酯化木素用于PBS-CTMP纤维复合材料界面改性的研究

Interfacial Modification Effect of Esterified Lignin in Poly (butylene succinate)-Chemi-thermo Mechnical Pulp Fiber Composites

关键词:  PBS  CTMP纤维  复合材料  酯化木素  界面改性

Key Words:PBS  CTMP fiber  composites  esterified lignin  interfacial modification

摘要:木素与脂肪族酰氯通过酯化反应得到酯化木素,将酯化木素作为界面改性剂改性化学热磨机械浆（CTMP）纤维，并将其应用于聚丁二酸丁二醇酯(PBS)-CTMP纤维复合材料,研究了酯化木素对改性后CTMP纤维制备复合材料性能的影响。接触角测定数据表明,与未反应木素相比,酯化木素的疏水性提高。PBS-CTMP纤维复合材料的力学性能显著提高,以质量分数为2.0%(相对于纤维)的酯化木素(以棕榈酰氯,n(—COCl)∶n(—OH)=3∶2合成)表面处理的纤维制备的复合材料,拉伸强度、冲击强度和弯曲强度分别较未处理CTMP纤维制备的复合材料提高了25.1%、22.4%和19.3%。扫描电镜（SEM）分析表明,以酯化木素处理过的纤维与基体之间,表现出更好的相容性。另外,在复合材料制备中加入酯化木素改性CTMP纤维,使复合材料的剪切黏度表现出一定程度的增加,但总体而言,在复合材料体系中添加酯化木素改性CTMP纤维对其加工性能影响不大。

Abstract:Aliphatic chains were introduced into the macromolecule of soda lignin using aliphatic acyl chlorides as esterification reagents. The data of contact angle showed that the hydrophobicity of esterified lignin (EL) was enhanced as compared to the original lignin. EL was further used as interfacial modifier in poly (butylene succinate) (PBS)-chemi-thermo mechnical pulp (CTMP) fiber composites. As a result, the composites with enhanced mechanical properties were obtained, the tensile, impact and bending strengths were increased by 25.1%, 22.4% and 19.3%, respectively compared with those of the specimen without any treatment when 2% EL (on fiber) (synthesized by palmitoyl chloride, n(—COCl)∶n(—OH)=3∶2) was used. Furthermore, the improved interfacial bonding between treated fibers and matrix was verified by SEM images. The shear viscosity of composite was increased due to the addition of EL at the beginning of processing procedure, but in general, the rheological behaviors of composites were not significantly changed.