Page 194 - 《精细化工》2023年第3期

第 40 卷第 3 期 精 细 化 工 Vol.40, No.3
20 23 年 3 月 FINE CHEMICALS Mar. 2023

淀粉化学品
玉米淀粉/生物基碳点复合光转换薄膜的制备及性能

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徐振光，鲁诗言，李晓婷，于淑娟 ，刘乐平
（南宁师范大学 化学与材料学院，广西天然高分子化学与物理重点实验室，广西 南宁 530001）

摘要：以壳聚糖（CS）、N-(2-羟乙基)-乙二胺和无水柠檬酸（CA）为主要原料，通过水热法合成了壳聚糖接枝
柠檬酸碳点〔P(CS-g-CA)CDs〕。然后以玉米淀粉（CST）为基体材料，通过流延法制备了一系列不同
P(CS-g-CA)CDs 用量的玉米淀粉/壳聚糖基碳点复合光转换薄膜〔CST/P(CS-g-CA)CDs5、CST/P(CS-g-CA)CDs10、
CST/P(CS-g-CA)CDs20〕。采用荧光分光光度计、万能试验机、接触角测量仪和土埋降解实验研究了复合薄膜的
光学性能、力学性能、亲水性能和降解性能。结果表明，随着 P(CS-g-CA)CDs 用量的增加，该复合薄膜的拉伸
强度先升高后降低，断裂伸长率整体呈现增加趋势；复合薄膜的接触角从 37.50°提高到 87.00°，复合薄膜亲水
性能下降；纯玉米淀粉薄膜无荧光响应，CST/P(CS-g-CA)CDs20 能将 374 nm 处紫外光区的光转换为 459 nm 的
蓝色荧光，该复合薄膜具有蓝光转光性能；混入难水溶的碳点可以延缓纯玉米淀粉薄膜的降解，延长薄膜使用
寿命，实现降解速率可调控。
关键词：玉米淀粉；碳点；光转换薄膜；生物质材料；转光性能；淀粉化学品
中图分类号：O613.71；S626.4；TB383.2 文献标识码：A 文章编号：1003-5214 (2023) 03-0650-06

Preparation and properties of corn starch/bio-based carbon dots
composite films for light conversion

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XU Zhenguang, LU Shiyan, LI Xiaoting, YU Shujuan , LIU Leping
（Guangxi Key Laboratory of Natural Polymer Chemistry and Physics, College of Chemistry and Materials, Nanning
Normal University, Nanning 530001, Guangxi, China）

Abstract: Chitosan-grafted citric acid carbon dots [P(CS-g-CA)CDs] were firstly synthesized via hydrothermal
reaction of chitosan (CS), N-(2-hydroxyethyl)-ethylenediamine and anhydrous citric acid (CA). Then, a
series of corn starch/chitosan-based carbon dots composite light-converting films [CST/P(CS-g-CA)CDs5,
CST/P(CS-g-CA)CDs10, CST/P(CS-g-CA)CDs20] with different P(CS-g-CA)CDs dosages were prepared
by flow-delaying method. The optical, mechanical, hydrophilic and degradation properties of the composite
films synthesized were analyzed by fluorospectro photometer, universal testing machine, contact angle
instrument and soil degradation test. The results showed that, as the dosage of P(CS-g-CA)CDs, in the
composite films increased, the tensile strength of the composite films increased first and then decreased
while the elongation at break displayed an increasing trend as a whole. The contact angle of the composite
films increased from 37.50° to 87.00°, indicating reduced hydrophilicity. While film of pure corn starch
showed no fluorescence response, CST/P(CS-g-CA)CDs20 composite film exhibited blue light conversion
capacity by converting light in the UV region at 374 nm to blue fluorescence at 459 nm. Moreover, the
combination of water insoluble carbon dots could delay the degradation of corn starch, prolong the film
service life, and achieve adjustable degradation rate.
Key words: corn starch; carbon dots; light-converting film; biomass materials; light transfer performance;
starch chemicals

收稿日期：2022-06-17; 定用日期：2022-09-17; DOI: 10.13550/j.jxhg.20220563
基金项目：广西自然科学基金（2016GXNSFAA380203）
作者简介：徐振光（1999—），男，硕士生，E-mail: xzg53000@163.com。联系人：于淑娟（1977—），女，博士，教授，E-mail:
ysj2007@126.com；刘乐平（1980—），男，博士，教授，E-mail: 130078@nnnu.edu.cn。