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Observations on the thermoreversible gelation of two-directional arborols in water–methanol mixtures

✍ Scribed by Keunok Han Yu; Paul S. Russo; Laura Younger; William G. Henk; Duen-Wu Hua; George R. Newkome; Gregory Baker

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
299 KB
Volume
35
Category
Article
ISSN
0887-6266

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✦ Synopsis

Reversible gels of two-directional cascade polymers with hydrophilic groups covalently attached by an hydrophobic center chain were studied by light and smallangle X-ray scattering, differential scanning calorimetry, and freeze-fracture transmission electron microscopy. The long, self-assembled fibers interact side-by-side over extended regions to form bundles. A given fiber may participate in several bundles, thus forming a three-dimensional gel network.

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## Abstract Transient electric birefringence of poly(L‐α,γ‐diaminobutyric acid hydrochloride) in methanol/water mixtures has been measured over a wide range of field strengths and solvent compositions and at different polymer concentrations and temperatures. The molar ellipticity at 222 nm and the