Preparation and Performance of Composite Hydrogel Crosslinked by Surface Grafting Method of Thermo-sensitive Microsphere†

doi:10.7503/cjcu20150912

Abstract

Abstract:

To improve slow response rate and poor toughness of microsphere composite hydrogel(MCH), the MCH gels were prepared by grafting polyacrylamide chains onto the surface of thermo-sensitive polymer microspheres in the absence of crosslinking agent. Herein, polymer microspheres without chemical cross-linking structure were obtained by assembly of amphiphilic thermo-sensitive graft copolymer and employed as cross-linking junctions. MCH gels own excellent toughness(strain at break: 2800%, fracture energy: 80 kPa) and can adjust the mechanical properties according to temperature stimuli. Moreover, the results of investigation suggest that MCH gels exhibit thermo-sensitive property and their response rate are 5 to 10 times faster than the traditional poly(N-isopropyl acrylamide) organic gel.

Key words: Thermo-sensitive, Response rate, Polymer microsphere, Toughness, Hydrogel

CLC Number:

O633

TrendMD:

XU Tiantian, XU Kun, ZHOU Chao, TAN Ying, LU Cuige, WANG Pixin. Preparation and Performance of Composite Hydrogel Crosslinked by Surface Grafting Method of Thermo-sensitive Microsphere^†[J]. Chem. J. Chinese Universities, 2016, 37(5): 996.

Figures/Tables 13

Scheme 1 Synthetic mechanism of microspheres

Fig.1 TEM images of microspheres at 25 ℃(A) and 45 ℃(B)

Fig.2 Particle size distribution of microspheres at 25 ℃(a) and 45 ℃(b)

Fig.3 IR spectrum of microspheres

Fig.4 Deformation of MCH gels at 25 ℃

Fig.5 IR spectrum of MCH gels

Fig.6 Angular frequency dependence of storage modulus G'(solid symbol) and loss modulus G″(open symbol) at 20 ℃

Fig.7 Effective network chain density varying microspheres content at 20 ℃

Fig.8 Stress-strain curves of MCH gels with different contents of microspheres at 25 ℃Mass fraction of microsphere(%): a. 15; b. 20;c. 25; d. 30; e. 35.

Fig.9 Temperature dependence of storage modulus G'(solid symbol) and loss modulus G″(open symbol) of MCH gels

Fig.10 Temperature dependence of storage modulus ΔG' of MCH gels

Fig.11 Stress-strain curves of MCH gels(30%) at 25 ℃(a) and 45 ℃(b)

Fig.12 Shrinking dynamic curves of hydrogels(A) Deionized water; (B) V(acetone)∶V(water)=1∶1.

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