Cellulose whisker (CW) was prepared by hydrolysis of natural microcrystalline cellulose(MCC) with sulfate acid.The NR/CW composite was prepared by natural rubber (NR) latex coagulated with CW suspension.The results show CW has well reinforcement effect to NR.The modulus

elongation at break

tear strength of NR composites are further improved by using CW modified by resorcinol (R) and hexamethylene tetraamine (H).The mechanical properties of hot air aging (100℃

72 h) of NR/CW composite vulcanizates are markedly superior to those of NR.The tensile strength of NR/RH-CW composites was dropped from 28.54 MPa to 21.78 MPa

the rate of change was down to 23.7%

and the elongation at break decreased from 594% to 493% and the change rate decreased to 17.0%.The tensile strength of pure NR was dropped from 22.02 MPa to 2.40 MPa

and the change rate was 89.1%;and the elongation at break was dropped from 579% to 168% and the change rate was 71.0%.SEM photo shows the interface compatibility between RH-CW and NR matrix was improved in comparion with CW and NR.TGA results show the 5% weight loss temperature of composites is decreased and the residue increases with CW adding.In addition

there is a peak of the derivative TGA curve at 520℃

and the peak becomes larger and the residue increases with RH-CW adding.