Study on the chemical modification of epoxy/anhydride thermosets using a hydroxyl terminated hyperbranched polymer

Impact of Structure and Functionality of Core Polyol in Highly Functional Biobased Epoxy Resins

“…The presence of hydroxyls in epoxy-anhydride curing has been proposed to facilitate polyester network formation through the fast reaction between hydroxyl and anhydride. [26,27] The advantages of hydroxyls in ESSB6-anhydride curing have been shown in the previous study. [20] The tensile, dynamic mechanical and thermal properties of the thermosets are summarized in Table 2.…”

Covalently coating dextran on macroporous polyglycidyl methacrylate microsphere enabled rapid protein chromatographic separation

“…One is that its macropores (more than 200 nm) facilitate hydrophilic polymer diffusion into the interior of the microsphere compared to the conventional porous polymer particles with 10-30 nm pores. Another is that PGMA-DVB surface has high content of epoxy groups, which easily react with hydroxyl groups of the hydrophilic molecules [19,20]. Meanwhile, the surface of PGMA-DVB shows weak hydrophobicity due to lots of epoxy group compared with those of PS-DVB.…”

Synthesis and characterization of amino-terminated hyperbranched polymer and its effect on impact resistance of epoxy resin thermosets

“…Hyperbranched polymers (HBPs) are a subfamily of dendritic polymers [15,16] and can be used as effective polymer modifiers of thermosetting materials especially epoxy resins [17], due to (1) their unique sphere structure networks, which makes them with low viscosity than linear polymer with the same molar mass [18] and can reduce the shrinkage of epoxy resins owing to the stretching after terminal groups interacting with other functional groups of epoxy resins and/or curing agents [19][20][21]; (2) their high density and versatile functional terminal groups such as hydroxyl, amine, epoxide groups, anhydride, carboxylic, and isocyanate, which can greatly enhance the compatibility between HBPs and epoxy matrixes; and (3) a lot amount of free volumes in their networks, which can sharply improve the toughness of epoxy resins when HBPs are used as modifiers [19,22]. H. Wu et al [23] reported that the viscosity difference caused by HBP end group was not due to the reaction between epoxide ring and the end groups of HBP but may be due to the lower viscosity of HBP with hydroxyl groups than that of HBP with acetyl groups.…”