静电纺丝制备纤维素纳米晶表面接枝聚乙二醇固-固相变纳米纤维

Electrospun Solid-solid Phase Change Nanofibers of Poly（Ethylene Glycol）Grafted onto the Surface of Cellulose Nanocrystals

以纤维素纳米晶（CNC）为骨架、聚乙二醇（PEG）为功能性侧链、无毒的草酸为偶联剂,采用了一种绿色的合成方法制备出生物可降解的纤维素纳米晶接枝聚乙二醇共聚物（CNC-g-PEG）,然后通过静电纺丝成功制备出了平均直径约为910 nm的纳米纤维该纳米纤维表现出了优异的固-固相变行为,其相变焓最大可达88.2 J/g,结果表明,该纳米纤维能够作为潜在的固-固相变储能材料。

A facile and green synthesis route is presented for preparing a biodegradable cellulose nanocrystal-graft-poly（ethylene glycol）（CNC-g-PEG） copolymers by using CNC as a skeleton,PEG as a functional branch chain,and nontoxic oxalic acid as a coupling reagent.The corresponding nanofibers with an average diameter of about 910 nm have been successfully prepared via electrospinning,and exhibit excellent solid-solid phase transition behavior with the enthalpy of 88.2 J/ g,which indicates the nanofibers can be expected as potential solid-solid phase change heat storage materials.