Mark-Houwink-Sakurada Constants for the Methoxy Precursor of Poly(2,5-thienylenevinylene)

Wit, M. De; Verreyt, G.; Bao, Youmei; Geise, H. J.

doi:10.1021/ma00118a050

Cited by 6 publications

(3 citation statements)

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“…The results shown in Table can only be used for relative comparison, the true molecular weight of the rigid polymer is probably lower. Earlier GPC experiments on PTV precursors had proved that the molecular weight is overestimated by a factor of 3 unless a calibration is used based on the precursor itself . Nevertheless, the data clearly show that a 3-fold increase of the average molecular weight is possible by doubling the reaction time.…”

Section: Synthetic Aspectsmentioning

confidence: 83%

“…Earlier GPC experiments on PTV precursors had proved that the molecular weight is overestimated by a factor of 3 unless a calibration is used based on the precursor itself. 9 Nevertheless, the data clearly show that a 3-fold increase of the average molecular weight is possible by doubling the reaction time. It is of interest to note that the molecular weight decreases over long reaction periods (see cyclohexanol); this may be caused by degradation of the polymer chain.…”

Section: Synthetic Aspectsmentioning

confidence: 94%

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Synthesis, Characterization, and Stability of High Molecular Weight Poly(thiophene-2,5-diyl-1,2-dimethoxyvinylene)

et al. 1996

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The new polymer poly(thiophene-2,5-diyl-1,2-dimethoxyvinylene) was synthesized by a benzoin condensation of thiophene-2,5-dicarboxaldehyde to poly(2,5-thienylene-1-oxo-2-hydroxyethylene) (M w ∼ 1 × 106, pd ∼ 13), followed by O-alkylation using dimethyl sulfate. A side reaction of the benzoin condensation step leading to dimethyl-2,5-thiophenedicarboxylate can be avoided by using cyclohexanol as the solvent. The O-alkylation, including the workup, has to be performed under nitrogen protection to counteract the degradation of the polymer by air under the influence of light. A mechanism is proposed for the oxidative degradation of this poly(thiophene-2,5-diylvinylene) derivative and other poly(arylenevinylenes). Conductivity and thermal properties of the new polymer are given.

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Section: Synthetic Aspectsmentioning

confidence: 83%

Section: Synthetic Aspectsmentioning

confidence: 94%

Synthesis, Characterization, and Stability of High Molecular Weight Poly(thiophene-2,5-diyl-1,2-dimethoxyvinylene)

et al. 1996

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“…Healthy plant growth and, more specifically, healthy crop growth requires fertilized and stable top soil [1][2][3][4][5]. Although soil is a renewable resource, it can take hundreds of years to build up just a half-inch of topsoil [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Polymers for Soil Stabilization and Soil Nutrient Retention

Chen¹

2016

Int J Appl Sci Res Rev

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Kimberly-Clark. It is a commercial product used in personal care products, specifically for diaper applications. Chemically speaking, superabsorbent is a cross-linked polyacrylate. The degree of cross-linking was evaluated with a home-made expansion test similar to the Absorbency under Load as published in numerous patent literatures (The detailed procedures are attached in the supplement material) with an expansion of 12.3 mm versus 0-0.5 mm for other polymers [22][23][24][25]. There are two polyacrylamides in this work. One is designated as C3221 from Ciba-Geigy. It is a high molecular weight polyacrylamide 1 . The intrinsic viscosity for C3221 in distilled water is 11.19 dL/g. The other is designated as P21450 (CAS # 903-05-08) from Pfaltz & Bauer. The intrinsic viscosity for P21450 is 4.76 dL/g. Sodium polyacrylate with a molecular weight of 15,000, 8000 and 5100 were purchased from the Sigma-Aldrich Company. The intrinsic viscosity for this sodium polyacrylate of molecular weight 15,000 is 1.76 dL/g. Chitosan was also purchased from the Sigma-Aldrich Company.1 Molecular weights are inferred from the intrinsic viscosity value which is related to the molecular weight through the Mark-Houwink equation. Experimental Methods and Materials PolymersEncap ® AST was provided by the Encap Company. It is a carboxylate ion modified polyacrylamide. The intrinsic viscosity for Encap ® AST is 66.68 dL/g.

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Fractionation of Polymers

Barrales‐Rienda

Bello

et al. 1999

The Wiley Database of Polymer Properties

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Mark-Houwink-Sakurada Constants for the Methoxy Precursor of Poly(2,5-thienylenevinylene)

Cited by 6 publications

References 7 publications

Synthesis, Characterization, and Stability of High Molecular Weight Poly(thiophene-2,5-diyl-1,2-dimethoxyvinylene)

Synthesis, Characterization, and Stability of High Molecular Weight Poly(thiophene-2,5-diyl-1,2-dimethoxyvinylene)

The Effect of Polymers for Soil Stabilization and Soil Nutrient Retention

Fractionation of Polymers

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