Bis-Hydroxypropyl PEG

HO-(CH₂)₃-PEGn-O-(CH₂)₃-OH is a homobifunctional PEG diol featuring extended propylene glycol spacers, primarily used as a hydrophilic linker or crosslinker in hydrogel synthesis, polymer modification, and nanoparticle stabilization. Its key advantages include enhanced flexibility and reduced steric hindrance due to the spacer arms, tunable chain length (n), and high biocompatibility, though the terminal hydroxyl groups require activation (e.g., tosylation) for most covalent conjugation applications.