Twin liquid crystals and segmented thermotropic polyesters containing azobenzene-effect of spacer length on LC properties was written by Nardele, Chinmay G.;Asha, S. K.. And the article was included in Journal of Polymer Science, Part A: Polymer Chemistry in 2012.Recommanded Product: Dimethyl decanedioate This article mentions the following:
Systematic studies are reported for a homologous series of twin liquid crystalline (LC) mols. based on phenylazobenzene and naphthylazobenzene (PnP and NpnNp, n = number of spacer groups) as well as segmented copolyesters based on them. The twin series had the structure azobenzene-oligooxyethylene-azobenzene, where the ethyleneoxy length was varied from 2 to 6 units. The LC properties of the twin series depended on the chem. structure of the azo chromophore and also the length of the central oligooxyethylene segment. The PnP series exhibited smectic LC properties for n greater than three oligooxyethylene units. Conversely, NpnNp series exhibited spherulitic phases only for the shortest member Np2Np. One non-LC short spacer twin (P2P) and one LC long spacer twin (P6P) were incorporated as part of a main chain polyester composed of fully aliphatic segments of sebacate and di- or tetraethylene glycol (DEG/TEG) units by melt polycondensation. Non-LC P2P formed LC polymers even at low (5 mol%) incorporation in DEG-based copolymers, whereas the LC-P6P could do so only at 30 mol% incorporation. The LC properties of the twin mols. as well as copolymers were studied using differential scanning calorimetry, polarized light microscopy (PLM) along with variable temperature wide angle X-ray diffraction. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012. In the experiment, the researchers used many compounds, for example, Dimethyl decanedioate (cas: 106-79-6Recommanded Product: Dimethyl decanedioate).
Dimethyl decanedioate (cas: 106-79-6) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Polyesters are important plastics, with monomers linked by ester moieties. Esters are more polar than ethers but less polar than alcohols. They participate in hydrogen bonds as hydrogen-bond acceptors, but cannot act as hydrogen-bond donors, unlike their parent alcohols. This ability to participate in hydrogen bonding confers some water-solubility.Recommanded Product: Dimethyl decanedioate
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics