聚丁二烯聚氨酯弹性体的合成及性能研究

Study on synthesis and performance of polybutadiene based polyurethane elastomer

采用一步法将阴离子端羟基聚丁二烯(HTPB)分别与L-赖氨酸三异氰酸酯(LTI)和JQ1(主要组分为4,4',4"-三苯甲烷三异氰酸酯)胶进行反应,制备出了交联型聚氨酯弹性体。测定了弹性体的玻璃化转变温度(T_g)和拉伸性能,并用红外光谱(FT-IR)对其结构进行了表征。结果表明,若阴离子HTPB主链中1,2-结构相对含量较高,则其弹性体的T_g较高;如果阴离子HTPB的分子质量较高,则其弹性体的拉伸强度较低,而断裂伸长率增加。

The crosslinked polyurethane elastomers were prepared by the one step reaction of anionic HTPB and 2,6-diisocyanatohexanoic acid 2-isocyanatoethyl ester(LTI) or JQ1 gum(its main component is triphenylmethane 4,4',4''-triisocyanate). The glass transition temperature( T_g) and tensile properties of the elastomers were measured and their structure was characterized using IR spectra. The results show that the higher the relative content of 1,2-structure of anionic HTPB backbone, the higher the T_g of elastomer; when the molecular weight of anion HTPB increases, the tensile strength of elastomer d ecreases, and the elongation at break increases.