Temperature and solvent dependence of stiffness of poly{n-hexyl-[(S)-3-methylpentyl]silylene} in dilute solutions

Citation
K. Terao et al., Temperature and solvent dependence of stiffness of poly{n-hexyl-[(S)-3-methylpentyl]silylene} in dilute solutions, MACROMOLEC, 34(13), 2001, pp. 4519-4525
Citations number
31
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
MACROMOLECULES
ISSN journal
0024-9297 → ACNP
Volume
34
Issue
13
Year of publication
2001
Pages
4519 - 4525
Database
ISI
SICI code
0024-9297(20010619)34:13<4519:TASDOS>2.0.ZU;2-J
Abstract
Eleven samples of poly{n-hexyl- [(S)-3-methylpentyl]silylene} (PH3MPS) rang ing in weight-average molecular weight M-w from 3.1 x 10(3) to 8.7 x 10(5) in isooctane have been studied by light scattering at 25 degreesC, sediment ation equilibrium at 25 degreesC, and viscometry at five temperatures (-27, -15, 5, 25, and 45 degreesC) to determine their z-average radii of gyration (S-2)(x), second virial coefficients, and intrinsic viscosities [eta] The (S-2)(x) and [eta] data are analyzed quantitatively by the current theories on the basis of the wormlike chain with excluded volume over the entire ra nge of M, studied. PH3MPS is shown to be a typical semiflexible polymer wit h the persistence length changing from 15.4 to 5.0 nm at -27 to 45 degreesC . The viscometry has also been made on a PH3MPS sample in n-hexane and meth ylcyclohexane at 25 degreesC. In these solvents, the global conformation of PH3MPS is essentially the same as that in isooctane at the same temperatur e.