The Manganese thioglycolate (Mn-TG) end capped poly(epsilon-caprolactone) (PCL) was prepared by ring opening polymerization at 160 degrees C under inert atmosphere in the presence of Mn-TG as an initiator and stannous octoate as a catalyst by bulk polymerization technique. The prepared PCL was investigated using various analytical tools to assess its physico-chemical properties. The chemical structure of PCL was confirmed by Fourier transform infrared and nuclear magnetic resonance spectroscopic techniques. The particle size and morphology of the sample was examined by atomic force microscopy and TEM. The melting and crystallization behavior of PCL was analyzed using differential scanning calorimetry. The thermal property of PCL was assessed with the help of thermogravimetric analysis (TGA). The non-isothermal crystallization kinetics was carried out to understand the nucleation type and crystal growth for the prepared PCL. The energy of activation (E-a) for crystallization process of PCL was determined. The thermal degradation of PCL and its E-a was determined under non-isothermal condition using important kinetic models. POLYM. ENG. SCI., 59:633-642, 2019. (c) 2018 Society of Plastics Engineers