【作者】 刘凉冰； 刘红梅； 贾林才；

【Author】 Liu Liangbing,Liu Hongmei, Jia Lincai (Shanxi Provincial Institute of Chemical Industry,Taiyuan 030021,China)

【机构】 山西省化工研究所；

【摘要】 采用二步法以聚己二酸丁二醇酯(PBA)、4,4-二苯基甲烷二异氰酸酯(MDI)和二元醇1, 4-丁二醇或三元醇混合扩链剂合成了聚氨酯(PU)弹性体。研究了软段相对分子质量、预聚体NCO质量分数和交联剂对聚氨酯弹性体力学性能的影响。结果表明,PBA相对分子质量大,PU扯断伸长率和冲击弹性好。PU硬度、撕裂强度和模量随预聚体NCO基质量分数增加而增加。弹性体的交联密度高,硬度和撕裂强度下降。更多还原

【Abstract】 Aseries of polyurethaner(PU) elastomer were synthesized from poly(tetramethlene adipate) glycol,4,4’-diphenyl-methane-diisoyanate(MDI) ,1,4-butanediol(BDO) or trimethylolprpane(TMP) . The influence of molecular weight of soft segment, mass fraction of NCD in perpolymer and crosslinking agent on the mechanical properties of the PU was studied. The results showed that when the molecular weight of PBA increased,the elongation at break and resilience of PU increased. The hardness, tear strength and modulus of PU increased with the increase of the content of NCD in prepolymer. .With the increase of degree of chemical crosslingking,hardness and tear strength of PU decreased.更多还原