First cumulant of the dynamic structure factor for polymers in θ solvents. Effects of chain stiffness and local chain conformation

ABSTRACT The first cumulant Ω(_k_) of the dynamic structure factor as a function of the magnitude _k_ of the scattering vector was determined from dynamic light scattering (DLS) measurements

for two atactic poly(α-methylstyrene) (a-PαMS) samples with weight-average molecular weights _M_w=3.22×106 and 5.46×106 in cyclohexane at 30.5 °C (Θ) and for one polyisobutylene (PIB)

sample with _M_w=6.63×106 in isoamyl isovalerate at 25.0 °C (Θ). The translational diffusion coefficient was also determined from DLS measurements for the a-PαMS sample with the larger _M_w

and for the PIB sample in the same solvent conditions. The mean-square radius of gyration <_S_2> was determined from static light scattering measurements for the PIB sample. From a

comparison of the present data for a-PαMS and PIB along with the previous ones for atactic polystyrene and poly(_n_-hexyl isocyanate) with the helical wormlike chain theory, it may be

concluded that the universality predicted by the Gaussian chain theory for the plot of η0Ω(_k_)/_k_B_Tk_3 against <_S_2>1/2_k_ cannot be realized for flexible polymers even with very

high _M_w (\\simeq106–107), and that the height of the plateau in the _k_3-region depends on chain stiffness and local chain conformation, where η0 is the solvent viscosity, _k_B the

Boltzmann constant, and _T_ the absolute temperature. SIMILAR CONTENT BEING VIEWED BY OTHERS MOLECULAR DYNAMICS AND STRUCTURE OF POLYROTAXANE IN SOLUTION Article 27 January 2021 IMPACT OF

LOCAL STIFFNESS ON ENTROPY DRIVEN MICROSCOPIC DYNAMICS OF POLYTHIOPHENE Article Open access 19 June 2020 MOLECULAR-WEIGHT AND COOLING-RATE DEPENDENCE OF POLYMER THERMODYNAMICS IN MOLECULAR

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AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan Masashi Osa, 

Hiroshi Ueda, Takenao Yoshizaki & Hiromi Yamakawa Authors * Masashi Osa View author publications You can also search for this author inPubMed Google Scholar * Hiroshi Ueda View author

publications You can also search for this author inPubMed Google Scholar * Takenao Yoshizaki View author publications You can also search for this author inPubMed Google Scholar * Hiromi

Yamakawa View author publications You can also search for this author inPubMed Google Scholar CORRESPONDING AUTHOR Correspondence to Takenao Yoshizaki. RIGHTS AND PERMISSIONS Reprints and

permissions ABOUT THIS ARTICLE CITE THIS ARTICLE Osa, M., Ueda, H., Yoshizaki, T. _et al._ First Cumulant of the Dynamic Structure Factor for Polymers in Θ Solvents. Effects of Chain

Stiffness and Local Chain Conformation. _Polym J_ 38, 153–158 (2006). https://doi.org/10.1295/polymj.38.153 Download citation * Received: 10 August 2005 * Accepted: 05 October 2005 *

Published: 15 February 2006 * Issue Date: 01 February 2006 * DOI: https://doi.org/10.1295/polymj.38.153 SHARE THIS ARTICLE Anyone you share the following link with will be able to read this

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KEYWORDS * Poly(α-methylstyrene) * Polyisobutylene * Dynamic Light Scattering * Dynamic Structure Factor * First Cumulant * Helical Wormlike Chain