Abstract

Acrylic rubber (ACM) nanocomposites reinforced with cellulose nanocrystals (CNCs) were prepared and the properties were characterized. CNCs were produced by hydrochloric acid hydrolysis of microcrystalline cellulose powder and used without further chemical modification of the surfaces. The CNCs were already aggregated in aqueous suspension. However, their aggregated sizes and uniform distribution in the ACM did not change with increase in the concentration of CNC. This result suggested good compatibility of the CNC with ACM. Fourier-transform infrared/attenuated total reflection spectroscopy revealed that the good compatibility could be attributed to attractive interactions between CNC and ACM. The good compatibility led to an increase in breaking stress of the ACM/CNC nanocomposites, up to about 10 MPa at a high concentration of 24 phr of CNC. Thermal decomposition of the nanocomposites occurred due to first the CNC followed by the ACM. More weight residues of the nanocomposites were found above 400 °C with increase in the concentration of CNC. The char produced by the decomposition of CNC is suggested the act as a flame retardant for ACM. In addition, the swelling ratio of the ACM/CNC nanocomposites against hydrophobic solvents decreased with increase in the concentration of CNC. The hydrophilic properties of the unmodified CNC from the surface hydroxyl groups increased the oil-resistant properties of the ACM.

抽象的

制备了纤维素纳米晶体（CNCs）增强的丙烯酸橡胶（ACM）纳米复合材料，并对其性能进行了表征。CNCs通过盐酸水解微晶纤维素粉末生产，无需进一步化学修饰即可使用。CNCs已经在水悬浮液中聚集。但是，它们的聚集尺寸和在ACM中的均匀分布不会随着CNC浓度的增加而改变。该结果表明CNC与ACM具有良好的兼容性。傅里叶变换红外/衰减全反射光谱法表明，良好的相容性可归因于CNC与ACM之间的有吸引力的相互作用。良好的相容性导致ACM / CNC纳米复合材料的断裂应力增加，在24 phr的CNC高浓度下，断裂应力增加到约10 MPa。纳米复合材料发生热分解的原因是首先是CNC，然后是ACM。随着CNC浓度的增加，在400°C以上发现了更多的纳米复合材料重量残留物。建议将CNC分解产生的炭用作ACM的阻燃剂。另外，ACM / CNC纳米复合材料对疏水溶剂的溶胀率随CNC浓度的增加而降低。来自表面羟基的未改性CNC的亲水性提高了ACM的耐油性。建议将CNC分解产生的炭用作ACM的阻燃剂。另外，ACM / CNC纳米复合材料对疏水溶剂的溶胀率随CNC浓度的增加而降低。来自表面羟基的未改性CNC的亲水性提高了ACM的耐油性。建议将CNC分解产生的炭用作ACM的阻燃剂。另外，ACM / CNC纳米复合材料对疏水溶剂的溶胀率随CNC浓度的增加而降低。来自表面羟基的未改性CNC的亲水性提高了ACM的耐油性。