Abstract
Nanomechanical definition of the properties of composite specimens based on polylactic acid (PLA) was made in the present study. Research activities with accent on biodegradable polymer nanocomposites have fundamental significance originated from the worldwide plastic waste pollution. To receive hybrid nanocomposites with high level of homogeneity, the low cost and environmentally friendly melt extrusion method has been applied. The role of graphene nanoplatelets (GNPs) and multiwall carbon nanotubes (MWCNTs) as reinforcing nanoparticles dispersed in the polymer matrix was thoroughly investigated. Quasi-static nanoindentation analysis was enriched by performance of accelerated property mapping and nanodynamic mechanical testing in order to fully describe the nanoscale surface homogeneity and stress relaxation behavior of the nanocomposite specimens. That novelty of the research approach had a well-marked contribution over the detection of the new samples’ nanomechanical features as a function of the type of carbon nanofiller. Refined nanoscratch experiments uncovered the resistance of the materials against notches by means of measurement of the coefficient of friction and accurate estimation of the residual penetration depth.
Highlights
Nowadays, the nanomechanical test methods present one of the main solution for surface characterization of polymeric films and coatings [1,2,3,4]
Use of biodegradable polymer matrix as polylactic acid [5] has to be encouraged because it is a fair green alternative of the enormous quantity of plastic waste that is thrown out every day all over the earth
graphene nanoplatelets (GNPs) and multiwall carbon nanotubes (MWCNTs) mixed in a polymer matrix can be ascertained only by blending of several advanced experimental approaches based on nanoscale indentation and scratch
Summary
The nanomechanical test methods present one of the main solution for surface characterization of polymeric films and coatings [1,2,3,4]. Numerous advantages of melt extrusion manufacturing method of nanocomposite materials with respect to attainment of better carbon nanoparticles dispersion have been already highlighted [6]. Composite specimens, prepared by melt blending, are investigated in order to see the effect of reinforcing nanoparticles on the crystallization kinetics of PLA die which is linked to the mechanical behavior and degradation rate of the samples [7]. The quality and the reliability of these advanced materials including the strengthening effect of GNPs and MWCNTs mixed in a polymer matrix can be ascertained only by blending of several advanced experimental approaches based on nanoscale indentation and scratch. Dynamic and static nanomechanical properties investigation of chemically modified claypolymer nanocomposite revealed positive effect of both organic agents and clay loading on key parameters as elastic modulus, storage modulus, loss modulus, and loss factor [8]
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