微晶纤维素对HMDI型聚氨酯弹性体性能的影响

Effect of Microcrystalline Cellulose on Properties of HMDI-Type Polyurethane Elastomer

以4,4'-二环己基甲烷二异氰酸酯(HMDI)、聚醚多元醇和1,4-丁二醇(BDO)为主要原料,填料为微晶纤维素(MCC),采用共混方法合成制备了一系列聚氨酯弹性体,研究了微晶纤维素对HMDI型聚氨酯弹性体性能的影响。结果表明:MCC的加入未影响聚氨酯的分子振动;拉伸强度和断裂伸长率随微晶纤维素含量增加先升高再降低,在MCC添加量为15%时,材料的力学性能达到最大;MCC的加入在一定程度上可提高聚氨酯材料阻尼因子,拓宽阻尼温域;MCC的加入提高聚氨酯弹性体的热稳定性。

A series of polyurethane elastomers were synthesized with 4,4＇-dicyclohexylmethane diisocyanate （HMDI） , polyether polyol as the main raw material, 1,4-butanediol （BDO）as the chain extender, mierocrystalline cellulose （MCC） as the filler by blending method. The effects of the addition of microcrystalline cellulose on the properties of polyurethane elastomer were studied especially. The results showed that the polyurethane molecular vibration was not affected by adding MCC;tensile strength and elongation at break first increased and then decreased with microcrystalline cellulose content increased,the mechanical properties of the material reached the maximum when the amount of MCC was added to 15% ;the addition of MCC improved the damping property and broaden the damping temperature range of polyurethane materials to some extent;what＇s more,the addition of MCC improved the thermal stability of the polyurethane elastomer.