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. Author manuscript; available in PMC: 2018 Aug 10.
Published in final edited form as: J Mater Chem B. 2017 May 11;5(22):4198–4206. doi: 10.1039/c7tb00657h

Figure 4.

Figure 4

Effects of surface grafting on dispersion in nHA/PEUR composites. (A) Mixing and injection of nHA-LTI/LTI prepolymer with PCL triol in a double-barrel syringe fitted with a static mixture. (B) Schematic illustrating the reaction between NCO groups in LTI and nHA-LTI with hydroxyl groups in poly(caprolactone) (PCL) triol to form crosslinked nanocomposites. (C) SEM images of aggregated particles (>1 μm, yellow lines) in nHA (left) and nHA-LTI (right) nanocomposites. (D) Area% of aggregates in nHA nanocomposites was 5 times larger than that measured for nHA-LTI nanocomposites. (E) Swelling of nHA and nHA-LTI nanocomposites after incubating in dichloromethane for 24 h decreased significantly with surface grafting and increasing index from 115 (white) to 140 (hatched).