天然橡胶/改性碱木素复合材料的制备及性能研究

Preparation and property of natural rubber/modified alkaline lignin composites

对碱木素进行羟甲基化改性,并以此为原料制备天然橡胶/改性碱木素复合材料。研究了复合材料的力学性能、热稳定性、加工性能以及碱木素的微观形貌。结果表明:当甲醛用量为1.0mol/kg碱木素,改性碱木素添加量为10%,丙三醇添加量为6g/100g改性碱木素时,复合材料的力学性能最优。热重分析显示:天然橡胶和复合材料的热稳定性十分接近,复合材料的成炭量有所增加。橡胶加工性能分析(RPA)表明:碱木素经改性后,在天然橡胶中的分散性得到了改善,与天然橡胶基体的相容性得到了提高;复合材料的储能模量、损耗模量和损耗因子增加。

Alkaline lignin modified by formaldehyde, NR/modified alkaline lignin were successfully prepared. The mechanical properties, thermal stability, processing proterties of composites and micromorphology of alkaline lignin were in vestigated. When the amount of modified alkaline lignin was 10% of the weight of NR,the content of formaldehyde was 1. 0moi per 1000g alkaline lignin and the content of glycerin was 6g per 100g modified alkaline lignin, NR/ modified alkaline lignin composites had the best mechanical properties. Natural rubber and composites were very close to the thermal stability by thermo gravimetric analysis, the addition of modified alkaline lignin increased the charing ability of the composites. The analyses of processing property indicated the dispersibility of alkaline lignin was increased and the compatibility between alkaline lignin and NR was improved after modification. G＇,G＇＇ and tan3 of composites were increased.