摘要
首先以四氢呋喃均聚醚(PTMG)和4,4'–二苯基甲烷二异氰酸酯(MDI-100)为原料合成聚氨酯(PU)预聚体,再用1,4–丁二醇(BDO)扩链剂制备热塑性聚氨酯(TPU)弹性体。讨论了预聚体扩链系数、软段相对分子质量以及NCO含量对TPU弹性体力学性能的影响。结果表明:当预聚体的NCO含量基本相同时,随扩链系数增大,TPU弹性体的硬度变化不大,断裂伸长率、拉伸强度、300%模量和撕裂强度都先升高后降低;当预聚体的NCO含量基本相同时,软段Mn=1000的TPU弹性体比软段Mn=2000的TPU弹性体300%模量和拉伸强度高,而断裂伸长率较低;提高预聚体NCO含量可使TPU弹性体的断裂伸长率下降,而硬度、撕裂强度、300%模量和拉伸强度明显提高。
First,the polyurethane(PU)prepolymer was synthesized by using tetrahydrofuran homopolyether(PTMG)and 4,4'-diphenylmethane diisocyanate(MDI-100)as raw materials,and then the thermoplastic polyurethane(TPU)elastomer was prepared with 1,4-butanediol(BDO)chain extending agent.The influence of chain extending coefficient of prepolymer,relative molecular mass of soft segment and content of NCO on the mechanical performance of TPU elastomer was discussed.The results show that when the NCO content of prepolymer is almost same,with increasing of the chain extending coefficient,the hardness of TPU elastomer changes little,the elongation at break,tensile strength,300%modulus and tear strength all first increase and then decrease.When the NCO content of prepolymer is almost same,the 300%modulus and tensile strength of TPU elastomer with Mn=1000 soft segment are higher than those of TPU elastomer with Mn=2000 soft segment,but the elongation at break is lower.Increasing the NCO content of prepolymer can decrease the elongation at break of TPU elastomer,but the hardness,tear strength,300%modulus and tensile strength significantly increase.
作者
张倩
郝亚暾
Zhang Qian;Hao Yatun(Shanxi Provincial Institute of Chemical Industry(Co.,Ltd.),Taiyuan 030021,China)
出处
《化学推进剂与高分子材料》
CAS
2019年第6期74-76,共3页
Chemical Propellants & Polymeric Materials
