NDLI: Characterization, Solution Behavior, and Microstructure of a Hydrophobically Associating Nonionic Copolymer

Content Provider	Springer Nature Link
Author	Zhong, Chuanrong Huang, Ronghua Xu, Jinyong
Copyright Year	2008
Abstract	To obtain an oil-displacement polymer with good thermal stability and solution properties, self-assembling acrylamide (AM)/4-butylstyrene (BST) copolymers (PSA) were synthesized by the micellar copolymerization technique. The resulting polymer was characterized by elemental analysis and UV and FT-IR spectroscopy. Conventional DSC measurement was used successfully to characterize the hydrophobic microblock structure of PSA, and two glass transition temperatures were found in the polymer: at 203 °C for the AM segments and at 106 °C for the hydrophobic BST segments. The initial decomposition temperature (234 °C) of the polymer is higher than that of polyacrylamide (210 °C). The DSC and TG results suggest that incorporation of BST into PSA enhances the molecular rigidity and thermal stability of the polymer. The apparent viscosity of a PSA solution greatly depends on the amount of BST in the polymer, and the polymer exhibits salt-thickening, temperature-thickening, thixotropy, pseudo-plastic behavior, anti shearing, and good anti-aging properties at 80 °C. In addition, the apparent viscosities of PSA solutions are increased remarkably by the addition of a small amount of surfactant. AFM measurements show that large block-like aggregates and small compact aggregates are formed in aqueous solutions of 0.4 g⋅dL$^{−1}$ PSA because of strong intermolecular hydrophobic associations, despite the low molecular weight, and their sizes increase upon addition of a small amount of salt.
Starting Page	1227
Ending Page	1243
Page Count	17
File Format	PDF
ISSN	00959782
Journal	Journal of Solution Chemistry
Volume Number	37
Issue Number	9
e-ISSN	15728927
Language	English
Publisher	Springer US
Publisher Date	2008-07-12
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Acrylamide Atomic force microscopy (AFM) Differential scanning calorimetry (DSC) Hydrophobic association Micellar copolymerization Solution properties 4-Butylstyrene Condensed Matter Inorganic Chemistry Oceanography Geochemistry Industrial Chemistry/Chemical Engineering Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Biochemistry Molecular Biology Biophysics Physical and Theoretical Chemistry

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