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. 2022 Jan 21;14(3):434.
doi: 10.3390/polym14030434.

A Study of the Flexural Properties of PA12/Clay Nanocomposites

Josip Stojšić  1 , Pero Raos  1 , Andrijana Milinović  1 , Darko Damjanović  1
Affiliations

A Study of the Flexural Properties of PA12/Clay Nanocomposites

Josip Stojšić et al. Polymers (Basel). .

Abstract

Polymer nanocomposites consist of a polymer matrix and reinforcing particles that have at least one dimension under 100 nm. The processing of nanocomposite polymers is the most important stage, determining the final properties of nanocomposites. Nanocomposites are now preferentially prepared by melt-mixing using conventional compounding processes such as twin-screw extrusion. Many processing parameters (polymer matrix type, content and type of nanofiller, barrel temperature, screw speed, number and shape of extruder screws, etc.) affect the properties of nanocomposites. This research work represents an investigation of the influence of processing parameters (amount of nanoclay filler, the screw rotation speed, and extruder barrel temperature) on the flexural properties of polyamide 12/nanoclay-reinforced nanocomposite. From the test results, it is apparent that an increase in nanoclay content from 1 to 8% significantly increases flexural strength. The obtained nanocomposite has a 19% higher flexural strength and a 56% higher flexural modulus than pure PA12. Mathematical models that show the dependence of flexural strength and flexural modulus on the processing parameters used were obtained as a result of this analysis.

Keywords: clay; mechanical properties; mixing; nanocomposites; polyamide 12.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Position of test specimen at the start of the test [37].
Figure 2
Figure 2
XRD diffractograms of PA12 and PA12/Cloisite 93A specimens.
Figure 3
Figure 3
SEM micrographs of (a) specimens made according to experiment No. 1, (b) specimens made according to experiment No. 5, (c) specimens made according to experiment No. 8, and (d) specimens made according to experiment No. 9.
Figure 4
Figure 4
SEM micrograph of specimen made of pure PA12.
Figure 5
Figure 5
Flexural stress/strain plot for all experiments.
Figure 6
Figure 6
Response surface of reduced quadratic regression model: flexural strength.
Figure 7
Figure 7
Contour view of reduced quadratic regression model: flexural strength.
Figure 8
Figure 8
Response surface of reduced linear regression model: flexural modulus.
Figure 9
Figure 9
Contour view of reduced quadratic regression model: flexural strength.
See this image and copyright information in PMC

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