Poly(p-iodophenylacetylene): synthesis, characterization, polymer stability and photoelectrical properties

Vohlı́dal, Jiřı́; Sedláček, Jan; Pacovská, Marta; Lavastre, Olivier; Dixneuf, Pierre H.; Balcar, Hynek; Pfleger, Jiřı́

doi:10.1016/s0032-3861(96)00891-9

Cited by 30 publications

(19 citation statements)

References 32 publications

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“…Measurements were done on several samples of thicknesses ranging from 0.5 to 2.0 lm to verify the emission-limited conditions. As can be seen, all studied PDVs show strong dependence of g on F and shapes of the dependences resemble that observed for other conjugated polymers [16,18,20,21,43,44] and for molecular crystals [45,46]. The charge carrier Positively charged surface, electric field F = 4 · 10 7 V m À1 , thickness of films varied between 1 and 2 lm, room temperature.…”

Section: Electrical and Photoelectrical Propertiessupporting

confidence: 64%

“…The effect of substituents on the functional properties of monosubstituted acetylene polymers has been mainly studied on poly(phenylacetylene) [4,5,16] and its ring-substituted derivatives [17][18][19] including those carrying phenyleneethynylene pendent chains [20], and on polymers of propynyl derivatives of heteroaromatic compounds, such as on poly[(N-2-propynyl)carbazole] and poly[(N-2-propynyl)phenothiazine] [21,22]. As to polydiphenylacetylenes (i.e., poly(diphenylvinylene)s, PDV), only a few ring-substituted PDVs have been studied [23][24][25][26] because the parent polymer, unsubstituted PDV, is infusible and insoluble in any solvent [14,15,27].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Electronic processes in end-functionalized oligomeric poly(diphenylvinylene)s

Pfleger

Pavlík

Vohlı́dal

2005

Reactive and Functional Polymers

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Section: Electrical and Photoelectrical Propertiessupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Electronic processes in end-functionalized oligomeric poly(diphenylvinylene)s

Pfleger

Pavlík

Vohlı́dal

2005

Reactive and Functional Polymers

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“…Divers degradation behavior is ob served for three positional isomers (2-, 3-and 4-) of PIP A prepared with WOCU-based catalyst (high-trans polymers). Oxidative degradation of 4-PIPA/W has been studied recently and found to suit the laws of polymer random degradation (41). The deter mined value of the rate constant ν = 2.6· 10" 6 min" 1 is close to that found for PPA/W.…”

Section: Nosupporting

confidence: 57%

Degradation of Substituted Polyacetylenes and Effect of This Process on SEC Analysis of These Polymers

Vohlı́dal

Sedláček

1999

ACS Symposium Series

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Survey of advances in the fields of: (i) spontaneous autoxidative degradation of substituted polyacetylenes, and (ii) effect of this process on SEC analyses of these polymers, involving already published and new original results is presented. The degradation is shown to be, essentially, of the random type but accompanied by the enhanced low-MW species elimination in case of high-cis polymers. These species are suggested to be formed in the reactive relaxation of excited ends of primary fragments resulting from the random oxidative cleavage of macromolecules. The degradation proceeds even in SEC columns and distorts results of the polymer SEC analysis. Theoretical treatment and computer simulation of such analyses provided information on the results' distortion extent and showed that systematically biased MW averages provide plausible degradation rate constants.Size partitioning of macromolecules in SEC columns is more or less perturbed by various hydrodynamic and thermodynamic effects that do not alter a constitution of analyzed macromolecules (1-3). Only in case of very long macromolecules, typically with MW above 5-10 6 , the degradation induced by hydrodynamic shear forces can occur in SEC columns (4,5). This process has been reported for various high-MW polymers like poly(styrene), polyethylene, poly(methyl methacrylate), poly(isoprene), poly(oxyethylene) and poly(isobutylene) (4-15) so that it is well established and known,.nowadays. On the other hand, little is yet known on the effect of chemically induced degradation in the polymer SEC analysis that was recently demonstrated in the case of poly(phenylacetylene) (16) which undergoes rather fast oxidative degradation in soluSupported by the Ministry of Education of the Czech Republic, Project VS 97103.

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“…degradation) of lower-MW poly(-phenylacetylene) (PPhA) when it was exposed to the atmosphere in the solid state [55]. The degradation of several high-MW cis/trans poly(arylacetylene)s exposed to the atmosphere in the solid state and in the solution has been studied in our group [57e59, 61,65]. The Size Exclusion Chromatography (SEC) was applied as a fundamental technique and was demonstrated as a powerful tool for the study of this phenomenon [61,68e72].…”

Section: Introductionmentioning

confidence: 99%