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. 2016 Jan 11;6:19077. doi: 10.1038/srep19077

Figure 3. The thermally reversible gelation study of the PDLLA-PEG-PDLLA (PLEL) hydrogel (S3, 25 wt%) comparing with the PCL-PEG-PCL (PCEC) hydrogel (20 wt%).

Figure 3

(A,B) Change in G’ of the PLEL copolymer solution and PCEC copolymer solution under heating and cooling process. (C) Polarized optical microscopic images of the PLEL copolymer solution and PCEC copolymer solution under different conditions: images of the polymer solutions at 20 °C; images of the polymer hydrogels formed by direct heating at 37 °C; images of the samples after 1 hour at 20 °C. The scale bar was 20 μm. (D) X-ray diffraction pattern of the PLEL hydrogel formed instantaneously at 37 °C and PCEC hydrogel formed at 20 °C for 1 hour or formed instantaneously at 37 oC.