Properties of NR/Modified Sisal Cellulose Microcrystalline Composites
Sisal cellulose microcrystalline(SCF)was extracted using sisal cellulose as raw material,stearic acid modified sisal cellulose microcrystalline(SA-g-SCF)was prepared using stearic acid(SA)as the modifier,and the effect of SA-g-SCF dosage on the properties of natural rubber(NR)/SA-g-SCF composites was studied.The results showed that,with the increase of SA-g-SCF dosage,the Fmax-FL of NR/SA-g-SCF composite increased,and the t90 showed an extended trend.Compared with NR compound without SA-g-SCF,the t90 of NR/SA-g-SCF composite with 5 phr SA-g-SCF was almost unchanged,but the vulcanization rate index increased.With the increase of SA-g-SCF dosage,the Shore A-type hardness,modulus at 100% elongation and modulus at 300% elongation of NR/SA-g-SCF composite increased and the tensile strength first increased and then decreased.NR/SA-g-SCF composite with 5 phr SA-g-SCF showed no obvious aggregates on the cross-section and had the highest tensile strength(25.4 MPa),with the best overall performance.
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