Range of Mechanical Properties

Macro-, Micro- and Nanomechanical Characterization of Crosslinked Polymers with Very Broad Range of Mechanical Properties

Atomic insights into thickness-dependent deformation mechanism and mechanical properties of Ag/PMMA ultra-thin nanofilms

Mechanical Properties of Polymer-Based Blanks for Machined Dental Restorations

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