Characterization of a stiff-chain polyimide in solution

Schmitz, Ludwig; Ballauff, M.

doi:10.1016/0032-3861(95)93121-2

Cited by 18 publications

(27 citation statements)

References 11 publications

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“…Moreover, a value of [h] ≈ 300 mL g 21 is not only the highest intrinsic viscosity ever observed for a ruthenium(ii) coordination polymer but also of the same order of magnitude as the intrinsic viscosities observed for purely covalent rod-like macromolecules such as poly(p-phenylenes) 16,17 or polyimides. 18 These results thus strongly support the high values of P n and the rod-like shape of 2.…”

supporting

confidence: 72%

Rod-like ruthenium(II) coordination polymers: synthesis and properties in solution

Kelch¹,

Rehahn²

1999

Chem. Commun.

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supporting

confidence: 72%

Rod-like ruthenium(II) coordination polymers: synthesis and properties in solution

Kelch¹,

Rehahn²

1999

Chem. Commun.

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“…5 Another point of interest is the conformation of such a ladder-like macromolecule in solution. A number of studies [6][7][8][9][10] conducted on single-stranded stiff-chain polymers has demonstrated that these structure are characterized by rather low persistence lengths which are of the order of 5-15 nm. It is thus interesting to investigate the effect of the two-dimensional ribbon-type structure on the shape of the chains in solution.…”

Section: Introductionmentioning

confidence: 99%

Characterization of a Ladder Polymer by Small-Angle X-ray and Neutron Scattering

Hickl¹,

Ballauff²,

Scherf³

et al. 1997

Macromolecules

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An analysis of the conformation of a ribbon-type polymer in dilute solution is given. By combination of small-angle neutron scattering (SANS) and small-angle X-ray scattering (SAXS) the effect of the finite dimensions of the repeating units can be assessed separately. It is thus possible to evaluate the experimental data to yield the form factor of the corresponding infinitely thin chain. This form factor could be evaluated for three samples differing in molecular weight and compared to the theoretical expression furnished by Kholodenko (Macromolecules 1993, 26, 4179). Good agreement for all molecular weights under consideration here could be achieved. The analysis shows that the ribbon-type polymers under consideration here are wormlike chains with a persistence length of 6.5 nm.

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“…For a very dilute solution, the weight‐averaged molar mass ( M w ) and the root mean‐square radius of gyration ( R g ) can be obtained on the basis of where H = 4π 2 n 2 (d n /d C ) 2 /( N A λ 4 ) and q = 4π n /λ sin(θ/2) with N A , n , d n /d C , and λ being the Avogadro's number, the solvent refractive index, the specific refractive index increment, and the wavelength of light in a vacuum, respectively. The d n /d C values of BPPAP in acetic acid and chloroform were obtained according to the literature, being 0.17 and 0.10, respectively 37. In dynamic LLS, the intensity–intensity time correlation function G (2) (τ) in the self‐beating mode was measured where A is the measured base line, β is a coherence factor, τ is the delay time, and g (1)(τ) is the normalized first‐order electric field time correlation function.…”

Section: Methodsmentioning

confidence: 99%

“…Thus a detailed understanding of the relationships among molecular structure, molecular association in the solution/film and optical property of polyimide film is of great significance 31–36. However, systematic studies on the solution behavior of polyimides, especially by laser light scattering (LLS) technique,37 are rarely reported in literature 38, 39…”

Section: Introductionmentioning

confidence: 99%

A method to break charge transfer complex of polyimide: A study on solution behavior

Ke¹,

Song²,

Liang³

et al. 2012

J of Applied Polymer Sci

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Charge transfer complex strongly affects the optical transparency of polyimide film. Here, solution behavior of a polyimide derived from 3,3 0 ,4,4 0 biphenyltetracarboxylic dianhydride and 1,4-bis(3-aminopropyl)piperazine in acetic acid, chloroform, and their mixed solvents is investigated in detail by light scattering. It is found that the polyimide existed as single chains in acetic acid owing to the acid-base interaction. However, association is observed in chloroform solution because of the charge transfer complex and enhanced by increasing the solution concentration. To break the charge transfer interaction and clear the association, only a small amount of acetic acid is required to add into the chloroform solution owing to the protonation of the diamine groups, confirmed by the zeta potential measurements. Simultaneously, the associates disappear quickly after addition of acetic acid. This study will provide a novel method for preparation of high optical transparent polyimide film by simply tuning the solvent.

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Characterization of a stiff-chain polyimide in solution

Cited by 18 publications

References 11 publications

Rod-like ruthenium(II) coordination polymers: synthesis and properties in solution

Rod-like ruthenium(II) coordination polymers: synthesis and properties in solution

Characterization of a Ladder Polymer by Small-Angle X-ray and Neutron Scattering

A method to break charge transfer complex of polyimide: A study on solution behavior

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