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首页> 外文期刊>Journal of Applied Polymer Science >Effect of pore orientation on shear viscoelasticity of cellulose nanocrystal/collagen hydrogels
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Effect of pore orientation on shear viscoelasticity of cellulose nanocrystal/collagen hydrogels

机译：孔取向对纤维素纳米晶/胶原水凝胶剪切粘弹性的影响

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Motivated by a need to replicate structural and viscoelastic properties of soft tissue, such as cartilage, the structural hydrogels with viscoelastic feature have been of interest in biomedical application. However, the effect of pore alignment on their viscoelastic properties has been largely underestimated. This work prepared cellulose nanocrystal (CNC)/collagen hydrogels with different pore orientations, including horizontally aligned pores, random pores and vertically aligned pores, and integrated them into a multilayered hydrogel with multi-structure which mimics cartilage construct. The stress relaxation rate (tau(1/2)), creep rate (gamma(1/2)), storage modulus (G ') and loss modulus (G '') increased in the order of the vertical, random, multi-structural, and horizontal.G ' value of the horizontal increased up to 300% relative to the vertical in the strain amplitude and frequency sweep. Maxwell-Weichert and Variable Network Density models were used to explain phenomena, and the experimental curves fitted well with the theoretical models. These results reveal that the viscoelastic properties of hydrogel can be influenced by pore orientation except conventional component concentration.
机译：由于需要复制软组织（如软骨）的结构和粘弹性特性，具有粘弹性特性的结构水凝胶在生物医学应用中备受关注。然而，孔隙排列对其粘弹性性能的影响在很大程度上被低估。本工作制备了具有不同孔取向的纤维素纳米晶体（CNC）/胶原水凝胶，包括水平排列的孔、随机排列的孔和垂直排列的孔，并将它们整合成具有多结构的多层水凝胶，模拟软骨结构。应力松弛率（tau（1/2））、蠕变率（gamma（1/2））、储能模量（G'）和损耗模量（G'）按垂直、随机、多结构和水平的顺序增加。在应变振幅和频率扫描中，水平方向的G'值相对于垂直方向增加了300%。用Maxwell-Weichert模型和变网络密度模型解释了这一现象，实验曲线与理论模型吻合良好。这些结果表明，除了常规的组分浓度外，水凝胶的粘弹性性质还受孔取向的影响。

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