3,3二(叠氮甲基)氧丁环与四氢呋喃共聚醚弹性体硬段结构组成对其力学性能影响
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国家自然科学基金资助项目(51473022)


Effect of Hard Segment Composition of 3,3-Diazidomethyloxetane-Tetrahydrofuran Copolyethers Elastomer on Its Mechanical Properties
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    摘要:

    为探索3,3-二叠氮甲基氧丁环-四氢呋喃共聚醚[Poly(BAMO-THF)] 弹性体中硬段结构组成对力学性能的影响,以甲苯二异氰酸酯(TDI)为固化剂,调节扩链剂1,4-丁二醇(BDO)与交联剂三羟甲基丙烷(TMP)添加比制备了一系列固化参数与硬段含量不变、硬段组成不同的Poly(BAMO-THF)弹性体S1~S5。力学性能测试表明,随BDO含量增加、TMP含量下降,弹性体拉伸模量由S1的(0.83±0.05) MPa单调降至S5的(0.51±0.02) MPa,断裂延伸率由S1的526%±50%单调增至S5的950%±60%,拉伸强度维持恒定((2.52±0.39) MPa~(2.75±0.31) MPa)。溶胀测试表明,弹性体S1~S5平衡溶胀率随TMP含量下降呈单调上升,化学交联程度下降。低场核磁研究表明,弹性体S1~S5表观硬段含量随TMP含量下降呈单调上升。红外分析表明,随TMP含量下降弹性体中羰基与氨基氢键缔合程度增加,弹性体的物理交联程度提高。

    Abstract:

    In order to explore the effect of hard segment composition of 3,3-diazidomethyloxetane-tetrahydrofuran copolyethers (poly (BAMO-THF))polyurethane elastomer on its mechanical properties, using toluene diisocyanate (TDI) as curing agent, a series of poly (BAMO-THF) polyurethane elastomers S1~S5 with the same curing parameters, the same hard segment content and different compositions of hard segment were prepared by adjusting the addition ratio of the chain extender 1,4-butanediol (BDO) and cross-linking agent trimethylolpropane (TMP). The mechanical properties test shows that, with the increase of BDO content and the decrease of TMP content,the tensile modulus of poly (BAMO-THF) polyurethane elastomers decrease monotonously from (0.83 ±0.05) MPa of S1 to (0.51±0.02) MPa of S5, the elongation at break increases monotonously from 526%±50% of S1 to 950%±60% of S5, and the tensile strength at break remains almost constant (2.52 ±0.39) MPa~(2.75±0.31) MPa. Swelling test shows that the equilibrium swelling ratio of elastomers S1 ~ S5 is increased monotonously with the decrease of TMP content, and the degree of chemical crosslinking is decreased gradually. Low field NMR reveals that the apparent hard segment content of elastomers S1~S5 increases monotonously with the decrease of TMP content. FT-IR analysis indicates that the degree of association of carbonyl and amino hydrogen bonds in poly (BAMO-THF) elastomers increases gradually with the decrease of crosslinking agent content, which increases the degree of physical crosslinking of the elastomers.

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耿 泽,郭晓燕,丁腾飞,翟进贤,赵翰鹏.3,3二(叠氮甲基)氧丁环与四氢呋喃共聚醚弹性体硬段结构组成对其力学性能影响[J].高分子材料科学与工程,2020,36(6):1-6.

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