Self-doped N-4-sulfopropylaniline–3, 4-ethylenedioxythiophene copolymers

2016 ◽  
Vol 29 (8) ◽  
pp. 976-983 ◽  
Author(s):  
Isao Yamaguchi ◽  
Masaru Ito
Keyword(s):  
Electrical Conductivity ◽  
Electrochemical Oxidation ◽  
Visible Spectrum ◽  
Ammonium Persulfate ◽  
Feed Ratio ◽  
Molar Ratios ◽  
Monomer Feed ◽  
Monomer Feed Ratio

Polymerization of N-4-sulfopropylaniline with 3,4-ethylenedioxythiophene (EDOT) in several molar ratios using ammonium persulfate yielded copolymers (PPrSO3H) consisting of N-4-sulfopropylaminophenylene (unit A) and 3,4-ethylenedioxythiophene-2,5-diyl (unit B). The corresponding copolymers (PBu) consisting of N-butylaminophenylene (unit C) and unit B were synthesized by the reaction of N-butylaniline and EDOT. The content of units A, B, and C in the copolymers depended on the monomer feed ratio. The ultraviolet–visible spectrum of PPrSO3H exhibited absorption peaks at approximately 420 nm and above 850 nm assignable, respectively, to polaron and bipolaron bands. The copolymers were subjected to electrochemical oxidation, which was dependent on the contents of units A and C. The electrical conductivity of PPrSO3H was found to be higher than that of PBu.

Synthesis, characterisation and properties of aramid copolymers prepared from AB and AB2 monomers

e-Polymers ◽  
2003 ◽  
Vol 3 (1) ◽  
Author(s):  
Orietta Monticelli ◽  
Stefano Fiori ◽  
Alberto Mariani ◽  
Saverio Russo ◽  
Hartmut Komber
Keyword(s):  
Liquid Crystalline ◽  
Reaction Medium ◽  
Aromatic Polyamide ◽  
Degree Of Crystallinity ◽  
Feed Ratio ◽  
Structure Evolution ◽  
Monomer Composition ◽  
Degradation Temperature ◽  
Monomer Feed ◽  
Monomer Feed Ratio

Abstract Aromatic polyamide (aramid) copolymers having a highly branched architecture were prepared by direct polycondensation of an AB2 monomer (5-(4-aminobenzoylamino) isophthalic acid) with an AB monomer (N-(4-aminophenyl)terephthalamic acid). Two synthetic routes have been followed for copolymer preparation, differing from each other in the overall monomer content and the type of salts added to the reaction medium (LiCl or LiCl + CaCl2). Otherwise, both methods used the same conditions and the same condensing agent (triphenyl phosphite). The feed ratio of the monomers affected the copolymer solubility in aprotic polar solvents such as N,N-dimethylformamide, N-methylpyrrolidone and dimethyl sulfoxide. Only high AB2/AB monomer ratios allowed obtaining completely soluble polymers in the above media. Also copolymer intrinsic viscosity was influenced by that ratio as well as by the polymerisation routes. IR measurements gave an indication of polymer structure evolution as a function of the monomer feed ratio, while 1H NMR experiments verified the actual monomer composition in the synthesized polymers. The monomer feed ratio turned out to influence polymer properties, such as degree of crystallinity, thermal degradation temperature and liquid crystalline behaviour. Some of the characterisation techniques we used (1H and 31P NMR, IR, SEM-EDS) revealed the presence of phosphorus derivatives in the copolymers, despite extensive sample purification. This presence is coming from derivatives of the condensing agent, and is directly related to the content of AB2-type structures present in the copolymers.

The growth and chemical structure of thin photonic films formed from plasma copolymerization: I. Effect of monomer feed ratio

Polymer ◽  
2004 ◽  
Vol 45 (25) ◽  
pp. 8475-8483 ◽  
Author(s):  
H. Jiang ◽  
J.T. Grant ◽  
S. Tullis ◽  
K. Eyink ◽  
P. Fleitz ◽  
...  
Keyword(s):  
Chemical Structure ◽  
Feed Ratio ◽  
Monomer Feed ◽  
Plasma Copolymerization ◽  
Monomer Feed Ratio

scholarly journals Fabrication of Polypyrrole Nanoparticles Using Microemulsion Polymerization for Diferent Py/APS/SDS Molar Ratios

2016 ◽  
Vol 869 ◽  
pp. 391-395 ◽  
Author(s):  
Ricardo Hidalgo Santim ◽  
Hermes Adolfo de Aquino ◽  
José Antonio Malmonge
Keyword(s):  
Electrical Conductivity ◽  
Near Infrared ◽  
Sodium Dodecylsulfate ◽  
Ammonium Persulfate ◽  
Synthesis Temperature ◽  
Molar Ratio ◽  
Synthesis Conditions ◽  
Molar Ratios ◽  
Nanoparticle Shape ◽  
Polypyrrole Nanoparticles

Polypyrrole nanoparticles (PPy) were synthesized by the chemical oxidative microemulsion of pyrrole (Py) monomer using ammonium persulfate (APS) as an oxidant agent and sodium dodecylsulfate (SDS) as a surfactant at 28°C and 0°C. Different Py:APS:SDS molar ratios were used, and the properties of the resulting material were examined by four-probe DC electrical conductivity, ultraviolet-visible-near infrared (UV-vis-Nir), and Fourier-transform infrared (FTIR) spectroscopies as well as field-emission scanning electron microscopy (FESEM). UV-vis-Nir and FTIR spectra show the formation of a polaron band owing to the doping of PPy by SDS. The electrical conductivity and morphology of PPy nanoparticles depend on the synthesis conditions. Electrical conductivity of ~95.3×10-3 S/cm was achieved for PPy synthesized at 0°C. For the same Py:APS:SDS molar ratio, the nanoparticle shape changed from cylindrical to spherical upon simply lowering the synthesis temperature.

scholarly journals The First Synthesis of Periodic and Alternating Glycopolymers by RAFT Polymerization: A Novel Synthetic Pathway for Glycosaminoglycan Mimics

Polymers ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 70 ◽  
Author(s):  
Masahiko Minoda ◽  
Tomomi Otsubo ◽  
Yohei Yamamoto ◽  
Jianxin Zhao ◽  
Yoshitomo Honda ◽  
...  
Keyword(s):  
Chain Transfer ◽  
Binding Assay ◽  
Raft Polymerization ◽  
Lectin Binding ◽  
Feed Ratio ◽  
Controlled Synthesis ◽  
Reversible Addition ◽  
Monomer Feed ◽  
Polymerization Condition ◽  
Monomer Feed Ratio

This study concerned the controlled synthesis of periodic glycopolymers by reversible addition-fragmentation chain transfer (RAFT) copolymerization. To this end, maltose- and lactose-substituted vinyl ethers (MalVE and LacVE, respectively) and maltose-substituted maleimide (MalMI) were newly synthesized. RAFT copolymerization of MalVE and ethyl maleimide (EtMI) (monomer feed ratio: MalVE:EtMI = 1:1) afforded periodic glycopolymers (poly(MalVE-co-EtMI)) consisting of major parts of alternating structure (-(MalVE-EtMI)n-) and a small part of consecutive sequences of EtMI (–EtMI-EtMI-). Occurrence of the latter sequences was caused by the homopolymerizability of maleimide under the present polymerization condition, and the formation of the consecutive sequences of EtMI was successfully suppressed by varying the monomer feed ratio. RAFT copolymerization of LacVE and EtMI was also found to proceed and similarly yielded periodic glycopolymers (poly(LacVE-co-EtMI)). Moreover, RAFT copolymerization of LacVE and MalMI (monomer feed ratio: LacVE:MalMI = 1:1) was performed to give copolymers (poly(LacVE-co-MalMI)) having composition ratio of LacVE/MalMI ≈ 36/64. The resultant periodic glycopolymers poly(MalVE-co-EtMI) and poly(LacVE-co-EtMI) were subjected to lectin binding assay using concanavalin A and peanut agglutinin, exhibiting the glycocluster effect. Moreover, these glycopolymers obtained from the copolymerization of VE and MI were found to be non-cytotoxic.

Avoiding compositional drift during the RAFT copolymerization of N-(2-hydroxypropyl)methacrylamide and N-acryloxysuccinimide: towards uniform platforms for post-polymerization modification

2015 ◽  
Vol 6 (17) ◽  
pp. 3245-3251 ◽  
Author(s):  
John Moraes ◽  
Ioana-Maria Simionca ◽  
Hedi Ketari ◽  
Harm-Anton Klok
Keyword(s):  
Feed Ratio ◽  
Hydroxypropyl Methacrylamide ◽  
Monomer Feed ◽  
Monomer Feed Ratio

Compositionally uniform copolymers: avoiding compositional drift during RAFT copolymerization by controlling monomer feed ratio and conversion.

Electron Transporting Perylene Diimide-Based Random Terpolymers with Variable Co-Monomer Feed Ratio: A Route to All-Polymer-Based Photodiodes

2022 ◽  
Author(s):  
Stefania Aivali ◽  
Peisen Yuan ◽  
Julianna Panidi ◽  
Dimitra G. Georgiadou ◽  
Themis Prodromakis ◽  
...  
Keyword(s):  
Perylene Diimide ◽  
Feed Ratio ◽  
Monomer Feed ◽  
Monomer Feed Ratio
Sign in / Sign up

Export Citation Format

Share Document