Journal
NANOSCALE RESEARCH LETTERS
Volume 16, Issue 1, Pages -Publisher
SPRINGER
DOI: 10.1186/s11671-021-03568-1
Keywords
Low density polyolefin; PeakForce quantitative nanomechanical mapping; Fast force volume; Young's modulus; DMT model; Atomic force microscopy
Funding
- Natural Science Foundation of China [21807026, 82003585]
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This study utilized advanced nanomechanical mapping techniques to investigate the time-dependent elastic moduli of LDPE samples, revealing an increase in Young's modulus with increasing acquisition frequency. Additionally, creep compliance experiments demonstrated various mechanical properties of LDPE.
Elastomeric nanostructures are normally expected to fulfill an explicit mechanical role and therefore their mechanical properties are pivotal to affect material performance. Their versatile applications demand a thorough understanding of the mechanical properties. In particular, the time dependent mechanical response of low-density polyolefin (LDPE) has not been fully elucidated. Here, utilizing state-of-the-art PeakForce quantitative nanomechanical mapping jointly with force volume and fast force volume, the elastic moduli of LDPE samples were assessed in a time-dependent fashion. Specifically, the acquisition frequency was discretely changed four orders of magnitude from 0.1 up to 2 k Hz. Force data were fitted with a linearized DMT contact mechanics model considering surface adhesion force. Increased Young's modulus was discovered with increasing acquisition frequency. It was measured 11.7 +/- 5.2 MPa at 0.1 Hz and increased to 89.6 +/- 17.3 MPa at 2 kHz. Moreover, creep compliance experiment showed that instantaneous elastic modulus E-1, delayed elastic modulus E-2, viscosity eta, retardation time tau were 22.3 +/- 3.5 MPa, 43.3 +/- 4.8 MPa, 38.7 +/- 5.6 MPa s and 0.89 +/- 0.22 s, respectively. The multiparametric, multifunctional local probing of mechanical measurement along with exceptional high spatial resolution imaging open new opportunities for quantitative nanomechanical mapping of soft polymers, and can potentially be extended to biological systems.
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