College of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang 414000, China; College of Biomass Science and Engineering, Sichuan University, Chengdu 610065, China.
College of Biomass Science and Engineering, Sichuan University, Chengdu 610065, China.
Int J Biol Macromol. 2022 Feb 15;198:187-193. doi: 10.1016/j.ijbiomac.2021.12.136. Epub 2021 Dec 30.
The dispersion of cellulose nanocrystal (CNC) in starch matrix limited its application. In this study, CNC modified by silanecouplingagent before graphene oxide (GO) self-assembled on the surface of modified CNC, then CNC-GO as a filler was used to prepare starch-based nanocomposite films (CS/CNC-GO). The structure of CNC-GO and CS/CNC-GO films and the properties of CS/CNC-GO films were studied by FT-IR, Raman, SEM, surface potential, UV-Vis, moisture absorption and tensile tests. The results showed that GO was successfully self-assembled on the surface of CNC modified by silanecouplingagent. CNC-GO was superior to CNC in reinforcing the strength of starch film, improving the transmittance of starch film and decreasing moisture rate of starch film. Tensile strength, elongation at break and transmittance of CS/CNC-GO film with 5 wt% CNC-GO reached maximum, which was 53.96 MPa, 3.72% and 38.76%, respectively. Moisture rate of CS/CNC-GO film with 3 wt% CNC-GO reached minimum that was 12.13%. These were assigned to the more uniform dispersion of CNC-GO in the starch matrix and the stronger interfacial interaction between starch and CNC-GO.
纤维素纳米晶体（CNC）在淀粉基体中的分散性限制了其应用。本研究中，先对 CNC 进行硅烷偶联剂改性，然后使氧化石墨烯（GO）自组装在改性 CNC 的表面，再将 CNC-GO 作为填充剂用于制备基于淀粉的纳米复合材料薄膜（CS/CNC-GO）。通过傅里叶变换红外光谱（FT-IR）、拉曼光谱、扫描电子显微镜（SEM）、表面电位、紫外-可见分光光度计（UV-Vis）、吸湿性和拉伸试验研究了 CNC-GO 和 CS/CNC-GO 薄膜的结构以及 CS/CNC-GO 薄膜的性能。结果表明，GO 成功地自组装在经过硅烷偶联剂改性的 CNC 表面上。与 CNC 相比，CNC-GO 更能增强淀粉膜的强度、提高淀粉膜的透光率和降低淀粉膜的吸湿性。当添加 5wt% CNC-GO 时，CS/CNC-GO 薄膜的拉伸强度、断裂伸长率和透光率达到最大值，分别为 53.96MPa、3.72%和 38.76%。当添加 3wt% CNC-GO 时，CS/CNC-GO 薄膜的吸湿性达到最小值，为 12.13%。这归因于 CNC-GO 在淀粉基体中的分散更均匀以及淀粉和 CNC-GO 之间的界面相互作用更强。
