2,6-二偶氮-[4,4′-(双间苯二胺)]苯骈[1,2-d:4,5-d′]二噻唑的合成及其特性的研究

合成了新双噻唑偶氮试剂２,６－二偶氮－［４,４′－（双间苯二胺）］苯骈［１,２－ｄ：４,５－ｄ′］二噻唑（ＢＤＴＡＤＡＢ）。运用元素分析、红外光谱法对其结构进行了鉴定,并对其物理特性、化学特性、紫外吸收光谱、酸离解常数等进行了研究。     

含V型刚直性结构PBT在稀溶液中的结晶现象

将刚棒状ＰＢＴ（聚苯撑苯并二噻唑）与含Ｖ型结构ＰＢＴ溶解于稀溶液中,使其在急冷,等温状态下结晶。对生成的结晶体运用透过型电子显微镜等测试手段进行了结构分析比较,结果表明Ｖ型结构ＰＢＴ在稀溶液中结晶时,其分枝结晶部分被排除在主晶体外,形成分枝状结晶。     

Synthesis and properties of novel benzobisthiazole‐containing hyperbranched polyamides derived from 2,6‐diaminobenzo[1,2‐d:4,5‐d']bisthiazole

In this article, two novel benzobisthiazole‐containing hyperbranched polyamides with different end groups were synthesized, by adjusting the feed molar ratio of the reaction monomers, using 1,3,5‐benzenetricarboxylic acid and 2,6‐diaminobenzo[1,2‐d:4,5‐d']bisthiazole as monomers, polyphosphoric acid as solvent, and catalyst. The molecular structure of the synthesized hyperbranched polymers were speculated by ¹H‐nuclear magnetic resonance (NMR) analysis, ¹³C‐NMR analysis, and Fourier transform infrared analysis. The M_n, M_w, and DB of the carboxyl terminated polymer HB‐COOH are 3264 g/mol, 3350 g/mol, and 44.1%, respectively, with a polydispersity of 1.03. The M_n, M_w, and DB of amino terminated polymer HB‐NH₂ are 3340 g/mol, 3420 g/mol, and 41.7%, respectively, with a polydispersity of 1.02. The thermal stability of HB‐NH₂ was higher than HB‐COOH in the range of 30 °C–800 °C.These two benzobisthiazole‐containing hyperbranched polyamides were completely amorphous and soluble in DMSO. Their DMSO solutions exhibited strong blue fluorescence. The fluorescent intensity of HB‐NH₂ was higher than HB‐COOH. The prepared polymers were potential useful in the area of blue light emitting and display. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 43453.