Thermo-responsive hydrogel prepared by double network formation with well-defined architected star polymers.
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초록
내용
Temperature responsive volume phase transition near the human body temperature is an important property of poly(N-isopropylacrylamide) (PNIPAm) hydrogels to be used for wide applications. However, the weak mechanical properties of PNIPAm limits its practical application. In this work, we prepared a double network using a new type of interpenetrating polymer system in which alginate and PNIPAm polymers are networked. Well-defined thermally reactive 4-arms polymeric materials containing tetra(trithiocarbonate) (TTC4) terminated PNIPAm [(PNIPAm -TTC)4] was synthesized by using reversible deactivation radical polymerization (RDRP) and click chemistry. One advantage these systems provide is their ability to form a polymer network with a more homogeneous structure. Along with concurrent growth and uniform distribution of chains, all these factors ensure a well-defined network structure, which show high mechanical robustness.