Synthesis and properties of optically active nanostructured polymers bearing amino acid moieties by direct polycondensation of 4,4′-thiobis(2-tert-butyl-5-methylphenol) with chiral diacids
作者:Shadpour Mallakpour、Samaneh Soltanian
DOI:10.1007/s00726-011-0958-3
日期:2012.6
acid as diacid monomers and were used with the aim to obtain a new family of amino acid based poly(ester-imide)s (PEI)s. The polymerization was performed by direct polycondensation of chiral diacids (4a–4d) with 4,4′-thiobis(2-tert-butyl-5-methylphenol) (5) in the presence of tosyl chloride (TsCl), pyridine and N,N-dimethyl formamide (DMF). Step-growth polymerization was carried out by varying the
通过偏苯三酸酐(1)与乙酸中的1-氨基酸(2a-2d)作为二元酸单体反应,制备了N -trimellitylimido- 1-氨基酸(4a-4d)的四种衍生物,并用于此目的。获得基于氨基酸的聚(酯酰亚胺)(PEI)的新家族。聚合反应是在甲苯磺酰氯(TsCl),吡啶和N存在下,将手性二元酸(4a-4d)与4,4'-硫代双(2-叔丁基-5-甲基苯酚)(5)直接缩聚进行的, ñ-二甲基甲酰胺(DMF)。通过改变加热时间进行逐步生长聚合,并且达到TsCl /二酸的摩尔比并达到最佳条件。借助特定的旋转实验,FT-IR,1 H-NMR,X射线衍射技术和元素分析对合成的聚合物进行了表征。通过场发射扫描电子显微镜研究获得的聚合物的表面形态。结果显示了所得聚合物的纳米结构形态。所得PEI可溶于极性非质子溶剂,例如DMF,N,N-二甲基乙酰胺,二甲基亚砜,N-甲基-2-吡咯烷酮和质子溶剂,例如硫酸。通过热重分