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- W2022061509 abstract "Solution properties of unfractionated phenolic resins prepared by polycondensation of phenol and formaldehyde using oxalic acid as a catalyst were investigated by dynamic light scattering (DLS) and small-angle neutron scattering (SANS). The hydrodynamic radius, obtained by DLS experiments with 1 vol % solution in acetone, and the correlation length, ξ, of the Ornstein–Zernike equation, obtained by SANS experiments with 10 vol % solution in tetrahydrofuran, obey a power-law relation as a function of z-average molecular weight estimated by gel permeation chromatography, with scaling exponents of 0.57 and 0.27, respectively. These behaviors are unaffected by polymerization conditions, such as initial phenol-to-formaldehyde molar ratio in the range from 0.9 to 1.5, catalyst concentration with oxalic acid-to-phenol molar ratio from 0.01 to 0.1, and reaction time within the period in which the polymer remains soluble. SANS curves for polymers prepared under different conditions are sufficiently superimposed onto a single curve with the reduced variables, ξ−2I(q) and ξq. These results indicate that unfractionated phenolic resins have a self-similar structure with respect to the molecular weight." @default.
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- W2022061509 date "2011-09-01" @default.
- W2022061509 modified "2023-10-05" @default.
- W2022061509 title "Dynamic light scattering and small-angle neutron scattering studies on phenolic resin solutions" @default.
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- W2022061509 doi "https://doi.org/10.1016/j.polymer.2011.06.059" @default.
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