聚羧酸交联棉纤维的微隙结构

Pore structure of cotton fiber crosslinked with polycarboxylic acid

采用马来酸与衣康酸共聚制备的聚羧酸型无甲醛免烫交联剂(简称LMP)对液氨处理后的棉织物进行交联处理,以扫描电镜、X-射线衍射和反相凝胶渗透色谱法,分别测定了交联前后棉纤维的形态结构、结晶结构和微隙结构。试验结果表明:经LMP交联后,纤维表面光滑度下降;结晶度降低,由54.17%降至47.02%。LMP交联处理(轧液率80%)棉织物,纤维的微隙结构比未交联的和标样对应孔径的孔隙体积都降低25%左右,因此它们的孔隙分布曲线形状相似;交联处理的轧液率为60%的棉织物,纤维微隙结构中孔径小于25.2A的孔隙体积增加,孔径为38.1~74.4 的孔隙体积明显减少。测定马来酸依康酸在位聚合-交联棉织物试样的纤维微隙结构,并与LMP交联的作比较。

Polycarboxylic acid synthesized from maleic acid and itaconic acid, namely LMP, is used as a formaldehyde-free durable press finishing agent to finish liquid ammonia-treated cotton fabrics. The mor- phology, crystallinity and pore structure of fabrics before and after crosslinked with LMP are investigat- ed by scanning electron microscopy, X-ray diffraction analysis and reverse phase gel permeation chroma- tography. The results show that the morphology of cotton fiber becomes a little rough and the crystallini- ty decreases from 54.17% to 47.02% after being crosslinked with LMP. Compare with untreated cotton fabric, for LMP crosslinked fabric with 80% wet pick-up, volumes of all sized pores are decreased about 25%. Hence the appearances of pore distribution curves for LMP crosslinked and untreated fabrics are similar. When wet pick-up is 60%, the volumes of pores with diameter smaller than 25.2 A are in- creased, meanwhile the volumes of pores with 38.1-74.4 A, diameter are reduced obviously. Pore struc- ture of cotton fabrics crosslinked with MA/IA in-situ copolymerizing and crosslinking system is mea- sured and compared with that of LMP crosslinked fabrics.