淀粉基吸水树脂后处理方式对其吸水性能的影响  

Effect of Post-Treatment Methods on the Water Absorbency of Starch-based Absorbent Polymers

作　　者：谭琼 贾欣宇 陈慧[1,2] TAN Qiong;Jia Xinyu;CHEN Hui(College of Biomass Science and Engineering,Sichuan University,Chengdu 610065,China;National Engineering Laboratory for Clean Technology of Leather Manufacture,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学轻工科学与工程学院,四川成都610065 [2]四川大学制革清洁技术国家工程实验室,四川成都610065

出　　处：《皮革科学与工程》2023年第3期19-23,56,共6页Leather Science and Engineering

基　　金：四川省应用基础研究项目(2022NSFSC0351)。

摘　　要：淀粉基吸水树脂因不同纯化和干燥后处理方式形成的不同微孔结构,是影响其吸水性能的关键。文章利用傅里叶变换红外光谱仪,X射线衍射仪,差示扫描量热分析仪和扫描电子显微镜对不同后处理方式的淀粉基吸水树脂的化学结构和性能进行表征。结果表明,后处理方式没有改变淀粉基吸水树脂的晶型结构和玻璃化转变温度;乙醇浸泡处理相比水提醇沉的淀粉基吸水树脂,外表层更加致密,孔洞更深;冷冻干燥相比热风干燥的淀粉基吸水树脂,微孔结构更加完整,孔径更小,孔分布更密集,孔隙率更高。乙醇浸泡-冷冻干燥后处理的淀粉基吸水树脂吸水倍率最高,浸泡吸水24 h,吸水倍率可达1320 g/g,因此乙醇浸泡-冷冻干燥是一种较好的后处理方式。Different microporous structures of starch-based absorbent polymers formed by using different post-processing methods such as purification and drying are the key factors affecting their water absorbency.The chemical structure and properties of the starch-based absorbent polymers post-treated with different methods were characterized by Fourier Transform Infrared Spectrometer,X-Ray Diffraction,Differential scanning calorimetry and Scanning Electron Microscopy techniques.The results showed that post-treatment methods did not change the crystal structures and glass transition temperatures of the starch-based absorbent polymers.Compared with the water extraction method,the ethanol soaking post-treatment could result in the starch-based absorbent polymer with the denser surface layer and the deeper pore structure;compared to the ones dried by hot air,the starch-based absorbent polymers obtained by the freeze drying method featured the more complete microporous structure,the smaller pore size,the denser pore distribution and the higher porosity.After ethanol soaking and freeze-drying treatment,the resulting starch-based absorbent polymers exhibited the highest water absorbency,and the water absorption rate could reach 1320 g/g soaking for 24 h.Thus,this treatment is an excellent post-treatment method.

关 键 词：淀粉基吸水树脂 后处理方式 吸水倍率 

分 类 号：TQ322[化学工程—合成树脂塑料工业]