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以羟基化碳纳米管(CNT-OH)为交联剂,环氧乙烷-四氢呋喃共聚醚(P(E-CO-T))为预聚物,甲苯二异氰酸酯(TDI)为固化剂,制备了碳纳米管(CNT)交联改性的P(E-CO-T)热固性聚氨酯弹性体,并进行了相关性能表征。当CNT-OH的质量分数为1.5%时(质量分数),弹性体拉伸强度可达12MPa,延伸率为750%;溶度参数为21.43J1/2/mL1/2,与常用硝酸酯增塑剂的溶度参数相差均小于2J1/2/mL1/2,表现出良好的相溶性;玻璃化转变温度(Tg)为-50℃;在玻璃化转变区域,弹性体的储能模量(E’)降低,损耗模量(E’)出现峰值,力学损耗(tanδ)不断增大。在-18℃~20℃之间E’出现肩峰,归属于氨基甲酸酯硬段的玻璃化转变。
Using ethylene glycol-tetrahydrofuran copolyether (P (E-CO-T)) as the prepolymer and hydroxyethylmercaptoacetate (TDI) as the crosslinking agent, The P (E-CO-T) thermosetting polyurethane elastomer crosslinked by carbon nanotubes (CNTs) was characterized and characterized. When the mass fraction of CNT-OH is 1.5% (mass fraction), the tensile strength of the elastomer reaches 12MPa and the elongation is 750%. The solubility parameter is 21.43J1 / 2 / mL1 / 2. Compared with the common nitrate plasticizer The solubility parameters of the agents were all less than 2J1 / 2 / mL1 / 2, which showed good compatibility. The glass transition temperature (Tg) was -50 ℃. In the glass transition region, the storage modulus ’), The loss modulus (E’) peaks and the mechanical loss (tan δ) increases. Shoulders appeared at E ’between -18 ° C and 20 ° C, belonging to the glass transition of the carbamate hard segment.