Combination of donor characters in donor-acceptor-donor type polymers containing benzothiadiazole and quinoxaline as the acceptor units

Download

index.pdf

Date

2011

Author

Şendur, Merve

Metadata

Show full item record

Item Usage Stats

143
views

51
downloads

Donor-acceptor-donor approach is one of the effective ways to synthesize low band gap polymers. The monomers that will be designed with respect to donor-acceptor-donor approach have low band gap achieved by the coupling of a strong donor with high HOMO level to a strong acceptor with low LUMO level. Thus, the new donor-acceptor material will have a reduced bandgap (Eg) relative to either of its parent components. Due to this point of view, in this study, new electroactive benzothiadiazole and 2,3-bis(4-(tert-butyl)phenyl)quinoxaline monomers substituted with different donor groups (3,4-ethylenedioxythiophene and thiophene) were synthesized to explain the effect of different donor groups on the electronic and optical properties of DAD type polymers. The characterizations of the monomers were performed by 1H and 13C NMR techniques. Electrochemical behavior of both monomers and polymers were studied by cyclic voltammetry. The electrochromic properties of the synthesized conducting polymers were investigated by several methods like spectroelectrochemistry, kinetic and colorimetry studies. The polymers have two different donor units may behave as a copolymer of the symmetric monomer having the same donor groups. Hence, the properties of copolymers were investigated with the co-monomers having either thiophene or 3,4-ethylenedioxythiophene as the donor group.

Subject Keywords

Polymers, Monomers.

URI

http://etd.lib.metu.edu.tr/upload/12613990/index.pdf
https://hdl.handle.net/11511/20991

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Synthesis and characterization of a polybenzoxazine from a difunctional amine and a trifunctional phenol Kaya, Şafak; Tinçer, Teoman; Department of Polymer Science and Technology (2009) Synthesis of a polymer with benzoxazine units in the main chain backbone by a trifunctional phenol, a difunctional amine, and paraformaldehyde was achieved. Thermal, mechanical and spectroscopic characterization and the viscosity properties of the synthesized polymer were studied. In the first step of this study, a fast and feasible method for the synthesis of the benzoxazine precursors was developed since some methods mentioned in the literature about the synthesis of the benzoxazine derivatives last long ...
Synthesis of conducting block copolymers and their use in the immobilization of invertase and polyphenol oxidase enzyme Kıralp, Senem; Kıralp, Senem; Department of Chemistry (2004) A new thiophene derivative containing menthyl group (MM) was synthesized and polymerized via chemical and electrochemical methods. Polymers obtained and MM itself were used to synthesize copolymers with pyrrole under conditions of constant potential electrolysis. Cyclic Voltammetry, thermal analysis and scanning electron microscopy analyses were performed for the characterization of samples. Immobilization of invertase and polyphenol oxidase enzymes was performed in the matrices obtained via copolymerizatio...
Micromechanical modeling of semicrystalline polymers with spherulite morphology Oktay, Hasan Emre; Göktepe, Serdar; Gürses, Ercan; Department of Civil Engineering (2020-10-23) In this study, a micromechanical constitutive model for semicrystalline polymers is developed. The proposed model considers interactions among the adjacent regions at the same length scale. The neighborhood information is obtained from the well characterized spherulite morphology of polyethylene. Deformation characteristics of a disk-like spherulite model that has similarities with the considered modeling approach are studied using the finite element method. The model discretizes a disklike spherulite i...
Design and synthesis of novel donor-acceptor type monomers and ınvestigation of optoelectronic properties of their polymers Ünver, Elif Köse; Tanyeli, Cihangir; Department of Chemistry (2010) A proven strategy, donor-acceptor approach, to reduce the band gap of conjugated materials and possibly improve the photocurrent is to incorporate electron-rich and electron-deficient units in an alternating fashion in a polymer chain. For this purpose, a wise selection of donor and acceptor moieties in a monomer structure results in desired finishing properties of polymeric materials. In this study, fourteen novel monomers were synthesized to explore the acceptor and donor effects on the electronic and opt...
Polymerization and characterization of methylmethacrylate by atom transfer radical polymerization Aran, Bengi; Usanmaz, Ali; Department of Polymer Science and Technology (2004) In this work, methylmethacrylate, MMA was polymerized by ATRP method to obtain low molecular weight living polymers. The initiator was p-toluenesulfonylchloride and catalyst ligand complex system were CuCl-4,4̕ dimethyl 2,2̕bipyridine. Polymers with controlled molecular weight were obtained. The polymer chains were shown by NMR investigation to be mostly syndiotactic. The molecular weight and molecular weight distribution of some polymer samples were measured by GPC method. The K and a constants in [h]=K Ma...

Citation Formats

M. Şendur, “Combination of donor characters in donor-acceptor-donor type polymers containing benzothiadiazole and quinoxaline as the acceptor units,” M.S. - Master of Science, Middle East Technical University, 2011.