Synthesis and characterization of poly (l-lactic acid) containing the azobenzene mesogens

Run Tao Dong, Qing Bin Xue, Ling Min Sun, Quan Xuan Zhang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

A series of azobenzene containing group Poly (L-lactic acid) (PLLA) were synthesized by Ring-Opening Polymerization of L-lactide (L-LA) catalysted by Sn(Oct) 2 initiated by alcohol-OH containing the azobenzene chromophores. Their molecular weights were well controlled by the feed ratio as characterized by Gel Permeation Chromatography (GPC) and 1H NMR Spectrometry and agreed well with theoretical values. The thermal properties and liquid crystal phases were investigated by Differential Scanning Calorimetry (DSC), polarized optical microscopy (POM) and X-ray Diffraction (XRS) measurements. Cis-trans photoisomerization behavior of the polymers in the solutions and the films were studied with UV irradiation. By the Circular Dichroism Spectroscopy (CD) characterization of the solutions and films of the polymer, the PLLA segments show huge optical rotation power in helical structure.

Original languageEnglish (US)
Title of host publicationLiquid Crystals and Related Materials II
PublisherTrans Tech Publications Ltd
Pages185-188
Number of pages4
ISBN (Print)9783037852934
DOIs
StatePublished - Jan 1 2012
Event2nd International Symposium on Liquid Crystals: Science and Technology, LCST2011 - Changzhou, China
Duration: Jul 17 2011Jul 19 2011

Publication series

NameSolid State Phenomena
Volume181-182
ISSN (Print)1012-0394

Other

Other2nd International Symposium on Liquid Crystals: Science and Technology, LCST2011
CountryChina
CityChangzhou
Period7/17/117/19/11

Keywords

  • Azobenzene
  • Poly (L-lactic acid)
  • Thermal properties

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    Dong, R. T., Xue, Q. B., Sun, L. M., & Zhang, Q. X. (2012). Synthesis and characterization of poly (l-lactic acid) containing the azobenzene mesogens. In Liquid Crystals and Related Materials II (pp. 185-188). (Solid State Phenomena; Vol. 181-182). Trans Tech Publications Ltd. https://doi.org/10.4028/www.scientific.net/SSP.181-182.185