Infrared analysis, thermogravimetric analysis, and light scattering of grafted PCL-b-POEGMA on SiO2 NPs

Attachment of grafted PCL-b-POEGMA on SiO2 NPs was confirmed via thermogravimetric analysis (TGA) decomposition events in comparison to the linear free polymer analogue. IR (infrared analysis) was performed and it showed an increase in carbonyl and CH2 content, with a decrease in hydroxyl content as subsequent blocks were grafted from the NPs. Light scattering was used for confirmation of size changes in solution by Rh and/or Rg values in various solvents. Light scattering analysis also included size changes upon hydrocarbon uptake.