Fibrillation Property of the Lyocell Fibers Treated by N-hydroxymethyl Cross-linking Agents

Lyocell fibers are subject to fibrillate under wet conditions, which severely affects the appearance of this kind of fabrics. Cross-Unking treatment is an important way to prevent fibrillation of lyocell fibers. In this study, two kinds of traditional N-hydroxymethyl cross-linking agents were used to treat lyocell fibers and the wet abrasion values of lyocell fibers were measured in a wet abrasion test. The results show the wet abrasion values of lyocell fibers increase with the increasing concentration of the cross-linking agents, which indicates the anti-fibrillation property of the treated fibers has been improved. But the mechanical properties of the treated fibers decreased in some extent. The FT-IR spectroscopy analysis shows that the lyocell fibers have cross-linked with cross-linking agents. The SEM analysis results show the fibers treated by 4% DMDHEU or 5% SECO have good anti-fibrillation properties.     

STUDY ON FUNCTIONAL GROUPS OF CARBON FIBER SURFACE

Rayon-based carbon fibers were anodically oxidized in the presence of a variety of electrolytes. The functional groups produced on carbon fiber surface were characterized by Fourier Transform Infrared Spectroscopy (FTIR). Both K Br pellet spectra and ATR difference spectra indicate that carboxyl and phenolic and carbonyl groups were produced. The acidic groups, carboxyl and phenol, were measured by potentiometrie titration with standard solutions of acid and alkali. The results show that the amount of acidic groups is related to the electrolyte used.     

碳纤维在不同电解质溶液中的电化学特性

研究了碳纤维在无机酸及其相应盐溶液中的循环伏安特性.结果表明,碳纤维在酸性溶液中呈现出最大的双电层充电电流,在碱性溶液中的双电层充电电流较中性溶液中小.碳纤维在酸性溶液中经过电化学氧化可以形成比在碱性和中性溶液中多的表面氧化产物.     

阳离子分散剂疏水链结构对水性超细涂料性能的影响

利用微射流制备水性阳离子超细涂料体系,研究不同疏水链结构的季铵盐阳离子分散剂对超细涂料体系的性能影响.结果表明,微射流处理30min平均粒径可达200nm且分布均匀,Zeta电位接近50mV.疏水链为十四烷基时离心稳定性最高可以达到75%,Zeta电位随着疏水链的增加而升高,粒径和黏度在达到饱和吸附之后则变化不大.