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202  8 Systematic Development of Electrospun PLA/PCL Fiber Hybrid Mats


                     (a)                             (b)














                      (c)                            (d)
















                      (e)                             (f)















                    Figure 8.6 SEM micrographs of electrospun PLA/15% LMW PCL fibers with different blend
                    ratios: (a) 1/0, (b) 3/1, and (c) 1/1, using chloroform/methanol; and (d) 1/0, (e) 3/1, and (f)
                    1/1, using chloroform/acetone [60]. The scale bars in SEM micrographs represent 10 μm.

                    8.4
                    Crystalline Structures

                    The crystalline structures of fiber mats were investigated by using XRD anal-
                    ysis, depicted in Figure 8.7. As for HMW PCL blended with PLA at the PCL
                    concentrations of 9 and 15 wt%/v, the XRD patterns demonstrate specific diffrac-
                                                 ∘
                                                         ∘
                    tion peaks of PLA/PCL at 2   = 20.11 and 23.2 , which correspond to the crystal
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