Elastic Moduli of Ultrathin Amorphous Polymer Films

Stafford, Christopher M.; Vogt, Bryan D.; Harrison, Christopher; Julthongpiput, Duangrut; Huang, Rui

doi:10.1021/ma060790i

Cited by 400 publications

(460 citation statements)

References 38 publications

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“…5-20 nm diameter) is a reduction of elastic modulus, Poisson's ratio, and yield stress of these fibers as compared to the bulk counterparts, all of which we attribute to an intrinsically mobile surface layer. Significantly, our results for decreasing stiffness with decreasing fiber diameter are consistent with simulations of nanoscale cantilevered free-standing film 25,26 and adhered thin film simulations 27 as well as with experiments on adhered thin films of amorphous glassy polymers [30][31][32] of comparable ( <50 nm) physical dimensions.…”

Section: Discussionsupporting

confidence: 88%

Mechanical Properties of Glassy Polyethylene Nanofibers via Molecular Dynamics Simulations

2009

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The extent to which the intrinsic mechanical properties of polymer fibers depend on physical size has been a matter of dispute that is relevant to most nanofiber applications. Here, we report the elastic and plastic properties determined from molecular dynamics simulations of amorphous, glassy polymer nanofibers with diameter ranging from 3.7 to 17.7 nm. We find that, for a given temperature, the Young's elastic modulus E decreases with fiber radius and can be as much as 52% lower than that of the corresponding bulk material. Poisson's ratio ν of the polymer comprising these nanofibers was found to decrease from a value of 0.3 to 0.1 with decreasing fiber radius. Our findings also indicate that a small but finite stress exists on the simulated nanofibers prior to elongation, attributable to surface tension. When strained uniaxially up to a tensile strain of ε = 0.2 over the range of strain rates and temperatures considered, the nanofibers exhibit a yield stress σ y between 40 and 72 MPa, which is not strongly dependent on fiber radius; this yield stress is approximately half that of the same polyethylene simulated in the amorphous bulk.

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Section: Discussionsupporting

confidence: 88%

Mechanical Properties of Glassy Polyethylene Nanofibers via Molecular Dynamics Simulations

2009

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“…Therefore, the dispersion, interfacial adhesion, geometric dimensions, etc., play key roles in mechanical property enhancement [76,[129][130][131]. The mechanical properties can be evaluated by either conventional methods such as dynamic mechanical analysis (DMA) [27,132]; tensile, compression, and shear tests [25,[133][134][135]; or the new methods such as copper grid technique [136,137] and strain-induced elastic buckling instability for mechanical measurements [138][139][140]. Since stiffness is not significantly affected by the degree of interfacial bonding in polymer composites [141,142], it is not reviewed here.…”

Section: Influence Of Interface On Mechanical Propertiesmentioning

confidence: 99%

A review on the role of interface in mechanical, thermal, and electrical properties of polymer composites

Kashfipour

Mehra

Zhu

2018

Adv Compos Hybrid Mater

173

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Composite materials and especially polymer composites are widely used in daily life and different industries due to their vastly different properties and design flexibility. It is known that the properties of the composites are strongly related to the properties of its constituents. However, it has been reported in many studies, experimentally and by simulations, that the characteristics of the composites do not follow the rule of mixing. It means that in addition to properties of the constituents, there are other parameters affecting the final physicochemical properties of composites. The interfacial interactions between fillers and host is one of the factors which can strongly affect the properties of the composite. In this review, we summarized the type of interactions between the constituents, their improvement techniques, interaction measurement methods, and the effects of interfacial interactions on thermal, mechanical, and electrical properties of composites.

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“…A frequent failure mechanism in these materials is buckling of the thin films, resulting in interfacial delamination and fracture [1,2]. Recently, understanding of buckle patterns has also led to applications in metrology [3][4][5], stretchable interconnects [6,7], and optical gratings [8]. Previous studies on thin film buckling have focused on one of the two buckling modes, buckle-delamination or wrinkling, as illustrated in Fig.…”

mentioning

confidence: 99%

Buckling modes of elastic thin films on elastic substrates

Mei

Huang

Chung

et al. 2007

Applied Physics Letters

Self Cite

187

132

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Two buckling modes have been observed in thin films: buckle-delamination and wrinkling. This Letter identifies the conditions for selecting the favored buckling modes for elastic films on elastic substrates. Transition from one buckling mode to another is predicted as the stiffness ratio between the substrate and the film or the interfacial defect size varies. The theoretical results are demonstrated experimentally by observing the coexistence of both buckling modes and mode transition in one film-substrate system.

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Elastic Moduli of Ultrathin Amorphous Polymer Films

Cited by 400 publications

References 38 publications

Mechanical Properties of Glassy Polyethylene Nanofibers via Molecular Dynamics Simulations

Mechanical Properties of Glassy Polyethylene Nanofibers via Molecular Dynamics Simulations

A review on the role of interface in mechanical, thermal, and electrical properties of polymer composites

Buckling modes of elastic thin films on elastic substrates

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