Morphology and Mechanical Properties of Different Hydroxyvalerate Contents Blended Poly hydroxybutyrate-co-hydroxyvalerate as-spun Fiber Prepared by Dry Spinning

摘要

Natural source poly [hydroxybutyrate-cohydroxyvalerate] (PHBV) with a low hydroxyvalerate (HV) content (2 mol% ) was modified by blending it with PHBV with a high HV content in solution. The morphology and mechanical properties of the as-spun fiber by dry spinning was determined by scanning electron microscope (SEM), differential scanning calorimetry (DSC), tensile measurements and wide angle X-ray diffraction (WAXD). The results showed that there were a few of flute -like lines parallel to the fiber axis on the surface of the as-spun fiber. With the increasing weight fraction of the high HV content blended, the melting temperature of the PHBV as-spun fibers decreased, the degree of crystallinity increased the tensile strength and elongation tended to increase. After aging at room temperature for at least 24 h, the elongation at break of the as-spun fibers was still more than 300%. The WAXD study revealed the improved physical properties of the as-spun fibers with the high HV content blended characterized by high HV content supplying more amorphous region in molecular chains to interfere the secondcrystallization which made the materials stiff and brittle. The as-spun fibers provided a good basis for post-processing.