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3.3. SEM micrographs of PLGA/PHBV scaffold The morphology of the pure PLGA scaffold and PLGA/PHBV scaffolds containing different amount of PHBV microspheres were shown in Fig. 3. The SEM graphs (A, B, C and D) showed the bonding between PHBV microspheres and PLGA matrix. The PHBV microspheres were distributed all across the PLGA matrix and most of them were buried in the PLGA matrix which might make them hard to separate from the matrix. Graphs A, C and E demonstrated that all of the three kinds of scaffold possessed interconnected porous structure. It can be observed from graphs A and C that the addition of PHBV microspheres made the morphology of the PLGA/PHBV scaffold much rougher than that of pure PLGA scaffold. However, with the increase of PHBV microspheres, the pore size of PLGA/PHBV scaffolds changed little. The PLGA matrix walls were decorated with PHBV microspheres which can be seen from graphs B and D and they were seldom influenced by PHBV microspheres, which can be convinced by the well-connected walls. |
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