School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640, China; School of Renewable Natural Resources, Louisiana State University AgCenter, Baton Rouge, LA, 70803, USA; College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, China.
School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640, China.
Carbohydr Polym. 2018 Jun 1;189:331-341. doi: 10.1016/j.carbpol.2018.02.039. Epub 2018 Feb 21.
Hydrophobic and thermally-stable cellulose nanocrystals (CNCs) were synthesized by polycarpolactone diol (PCL diol) grafting via click chemistry strategy. The synthesis was designed as a three-step procedure containing azide-modification of CNCs, alkyne-modification of PCL diol and sequent copper(I)-catalyzed azide-alkyne cycloaddition reaction. The structure of azide-modified CNCs and alkyne-modified PCL diol, the structure, hydrophobic ability and thermal stability of click products CNC-PCL were characterized. FTIR, XPS and H NMR results indicated a successful grafting of the N groups onto the CNCs, synthesis of PCL diol-CCH, and formation of the CNC-PCL material. CNC-PCL had enhanced dispersion in the non-polar solvent chloroform owing to the well-maintained microscale size and PCL-induced hydrophobic surface. The thermal stability of CNC-PCL was largely increased due to the grafting of thermally-stable PCL. This work demonstrates that click chemistry is an attractive modification strategy to graft CNCs with polyester chains for further potential application in polymer composites.
通过点击化学策略，用聚己内酯二醇（PCL 二醇）接枝合成了疏水性和热稳定的纤维素纳米晶体（CNCs）。该合成设计为三步程序，包括 CNCs 的叠氮改性、PCL 二醇的炔基改性和随后的铜（I）催化的叠氮-炔基环加成反应。对叠氮改性 CNCs 和炔基改性 PCL 二醇的结构、点击产物 CNC-PCL 的结构、疏水性能力和热稳定性进行了表征。FTIR、XPS 和 H NMR 结果表明，成功地将 N 基团接枝到 CNCs 上，合成了 PCL 二醇-CCH，并形成了 CNC-PCL 材料。由于微尺度尺寸的良好保持和 PCL 诱导的疏水性表面，CNC-PCL 在非极性溶剂氯仿中具有增强的分散性。由于接枝了热稳定的 PCL，CNC-PCL 的热稳定性大大提高。这项工作表明，点击化学是一种有吸引力的修饰策略，可以将 CNCs 与聚酯链接枝，以进一步在聚合物复合材料中得到潜在应用。
