Mechanical properties and enzymatic degradation of poly[(R)-3-hydroxybutyrate] fibers stretched after isothermal crystallization near Tg

Tanaka, Toshihisa; Yabe, Tomomi; Teramachi, Shinya; Iwata, Tadahisa

doi:10.1016/j.polymdegradstab.2007.02.017

Cited by 57 publications

(54 citation statements)

References 22 publications

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“…The tensile strength of the fibers crystallized over a period of 0-24 h remained constant. However, the tensile strength of the fibers increased drastically when the crystallization time was prolonged Tanaka et al 2007c. Copyright 2007 to more than 24 h. The tensile strength of the fibers crystallized for 72 h increased to 740 MPa.…”

Section: Processing and Mechanical Propertiesmentioning

confidence: 99%

“…However, the maximum draw ratio of the amorphous commercial-P(3HB) fibers decreased with increasing crystallization time. This value was constant at about four times with a crystallization time of over 40 h. Figure 4 shows the changes in the tensile strength of four times one-step-drawn commercial-P(3HB) fibers against the isothermal crystallization time (Tanaka et al 2007c). The tensile strength of the fibers crystallized over a period of 0-24 h remained constant.…”

Section: Processing and Mechanical Propertiesmentioning

confidence: 99%

“…The isothermal crystallization time of over 24 h is thought to be necessary to generate sufficient small crystal nuclei throughout the fiber. The mechanical properties of one-step-drawn fibers of commercial P(3HB) and UHMW-P(3HB) at each isothermal crystallization time are summarized in Table 3 (Tanaka et al 2007c). The mechanical properties of onestep-drawn commercial-P(3HB) fibers were higher than in the case of UHMW-P(3HB) fibers.…”

Section: Processing and Mechanical Propertiesmentioning

confidence: 99%

“…The mechanical properties of one-step-drawn P(3HB-co-3HV) fibers without and after isothermal crystallization are summarized in Table 4. The Table 3 Mechanical properties of one-step-drawn P(3HB) fibers after isothermal crystallization near the glass-transition temperature (Tanaka et al 2007c Table 4 Mechanical properties of one-step-drawn P(3HB-co-3HV) fibers after isothermal crystallization near the glass-transition temperature Draw ratio tensile strength of as-spun fibers was about 30 MPa independent of isothermal crystallization. The tensile strength of ten times one-step-drawn fiber without isothermal crystallization was 90 MPa.…”

Section: Processing and Mechanical Propertiesmentioning

confidence: 99%

“…1a). More recently, we developed a new drawing technique (one-step drawing after isothermal crystallization) to obtain strong fibers from normal molecular weight (commercial grade molecular weight) P(3HB) (Tanaka et al 2007c) and poly[(R)-3-hydroxybutyrate-co-(R)-3-hydroxyvalerate], P(3HB-co-3HV) Fig. 1b).…”

Section: Introductionmentioning

confidence: 99%

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Poly[(R)-3-hydroxybutyrate] and its copolymers have not been recognized as practical because of its stiffness and brittleness. Recently, we succeeded in obtaining strong fibers by two kinds of new drawing techniques from microbial polyesters produced by both wild-type and recombinant bacteria. The improvement of the mechanical properties of fibers is due not only to the orientation of the molecular chains but is also due to the generation of a planar zigzag conformation. The highly ordered and inner structures of strong fibers with tensile strength of over 1.0 GPa were analyzed by microbeam X-ray diffraction and X-ray microtomography

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Section: Processing and Mechanical Propertiesmentioning

confidence: 99%

Section: Processing and Mechanical Propertiesmentioning

confidence: 99%

Section: Processing and Mechanical Propertiesmentioning

confidence: 99%

Section: Processing and Mechanical Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Biodegradability and/or Compostability?

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Morphologies and electrical properties of electrospun poly[(R)‐3‐hydroxybutyrate‐co‐(R)‐3‐hydroxyvalerate]/ multiwalled carbon nanotubes fibers

Chan

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J of Applied Polymer Sci

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Electrospinning process was used to fabricate fine fibers from poly[(R)-3-hydroxybutyrate-co-(R)-3hydroxyvalerate] embedded with multiwalled carbon nanotubes (MWCNTs). Rotating disc collector was used to provide additional drawing force to stretch and align both the embedded MWCNTs and electrospun fibers themselves.Morphological observation revealed MWCNTs aligned to the fiber axis and protruding from the surface. To understand the electrical properties of the fiber, a single-composite fiber has been deposited on a substrate, across multiple electrodes. Electrical conductiv-ity of the single-electrospun fiber with low MWCNT content of 0.2 wt % was calculated to be in a remarkable magnitude of about 2.07 Sm À1 . Electrical current flow spanning the fiber length of 1400 lm indicates that the presence of an interconnected network of MWCNTs exists within the fiber.

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Mechanical properties and enzymatic degradation of poly[(R)-3-hydroxybutyrate] fibers stretched after isothermal crystallization near Tg

Cited by 57 publications

References 22 publications

Manufacturing of PHA as Fibers

Manufacturing of PHA as Fibers

Biodegradability and/or Compostability?

Morphologies and electrical properties of electrospun poly[(R)‐3‐hydroxybutyrate‐co‐(R)‐3‐hydroxyvalerate]/ multiwalled carbon nanotubes fibers

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