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Direct imaging of nanoscopic plastic deformation below bulk Tg and chain stretching in temperature-responsive block copolymer hydrogels by Cryo-TEM

Nykänen, Antti ; Nuopponen, Markus ; Hiekkataipale, Panu ; Hirvonen, Sami-Pekka ; Soininen, Antti ; Tenhu, Heikki ; Ikkala, Olli ; Mezzenga, Raffaele

In: Macromolecules, 2008, vol. 41, no. 9, p. 3243–3249

This work describes the thermoresponsive transition in polystyrene-block-poly(N-isopropylacrylamide)-block-polystyrene (PS-block-PNIPAM-block-PS) triblock copolymer hydrogels, as observed by both direct and reciprocal space in-situ characterization. The hydrogel morphology was studied in both the dry and wet state, at temperatures below and beyond the coil−globule transition of PNIPAM, using...