Environmental pH-responsive fluorescent PEG-polyurethane for potential optical imaging

PH Responsive Polyurethane for the Advancement of Biomedical and Drug Delivery

Due to the specific physiological pH throughout the human body, pH-responsive polymers have been considered for aiding drug delivery systems. Depending on the surrounding pH conditions, the polymers can undergo swelling or contraction behaviors, and a degradation mechanism can release incorporated substances. Additionally, polyurethane, a highly versatile polymer, has been reported for its biocompatibility properties, in which it demonstrates good biological response and sustainability in biomedical applications. In this review, we focus on summarizing the applications of pH-responsive polyurethane in the biomedical and drug delivery fields in recent years. In recent studies, there have been great developments in pH-responsive polyurethanes used as controlled drug delivery systems for oral administration, intravaginal administration, and targeted drug delivery systems for chemotherapy treatment. Other applications such as surface biomaterials, sensors, and optical imaging probes are also discussed in this review.

Synthesis of polymeric dyes based on waterborne polyurethane for improved color stability

The color stability of disperse dye was enhanced via covalent bonding to waterborne polyurethane.

A high-performance polyurethane sponge for the detection, adsorption and separation of Cu2+ ions

A small chemosensor, 2-(2-hydroxy-ethyl)-6-(quinolin-8-ylamino)-benzo[de]isoquinoline-1,3-dione was firstly synthesized and then was introduced into a PU sponge. The as-prepared sponge showed excellent ability to detect and remove Cu²⁺ ions.