scholarly journals Molecular-Weight Dependence of Intramacromolecular End-to-End Photodimerization Rate of α,ω-Dianthryl-polystyrene in Dilute Solution

1983 ◽  
Vol 15 (11) ◽  
pp. 811-819 ◽  
Author(s):  
Hideharu Ushiki ◽  
Kimiko Hirayanagi ◽  
Yoichi Sindo ◽  
Kazuyuki Horie ◽  
Itaru Mita
Keyword(s):  
Molecular Weight ◽  
Dilute Solution ◽  
Molecular Weight Dependence ◽  
End To End

Unperturbed Dimensions of Atactic Poly(phenylacetylene)

2005 ◽  
Vol 70 (11) ◽  
pp. 1787-1798 ◽  
Author(s):  
Dana Rédrová ◽  
Jan Sedláček ◽  
Majda Žigon ◽  
Jiří Vohlídal
Keyword(s):  
Molecular Weight ◽  
Random Coil ◽  
Radius Of Gyration ◽  
Dilute Solution ◽  
Chain Branching ◽  
Unperturbed Dimensions ◽  
Molecular Weight Dependence ◽  
Atactic Polystyrene ◽  
Tetrahydrofuran Solution ◽  
Insight Into

Dilute solution characteristics of atactic (ca. 30% trans) poly(phenylacetylene), PPA, were determined by using the SEC/MALS technique in order to obtain a deeper insight into discrepancy between presumed rigidity of conjugated polyvinylene molecules and their random-coil behavior in solutions resulting from earlier viscometry measurements. PPA was found to exhibit the molecular-weight dependence of the radius of gyration in tetrahydrofuran solution similar to that of atactic polystyrene (saturated analogue of PPA); also unperturbed dimensions of these polymers are almost equal. This rather surprising observation is explained as a consequence of the increased π-π attraction between highly polarizable PPA segments with well-delocalized π-electrons, which compensates the effect of stiffening of these segments due to conjugation. Possible influence of chain branching is also discussed.

Molecular Weight Dependence of the Optical Rotation of Poly((R)-1-deuterio-n-hexyl isocyanate) in Dilute Solution

1996 ◽  
Vol 29 (8) ◽  
pp. 2878-2884 ◽  
Author(s):  
Naoko Okamoto ◽  
Fumika Mukaida ◽  
Hong Gu ◽  
Yo Nakamura ◽  
Takahiro Sato ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Optical Rotation ◽  
Dilute Solution ◽  
Molecular Weight Dependence

Molecular weight dependence of the noncrystalline component in dilute-solution-grown trans-1,4-polybutadiene crystals

1982 ◽  
Vol 15 (2) ◽  
pp. 338-342 ◽  
Author(s):  
S. Tseng ◽  
W. Herman ◽  
Arthur E. Woodward ◽  
B. A. Newman
Keyword(s):  
Molecular Weight ◽  
Dilute Solution ◽  
Molecular Weight Dependence
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