物理化学学报 >> 2016, Vol. 32 >> Issue (8): 2039-2044.doi: 10.3866/PKU.WHXB201605122

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多重网络增强的层状光子晶体水凝胶及应力变色响应

向双飞,李婷,汪洋,东为富*()   

  • 收稿日期:2016-03-21 发布日期:2016-07-29
  • 通讯作者: 东为富 E-mail:wfdong@jiangnan.edu.cn
  • 基金资助:
    国家自然科学基金(51373070)

A Lamellar Photonic Hydrogel Reinforced by Triple Network with Fast and Reversible Mechanochromic Properties

Shuang-Fei XIANG,Ting LI,Yang WANG,Wei-Fu DONG*()   

  • Received:2016-03-21 Published:2016-07-29
  • Contact: Wei-Fu DONG E-mail:wfdong@jiangnan.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(51373070)

摘要:

基于PDGI/PAAm (PDGI/SN)层状光子晶体水凝胶,制备了多重网络PDGI/PAAm-PAMPS-PAAm(PDGI/TN)水凝胶,将水凝胶浸入6 : 4(V/V)乙醇水溶液中去溶胀,记为凝胶PDGI/TN-0.6。结果表明,引入多重网络之后,PDGI/TN凝胶的溶胀率从PDGI/SN的850% ± 45%提高到1070% ± 50%,颜色从蓝色(λmax=450 nm)变为透明,去溶胀后Bragg衍射峰为670 nm,实现凝胶的Bragg衍射峰在450-670 nm间调控。拉伸和压缩实验说明,PDGI/TN-0.6力学性能优异,拉伸强度和压缩强度分别达到0.99和37.0 MPa。同时,PDGI/TN-0.6具有优异应力变色响应性,压缩应变(εc)从0增加到0.5,Bragg衍射峰发生蓝移,响应范围覆盖可见光;当撤去应力后,立即恢复初始状态,可重复多次。利用扫描电镜(SEM)进一步研究了层状光子晶体水凝胶层微观结构。

关键词: 层状结构, 光子晶体, 水凝胶, 机械变色

Abstract:

The multi-network material PDGI/PAAm-PAMPS-PAAm (PDGI/TN) was synthesized, starting from PDGI/PAAm (PDGI/SN). The PDGI/TN was subsequently deswelled to an equilibrium state in an ethanol/water mixture (6 : 4)(V/V) to generate a material termed PDGI/TN-0.6. The results indicate that the swelling radio of the PDGI/TN was increased to 1070% ± 50%, compared with a value of 850% ± 45% for the original PDGI/SN. In addition, the color of the gel changed from blue (λmax=450 nm) to transparent and the Bragg diffraction peak transitioned to 670 nm. The Bragg diffraction peak could also be tuned over the range from 450 to 670 nm by adjusting triple network and the ethanol/water solution. Loading-unloading cycling in conjunction with tensile and compressive testing demonstrated that the PDGI/TN-0.6 possessed outstanding mechanical properties. The tensile and compressive stresses of PDGI/TN-0.6 were significantly improved from those of the initial PDGI/ SN, to 0.99 and 37.0 MPa, respectively. Loading-unloading cycling data showed that the PDGI/TN-0.6 exhibited excellent responsiveness even after repeated trials. As compressive strain (εc) was increased from 0 to 0.5, the Bragg diffraction peak underwent a blue shift under compression and eventually spanned the entire visible spectrum wavelength range at the same rate that compressive deformation was applied and released. The effect of the triple network on the inner layer distance in this material was also investigated using scanning electron microscopy (SEM).

Key words: Lamellar structure, Photonic hydrogel, Hydrogel, Mechanochromic

MSC2000: 

  • O648