摘要
半乳甘露聚糖主要来源于瓜尔豆等特色林产资源,因其潜在的应用前景而受到广泛关注。为了提高半乳甘露聚糖的温敏性能,拓展其应用范围,采用N-异丙基丙烯酰胺、聚乙二醇二丙烯酸酯、过硫酸铵、四甲基乙二胺、蒙脱土等为原料,合成了具有温度响应性的半乳甘露聚糖-聚(N-异丙基丙烯酰胺)复合水凝胶,并通过傅里叶红外光谱仪、X射线衍射、差示扫描量热法、热失重分析、万能试验机等对水凝胶的结构与性能进行表征。结果表明:制备的温敏水凝胶,具有快速弯曲的温度响应性;随着交联剂聚乙二醇二丙烯酸酯从N-异丙基丙烯酰胺单体用量的0%增加至2%,水凝胶的平衡溶胀率降低,且聚乙二醇二丙烯酸酯的引入增强了水凝胶的热稳定性,但其对水凝胶的结晶结构没有显著影响;随着半乳甘露聚糖的质量分数从0%增加至1%,水凝胶的压缩强度增加,最高为51 kPa。且用质量分数1%的四硼酸钠溶液处理后,样品压缩强度增强一倍以上,半乳甘露聚糖质量分数为1%的样品增强至107 kPa。半乳甘露聚糖-聚(N-异丙基丙烯酰胺)复合水凝胶,绿色无污染,环保可降解,力学强度高,对温度响应速度快,实现了对植物资源高值化利用的同时也探索了其在温敏智能材料的应用潜力。
Galactomannan is mainly sourced from forest resources such as guar beans.Galactomannan hydrogel has attracted more and more attention because of its unique flexibility and versatile functions.Temperature responsive hydrogels can undergo reversible volume phase change or other changes in physicochemical properties with slight changes in environmental temperature.They have promising application prospects in tissue engineering and drug release.Poly(N-isopropylacrylamide)has a volume phase transition at about 33℃.When the external temperature is lower than 33℃,the molecular chain of poly(N-isopropylacrylamide)stretches.While the external temperature reaches 33℃or higher,the molecular chain of poly(N-isopropylacrylamide)will contract suddenly and undergo a phase change.In order to improve the temperature-sensitive properties of galactomannan and expand its application scope,this study introduced N-isopropylacrylamide into the galactomannan hydrogel.Galactomannan and N-isopropylacrylamide were used as main raw materials.Poly(ethylene glycol)diacrylate was used as a cross-linking agent.Ammonium persulfate was used as the initiator and montmorillonite was used as the reinforcing agent.The temperature-responsive galactomannan-poly(N-isopropylacrylamide)composite hydrogel was prepared by a simple solution polymerization.The structure and properties of the hydrogels were also characterized by the Fourier transform infrared spectroscopy,X-ray diffraction,Differential scanning calorimetry,Thermogravimetric analysis,and Universal testing machines.The results showed that the galactomannan hydrogel prepared had a fast temperature response.As the cross-linking agent poly(ethylene glycol)diacrylate increased from 0%to 2%of the molar amount of the N-isopropylacrylamide monomer,the equilibrium swelling rate of the hydrogels decreased,and the introduction of poly(ethylene glycol)diacrylate enhanced the thermal stability of hydrogels,but it did not have a significant effect on the crystalline structure of the hydrogels.As the content of galactomannan increased from 0%to 1%(wt),the compressive strength of hydrogels increased.The compressive strength of hydrogel with 1%content was the largest,being 51 kPa.When the hydrogel was treated with 1%(wt)sodium tetraborate solution,the compressive strength of the hydrogel increased more than twice,and the compressive strength of the hydrogel with 1%(wt)content of galactomannan was 107 kPa.Galactomannan poly(N-isopropylacrylamide)composite hydrogel has the characteristics of green,pollution-free,environmentally degradable,high mechanical strength and fast response to temperature.The preparation of this hydrogel has achieved high quality utilization of plant resources and explored the potential application of galactomannan for thermosensitive smart materials.
作者
李琳
赵倩
闻汉康
蒋建新
刘六军
段久芳
LI Lin;ZHAO Qian;WEN Hankang;JIANG Jianxin;LIU Liujun;DUAN Jiufang(College of Materials Science and Technology,Engineering Research Center of ForestryBiomass Materials and Energy,Beijing Forestry University,Beijing 100083,China)
出处
《林业工程学报》
CSCD
北大核心
2021年第5期120-127,共8页
Journal of Forestry Engineering
基金
国家级大学生创新创业训练计划(G201910022049)
国家自然科学基金(3160030214)
国家林业和草原局委托项目(KJZXYZ2018002)。
关键词
半乳甘露聚糖
水凝胶
温敏材料
弯曲变形
N-异丙基丙烯酰胺
galactomannan
hydrogel
temperature-sensitive material
bending deformation
N-isopropylacrylamide
作者简介
李琳,女,研究方向为林产化工。;通信作者:段久芳,女,副教授。E-mail:duanjiu99@163.com。
