Methoxy poly(ethylene glycol) (MPEG)-b-poly(ε-caprolactone) (PCL) diblock
copolymer was synthesized by ring-opening of ε-caprolactone (ε-CL) in the presence of a monomer
activator with the terminal alcohol of MPEG as an initiator. The temperature sensitive behavior of
the prepared MPEG-PCL diblock copolymer solution was examined. The polymer solution formed
translucent sol at the room temperature. As the temperature increased from room temperature, the
sol became gel, indicating that the diblock copolymer solution at room temperature can form gel at
body temperature. Brain-derived neurotrophic factor (BDNF) loaded MPEG-PCL diblock
copolymer solution and Pluronic solution for comparison were prepared to examine the release
behavior of BDNF. Pluronic gel exhibited nearly complete release of BDNF even at 2 day, while
the release of BDNF in MPEG-PCL gel showed the prolonged release profile for 21 days. In this
study, we confirmed that thermosensitive MPEG-PCL diblock copolymer in this work could utilize
as a potential carrier of BDNF.