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Influence of thermal treatment on the elastic modulus of a nano-dispersed elastomer domain in an injection-molded isotactic polypropylene/thermoplastic elastomer binary blend

Polymer Journal volume 56, pages 87–96 (2024)Cite this article

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Abstract

Here, the nano-scale elastic modulus of a phase-separated polyolefin blend consisting of isotactic polypropylene (iPP) and ethylene-co-octene rubber (EO) was investigated using atomic force microscopy (AFM). We investigated the elastic modulus of the EO domain for the injection-molded specimens with three different annealing temperatures: without further annealing (“as-is”), 100 °C annealing (“100 °C”), and 155 °C annealing (“155 °C”). The shapes of the EO domains of those specimens were observed as fibrous and highly oriented along the flow direction. However, the elastic moduli of the EO domains were distributed differently depending upon their annealing temperatures. The elastic modulus in the “as-is” sample was distributed from 2 to >50 MPa, with higher modulus EO domains (>10–50 MPa) than the inherent elastic modulus of the EO. These domains were supposed to be derived from the high-stress EO domain based on the negative pressure accumulated inside the fibrous EO domain, which is attributed to the elongated and tense EO molecules. The 100 °C specimen, with an annealing temperature that was much higher than the melting point of the EO, still contained many higher elastic modulus EO domains, demonstrating that the 100 °C annealing temperature was still insufficient to remove the stress inside these EO domains. Finally, the 155 °C sample did not show any higher modulus EO domains, and its elastic modulus distribution became closer to that of the inherent EO.

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References

  1. Moore Jr EP. Polypropylene Handbook. Car Hanser Verlag, Münich, Germany, 1996.

  2. Grein C, Bernreitner K, Hauer A, Gahleitner M, Neißl W. Impact modified isotatic polypropylene with controlled rubber intrinsic viscosities: some new aspects about morphology and fracture. J Appl Polym Sci. 2003;87:1702–12.

    Article  CAS  Google Scholar 

  3. JSR Co., Ltd., Japanese Patent JP2001-172335A.

  4. Ono M, Washiyama J, Nakajima K, Nishi T. Polymer. Anisotropic thermal expansion in polypropylene/poly(ethylene-co-octene) binary blends: influence of arrays of elastomer domains. Polymer. 2005;46:4899–908.

    Article  CAS  Google Scholar 

  5. Yasuda T. Automotive and plastics. JETI 2002;50:35–9.

    Google Scholar 

  6. Levinson R, Pan H, Ban Weiss G, Rosado P, Paolini R, Akbari H. Potential benefits of solar reflective car shells: cooler cabins, fuel savings and emission reductions. Appl Energy. 2011;88:4343–57.

    Article  CAS  Google Scholar 

  7. Li X, Wu H, Han L, Hunag T, Wang Y, Bai H, et al. Annealing induced microstructure and fracture resistance changes in isotactic polypropylene/ethylene-octene copolymer blends with and without β-phase nucleating agent. J Polym Sci Part B Polym Phys. 2010;48:2108–20.

    Article  CAS  Google Scholar 

  8. Poussin L, Bertin YA, Parisot J, Brassy C. Influence of thermal treatment on the structure of an isotactic polypropylene. Polymer 1998;39:4261–5.

    Article  CAS  Google Scholar 

  9. Yu B, Geng C, Zhou M, bai H, Fu Q, He B. Impact toughness of polypropylene/glass fiber composites: Interplay between intrinsic toughening and extrinsic toughening. Compos Part B: Eng. 2016;92:413–9.

    Article  CAS  Google Scholar 

  10. Hikosaka M, Seto T. The order of the molecular chains in isotactic polypropylene crystals. Polym J. 1973;5:111–27.

    Article  CAS  Google Scholar 

  11. Craig J, Carriere H, Craig S. The effects of short-chain branching and comonomer type on the interfacial tension of polypropylene-polyolefin elastomer blends. J Appl Polym Sci. 1997;66:1175–81.

    Article  Google Scholar 

  12. Charfeddine I, Majesté JC, Carrot C, Lhost O. Surface tension and interfacial tension of polyolefins and polyolefin blends. J Appl Polym Sci. 2022;139:51885.

    Article  CAS  Google Scholar 

  13. Freger V. Swelling and morphology of the skin layer of polyamide composite membranes: an atomic force microscopy study. Environ Sci Technol. 2004;38:3168–75.

    Article  CAS  PubMed  Google Scholar 

  14. Coffey DC, Reid OG, Rodovsky DB, Bartholomew GP, Ginger DS. Mapping local photocurrents in polymer/fullerene solar cells with photoconductive atomic force microscopy. Nano Lett. 2007;7:738–44.

    Article  CAS  PubMed  Google Scholar 

  15. Liu H, Liang X, Nakajima K. Nanoscale strain–stress mapping for a thermoplastic elastomer revealed using a combination of in situ atomic force microscopy nanomechanics and Delaunay triangulation. Nanorheological analysis of polymer surfaces by atomic force microscopy. J Polym Sci. 2022;20:3134–40.

    Article  Google Scholar 

  16. Liang X, Miyafuji K, Hara K, Mogi K, Nishida R, Liu H, et al. Direct visualization of stretch-induced phase separation in methoxy silyl-terminated polypropylene oxide/epoxy resin-type polymer alloys via AFM nanomechanics: a toughening mechanism. Polymer 2022;259:125343.

    Article  CAS  Google Scholar 

  17. Nguyen HK, Aoki M, Liang X, Yamamoto S, Tanaka K, Nakajima K. Local mechanical properties of heterogeneous nanostructures developed in a cured epoxy network: implications for innovative adhesion technology. ACS Appl Nano Mater. 2021;4:12188–96.

    Article  CAS  Google Scholar 

  18. Rixman MA, Dean D, Macias C, Ortiz C. Nanoscale intermolecular interactions between human serum albumin and alkanethiol self-assembled monolayers. Langmuir 2003;19:6202–18.

    Article  CAS  Google Scholar 

  19. Ortiz C, Hadziioannou G. Entropic elasticity of single polymer chains of poly(methacrylic acid) measured by atomic force microscopy. Macromolecules 1999;32:780–7.

    Article  CAS  Google Scholar 

  20. Al-Mawaali S, Bemis J, Akhremitchev BB, Janesko B, Walker GC. Study of the polydispersity of grafted poly(dimethylsiloxane) surfaces using single-molecule atomic force microscopy. J Phys Chem B. 2001;105:3965–71.

    Article  Google Scholar 

  21. Pavoor PV, Bellare A, Storm A, Yang D, Cohen RE. Mechanical characterization of polyelectrolyte multilayers using quasi-static nanoindentation. Macromolecules. 2004;37:4865–71.

    Article  CAS  Google Scholar 

  22. Vanlandingham MR, Mcknight SH, Plamese GR, Elings JR, Huang X, Bagetti TA, et al. Nanoscale indentation of polymer systems using the atomic force microscope. J Adhes. 1997;64:31–59.

    Article  CAS  Google Scholar 

  23. Akhremitchev BB, Walker GC. Finite sample thickness effects on elasticity determination using atomic force microscopy. Langmuir. 1999;15:5630–4.

    Article  CAS  Google Scholar 

  24. Nakajima K, Fujinami S, Nukaga H, Watabe H, Kitano H, Ohno N, et al. Nanorheology mapping by atomic force microscopy. Kobunshi Ronbunshu. 2005;62:476–87.

    Article  CAS  Google Scholar 

  25. Cappella B, Kaliappan SK, Sturm H. Using AFM force-distance curves to study the glass-to-rubber transition of amorphous polymers and their elastic-plastic properties as a function of temperature. Macromolecules. 2005;36:1874–81.

    Article  Google Scholar 

  26. Tomasetti E, Legras R, Nysten B. Quantitative approach towards the measurement of polypropylene/(ethylene-propylene) copolymer blends surface elastic properties by AFM. Nanotechnology. 1998;9:305–15.

    Article  CAS  Google Scholar 

  27. Hertz H. Uber die beruhrung fester elastischer. J Reine Angew Math. 1882;92:156–71.

    Article  Google Scholar 

  28. Johnson KL, Kendall K, Roberts AD. Surface energy and the contact of elastic solids. Proc R Soc Lond Ser A. 1971;324:301–13.

    Article  CAS  Google Scholar 

  29. Liu H, Chen N, Fujinami S, Louzguine-Luzgin D, Nakajima K, Toshio N. Quantitative nanomechanical investigation on deformation of poly(lactic acid). Macromolecules .2012;45:8770–9.

    Article  CAS  Google Scholar 

  30. Sun Y, Akhremitchev BB, Walker GL. Using the adhesive interaction between atomic force microscopy tips and polymer surfaces to measure the elastic modulus of compliant samples. Langmuir .2004;20:5837–45.

    Article  CAS  PubMed  Google Scholar 

  31. Liang X, Nakajima K. Study of the Mullins effect in carbon black-filled styrene-butadiene rubber by atomic force microscopy nanomechanics. Macromolecules 2022;55:6023–30.

    Article  CAS  Google Scholar 

  32. Wang D, Liang X, Russell TP, Nakajima K. Visualization and quantification of the chemical and physical properties of a diffusion-induced interface using AFM nanomechanical mapping. Macromolecules .2014;47:3761–5.

    Article  CAS  Google Scholar 

  33. Nukaga H, Fujinami S, Watabe H, Nakajima K, Nishi T. Nanorheological analysis of polymer surfaces by atomic force microscopy. Jpn J Appl Phys. 2005;44:5425–9.

    Article  CAS  Google Scholar 

  34. Nakajima K, Ito M, Wang D, Liu H, Nguyen HK, Liang X, et al. Nano-palpation AFM and its quantitative mechanical property mapping. Microscopy .2014;63:193–208.

    Article  CAS  PubMed  Google Scholar 

  35. Ono M, Washiyama J, Nakajima K, Nishi T. Anisotripic thermal expansion in polypropylene/poly(ethylene-co-octene) binary blends : influenece of arrays of elastomer domains. Polymer .2005;46:4899–908.

    Article  CAS  Google Scholar 

  36. Atsumi T, Nishitsuji S, Inoue T, Kobayashi S. Structure-proerties of a super ductile nylon alloy. Kobunshi Ronbunshu. 2011;68:616–22.

    Article  CAS  Google Scholar 

  37. Moffitt M, Rharbi Y, Chen W, Tong JD, Winnik MA, Thurman DW, et al. Stratified morphology of a polypropylene/elastomer blend following channel flow. J Polym Sci : Polym Phys Ed. 2002;40:2842–59.

    Article  CAS  Google Scholar 

  38. Chang YW, Lee Y. Preparation and properties of polyethylene-octene elastomer (POE)/organoclay nanocomposites. Polym Bull. 2012;68:483–92.

    Article  CAS  Google Scholar 

  39. Lim JY, Hassan A, Rahmat AR, Wahit MU. Morphology, thermal and mechanical behavior of polypropylene nanocomposites toughened with poly(ethylene-co-octene). Polym Int. 2006;55:204–15.

    Article  CAS  Google Scholar 

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Acknowledgements

The authors wish to thank SunAllomer Ltd. for supplying iPP samples and for supporting the blend sample and plaque preparation.

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  1. Department of Organic and Polymeric Materials, Faculty of Engineering, Tokyo Institute of Technology, 1-12-1, Ookayama, Meguro-ku, Tokyo, 152-8552, Japan

    Michio Ono & Ken Nakajima

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  1. Michio Ono
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Correspondence to Michio Ono.

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Ono, M., Nakajima, K. Influence of thermal treatment on the elastic modulus of a nano-dispersed elastomer domain in an injection-molded isotactic polypropylene/thermoplastic elastomer binary blend. Polym J 56, 87–96 (2024). https://doi.org/10.1038/s41428-023-00844-y

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