EVA/硅橡胶共混材料的阻尼性能研究

以甲基乙烯基硅橡胶和乙烯-醋酸乙烯酯共聚物(EVA)为原料,通过熔融共混法制得EVA/硅橡胶共混材料,研究了EVA用量对共混材料力学性能、阻尼性能、热稳定性和拉伸断面形貌的影响。结果表明,随着EVA用量从10份增加到40份,共混材料的拉伸强度从6.6 MPa降至5.1 MPa,撕裂强度从21.9 kN/m降至17.6 kN/m,拉断伸长率从438%升至467%后降至448%,邵尔A硬度从64度升至65度后降至60度,吸收能量从1368 N/mm降至996 N/mm后升至1057 N/mm,损耗角从12.9°升至16.4°后降至15.1°。当EVA用量为30份时,材料的损耗角达到最大值16.4°;EVA的加入在一定程度上降低了材料的热稳定性;EVA与硅橡胶在一定条件下表现出良好的相容性。

Research on Damping Performance of EVA/Silicone Rubber Blends

EVA/silicone rubber blends have been prepared by melt blending with methyl vinyl silicone rubber and ethylene-vinyl acetate copolymer(EVA)as raw materials.Effect of EVA content on the mechanical and damping properties,and thermal stability and tensile profile morphology are discussed.Results showed that as EVA increases from 10 phr to 40 phr,the tensile strength of the blends decreases from 6.6 MPa to 5.1 MPa,the tear strength decreases from²1.9 kN/m to 17.6 kN/m,and the elongation at break increases from 438%to 448%,the Shore hardness rises from 64 A to 65 A,and then drops to 60 A,and the absorbed energy drops from 1368 N/mm to 996 N/mm and then rises to 1057 N/mm,the loss angle rises from 12.9°to 16.4°first and then drops to 15.1°.When EVA is 30 phr,the blends have the maximum loss angle of 16.4°;the addition of EVA reduces the thermal stability of the blends to a certain extent.Both EVA and silicone rubber show good compatibility.