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Titolo:
Dynamic light-scattering characterization of the molecular weight distribution of unfractionated polyimide
Autore:
Siddiq, M; Wu, C;
Indirizzi:
Gomal Univ, Dept Chem, DI Khan, Pakistan Gomal Univ DI Khan PakistanGomal Univ, Dept Chem, DI Khan, Pakistan Chinese Univ Hong Kong, Dept Chem, Shatin, Hong Kong, Peoples R China Chinese Univ Hong Kong Shatin Hong Kong Peoples R China Peoples R China
Titolo Testata:
JOURNAL OF APPLIED POLYMER SCIENCE
fascicolo: 7, volume: 81, anno: 2001,
pagine: 1670 - 1674
SICI:
0021-8995(20010815)81:7<1670:DLCOTM>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Keywords:
dynamic laser light scattering; unfractionated polyimide; poly-(BCPOBDA/DMMDA); Rayleigh ratio; intensity-intensity time correlation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
18
Recensione:
Indirizzi per estratti:
Indirizzo: Siddiq, M Gomal Univ, Dept Chem, DI Khan, Pakistan Gomal Univ DI Khan Pakistan niv, Dept Chem, DI Khan, Pakistan
Citazione:
M. Siddiq e C. Wu, "Dynamic light-scattering characterization of the molecular weight distribution of unfractionated polyimide", J APPL POLY, 81(7), 2001, pp. 1670-1674

Abstract

Using a developed laser light-scattering (LLS) procedure, we accomplished the characterization of an unfractionated polyimide (UPI) in CHCl3 at 25 degreesC. The Laplace inversion of precisely measured intensity-intensity time correlation function from dynamic LLS leads us first to an estimate of the characteristic line-width distribution G(T), and then to the translational diffusion coefficient distribution G(D). By using a previously established calibration of D (cm(2)/s) = 3.53 x 10(-4) M-0.579, we were able to convert G(D) into a molecular weight distribution. The weight-average molecular weight M,, calculated from the molecular weight distribution, agrees well with that directly measured in static LLS. Our results indicate that both the calibration and LLS procedure used in this study are ready to be applied as a routine method fur the characterization of the molecular weight distribution of polyimide. (C) 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 1670-1674, 2001.

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Documento generato il 13/07/20 alle ore 14:40:13