| Title | Influence of the terminal substituent of azobenzene on the liquid crystalline property of ABA triblock copolymers |
| Authors | Tang, Xinde Gao, Longcheng Han, Nianfeng |
| Affiliation | Institute of New Materials, Shandong Jiaotong University, Jinan, Shandong 250023, China College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China |
| Issue Date | 2010 |
| Citation | 2009 International Symposium on Liquid Crystal Science and Technology.Kunming, China,428-429(122-125). |
| Abstract | The influence of the terminal substituent of azobenzene on the liquid crystalline property of ABA triblock copolymers was studied. Three kinds of azobenzene-containing monomers with different terminal substituents were respectively used to synthesize ABA triblock copolymers (denoted as PMMAzo 12-PEG13-PMMAzo12, PEMAzo14-PEG 13-PEMAzo14, and PNMAzo14-PEG 13-PNMAzo14) by atom transfer radical polymerization (ATRP). These copolymers were characterized with 1H NMR and GPC, and exhibited controlled molecular weights and narrow molecular weight distributions. Differential scanning calorimetry (DSC) and polarizing optical microscopy (POM) have shown that these copolymers have mesophases. PMMAzo12-PEG 13-PMMAzo12 has a smectic mesophase and a nematic mesophase, while both PEMAzo14-PEG13-PEMAzo14 and PNMAzo14-PEG13-PNMAzo14 have a nematic mesophase. This demonstrates that the LC properties of these copolymers highly depend on the terminal substituent of azobenzene. ? (2010) Trans Tech Publications. |
| URI | http://hdl.handle.net/20.500.11897/330225 |
| DOI | 10.4028/www.scientific.net/KEM.428-429.122 |
| Indexed | EI |
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