Synthesis and characterization of heat-resistant and soluble poly(amide-imide)s from unsymmetrical dicarboxylic acid containing 2-(triphenyl phosphoranylidene) moiety and various aromatic diamines
作者:SEEMA AGRAWAL、ANUDEEP KUMAR NARULA
DOI:10.1007/s12039-015-0830-1
日期:2015.4
An unsymmetrical and non-coplaner heterocyclic phosphorus containing dicarboxylic acid monomer, (DCA-3) is successfully synthesized with high purity. A series of novel aromatic poly(amide-imide)s having ether or/sulphur or/fluorine or/phosphorus containing phenyl moieties in their backbone are then prepared via a direct phosphorylation polycondensation of synthesized dicarboxylic acid with various aromatic diamines. Chemical structures of DCA-3 as well as resulting polymers are confirmed by FT-IR, NMR spectroscopic techniques and elemental analysis. These polymers are readily soluble in a variety of aprotic polar solvents such as NMP, DMSO, DMAc and DMF, etc. UV spectra showed that all poy(amide-imide)s films exhibit high optical transparency. In addition, the glass transition temperatures (Tg) of these polymers were determined by differential scanning calorimetry and found in the range 271–346∘C. Furthermore, thermogravimetric analysis of these polymers showed good thermal stability, 10% weight loss at temperature in excess of 538∘C and char yield at 700∘C in nitrogen ranging from 68 to 79%. From wide-angle X-ray diffraction experiments, all polymers showed amorphous behaviour.
一种不对称且不共面的含磷杂环二羧酸单体(DCA-3)被成功合成,并具有高纯度。随后,通过将合成的二羧酸与多种芳香族二胺进行直接磷酸化缩聚,制备了一系列具有醚、硫、氟或磷含苯基部分的全新芳香族聚酰亚胺。DCA-3及其所得聚合物的化学结构通过红外光谱(FT-IR)、核磁共振(NMR)光谱技术和元素分析得到确认。这些聚合物在各种极性非质子溶剂中易溶解,如NMP、DMSO、DMAc和DMF等。紫外光谱显示,所有聚酰亚胺薄膜均表现出高光学透明性。此外,使用差示扫描量热法(DSC)测定了这些聚合物的玻璃转变温度(Tg),发现其范围在271–346°C之间。此外,聚合物的热重分析显示出良好的热稳定性,10%的重量损失发生在超过538°C的温度下,700°C时在氮气中残炭率在68%到79%之间。通过宽角X射线衍射实验,所有聚合物均显示出非晶态行为。