摘要
为了研究固化剂化学结构对3,3-双叠氮甲基氧丁环-四氢呋喃共聚醚(PBT)弹性体力学性能的影响,分别以六亚甲基二异氰酸酯(HDI)与水的加成产物N100、三羟甲基丙烷与HDI混合物(TMP/HDI)为固化剂,通过与PBT反应制备得到不同固化剂交联的PBT弹性体。采用力学、低场核磁、红外分析方法,考察了异氰酸酯固化剂结构对PBT弹性体力学性能的影响规律。结果表明:相同化学交联网络密度下,PBT-N100弹性体S0的断裂拉伸强度为(0.983±0.03)MPa,延伸率为(110±7)%,初始拉伸模量为(1.80±0.02)MPa;PBT-TMP/HDI弹性体S4的断裂拉伸强度为(1.43±0.08)MPa、延伸率为(336±6)%,初始拉伸模量为(1.26±0.01)MPa。PBT-N100弹性体S0网链物理交联强度高于S4。N100中脲羰基与氨基较强的氢键作用提高了PBT弹性体网链间的物理相互作用,使得弹性体S0拉伸模量高于S4、延伸率低于S4。
To investigate the influence of chemical structure of curing agent on the mechanical property of 3,3-diazidomethyloxetane-tetrahydrofuran copolyethers(PBT) elastomer,N100,the addition product of hexamethylene diisocyanate(HDI) and H2O,and the mixture of trimethylolpropane and HDI(TMP/HDI),were used as curing agent respectively to produce two type of cross-linked PBT elastomer. Results show that in the same chemical crosslinking network,the tensile strength,tensile strain at break and initial modulus of PBT-N100 elastomer S0 are(0.983±0.03)MPa,(110±7)% and(1.80±0.02)MPa,respectively,while the PBT-TMP/HDI elastomer S4 are(1.43±0.08)MPa,(336±6)% and(1.26±0.01)MPa,respectively. The tensile modulus of elastomer S0 is higher than that of elastomer S4,as its elongation at break and tensile strength poorer than that of S4. Low field NMR reveals that the physical crosslinking strength of PBT-N100 elastomer S0 network chains is higher than that of S4. The strong hydrogen bonding between urea carbonyl group and amidogen in N100 enhances the physical interaction among PBT elastomer network chains,resulting in the tensile modulus of elastomer S0 higher than that of S4,while its elongation at break lower than that of S4.
作者
丁腾飞
翟进贤
郭晓燕
耿泽
DING Teng⁃fei;ZHAI Jin⁃xian;GUO Xiao⁃yan;GENG Ze(School of materials science and engineering,Beijing Institute of Technology,Beijing 100081,China)
出处
《含能材料》
EI
CAS
CSCD
北大核心
2020年第1期56-61,共6页
Chinese Journal of Energetic Materials
基金
国家自然科学基金(51473022)
