Guo Li, Ji Cheng, Wang Haiwang, Ma Tianxiao, Qi Jian
Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province, Northeastern University at Qinhuangdao, Qinhuangdao 066004, PR China.
Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province, Northeastern University at Qinhuangdao, Qinhuangdao 066004, PR China.
J Colloid Interface Sci. 2024 Oct 15;672:497-511. doi: 10.1016/j.jcis.2024.06.046. Epub 2024 Jun 6.
The design and construction of high strength hydrogels is a widely discussed topic in hydrogel research. In this study, we combined three toughening strategies, including dual network, oriented structure construction and nanophase doping, to develop an alginate/polyacrylamide (PAM)/modified titanium dioxide fiber (TiO NF@PAM) dual network composite hydrogel prepared via syringe. The effects of different preparation methods, AM/Alginate ratios, inorganic doping phases and TiO NF@PAM/AM ratios on the mechanical properties of composite hydrogels were investigated. The study found that the alginate hydrogel prepared by syringe exhibited superior axial orientation and achieved a tensile strength of (1091 ± 46) kPa. And the composite hydrogel doped with 0.2 wt% TiO NF@PAM had a tensile strength of (1006 ± 64) kPa, which was higher than that of the composite hydrogel doped with 0.2 wt% TiO nanoparticles (976 ± 66) kPa. The highest tensile strength (1120 ± 67) kPa and elongation at break (182 ± 8) % were achieved when the ratio of TiO NF@PAM/AM was 0.6 wt%. The force applied to the gel solution in the syringe affects the orientation of the polymer chains and TiO NF@PAM within the gel, which subsequently impacts the mechanical properties of the hydrogel. Therefore, we further investigated the mechanical properties of composite hydrogels under varying propulsion speeds, syringe diameters, and syringe lengths. It was observed that the gel solution's shear strength increased as the syringe diameter decreased. The resulting composite hydrogels were better oriented and had improved mechanical properties. The composite hydrogels' tensile strength peaked at (1117 ± 47) kPa when the syringe advance rate was between 1-7 mL/min. The mechanical properties of the hydrogels were optimal when the syringe length was 30 mm, with a maximum tensile strength of (1131 ± 67) kPa and a tensile ratio of (166 ± 5) %. This study demonstrates the viability of integrating three distinct strengthening methodologies to generate hydrogels of considerable strength. Furthermore, the Alginate/PAM/TiO NF@PAM composite hydrogels possess remarkable potential as adaptable, wearable sensors due to their exemplary mechanical properties, knittability, and conductivity.
高强度水凝胶的设计与构建是水凝胶研究中一个广泛讨论的话题。在本研究中，我们结合了三种增韧策略，包括双网络、取向结构构建和纳米相掺杂，以开发一种通过注射器制备的藻酸盐/聚丙烯酰胺（PAM）/改性二氧化钛纤维（TiO NF@PAM）双网络复合水凝胶。研究了不同制备方法、AM/藻酸盐比例、无机掺杂相和TiO NF@PAM/AM比例对复合水凝胶力学性能的影响。研究发现，通过注射器制备的藻酸盐水凝胶表现出优异的轴向取向，拉伸强度达到（1091±46）kPa。掺杂0.2 wt% TiO NF@PAM的复合水凝胶的拉伸强度为（1006±64）kPa，高于掺杂0.2 wt% TiO纳米颗粒的复合水凝胶（976±66）kPa。当TiO NF@PAM/AM比例为0.6 wt%时，拉伸强度最高达到（1120±67）kPa，断裂伸长率为（182±8）%。施加在注射器中凝胶溶液上的力会影响凝胶内聚合物链和TiO NF@PAM的取向，进而影响水凝胶的力学性能。因此，我们进一步研究了在不同推进速度、注射器直径和注射器长度下复合水凝胶的力学性能。观察到凝胶溶液的剪切强度随着注射器直径的减小而增加。所得复合水凝胶具有更好的取向，力学性能得到改善。当注射器推进速率在1-7 mL/min之间时，复合水凝胶的拉伸强度峰值为（1117±47）kPa。当注射器长度为30 mm时，水凝胶的力学性能最佳，最大拉伸强度为（1131±67）kPa，拉伸比为（166±5）%。本研究证明了整合三种不同强化方法以制备具有相当强度的水凝胶的可行性。此外，藻酸盐/PAM/TiO NF@PAM复合水凝胶因其优异的力学性能、可编织性和导电性，作为适应性强的可穿戴传感器具有巨大潜力。
