甘油聚合度对纤维素纳米晶体复合虹彩薄膜结构和湿度响应性能的影响  

Effect of glycerol polymerization degree on the structure and humidity response of cellulose nanocrystals composite iridescent films

作　　者：安邦 孙文野 李光盈 陈芋 马春慧 罗沙 徐明聪 李伟[1] 刘守新[1] AN Bang;SUN Wenye;LI Guangying;CHEN Yu;MA Chunhui;LUO Sha;XU Mingcong;LI Wei;LIU Shouxin(Key Laboratory of Bio-based Material Science and Technology of the Ministry of Education,Northeast Forestry University,Harbin 150040,China)

机构地区：[1]东北林业大学生物质材料科学与技术教育部重点实验室,哈尔滨150040

出　　处：《复合材料学报》2024年第12期6737-6746,共10页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金项目(32071719);大学生创新训练计划项目(202210225089)。

摘　　要：为了探究添加物聚合度对纤维素纳米晶体(CNC)复合虹彩膜的影响,利用不同聚合度的甘油与CNC通过蒸发诱导自组装的方法制备了CNC/(聚)甘油复合虹彩薄膜。系统地研究了甘油聚合度对CNC复合虹彩膜结构色、力学性能和湿度响应能力的影响。结果表明:随甘油聚合度的增加,复合膜中CNC手性向列相结构的螺距变小,复合虹彩膜的颜色蓝移,最大反射波长降低了最多约40 nm。甘油的加入显著提高了复合虹彩膜的湿度响应能力,甘油聚合度越低,复合虹彩膜湿度响应能力越强,在高湿度下反射波长越大。其中甘油添加量为20wt%的虹彩膜在相对湿度为98%的环境中发生了170 nm的红移,膜颜色由青色变为红色;相较于纯CNC膜,(聚)甘油复合虹彩膜的力学性能显著提升。对于复合虹彩膜,随(聚)甘油分子链增长,虹彩膜的断裂伸长率和抗拉强度最大分别提升了1.58倍和2.48倍。In order to investigate the effect of glycerol with different polymerization degrees on mechanical and humidity response of cellulose nanocrystalls(CNC),CNC were mixed with glycerol,triglycerol,hexamylglycerol and decaglycerol at different mass ratios to prepared a series of CNC/polyglycerol composite iridescent films by evaporation-induced self-assembly.The effect of glycerol polymerization degrees on structural color,mechanical and humidity response property of CNC composite iridescence film was systematically studied.The iridescent color of the composite iridescent film is blueshifted with the increase of the degree of polymerization due to the decrease of pitch of CNC chiral nematic sturcture,the maximum reflective wavelength decreases by up to 40 nm.The addition of glycerol(and polyglycerol)significantly improved the humidity response ability of CNC films.For the composite film with the same amount of addition,the lower the degree of polymerization of polyglycerol,the stronger the humidity response ability and the redder in high humidity enviroment.The color of 20wt%sample with glycerol change from cyan to red in relative humidity 98%,redshift about 170 nm.Compared with pure CNC film,the mechanical properties of the composite films were significantly improved.And compared with glycerol,the elongation at break and the tensile strength of decaglycerol composite films increased by 1.58 times and 2.48 times,respectively.

关 键 词：纤维素纳米晶体 甘油 聚合 手性向列相结构 结构色 

分 类 号：TB332[一般工业技术—材料科学与工程]