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. 2023 Jun 15;8(25):22827-22835.
doi: 10.1021/acsomega.3c01772. eCollection 2023 Jun 27.

Polypropylene Blends for Highly Drawn Tapes with Improved Toughness

László József Varga  1 , Ákos Görbe  1 , Tamás Bárány  1   2
Affiliations

Polypropylene Blends for Highly Drawn Tapes with Improved Toughness

László József Varga et al. ACS Omega. .

Abstract

In this study, we used four amorphous poly-alpha-olefin (APAO) grades to improve the toughness of drawn polypropylene (PP) tapes. The samples containing different amounts of APAOs were drawn in a heat chamber of a tensile testing machine. The APAOs reduced the work of drawing and increased the melting enthalpy of the drawn specimens, as they facilitated the movement of the PP molecules. The APAO with the highest molecular weight and with a low level of crystallinity increased both the tensile strength and the strain-at-break of the specimens, so we also produced drawn tapes from that PP/APAO blend on a continuous-operation stretching line. The continuously drawn tapes also showed improved toughness.

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Conflict of interest statement

The authors declare no competing financial interest.

Figures

Figure 1
Figure 1
Specimens used in the drawing process.
Figure 2
Figure 2
Schematic figure of the drawing line.
Figure 3
Figure 3
Typical drawing curves of PP/VP708 (a), PP/VP750 (b), PP/VP792 (c), and PP/VP888 (d) blends.
Figure 4
Figure 4
Specific work of drawing of the blends containing 10 (a) and 15 wt % APAO (b).
Figure 5
Figure 5
DSC curves from the first heating of the PP/VP708 and PP/VP888 blends with different draw ratios (a) and second heating curves of the blends (b).
Figure 6
Figure 6
Crystalline melting temperatures (a) and crystallinity values (b) of the drawn PP/VP708 and PP/VP888 blends with different draw ratios.
Figure 7
Figure 7
Typical tensile curves of plain PP (a), PP/VP708 blends with the additive content of 10 wt % at different draw ratios (b), and PP/VP708 blends with different APAO contents with the draw ratio of λ = 10 (C).
Figure 8
Figure 8
Tensile modulus (a), tensile strength (b), and strain-at-break (c) of the drawn PP/APAO blends with different draw ratios.
Figure 9
Figure 9
Typical tensile curves of the drawn tapes with different APAO content at the draw ratio of λ = 8 (a), λ = 10 (b), and λ = 12 (c).
Figure 10
Figure 10
Tensile modulus (a), tensile strength (b), and strain-at-break (c) of the drawn PP/VP888 tapes at different draw ratios.
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References

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