FIG. 1.

(A) Chemical structure of PPS₁₃₅-b-PDMA₁₅₂-b-PNIPAAM₂₂₅, PDN hydrogel. (B) Vial inversion demonstrates thermal gelation of the hydrogel at 37°C. At 22°C, PDN hydrogel with (bottom images) or without (top images) collagen is a liquid. Both self-assemble into gels when heated. (C) The collagen network is homogeneously incorporated into the PDN and CDN polymer hydrogels, forming composite materials. Scale bar: 20 μm. (Ci) Collagen only. (Cii) 3 wt. % PDN hydrogel only. (Ciii) Collagen with 3 wt. % PDN hydrogel. (Civ) 3 wt. % CDN hydrogel. (Cv) 3 wt. % CDN hydrogel and collagen. PPS₁₃₅-b-PDMA₁₅₂-b-PNIPAAM₂₂₅, PDN, poly[(propylene sulfide)-block-(N,N-dimethyl acrylamide)-block-(N-isopropylacrylamide)].