

FOLLOWUS
Laboratory of Advanced Materials (MOE), Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
Xu-ming Xie (谢续明), E-mail: xxm-dce@mail.tsinghua.edu.cn
Received:11 April 2016,
Revised:2016-5-21,
Accepted:28 May 2016,
Published:25 February 2016
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Zhang Li-qin, Chen Li-wen, Zhong Ming, et al. Phase Transition Temperature Controllable Poly(acrylamide-
Poly(acrylamide
-co-
acrylic acid) nanocomposite physical (P(AAm
-co-
AAc)NCP) hydrogels have been prepared through the
in situ
free radical solution polymerization based on a “single network
dual cross-linkings” strategy. The P(AAm
-co-
AAc) NCP hydrogels are composed of nanobrushes of P(AAm
-co-
AAc) chains grafted on the surface of vinyl-hybrid silica nanoparticles (VSNPs). In the hydrogel system
the VSNPs act as the “analogous chemical cross-linking points” once the hydrogen bonds formed between the P(AAm
-co-
AAc) chains of the nanobrushes
thus leading to the fabrication of high-strength P(AAm
-co-
AAc) NCP hydrogels. Compared with conventional thermosensitive P(AAm
-co-
AAc) hydrogels
the P(AAm
-co-
AAc) NCP hydrogels have a broader range of phase transition temperature
which can be adjusted by altering the monomer ratio
the VSNPs concentration
the addition of urea and
N
N
-dimethylacrylamide (DMAAm). At the same time
the mechanical properties of the P(AAm
-co-
AAc) NCP hydrogels have been improved significantly by the introduction of VSNPs. Furthermore
both the phase transition and the tensile strength of the P(AAm
-co-
AAc) NCP hydrogels are largely influenced when Fe
3+
ions are introduced as the ionic crosslinkers into the hydrogel networks.
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