天然橡胶/杜仲胶并用胶的性能研究

Study on Properties of NR/EUG Blends

将天然橡胶(NR)与杜仲胶(EUG)并用,研究NR/EUG并用比对NR/EUG并用胶(未加补强剂)和白炭黑补强NR/EUG并用胶性能的影响。结果表明:随着EUG用量的增大,NR/EUG并用胶的EUG岛相结构的占比和尺寸增大,表面的“山脊状”纹路越明显;NR/EUG并用比为80/20的NR/EUG并用胶的拉伸强度最大,为28.8 MPa,裂纹扩展速率最小,为23.5 nm·c^(-1);NR/EUG并用比为70/30的NR/EUG并用胶的拉伸疲劳次数最大,为200万。随着EUG用量的增大,白炭黑补强NR/EUG并用胶的邵尔A型硬度、撕裂强度和储能模量增大,拉断永久变形减小;NR/EUG并用比为85/15的白炭黑补强NR/EUG并用胶的切割量较小,压缩温升最低,阿克隆磨耗量最小。

In this study,the blends of natural rubber(NR)and eucommia ulmoides(EUG)were prepared,and effects of NR/EUG blend ratios on the properties of NR/EUG blend(without filler)and silica reinforced NR/EUG blend were studied.The results showed that,the proportion and size of EUG island structure of the NR/EUG blend increased with the increase of EUG amount,and the“ridge”lines on the surface of the NR/EUG blend became more distinct.The tensile strength of the NR/EUG blend with NR/EUG blend ratio of 80/20 was the largest,which was 28.8 MPa,and the crack growth rate was the smallest,which was 23.5 nm·c^(-1).The NR/EUG blend with 70/30 NR/EUG blend ratio had the best tensile fatigue resistance,reaching 2 million fatigue cycles before failure.Moreover,with the increase of EUG amount,the Shore A hardness,tear strength and storage modulus of the silica reinforced NR/EUG blend increased,and the tensile set decreased.The silica reinforced NR/EUG blend with NR/EUG blend ratio of 85/15 had small cutting amount,the lowest compression temperature rise and the lowest Akron abrasion.