102471-17-0Relevant academic research and scientific papers
Design and characterization of novel bis-benzamide liquid crystalline materials
Iqbal, Asma,Siddiqi, Humaira Masood,Akhter, Zareen,Qaiser Fatmi, Muhammad
, p. 135 - 141 (2017/09/23)
A new homologous series of symmetric, bent-shaped bis-benzamide dimers have been prepared. Several 1,n-bis(p-aminophenoxy)alkanes (n = 3, 5, 9,10,11) were employed as spacers and p-hexyloxy tails have been synthesized and appended to the spacers by amide linking groups. Different important parameters were explored using computational analysis by semi empirical method. The experimental results were correlated with theoretical studies and relationship between molecular structure and mesogenic behavior has been established. The mesomorphic properties of the resultant dimers were characterized by differential scanning calorimetry (DSC) and polarized optical microscopy (POM) equipped with a hot stage. Change in mesomorphic properties with change of methylene spacers was observed. Enantiotropic mesogenic behavior was exhibited by D3A6, D10A6 and D11A6 and the needle like and blurred schleiren textures were observed. It was observed that increased methylene spacers chain length decreased the melting temperatures. Thermogravimetric analysis revealed the thermal stability of dimers upto 360 °C.
The effect of even-odd methylene spacer groups on the thermal stability of epoxy-amine polymers
Shakil, Maria,Akhter, Toheed,Siddiqi, Humaira Masood,Akhtar, Zareen
, p. 92 - 98 (2015/05/20)
A series of some novel epoxy-amine polymers was successfully synthesized by using DGEBA and aromatic diamines as starting materials. The cured free standing flexible polymer films were characterized by FTIR, DSC, TGA, and WAXD. The values of Tg
