232269-63-5Relevant academic research and scientific papers
Influence of alkoxy tail length on the phase behaviour of mesogen-jacketed liquid crystalline polymers with fan-shaped pendants
Yang, Chang-An,Wang, Guo,Xie, He Lou,Zhang, Hai Liang
, p. 4503 - 4510 (2011/11/06)
A series of new monomers of 2, 5-bis [(3, 4, 5-trialkoxy benzyl) oxycarbonyl] styrene (denoted as M-tri-OCmH2m + 1, m = 1, 2, 4, 6, 8, 10, 12, where m indicated the number of carbon atoms in the alkoxy group) were designed and synthesized. Then, their corresponding polymers P-tri-OCmH2m + 1 (m = 1, 2, 4, 6, 8, 10, 12) were synthesized by free radical polymerization. The chemical structure of the monomers was confirmed by elemental analysis, 1H NMR and 13C NMR. The molecular characterization of polymers was performed with 1H NMR, gel permeation chromatography (GPC). The thermal stability of polymers was investigated by thermogravimetric analysis (TGA). The phase structure and transition behaviours were studied using differential scanning calorimetry (DSC), polarized light microscopy (PLM), one- and two-dimensional (1D and 2D) wide-angle X-ray diffraction (WAXD). We found that P-tri-OCmH2m + 1 (m = 1, 2) with short n-alkoxy substituents as the tail form columnar nematic (ΦN) phase; that with the increasing length of alkoxy tails, P-tri-OCmH2m + 1 (m = 4, 6, 8) can demonstrate the hexagonal columnar (ΦH) phase; however, when the length of alkoxy tails exceeded a threshold, P-tri-OCmH2m + 1 (m = 10, 12) only develop into columnar nematic (ΦN) phase instead of ΦH phase.
Elucidating the structure of the pm3n cubic phase of supramolecular dendrimers through the modification of their aliphatic to aromatic volume ratio
Percec, Virgil,Peterca, Mihai,Tsuda, Yusuke,Rosen, Brad M.,Uchida, Satoshi,Imam, Mohammad R.,Ungar, Goran,Heiney, Paul A.
supporting information; experimental part, p. 8994 - 9004 (2010/04/25)
The synthesis, and structural and retrostructural analysis of a library of second-generation conical dendrons that self-assemble into spherical supramolecular dendrimers is reported. This library consists of amphiphilic dendrons with n-alkyl groups contai
