TY - GEN
T1 - Processing, mechanical properties, and structure analysis of melt-spun fibers of P(3HB)/UHMW-P(3HB) identical blend
AU - Kabe, Taizo
AU - Tsuge, Takeharu
AU - Hikima, Takaaki
AU - Takata, Masaki
AU - Takemura, Akio
AU - Iwata, Tadahisa
PY - 2012
Y1 - 2012
N2 - High tensile strength melt-spun fibers of poly[(R)-3-hydroxybutyrate] (P(3HB)) with the addition of a small amount of ultra-high-molecular-weight P(3HB) (UHMW-P(3HB)) were processed by cold-drawing and two-step cold-drawing methods. The mechanical properties and highly ordered structure were investigated by tensile testing, and wide-angle and small-angle X-ray diffraction measurements (WAXD and SAXS) using a synchrotron radiation beam at SPring-8. The molecular weight of P(3HB) decreased drastically within a few minutes during melt-spinning. However, in the case of the blended samples, the degree of molecular weight decrease was slightly reduced by the addition of UHMW-P(3HB). The melt-spun blend fibers stretched at a cold-drawing ratio of 14 showed a tensile strength of 530 MPa. When two-step cold-drawing was applied, the tensile strength increased further to 740 MPa. WAXD and SAXD revealed that the addition of a small amount of UHMW-P(3HB) into P(3HB) induces the formation of the β-form (planar zigzag conformation) of molecular chain, increasing the mechanical properties. Based on these results, it seems that the addition of a small amount of UHMW-P(3HB) has a great effect on the thermal stability and processability of melt-spun fibers and increases their final mechanical properties.
AB - High tensile strength melt-spun fibers of poly[(R)-3-hydroxybutyrate] (P(3HB)) with the addition of a small amount of ultra-high-molecular-weight P(3HB) (UHMW-P(3HB)) were processed by cold-drawing and two-step cold-drawing methods. The mechanical properties and highly ordered structure were investigated by tensile testing, and wide-angle and small-angle X-ray diffraction measurements (WAXD and SAXS) using a synchrotron radiation beam at SPring-8. The molecular weight of P(3HB) decreased drastically within a few minutes during melt-spinning. However, in the case of the blended samples, the degree of molecular weight decrease was slightly reduced by the addition of UHMW-P(3HB). The melt-spun blend fibers stretched at a cold-drawing ratio of 14 showed a tensile strength of 530 MPa. When two-step cold-drawing was applied, the tensile strength increased further to 740 MPa. WAXD and SAXD revealed that the addition of a small amount of UHMW-P(3HB) into P(3HB) induces the formation of the β-form (planar zigzag conformation) of molecular chain, increasing the mechanical properties. Based on these results, it seems that the addition of a small amount of UHMW-P(3HB) has a great effect on the thermal stability and processability of melt-spun fibers and increases their final mechanical properties.
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U2 - 10.1021/bk-2012-1105.ch005
DO - 10.1021/bk-2012-1105.ch005
M3 - Conference contribution
AN - SCOPUS:84891827140
SN - 9780841227675
T3 - ACS Symposium Series
SP - 63
EP - 75
BT - Biobased Monomers, Polymers, and Materials
PB - American Chemical Society
ER -