Modification of polyurethane by graft polymerization of poly(acrylic acid) for the control of molecular interaction and water compatibility

Abstract

Polyurethane (PU) was graft polymerized with poly(acrylic acid) (PA) to form a PA-grafted PU (UA) series, and a control PU (C) series containing free PA was also prepared for comparison. The grafted PA could be ionized, and an ionized PA-grafted PU (IUA) series was separately prepared. The spectroscopic, thermal, tensile, shape memory, low-temperature flexibility, and water permeability properties of the polymer series were compared. With an increase in the PA content, the T m did not change, but DH m decreased for the UA, IUA, and C series. The T g did not significantly change with the increase in PA content for the UA, IUA, and C series. The tensile strengths of the UA and IUA series sharply increased with the PA content, whereas that of the C series did not. The breaking strain of the UA, IUA, and C series remained the same with the increase in PA content. The shape recovery and shape retention of the PU-PA series remained high after four repeated tests. Finally, the IUA series PU demonstrated better low-temperature flexibility and water compatibility than the unmodified PU.

Graft polymerization of 4‐imidazole acrylic acid onto polyurethane for the improvement of water compatibility and antifungal activity

“…The carboxyl group content of the poly(IA) chains in the IA and CIA series were analyzed using a titration method with an aqueous NaOH solution , and the determined carboxyl content of the IA and CIA series proportionally increased with an increase in the IA feed. The actual carboxyl contents in the IA and CIA series were not quantitatively determined for comparison with the theoretical amount, but significant amounts of either grafted or free poly(IA) chains were present in the IA and CIA series (Fig.…”

Preparation and characterization of hydrophilic temperature‐dependent polyurethane containing the grafted poly(N‐isopropylacrylamide)

“…The mild graft‐polymerization method was previously tested for conversion of the hydrophobic PU surface to a hydrophilic form , enhancement of low temperature flexibility using polymer chains with bulky side groups , and development of antifungal PU with a hydrophilic surface . The hydrophobic PU surface was grafted with hydrophilic groups such as poly(acrylic acid) or poly(ethylene glycol) to increase the water compatibility and biocompatibility for the biomedical applications mentioned above.…”

Enhancement in Tensile Mechanical and Shape Recovery Properties of Polyurethane by Incorporating Graft‐polymerized Poly(tert‐Butyl Acrylate) into Polyurethane

“…The grafted groups demonstrated a long‐lasting functionalization compared with physical adsorption onto polymer surfaces because they were securely bonded to the polymer surface. The graft polymerization method has been frequently used due to its incorporation of repeating functional groups and an increased functional group density in the grafted polymer chains: the attachment of poly(ethylene glycol) methacrylate or poly(acrylic acid) onto PU by graft polymerization method made polymer surface water compatible . As a polymer frame, PU has been widely investigated due to its flexibility, reproducible recovery capability, and increasing worldwide consumption in various areas such as textile, coating, adhesive, flexible foam, rigid foam, and sealant .…”