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. Author manuscript; available in PMC: 2019 Apr 9.
Published in final edited form as: ACS Biomater Sci Eng. 2017 Apr 6;4(4):1251–1264. doi: 10.1021/acsbiomaterials.6b00804

Figure 1.

Figure 1

Characterization of the PPS polymer and microspheres. (A) Synthesis of poly(propylene sulfide) by anionic polymerization. (B) 1H NMR spectrum for PPS polymer. (C) Average molecular weight (Mn = 6700 g/mol) and polydispersity (PDI = 1.1) of the PPS were assessed by GPC. (D) The size distribution of the PPS-MS was measured with SEM, and the mean diameter and diameter range were 1.09 ± 0.46 μm and 0.30–5.27 μm, respectively.