3 aminopropyltriethoxysilane 2 OH-functionalized organotrialkoxysilanes 2 Poly(silsesquioxanes) 2 Polyhedral oligomeric silsesquioxanes (POSS) 2 S O C bonds 2 UV-MALDI-TOF MS 2 amide 2 article 2 carbon 2 catalyst 2 chemical bond 2 chemical reaction 2 chemical structure 2 controlled study 2 ether derivative 2 formic acid 2 gel permeation chromatography 2 hydrolysis 2 hydroxyl group 2 infrared spectroscopy 2 matrix assisted laser desorption ionization time of flight mass spectrometry 2 oxygen 2 polymerization 2 silane derivative 2 silicon 2 sodium hydroxide 2 synthesis 2 temperature 2 time 2 water 2