TY - JOUR
T1 - Dynamic light scattering study on sol-gel transition of poly(γ-benzyl L-glutamate)-toluene solutions
AU - Oikawa, H.
AU - Korenaga, T.
AU - Nakanishi, H.
N1 - Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 1997
Y1 - 1997
N2 - The autocorrelation function (ACF) was measured at various temperatures using the dynamic light scattering (DLS) technique for two kinds of toluene solutions of poly(γ-benzyl L-glutamate) (PBLG): one was a semidilute PBLG (Mw = 2.3 × 105) solution far above the critical crossover concentration φ2* (PBLG-23), and the other was also a semidilute PBLG (Mw = 1.0×105) solution near φ2* (PBLG-10). Both of the PBLG solutions were sol at elevated temperatures and gelled with decreasing temperature. For PBLG-23, the ACF obtained in the sol phase could be fit well by a double-exponential function: the fast mode was due to a cooperative diffusive motion in a transient entangled PBLG-23 network; the slow mode was considered to be diffusive motion of aggregated PBLG-23 chains. On the other hand, the ACF of PBLG-10 was characteristic and was modulated vibrationally near the gelation threshold. This fact suggested strongly underdamped coupling between aggregated domains of PBLG-10 chains.
AB - The autocorrelation function (ACF) was measured at various temperatures using the dynamic light scattering (DLS) technique for two kinds of toluene solutions of poly(γ-benzyl L-glutamate) (PBLG): one was a semidilute PBLG (Mw = 2.3 × 105) solution far above the critical crossover concentration φ2* (PBLG-23), and the other was also a semidilute PBLG (Mw = 1.0×105) solution near φ2* (PBLG-10). Both of the PBLG solutions were sol at elevated temperatures and gelled with decreasing temperature. For PBLG-23, the ACF obtained in the sol phase could be fit well by a double-exponential function: the fast mode was due to a cooperative diffusive motion in a transient entangled PBLG-23 network; the slow mode was considered to be diffusive motion of aggregated PBLG-23 chains. On the other hand, the ACF of PBLG-10 was characteristic and was modulated vibrationally near the gelation threshold. This fact suggested strongly underdamped coupling between aggregated domains of PBLG-10 chains.
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U2 - 10.1080/00222349708220416
DO - 10.1080/00222349708220416
M3 - Article
AN - SCOPUS:0030784977
VL - B36
SP - 87
EP - 101
JO - Journal of Macromolecular Science - Physics
JF - Journal of Macromolecular Science - Physics
SN - 0022-2348
IS - 1
ER -