非冻结水对微球复合水凝胶机械性能的影响

doi:10.11944/j.issn.1000-0518.2018.11.180013

摘要/Abstract

摘要：

本文旨在用DSC的方法研究水凝胶结合水的能力与韧性的关系。分别以甲基丙烯酸丁酯(BMA)或甲基丙烯酸六氟丁酯(HFBMA)和烯丙基胺为单体,制备了2种核壳纳米微球(BMA微球和HFBMA微球)。再以其作为大分子引发剂和交联剂,制备了微球交联复合水凝胶(BMA-H凝胶和HFBMA-H凝胶)。通过差示扫描量热仪(DSC)、傅里叶变换红外光谱仪(FTIR)和透射电子显微镜(TEM)等技术手段研究凝胶的结构和性能。结果表明,HFBMA-H凝胶具有更好的机械性能,其拉伸强度和断裂伸长率分别可达280 kPa和3960%,远高于BMA-H凝胶(101 kPa,2700%)。通过对2种复合凝胶体系内不同状态的水进行分析,发现HFBMA-H凝胶的非冻结水的质量分数明显高于BMA-H凝胶,这种非冻结水的增塑作用对于凝胶机械强度的提升具有重要影响。

关键词: 核壳微球, 复合水凝胶, 差示扫描量热法, 非冻结水

Abstract:

The aim of this paper is to study the relationship between the ability to combine water and the toughness of hydrogel by means of differential scanning calorimetry(DSC). N-butyl methacrylate(BMA) or 2,2,3,4,4,4-hexafluorobutyl methacrylate(HFBMA) and allylamine were chosen as monomers to synthesize core-shell nanospheres(named BMA nanosphere or HFBMA nanosphere). Then, the two nanospheres were used as macromolecular initiators and crosslinking agents to prepare nanospherical composite hydrogels(named BMA-H hydrogel or HFBMA-H hydrogel). DSC, Fourier transform infrared spectrometer(FTIR) and transmission electron microscopy(TEM) were used to characterize the structures and properties of hydrogels. The results of mechanical performance analysis indicate that the HFBMA-H hydrogel has better mechanical properties and its tensile strength and fracture elongation are up to 280 kPa and 3960%, respectively, which are much higher than those of BMA-H hydrogel(101 kPa, 2700%). DSC was used to investigate the state and proportion of water in composite hydrogels with different kinds of nanospheres. The results show that the non-freezing water content of HFBMA-H hydrogel is far higher than that of BMA-H hydrogel under the same water content, and the plasticizing effect of non-freezing water has an important effect on the mechanical strength of the hydrogel.

Key words: core-shell microgel, composite hydrogel, differential scanning calorimetry, non-freezing water

梁学称,邓裕坤,裴小朋,翟侃侃,徐昆,谭颖,王丕新. 非冻结水对微球复合水凝胶机械性能的影响[J]. 应用化学, 2018, 35(11): 1301-1308.

LIANG Xuechen,DENG Yukun,PEI Xiaopeng,ZHAI Kankan,XU Kun,TAN Ying,WANG Pixin. Effect of Non-freezing Water on the Mechanical Properties of Microspherical Composite Hydrogels[J]. Chinese Journal of Applied Chemistry, 2018, 35(11): 1301-1308.

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