Synthesis and characterization of polyesters derived from aromatic 1,4‐dimethoxylated diacids

Díaz, F. R.; Tagle, L. H.; Olivares, J. P.

doi:10.1002/pol.1983.170210813

Cited by 14 publications

(1 citation statement)

References 10 publications

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“…Typical Procedure for the Preparation of 2,5-Dimethoxyterephthaloyl Chloride (2b). A mixture of 2a (0.7 g, 2 mmol), thionyl chloride (11.8 g, 100 mmol), and DMF (1 drop) under nitrogen was stirred for 24 h at room temperature followed by heating at reflux for 4 h. Excess thionyl chloride was removed by distillation and the residual solid washed with hexane to give 2b , which was used directly in the next step: yield 0.5g (75%); mp 102−104 °C (lit . mp 97−100 °C).…”

Section: Methodsmentioning

confidence: 99%

Poly[bis(pyrrol-2-yl)arylenes]: Conducting Polymers from Low Oxidation Potential Monomers Based on Pyrrole via Electropolymerization

et al. 1996

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A series of derivatized bis(pyrrol-2-yl) arylenes, specifically 1,4-bis(pyrrol-2-yl)benzene (1e, BPB), 1,4-bis(pyrrol-2-yl)-2,5-dimethoxybenzene (2e, BPB(OCH3)2), 1,4-bis(pyrrol-2-yl)-2,5-diethoxybenzene (3e, BPB(OC2H5)2), 1,4-bis(pyrrol-2-yl)-2,5-didodecyloxybenzene (4e, BPB(OC12H25)2), 2,6-bis(pyrrol-2-yl)naphthalene (5e, BPN), and 4,4‘-bis(pyrrol-2-yl)biphenyl (6e, BPBP) have been synthesized. Cyclic voltammetry shows these monomers to oxidize at relatively low potentials to form cation radicals. The lowest peak monomer oxidation potential of +0.15 V vs Ag/Ag+ is observed for 2e, lower than that reported for any other pyrrole-based monomer. Electrochemical polymerization from a 0.01 M monomer, 0.1 M tetrabutylammonium perchlorate (TBAP), and acetonitrile solution was carried out using multiple scanning cyclic voltammetry to yield polymers having E 1/2 values ranging from −0.1 to +0.1 V. These low oxidation potentials cause the polymers to be quite stable in the electrically conducting form. The electronic band gaps for these polymers (measured as the onset of the π−π* transition) occurs between 2.3 and 2.4 eV. Upon electrochemical doping, the intensity of the π−π* transition decreases while bipolaron bands appear at lower energy. The intensity of these bands increases upon increasing the anodic potential. The redox doping process was found to be reversible upon electrochemical reduction of the films. The unsubstituted polymer poly[1,4-bis(pyrrol-2-yl)benzene], doped with perchlorate, was found to exhibit an average conductivity of 1 S/cm. When the dopant was the anion of bis[(trifluoromethyl)sulfonyl]imide, the conductivity increased to 30 S/cm. These polymers are stable to thousands of double-potential steps before 50% loss of electroactivity occurs.

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Section: Methodsmentioning

confidence: 99%

Poly[bis(pyrrol-2-yl)arylenes]: Conducting Polymers from Low Oxidation Potential Monomers Based on Pyrrole via Electropolymerization

et al. 1996

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Characterization of the isothermal crystallization of poly(ethylene terephthalate) by microhardness measurements

Pastor

González

Saja

1989

J of Applied Polymer Sci

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Superstructure and mechanical properties of nylon 66 microfiber prepared by carbon dioxide laser‐thinning method

Suzuki

Hasegawa

2005

J of Applied Polymer Sci

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Nylon 66 microfibers were obtained by a carbon dioxide (CO 2 ) laser-thinning method. A laser-thinning apparatus used to continuously prepare microfibers consisted of spools supplying and winding the fibers, a continuous-wave CO 2 -laser emitter, a system supplying the fibers, and a traverse. The diameter of the microfibers decreased as the winding speed increased, and the birefringence increased as the winding speed increased. When microfibers, obtained through the laser irradiation (at a power density of 8.0 W cm Ϫ2 ) of the original fiber supplied at 0.23 m min Ϫ1, were wound at 2000 m min Ϫ1 , they had a diameter of 2.8 m and a birefringence of 46 ϫ 10 Ϫ3 . The draw ratio calculated from the supplying and winding speeds was 8696ϫ. Scanning electron microscopy showed that the microfibers obtained with the laser-thinning apparatus had smooth surfaces not roughened by laser ablation that were uniform in diameter. To study the conformational transition with winding speed, the changes in trans band at 936 cm Ϫ1 and gauche band at 1136 cm Ϫ1 were measured with a Fourier transform infrared microscope. The trans band increased as the winding speed increased, and the gauche band decreased. Young's modulus and tensile strength increased with increasing winding speed. The microfiber, which was obtained at a winding speed of 2000 m min Ϫ1 , had a Young's modulus of 2.5 GPa and tensile strength of 0.6 GPa.

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Synthesis and characterization of polyesters derived from aromatic 1,4‐dimethoxylated diacids

Cited by 14 publications

References 10 publications

Poly[bis(pyrrol-2-yl)arylenes]: Conducting Polymers from Low Oxidation Potential Monomers Based on Pyrrole via Electropolymerization

Poly[bis(pyrrol-2-yl)arylenes]: Conducting Polymers from Low Oxidation Potential Monomers Based on Pyrrole via Electropolymerization

Characterization of the isothermal crystallization of poly(ethylene terephthalate) by microhardness measurements

Superstructure and mechanical properties of nylon 66 microfiber prepared by carbon dioxide laser‐thinning method

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