Preparation and characterization of β-cyclodextrin grafted silk fabric

ABSTRACT

Silk fabrics were treated by β-cyclodextrin (β-CD) in the presence of citric acid (CA) as crosslinking agent and sodium hypophosphite (SHP) as catalyst using pad dry cure technique. CA is expected to react with β-CD and hydroxyl groups of silk fibroin via esterification reaction. Four independent factors including curing time, curing temperature, β-cyclodextrin, and citric acid concentrations were selected, and effects of these factors on the weight gain of the samples were examined. Fourier transformed infrared spectrometer (FTIR), weight gain, differential scanning calorimetry (DSC), Thermal gravimetric (TGA) and differential thermal analysis (DTA), and field-emission scanning electron microscope (FE-SEM) were employed to confirm the changes of the silk fabrics. The effect of crosslinking reaction on the color changing of samples was investigated by measurement yellowness index of the treated fabrics. The results revealed that the weight gain could reach up to 22% when fabric was treated with 50 g/L β-CD, 100 g/L CA under 170°С for 3 min. FTIR and thermal analysis demonstrated that β-CD had been grafted onto silk fabric successfully.

文摘

以柠檬酸（CA）为交联剂，次亚磷酸钠（SHP）为催化剂，采用PAD干法固化，以β-环糊精（β-CD）处理真丝织物。钙通过酯化反应与丝素的β-CD和羟基反应。选择了固化时间、固化温度、β-环糊精和柠檬酸浓度等四个独立因素，考察了这些因素对样品增重的影响。采用傅立叶变换红外光谱（FTIR）、重量增加法、差示扫描量热法（DSC）、热重分析（TGA）、差热分析（DTA）和场发射扫描电镜（FE-SEM）等手段对真丝织物的变化进行了研究。通过测定处理后织物的黄度指数，研究了交联反应对样品颜色变化的影响。结果表明，织物经50 g/Lβ-CD、100 g/L钙处理170小时后，织物的增重率可达22%以上。FTIR和热分析表明，β-CD已成功接枝到真丝织物上。

Abbreviations CA: citric acid; Β-CD: β-cyclodextrin; SHP: sodium hypophosphite; FTIR: Fourier transformed infrared spectrometer; DSC: differential scanning calorimetry; TGA: thermal gravimetric analysis; DTA: differential thermal analysis; FE-SEM: field-emission scanning electron microscope; BTCA: 1,2,3,4-butane tetracarboxylic acid; MCT-β-CD: mono-chlorotriazine beta cyclodextrin; HFPO: hydroxyl-functional organophosphorus oligomer

KEYWORDS:

• Silk fabric
• β-cyclodextrin
• crosslinking
• carboxylic acid

关键词:

• 丝织物
• β-环糊精
• 交联
• 羧酸