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采用L-半胱氨酸(L-Cys)和乙二醇二缩水甘油基乙醚(EGDE)作为加固材料,分别对水解老化和光老化真丝织物进行加固处理,为脆弱丝绸文物的加固保护提供简便而有效的技术方法。水解老化样品在加固后的断裂强力由1.9 N±0.3 N提高到18.0 N±0.4 N,断裂伸长从3.0 mm±0.5 mm提高到14.0 mm±0.5 mm;而光老化样品加固后断裂强力由1.8 N±0.3N提高到4.1 N±0.5 N,断裂伸长保持1.0 mm±0.3 mm不变。通过热重分析、13C固体核磁共振表征发现,水解老化样品加固后的热稳定性有所提高,分子结构有所变化;而光老化样品加固后的热稳定性及分子结构都没有发生明显变化。氨基酸分析证明真丝织物在光老化处理后,可以与EGDE反应的酪氨酸(Tyr)、组氨酸(His)的含量大大降低,造成反应位点的大量减少,因此与水解老化样品的加固效果悬殊。将真丝织物水解老化样品、光老化样品的丝蛋白氨基酸组成及含量与文物样品进行比较发现,水解老化样品的丝蛋白氨基酸组成及含量与文物样品更为接近,因此,可利用该加固方法对脆弱丝绸文物进行加固保护。
L-cysteine (L-Cys) and ethylene glycol diglycidyl ether (EGDE) were used as reinforcing materials to reinforce the hydrolytic aging and photo-aging silk fabrics, respectively, which provided a simple and convenient method for the reinforcement and protection of the fragile silk cultural relics Effective technical methods. The fracture strength of the hydrolyzed aged samples increased from 1.9 N ± 0.3 N to 18.0 N ± 0.4 N after reinforcement, and the elongation at break increased from 3.0 mm ± 0.5 mm to 14.0 mm ± 0.5 mm; while the photo-aging samples strengthened by 1.8 N ± 0.3N increased to 4.1 N ± 0.5 N, elongation at break maintained 1.0 mm ± 0.3 mm unchanged. The thermogravimetric analysis and 13C solid state NMR characterization showed that the thermostability of the hydrolyzed samples increased and the molecular structure changed. However, the thermal stability and the molecular structure of the photo-aged samples did not change significantly. Amino acid analysis showed that the content of tyrosine (His) and histidine (His) which could react with EGDE after photo-aging treatment of silk fabric was greatly reduced, resulting in a large reduction of reaction sites. Therefore, compared with hydrolyzed aging samples, Disparities. Comparing the amino acid composition and content of silk fibroin with silkworm samples, we found that the amino acid composition and content of silk fibroin in hydrolyzed aged samples are more similar to the samples of cultural relics. Therefore, we can use this method of strengthening the fragile Silk artifacts for reinforcement protection.