Detail of "25053-27-4"

Reference

Kinetics of polyelectrolyte complexation studied by the conductance stopped-flow technique

Kinetics of polyelectrolyte complexation studied by the conductance stopped-flow technique. The systems polyacrylate-polybrene and poly(ethylenesulfonate)-polyethylenimine. Okubo, Tsuneo; Hongyo, Kenichi; Enokida, Akira (Dep. Polym. Chem., Kyoto Univ., Kyoto, Japan). J. Chem. Soc., Faraday Trans. 1, 80(8), 2087-98 (English) 1984. CODEN: JCFTAR. ISSN: 0300-9599. DOCUMENT TYPE: Journal CA Section: 36 (Physical Properties of Synthetic High Polymers) Section cross-reference(s): 67, 68 The equil. assocn. const. for Na polyacrylate [9003-04-7] with polybrene [28728-55-4] increased with increasing degree of neutralization (a) and with decreasing polymer concn., while that for polyethylenimine [9002-98-6] with Na poly(ethylenesulfonate) [25053-27-4] was insensitive to both a and concn. Relaxation studies showed that complexation occurred by fast assocn. followed by slow reorientation. The enthalpy and entropy of activation of complexation increased markedly with increasing a, suggesting significant hydration of macroions and highlighting the importance of dehydration in complexation.

Distance distribution analysis of small-angle x-ray scattering for semidilute polyelectrolyte solutions without salts

Distance distribution analysis of small-angle x-ray scattering for semidilute polyelectrolyte solutions without salts. Kaji, Keisuke; Urakawa, Hiroshi; Kanaya, Toshiji; Kitamaru, Ryozo (Inst. Chem. Res., Kyoto Univ., Uji 611, Japan). Macromolecules, 17(9), 1835-9 (English) 1984. CODEN: MAMOBX. ISSN: 0024-9297. DOCUMENT TYPE: Journal CA Section: 36 (Physical Properties of Synthetic High Polymers) Small-angle x-ray scatterings for semidilute solns. of poly(vinylsulfonic acid) (I) [26101-52-0] and Li [27940-33-6], Na [25053-27-4], and K [27940-34-7] salts of I in the absence of added salts are analyzed in terms of an electron d. distance distribution. Two peaks in regard to intra- and intersegmental correlation are obsd. in the distance distribution function that was obtained by inverse Fourier-transform of small-angle x-ray scattering intensity. The intrasegmental correlation increases in intensity with no. of electrons of the counterion. This directly affects the condensation of counterions on the polyion. In relation to intersegmental correlation only a single peak is detected; the correlation distances are 88-101 ? for I and its salts in a concn. of 0.2 M. No longer correlation peaks are obsd. This suggests that only the nearest-neighbor intersegmental correlation exists in the semidilute soln. The max. position of the intersegmental correlation somewhat depends on the kind of counterion. This may be explained by inhomogeneous counterion condensation on the polyion.