2‑Hydroxyethylcellulose and Amphiphilic Block
Polymer Conjugates Form Mechanically Tunable and Nonswellable Hydrogels
Posted on 2017-01-30 - 17:19
Herein, we report a family of mechanically
tunable, nonswellable
hydrogels that are based on a 2-hydroxyethylcellulose (HEC) scaffold
grafted with amphiphilic diblock copolymers. Poly[(oligo(ethylene
glycol)methyl ether methacrylate]-b-poly(methyl methacrylate)
(POEGMA-b-PMMA) diblock copolymers of different compositions
were created via RAFT polymerization using an alkyne terminated macro
chain transfer agent (CTA). 2-Hydroxyethylcellulose (HEC) was modified
with azide groups and the diblock copolymers were attached to the
backbone via the copper-catalyzed click reaction to yield HEC-g-(POEGMA-b-PMMA) graft terpolymers. The
resulting conjugates were soluble in DMF and able to form hydrogels
upon simple solvent exchange in water. By increasing the concentration
of the conjugates in DMF, the storage moduli of the hydrogels increased
and the pore size in the gel decreased. After hydrogel formation,
the structures were also found to be nonswellable (no macroscopic
volume change upon incubation in water), which is an important feature
for retaining size and mechanical integrity of the gels over time.
Moreover, these materials were able to be electrospun into fibers
that, upon hydration, formed fibrous hydrogel structures. The nonswellable
and tunable mechanical properties of these materials imply great potential
for a variety of applications such as personal care, active delivery,
and tissue engineering.
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Zheng, Jukuan; Jung, Seyoung; Schmidt, Peter W.; Lodge, Timothy P.; Reineke, Theresa M. (2017). 2‑Hydroxyethylcellulose and Amphiphilic Block
Polymer Conjugates Form Mechanically Tunable and Nonswellable Hydrogels. ACS Publications. Collection. https://doi.org/10.1021/acsmacrolett.6b00954
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AUTHORS (5)
JZ
Jukuan Zheng
SJ
Seyoung Jung
PS
Peter W. Schmidt
TL
Timothy P. Lodge
TR
Theresa M. Reineke
KEYWORDS
Nonswellable Hydrogels Herein2-materialmacro chain transfer agentPMMAnonswellablemethacrylatePOEGMAdiblock copolymersHydroxyethylcelluloseCTADMFamphiphilic diblock copolymersHECtunablemacroscopic volume changeconjugatehydrogelAmphiphilic Block Polymer Conjugates Form Mechanically Tunablecopper-catalyzed click reaction