没食子酸/乙二胺共沉积聚酯纤维制备及其成纸性能

赋予疏水性聚酯短切纤维亲水性能，可拓展其应用价值。本文提出在碱性Tris缓冲液中，使没食子酸与乙二胺通过迈克尔加成或席夫碱反应共沉积在聚酯短切纤维表面。测定了改性前后聚酯短切纤维的动态接触角，采用扫描电子显微镜（SEM）观察了纤维的微观形貌，利用傅里叶变换红外光谱（FT-IR）和X射线光电子能谱（XPS）表征了纤维表面结构的变化，最后以改性前后聚酯短切纤维和阔叶木浆抄纸，测定了纸张的孔径分布变化和透气性，并测试了纸张物理性能。结果表明：经共沉积改性后的聚酯短切纤维表面存在大量羟基，纤维表面有氮元素生成，同时表面粗糙度提高，与未改性聚酯短切纤维相比，改性后聚酯短切纤维与去离子水的接触角降低了57.2?，显著改善了纤维亲水性；与未改性纤维纸页相比，改性后纤维纸页抗张强度提高35.2%，湿强度提高43.3%，透气度提高11.1%，相同孔径范围内孔径增加了24%-30%，纤维分散性明显提高。本研究成果可制得亲水性优良的聚酯纤维，并可用于高性能纸张的应用。

Preparation of gallic acid/ethylenediamine co-deposited polyester fiber and its paper-forming properties

Endowing hydrophobic polyester chopped fiber with hydrophilic properties can expand its application value. This article proposes that gallic acid and ethylenediamine are co-deposited on the surface of polyester chopped fibers by Michael addition or Schiff base reaction in alkaline Tris buffer. The dynamic contact angles of polyester chopped fibers before and after modification were measured, and the micro morphology of the fibers was observed by scanning electron microscope (SEM),Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) The changes in the surface structure of the fibers were characterized. Finally, the polyester chopped fiber and hardwood pulp were used to make paper before and after the modification. The pore size distribution changes and air permeability of the paper were measured, and the physical properties of the paper were tested. The results show that there are a large number of hydroxyl groups on the surface of the polyester chopped fiber after co-deposition modification, nitrogen is generated on the surface of the fiber, and the surface roughness is improved. Compared with the unmodified polyester chopped fiber, the modified polyester The contact angle between chopped fiber and deionized water is reduced by 57.2?, which significantly improves the hydrophilicity of the fiber. Compared with the unmodified fiber paper, the tensile strength of the modified fiber paper is increased by 35.2%, and the wet strength is increased by 43.3. %, the air permeability increased by 11.1%, the pore diameter increased by 24%-30% within the same pore diameter range, and the fiber dispersion was significantly improved. The results of this research can produce polyester fibers with excellent hydrophilicity and can be used in high-performance paper applications.