Mechanical Properties and Higher-Order Structures of Biaxially Drawn Bacterial Poly[(R)-3-hydroxybutyrate-co-(R)-3-hydroxyhexanote] Films

Jae-Chang Lee; Nobuki Kato; Shinichi Sakurai; Hideki Yamane

Macromolecular Research, Vol.20, No.1, 37-43, January, 2012

DOI10.1007/s13233-012-0015-4 Export Citation

Mechanical Properties and Higher-Order Structures of Biaxially Drawn Bacterial Poly[(R)-3-hydroxybutyrate-co-(R)-3-hydroxyhexanote] Films

Jae-Chang Lee, Nobuki Kato¹, Shinichi Sakurai¹, and Hideki Yamane^{1, †}

Center for Fiber & Textile Science, Kyoto Institute of Technology, Kyoto, 606-8585, Japan
¹Graduate School of Science and Technology, Kyoto Institute of Technology, Kyoto, 606-8585, Japan

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Bacterial poly(3-hydroxybutyrate-co-hydroxyhexanoate) (PHBH) biaxially oriented films were prepared by combination of the roll and biaxial drawing processes. Compression molded films, which consisted of large spherulite aggregation, were roll drawn up to ×1.4 and further biaxially drawn up to 3.0×3.0. The tensile modulus and the break elongation decreased while the tensile strength increased as the biaxial draw ratio increased. Biaxially drawn films showed two kinds of structures: one in which the c-axis was almost perpendicular to the film surface and the other in which the c-axis was at an incline compared to the normal film surface. The correlation among the processing conditions, higher-order structures, and mechanical properties was investigated using wide-angle X-ray diffraction, small-angle X-ray scattering, and tensile measurements.

Keywords:bacterial copolyester;roll drawing;biaxial drawing.

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[2] Doi Y, Microbial Polyesters, VCH Publishers, New York (1990)

[3] Anderson AJ, Dawes EA, Microbiol Rev., 54, 450 (1990)

[4] Holmes PA, in Developments in crystalline polymers, Bassett, Ed., Elsevier Applied Science Publishers, London and New York, 2, 1 (1988)

[5] Ellar D, Lundgren DG, Okamura K, Marchessalt RH, J. Mol. Biol., 35, 489 (1968)

[6] De Koning GJM, Lemstra PJ, Polymer., 34, 4089 (1993)

[7] Scandola M, Ceccorulli G, Pizzoli M, Macromol. Chem.Rapid Commun., 10, 47 (1989)

[8] Lee JC, Furuhashi Y, Kawahara Y, Yamane H, Sen’i Gakkaishi., 62, 219 (2006)

[9] Lee JC, Yasui A, Jeong Y, Sakurai S, Yamane H, Polymer, 49(9), 2362 (2008)

[10] Furuhashi Y, Ito H, Kikutani T, Yamamoto T, Kimizu M, Sen’i Gakkaishi., 53, 356 (1997)

[11] Barham PJ, Keller A, J. Polym. Sci. Part B: Polym.Phys., 24, 69 (1986)

[12] Yamamoto T, Kimizu M, Kikutani T, Furuhashi Y, Cakmak M, Int. Polym. Process., 12(1), 29 (1997)

[13] Furuhashi Y, Imamura Y, Jikihara Y, Yamane H, Polymer, 45(16), 5703 (2004)

[14] Orts WJ, Marchessault RH, Bluhm TL, Hamer GK, Macromolecules., 23, 5368 (1990)

[15] Samuels RJ, Structured polymer properties, Wiley-Interscience, New York,Chapter 2. (1974)

[16] Stachurski ZH, Ward IM, J. Macromol. Sci. Phys., B3, 445 (1969)

[17] Sakurai S, Aida S, Okamoto S, Sakurai K, Nomura S, Macromolecules, 36(6), 1930 (2003)

[18] Hibi S, Fujita K, Maeda M, Kakizawa T, Imada K, Takino K, Sen’i Gakkaishi., 36, 371 (1980)