基于聚天冬氨酸酯的磺酸盐型聚脲分散体的合成与表征

Synthesis and characterization of sulfonate polyurea dispersions based on polyaspartic ester

以马来酸二丁酯(DBM)和己二胺(HDA)为原料,通过Michael加成反应合成了天冬氨酸酯二聚物(AE);AE与己二异氰酸酯(HDI)反应制得含末端仲胺和乙内酰脲环的聚天冬氨酸酯聚脲低聚物(PAE);以N-(2-氨基乙基)-2-氨基乙磺酸钠(AAS)为亲水单体,PAE、异佛尔酮二异氰酸酯(IPDI)、乙二胺(EDA)为原料,采用丙酮法合成了磺酸盐型聚脲分散体(PUD)。采用FT-IR表征了AE和PAE的结构;聚脲分散体的ζ电位处于-48～-58 mV之间,具有良好的稳定性;随着亲水单体含量的增加,分散体黏度增加,平均粒径减小;TEM结果显示分散体胶粒为大小不一的球形结构,呈多元分布;拉伸实验表明聚脲分散体胶膜断裂伸长率大于450%;邵氏硬度在40～50之间;TGA显示其起始分解温度约为200℃,至450℃聚合物基本分解完毕。

Aspartic ester dimer（AE）was synthesized by Michael addition reaction between maleic acid dibutylester（DBM）and 1,6-hexamethylene diamine（HDA）.Then AE reacted with 1,6-hexamethylene diisocyanate（HDI）to make polyaspartic ester（PAE）,which contained hydantoin groups and secondary amine.Sulfonate polyurea dispersions（PUD）were prepared from N-（2-aminoethyl）-2-amino ethanesulfonic sodium（AAS）as the hydrophilic monomer,PAE,isophorone diisocyanate（IPDI）and ethylenediamine（EDA）by the acetone method.The structures of AE and PAE were confirmed by FT-IR spectroscopy.The Zeta potentials of polyurea dispersions were between-48 mV and-58 mV,and PUD displayed good stability.As the content of hydrophilic monomer increased,the viscosity increased while the average particle size decreased.TEM analysis showed that the morphology of the particles were spherical with different sizes.The results of tension test showed that the ultimate elongation of PUD films were more than 450%.Shore hardness was between 40 and 50.TGA showed that the initial decomposition temperature of polyurea film was around 200℃,and complete decomposition was basically at 450℃.