Hydrogen bonding-induced assembled structures and photoresponsive behavior of azobenzene molecule/polyethylene glycol complexes

Hsin Tzu Tai, Yen Chun Lin, Jing Yao Ma, Chieh Tsung Lo

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

We investigated the self-assembled structures and photoresponsive and crystallization behaviors of supramolecules composed of 4-methoxy-40-hydroxyazobenzene (Azo)molecules and polyethylene glycol (PEG) thatwere formed through hydrogen-bonding interactions. TheAzo/PEGcomplexes exhibited the characteristics of photoresponse and crystallization, which originated fromAzo and PEG, respectively. When Azo/PEG complexes were dissolved in solvents, hydrogen-bonding interaction hindered the rotation and inversion of mesogens, causing a reduction in the photoisomerization rate compared with the photoisomerization rate of the neat Azo. The confinement of Azo/PEG complexes in thin films further resulted in a substantial decrease in the photoisomerization rate but an increase in the amounts of H-aggregated and J-aggregated mesogens. Regarding PEG crystallization, ultraviolet irradiation of Azo/PEG complexes increased the quantity of high-polarity cis isomers, which improved the compatibility between mesogens and PEG, subsequently increasing the crystallization temperature of PEG. Moreover, the complexation of Azo and PEG induced microphase separation, forming a lamellar morphology. Within the Azo-rich microphases, mesogens aggregated to form tilted monosmectic layers. By contrast, PEG crystallization within the PEG-rich microphases was hard confined, indicating that the domain size of the lamellar morphology was unchanged during PEG crystallization.

Original languageEnglish
Article number1360
JournalPolymers
Volume11
Issue number8
DOIs
Publication statusPublished - 2019 Aug 1

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Polymers and Plastics

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