热处理对桑蚕丝分子组成和性能的影响

以市售桑蚕丝织物为研究对象,分别在50℃、100℃、150℃、200℃和不同处理时间条件下,对丝织物进行加速热老化.利用红外、热重和氨基酸测定手段考察了热老化处理对其组成和性能的影响.结果表明:热老化处理后,桑蚕丝纤维样品的红外特征峰峰值强度随着温度的提高和处理时间的延长而变化,且产生微小位移;热处理使丝纤维的热分解温度降低,缘于热老化后纤维晶区受到破坏、结晶度下降;丝纤维的氨基酸含量随着热处理时间的延长以及热处理温度的增加而变化,表明热老化处过程有化学反应发生.由于化学反应的发生使纤维组成发生变化,致使纤维结构产生破坏和损伤,织物断裂强度下降.

Influence of Heat Treatment on Mulberry Silk Molecular Composition and Performance

Silk fabric was transacted by accelerated thermal aging at the temperature of 50, 150, 100 and 200 ℃ , respecively, with different processing time. The influence of thermal aging treatment on sample composition and performance was investigated by using infrared determination, thermal balance and amino acid determination. The results show that after thermal aging treatment, the infrared characteristic peaks intensity of the samples change with the increase of the treatment temperature and the extension of treatment time, and tiny displacement is produced. The thermal aging treatment makes thermal decomposition temperature of the sample drop because silk crystal has been destroyed resulting in fiber crystallinity dropped. Amino acid content in silk also changed under the different treatment conditions, it is shown that chemical reaction took place in thermal aging process. The chemical reaction results in the change of silk composition, the damage of fiber structure, and the dropping of fabric breaking strength.