采用硫酸酸解微晶纤维素（MCC）的方法制备了纳米微晶纤维素（NCC），并将其作为填料部分替代白炭黑（SiOz），制备了纳米微晶纤维素一白炭黑／天然橡胶（（NCC—SiO。）／NR）复合材料。结果表明，NCC的加入在保持SiO2增强NR基本力学性能的同时，使压缩永久变形由11．4％下降到5．9％，压缩疲劳生热则由19．9℃下降至10．6℃。当NCC与sioz的质量比为10：20时，（NCC—SiO2）／NR复合材料的一级和六级龟裂屈挠次数分别由Si02／NR的2．5×10、6．0×10。次提高到7．0×10、1．2×10次；老化性能也优于Si02／NR复合材料，老化后拉伸强度、撕裂强度及硬度分别上升了40％、21％和25％，永久变形下降了25％，拉伸强度和断裂伸长率则基本不变；动态力学性能测试结果表明，NCC与SiOz的质量比为0：30-20：10时，复合材料0℃的胶料抗湿滑性能tan占基本不变，而60℃胶料的滚动阻力tan艿却由0．060下降至0．049。SEM结果表明：NCC—SiO2在NR的分散性优于SiO2，与NR基体界面结合更加紧密。
Nanocrystalline cellulose （NCC） was prepared from hydrolysis of microcrystalline cellulose （MCC） using sulfuric acid. NCC can be used as filler partialy to replace SiO2 and utilized in the preparation of （NCC- SiO2 ）/NR （natural rubber） composites. The results show that the composites can not only maintain basic mechanical properties, but also decrease heat build-up from 19.9℃ to 10.6 ℃ and permanent set from 11.4% to 5.9%. When the mass ratio was added with NCC ： SiO2 =10 ： 20, the grade one and six flex cracking times of （NCC - SiO2 ）/NR composite material increase from 2.5 × 104 and 6.0×104 （filled by SiO2 ） to 7.0 × 104 and 1.2× 105 , respectively. Aging performance is also superior to SiO2/NR composite materials. After hot air aging, the tensile strength, tear strength and hardness of the composite materials after aging increase by 40 %, 21 % and 25 %, respectively, and the permanent deformation droppes by 25 %, while tensile strength and elongation at break remain basically unchanged. Dynamic mechanical performance test shows that when the mass ratio of NCC to SiO2 is from 0 ： 30 to 20 ： 10, the rolling resistance of rubber tan8 at 0 ℃ keep almost constant, but the skid resistance of rubber tan8 at 60 ℃ droppes from 0. 060 to 0. 049. The results of SEM photographs prove that better dispersion and stronger interfacial interaction were achieved in NR matrix filled by NCC - SiO2 than by SiO2.
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