Preparation and properties of poly(3-hydroxybutyrate-4-hydroxybutyrate)/poly(lactic acid)fibers
Poly(3-hydroxybutyrate-4-hydroxybutyrate)(P34HB)stands as a promising biodegradable material,encounters challenges in its direct melt spinning process due to slow crystallization and high processing viscosity.Poly(lactic acid)(PLLA),possessing a similar chemical structure to P34HB,shares comparable processing temperatures and has a synergistic reinforcing effect with P34HB.A P34HB/PLLA fiber with a P34HB content of 30 wt%was fabricated by melt spinning method,subsequently the fiber's mechanical,thermal,and crystallization properties were examined.Results indicate that the maximum tenacity of fully drawn fibers(FDY-1 and FDY-2),obtained from the preparation of P34HB/PLLA pre-drawn fiber(POY)at a winding speed of 2 000 m/min and drawing and setting at 1.40 times and 1.75 times,respectively,are 1.66 cN/dtex and 2.29 cN/dtex respectively,and the elongations at break are 33.3%and 28.8%respectively.The differential scanning calorimetry(DSC)test reveal that the crystallinity of POY,FDY-1,and FDY-2 are 62.51%,62.05%,and 61.36%respectively.Additionally,XRD diffractometer analysis indicates that the crystallinity of POY is similar to that of FDY,suggesting that during the POY formation process,fiber crystallization is nearly complete,and P34HB enhances the crystallization efficiency of PLLA.
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