Synthesis of Functional Photoactive Polysilane Copolymers with Disperse Yellow 7 Methacrylate and Study of their Optical, Photophysical and Thermal Properties

By : Km. Meenu, Dibyendu S. Bag, Rekha Lagarkha

Page No: 275-292

Abstract
Functional photoactive polysilane copolymers of poly(methylphenylsilane) (PMPS) and disperse yellow 7 methacrylate (DY7MA) were synthesized using UV-technique. In the same manner functional polysilane copolymers of poly(methylphenylsilane-co-dimethylsilane) (CPS) and disperse yellow 7 methacrylate (DY7MA) were also synthesized. By the UV irradiation polysilanes (PMPS and CPS) give rise to silyl macroradicals which initiate the polymerization of photoactive monomer (DY7MA). The synthesized samples were characterized by FTIR, NMR, and UV-Vis spectroscopy. The molar mass of synthesized photoactive functional polysilane copolymers is of order of 103 gm/mol. They exhibited multimodal optical and photoluminescence functional properties. Optical absorbance was observed at 336 nm due to σ-σ* transition of σ-conjugation of Si-Si main chain.The other absorbance at 276 nm is due to π-π* transition of aromatic ring associated with polysilanes and DY7MA polymeric unit.The electronic absorption was observed at 367 nm for π-π* and n-π* transition of azobenzene chromophores of DY7MA. The photoemission spectra are observed at λem = 405, 428 and 454 nm for the excitation energy of 332 and 370 nm. Such functional polysilane copolymers exhibited two glass transition temperatures indicating the formation of block copolymers. The synthesized functional polysilane copolymers are thermally stable upto 300º C. Such functional photoactive block copolymers may find novel optoelectronic applications.

Authors :
KM. Meenu, Dibyendu S. Bag : Defence Materials and Stores Research and Development Establishment DMSRDE, P. O., Kanpur-208013, INDIA
Rekha Lagarkha : Department of Chemistry, Bundelkhand University, Jhansi, INDIA
 

DOI: https://doi.org/10.32381/JPM.2019.36.03.7