Existing tissue adhesives have a
trade-off between adhesive strength
and biocompatibility. Here, we report a series of biocompatible multiarmed
polycaprolactones (PCL) as tissue adhesives that can be released from
a hot glue gun and the length of each arm was kept at ∼2–3
kg mol–1 in all the polymers. The adhesion properties
were dependent on the number of functionalized (N-hydroxysuccinimide ester (NHS), aldehyde (CHO), and isocyanate (NCO))
arms of the multiarmed polymers. The more arms, the higher the adhesion
strength. For example, the adhesion strength in binding cut rat skin
increased from 2.3 N cm–2 for 2PCL-NHS to 11.2 N
cm–2 for 8-PCL-NHS. CHO- and NCO-modified 8PCL also
had suitable adhesive properties. All the multiarmed polymers had
minimal cytotoxicity in vitro and good biocompatibility in vivo, suggesting their potential as promising alternative
surgical adhesives.