海藻酸钠水凝胶3D打印效果和流变特征及其相关性分析  

Correlation Analysis of 3D Printability and Rheological Properties of Sodium Alginate Hydrogels

作　　者：钟启明 张佳雨 郭城 杨国燕 贾喜午 刘玉彪 金伟平 ZHONG Qiming;ZHANG Jiayu;GUO Cheng;YANG Guoyan;JIA Xiwu;LIU Yubiao;JIN Weiping(College of Food Science and Technology,Wuhan Polytechnic University,Wuhan 430000,China;Wuhan COFCO Co.,Ltd.,Wuhan 431400,China)

机构地区：[1]武汉轻工大学食品科学与工程学院,湖北武汉430000 [2]武汉中粮科技食品有限公司,湖北武汉431400

出　　处：《食品工业科技》2023年第23期21-28,共8页Science and Technology of Food Industry

基　　金：国家自然科学基金(32072152)。

摘　　要：本研究以钙离子诱导海藻酸钠水凝胶为模型,通过稳态剪切、形变扫描、屈服应力等流变学测试,辅以水合分布特征分析海藻酸钠水凝胶网络结构,综合3D打印产品的形态与Micro-CT微结构,经Spearman相关性系数分析,建立流变参数与3D打印效果之间的关联性。结果表明,当固定海藻酸钠与Ca2+质量分数比为24:1,海藻酸钠浓度为4.5%时,凝胶3D打印产品形态评分最佳,层纹结构清晰,孔隙率为12.21%。此时凝胶的流变特征参数K、η_(1)、G’、G"、τ_(0)和τy分别为255.1Pa·sn,2740 Pa·s,3509Pa,673.2Pa,261.4Pa和51.62Pa;凝胶网络内部以毛细管水(约99.20%)为主,表现出强持水力。相关性分析结果表明,凝胶打印挤出流畅性与粘度特性(K,η_(1),和G")呈负相关,相关系数为-0.577,而产品的自支撑能力与弹性模量和应力特征值(G’、τ_(0)和τy)呈显著正相关(P<0.05)。In this study,Ca2+-induced sodium alginate hydrogel was used as a model.The rheological properties were measured via steady-state shear,oscillation strain sweep,and yield stress.The network of sodium alginate hydrogels was analyzed using water distribution and rheological parameters.After a comprehensive analysis of the morphology and Micro-CT structure of 3D printing products,the mathematical relationship between rheological parameters and 3D printing effect was established using the Spearman's correlation analysis.The results showed that the highest score of 3D printing product was prepared at the mass ratio of SA to Ca2+at 24:1 and the concentration of SA at 4.5%.At the same time,the filament structure of 3D printing product was fine and the porosity was 12.21%.Rheological parameters of K,η_(1),G',G",τ_(0) andτy were 255.1 Pa·sn,2740 Pa·s,3509 Pa,673.2 Pa,261.4 Pa,and 51.62 Pa,respectively.The capillary water(about 99.20%)was dominant in the gel network,showing strong water holding capacity of hydrogel.Results of correlation analysis showed that the viscosity properties(K,η_(1),and G")were negatively correlated with the extrudability,and the correlation coefficient was-0.577.The self-supporting capacity of the 3D printing product was positively correlated with the elastic modulus and stress(G',τ_(0),andτy)(P<0.05).

关 键 词：3D打印 海藻酸钠 水凝胶 流变学 相关性分析 

分 类 号：TS207.1[轻工技术与工程—食品科学]