【摘要】 为研究纤维素-壳聚糖共聚产物对石质文物封护保护的可行性,采用自由基聚合法,以过硫酸钾为引发剂,将醋酸丁酸纤维素(CAB)与壳聚糖进行接枝共聚,制备了纤维素-壳聚糖接枝共聚物。同时研究了纤维素和壳聚糖接枝共聚反应的最佳条件:引发剂K2S2O8浓度1.5mmol/L,预处理温度40℃,时间2h,纤维素与壳聚糖的质量比为2:1,反应温度50℃,反应时间8h,交联剂0.12mL,总液体积100mL。分析了纤维素-壳聚糖用量对石质文物封护材料的性能影响,并且对石材试样进行模拟试验,测试分析了色差度、光泽度、接触角、附着力、透气性和耐老化等性能指标,并采用红外光谱、扫描电镜对试样进行表征。结果表明,经纤维素-壳聚糖接枝聚合物浓度为15%的封护材料保护后,石材试样保持了原有的质感、光泽、颜色,并且憎水性、耐老化性等性能得到了大幅提高,对石材试样具有良好的封护效果,为天然高分子在纸质文物保护中的应用开辟了广阔的前景。更多还原

【Abstract】 The graft copolymerization from cellulose and chitosan to prepare antibiosis cellulose material for the protection of stone culture relics was reported. In the experimental process, potassium persulfate was used as the initiator, and the cellulose was graft -copolymerized with chitosan. The grafting conditions and their impact on grafting ratio of the cellulose and grafting efficiency of the chitosan were discussed. According to the results from experimental data, the optimum reaction conditions for graft copolymerization of the cellulose and chitosan were summarized as follows; the consistent concentration of potassium persulfate was 1.5mol/L, the pretreatment temperature and time was 40℃and 2h respectively, the reaction temperature and time was 50℃and 8h, the mass ratio of cellulose and chitosan was 2:1 and the dosage of cross was 0.12ml, the volume of all liquid was 100ml. In the experiment , the effect of copolymer dosage on the properties of stone samples was investigated and analyses of the properties of chromatic aberration, luster, contact angle, coating film adhesion, gas permeability, and ultraviolet radiation repellence were carried out using infrared ray (IR) spectroscopy and scanning electron microscopy (SEM). It was found that the stone samples treated by 15% product copolymerized from cellulose and chitosan glue contained its origin nature, glossiness and color. Meanwhile compared to the untreated stone samples, the contact angle of surface of the treated ones came up to 80°, the level of coating film adhesion was 1 and gas permeability was 1.76μg(m2·d)-1. After 500 hours of ultraviolet - irradiation, the contact angle of surface of the treated stone samples fell to 70°, so the ultraviolet radiation was considerable. It was proved that the product copolymerized from cellulose and chitosan has good effect on the protection of stone historic relic.更多还原