Poly(N-isopropylacrylamide) nanocrosslinked by polyhedral oligomeric silsesquioxane: Temperature-responsive behavior of hydrogels

Surface modification of cotton fabric with dual‐responsive PNIPAAm/chitosan nano hydrogel

“…Obviously, the size of nano particles in the dry state is less than when immersed in water; this feature is related to swelling ability of hydrogels in water. According to the papers published before, [39,40] the LCST of PNIPAAM was reported around [32][33][34] C. In the case of PNCS nano hydrogel, the DSC profile indicates that the LCST behavior of PNIPAAm is approximately unaffected by the formation of copolymer with the chitosan and was taken around 32 C. Figure 2a shows the effect of pH on the hydrodynamic size of PNCS nano particles at 20 C. The results indicate that PNCS nano particles are in the swollen state at a low pH. When pH increases, the size of PNCS nano particles gradually decreases.…”

“…[41] Figure 2b presents the effect of temperature on the hydrodynamic size of PNCS nano hydrogel studied by DLS methods at a pH of 6.5. The resulting plot shows that swollen nano hydrogel at 20 C have an average diameter of 87.71 nm, while the fully collapsed nano hydrogel at 40 C have an average size of 67.9 nm. These results confirm the swelling behavior of PNIPAAm molecules that are completely hydrated at temperatures below LCST (~32 C), and above this critical temperature, PNIPAAm is extensively dehydrated.…”

Evaluating a simple blending approach to prepare magnetic and stimuli-responsive composite hydrogel particles for application in biomedical field

“…Stimuli-responsive hydrogels known as smart materials are macromolecules that undergo reversible volume phase transition in response to a small change of external stimuli such as temperature [1][2][3][4][5][6][7][8][9], pH [9][10][11][12][13], light [14][15][16], electric current [17][18][19], ionic strength [20][21][22] or chemical species [23]. Researchers are showing much attention in these materials for their wide range of biomedical and pharmaceutical applications [24][25][26][27][28][29].…”

Temperature and pH dual-responsive behavior of polyhedral oligomeric silsesquioxane-based star-block copolymer with poly(acrylic acid-block-N-isopropylacrylamide) as arms

“…Recently, much attention has been given to the use of octafunctional polyhedral oligomeric silsesquioxane (POSS) to construct star-shaped hybrid polymers [20][21][22][23][24][25]. The attractiveness of POSS for synthesis of star polymers lies in that they are well-defined nanometer-sized cages with eight reaction sites and can be easily functionalized with groups that can initialize living polymerizations to achieve well-controlled arm length [26][27][28].…”

“…The attractiveness of POSS for synthesis of star polymers lies in that they are well-defined nanometer-sized cages with eight reaction sites and can be easily functionalized with groups that can initialize living polymerizations to achieve well-controlled arm length [26][27][28]. POSS has been used to prepare thermoresponsive PNIPAm networks [22] and tadpole-shaped POSSPNIPAm hybrids [29][30][31]. Recently, Yao et al reported POSSbased star-block copolymers containing poly(ε-caprolactone) and PNIPAm that form nano micelles in aqueous media and exhibit temperature-dependent drug release behavior [32].…”