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Thermal expansion of isotactic polypropylene Part I: temperature-dependent contributions of thermal expansions in its amorphous and crystalline phases

Polymer Journal volume 55, pages 1327–1334 (2023)Cite this article

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Abstract

In this study, the nature of the linear thermal expansion of injection-molded isotactic polypropylene (iPP) was investigated by temperature-variable small-angle X-ray scattering (SAXS) and wide-angle X-ray scattering (WAXS) techniques. The analysis of the temperature-variable SAXS data was based on the Strobl-Schneider method, and the results provided the temperature dependence along the lengths of the long periods of the iPP lamellae and amorphous layers. Based on these values, the corresponding coefficient of linear thermal expansion (CLTE) αam for the length of the amorphous layer was obtained. The results of temperature-variable WAXS revealed that the iPP had a monoclinic α-form. In addition, the reflection peak corresponding to each crystal plane in the unit cell shifted with increasing temperature, which indicated that the lattice constants, especially the length of each crystal axis, the a-, b-, and c-axes, varied. The CLTE αa, αb, and αc values corresponding to each a-, b- and c-axis were obtained. Combining αam with αa, αb, and αc and information on the orientation of the iPP crystal, i.e., the mean squared cosine <cos2ωa, b, c> provided the total CLTE αcr+am, which allowed thermal expansion to occur in both crystalline and amorphous layers. The resulting αcr+am was in good agreement with the bulk CLTE. Furthermore, αam /αcr+am was >0.99. The linear thermal expansion of the iPP was governed only by the linear thermal expansion of its amorphous layer.

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References

  1. Moore Jr EP. Polypropylene Handbook. Münich: Carl Hanser Verlag GmbH&Co; 1996.

  2. Fujita Y. Development of automotive polypropylene. Miraizairyo. 2005;5:9–13.

    CAS  Google Scholar 

  3. Brandup J, Immergut EH. Polymer Handbook. 3rd ed. New York: Wiley; 1989.

  4. Ushigi H, Sato T, Hashitani T. Kagau Binran Kisohen II. Tokyo: Maruzen; 1993.

  5. Choy CL, Chen FC, Young K. Negative thermal expansion in oriented crystalline polymers. J Polym Sci Polym Phys Ed. 1981;19:335–52.

    Article  CAS  Google Scholar 

  6. Choy CL, Ito Y, Porter RS. Thermal expansivity of oriented poly(ethylene terephthalate). J Polym Sci Polym Phys Ed. 1983;21:1427–38.

    Article  CAS  Google Scholar 

  7. Choy CL, Chen FC, Ong EL. Anisotropic thermal expansion of oriented crystalline polymers. Polymer. 1979;20:1191–8.

    Article  CAS  Google Scholar 

  8. Burkley CP. Elastic and thermal expansion anisotropy of oriented linear polyethylene. J Mater Sci. 1974;9:100–8.

    Article  Google Scholar 

  9. Burkley CP, Mccrum NG. The thermal expansion of single-crystal texture linear polyethylene between 0 and −190 oC. J Mater Sci. 1973;8:1123–35.

    Article  Google Scholar 

  10. Davis GT, Eby RK, Colson JP. Thermal expansion of polyethylene unit cell: effect of lamella thickness. J Appl Phys. 1970;41:4316–26.

    Article  CAS  Google Scholar 

  11. Albrecht T, Strobl G. Temperature-dependent crystalline-amorphous structures in linear polyethylene: surface melting and the thickness of the amorphous layers. Macromolecules. 1995;28:5827–33.

    Article  CAS  Google Scholar 

  12. Chen HL, Liu HH, Lin JS. Microstructure of semicrystalline poly(L-lactide)/poly(4-vinylphenol) blends evaluated from SAXS absolute intensity measurement. Macromolecules. 2000;33:4856–60.

    Article  CAS  Google Scholar 

  13. Strobl GR, Schneider M. Direct evaluation of the electron density correlation function of partially crystalline polymers. J Polym Sci Polym Phys Ed. 1980;18:1343–59.

    Article  CAS  Google Scholar 

  14. Kantz MR, Newman HD Jr, Stigale FH. The skin-core morphology and structure–property relationships in injection-molded polypropylene. J Appl Polym Sci. 1972;16:1249–60.

    Article  CAS  Google Scholar 

  15. Ran S, Zong X, Fang D, Hsiao BS, Chu B, Phillips R. Structural and morphological studies of isotactic Polypropylene fibers during heat/draw deformation by in-situ synchrotron SAXS/WAXD. Macromolecules. 2001;34:2569–78.

    Article  CAS  Google Scholar 

  16. Strobl GR. The physics of polymers. Chapter 4. Berlin: Springer Verlag; 1997.

  17. Stehling FC, Mandelkern L. The glass temperature of linear polyethylene. Macromolecules. 1970;3:242–52.

    Article  CAS  Google Scholar 

  18. Fujiyama M, Wakino T, Kawasaki Y. Structure of skin layer in injection-molded polypropylene. J Appl Polym Sci. 1988;35:29–49.

    Article  CAS  Google Scholar 

  19. Lotz B, Wittmann JC. The molecular origin of lamellar branching in the α (monoclinic) form of isotactic polypropylene. J Polym Sci B Poly Phys. 1986;24:1541–58.

    Article  CAS  Google Scholar 

  20. Alexander LE. X-ray diffraction methods in polymer science. New York: John Wiley & Sons; 1969.

  21. Yamada K, Matsumoto S, Tagashira K, Hikosaka M. Isotacticity dependence of spherulitic morphology of isotactic polypropylene. Polymer. 1998;39:5327–33.

    Article  CAS  Google Scholar 

  22. Gu F, Hikosaka M, Toda A, Gosh SK, Yamazaki S, Arakaki M, et al. Second order phase transition of high isotactic polypropylene at high temperature. Polymer. 2002;43:1473–81.

    Article  CAS  Google Scholar 

  23. Napolitano R, Pirozzi B, Varriale V. Temperature dependence of the thermodynamic stability of the two crystalline α forms of the isotactic polypropylene. J Polym Sci B Polym Phys. 1990;28:139–47.

    Article  CAS  Google Scholar 

  24. Ono M, Washiyama J, Nakajima K, Nishi T. 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 

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Acknowledgements

This study was conducted at SPring-8 using the BL19B2 beamline (proposal No2015A1948). The author wishes to thank Dr Masugu Sato and Dr Norimichi Sano at SPring-8 for their support of the SAXS and WAXS measurements and to SunAllomer Ltd. for supplying SunAllomer PM900A isotactic polypropylene.

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  1. MONO Polymer Research Ltd, 1-22-51, Ushikubo, Tsuzuki-ku, Yokohoma-shi, Kanagawa-ken, 224-0012, Japan

    Michio Ono

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Ono, M. Thermal expansion of isotactic polypropylene Part I: temperature-dependent contributions of thermal expansions in its amorphous and crystalline phases. Polym J 55, 1327–1334 (2023). https://doi.org/10.1038/s41428-023-00834-0

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