Solution properties of biobased hyperbranched polyols investigated by multiple‐detection size exclusion chromatography

Abstract

We used multiple‐detection size exclusion chromatography and batch‐mode light scattering to follow the structural development of hydroxylated fatty acid methyl esters of soybean oil into hyperbranched (HB) polyol during polymerization by analyzing samples, collected at different times, in dilute solutions in tetrahydrofuran. The size of HB molecules was, as expected, smaller and more compact than that of their linear analogues of the same molecular weight (MW). Additionally, HB polyols were roughly spherical in shape. Plots of MW as a function of retention time and plots of the radius of gyration (Rg) as a function of MW showed an upturn; this indicated mixing of the high‐MW components in late‐eluting fractions, caused by either adsorption onto or trapping by the pore. For region of the plot before the turning points, the exponent in the Mark–Houwink equation was between 0.3 and 0.4. The exponent in the power relationship between Rg and MW was also below 0.5. It appeared that the shape of molecules for the same MW varied with the progress of the synthesis, as observed by a slope change in the viscometric radius dependence on MW for different HB polyol samples. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2012

Estolide Molecular Weight Distribution via Gel Permeation Chromatography

“…The values of ( α + 1) for estolide acid and esters are low compared to the slope of poly(hydroformylated methyl oleate) (PHFMO), determined in THF at 30 °C (Milic et al, ). PHFMO has a structure that is close to (but different from) the structure of the estolides.…”

Advancements in polyurethane coating: Synthesis and characterization of a novel hyper branched polyester polyol

“…The size and shape of the hyper branched polyester polyol molecules can vary depending on the degree of branching and the length of the polymer chains 49 . Overall, the molecular structure of hyper branched polyester polyol plays a crucial role in determining its physical and chemical properties, making it an important material for various industrial applications such as coatings, adhesives, and composites.…”

Hyperbranched polyesters by polycondensation of fatty acid-based ABn-type monomers

“…35 As for Petrović et al, they have developed two synthetic pathways to HBPEs from hydroxylated FAMEs obtained either by (i) hydrogenation 36 of epoxidized soybean oil or by (ii) hydroformylation. 37,38 High molar masses (up to 42 000 g.mol -1 ) have been obtained only in the latter case, with a weight average hydroxyl functionality of the polymer up to 23.2. Note, however, that no DB value has been reported.…”