00000ctm a22000004i 4500 UP-99796217611761500 Buklod 20230215105418.0 m |o d | ta 150910s xx d r |||| u| (iLib)UPD-00249805995 DENG rda eng DMLUC LG 995 2015 E62 A73 Arabit, Jimyl M. author. Surface migration of additives in surfactant-loaded natural rubber vulcanizates thesis by Jimyl M. Arabit ; Bryan B. Pajarito, adviser. Quezon City College of Engineering, University of the Philippines Diliman 2015. xi, 81 leaves illustrations 28 cm. text rdacontent unmediated rdamedia volume rdacarrier Thesis (M.S. Chemical Engineering)--University of the Philippines Diliman June 2015. Available to the general public. Surface migration of additives and tensile properties in surfactant-loaded natural rubber vulcanites are investigated as function of ingredient loading and temperature. Rubber sheets are compounded according to an L12 orthogonal array using Taguchi design of experiment. Migration experiments are performed by placing the rubber sheets in a natural convection oven at 40, 50, and 60°C for 32 days. Weight loss due to removal of migrated additives from surface of rubber sheets is monitored with time. Results show that the amount of migration and initial migration rate are decreased at low loadings of cocamide diethanolmide (coca DEA) and glycerol monostearate (GMS). Low loadings at 40 and 60°C and high loadings at 50°C of coca DEA and low loading of GMS increase tensile strength. Attenuated total reflection - Fourier transform infrared (ATR-FTIR) spectroscopy and optical microscopy are used to characterize the chemical structure and surface morphology of rubber sheets during additive migration. By comparing the ATR-FTIR spectra of cleaned and migrated rubber surfaces, zinc stearate, stearic acid, paraffin wax, used oil, cocamide diethanolamide (coca DEA), and gycerol monostearate (GMS) are identified to have migrated to the rubber surface. Compared to a previous study, MBT was inhibited to bloom in the presence of surfactants as their polar ends attract the polar additiv Rubbe. Surface migratio. Bloomin. Pajarito, Bryan B. advise. Thes UPD DARCHIVES LG 995 2015 E62 A73 UPD DENG-II LG 995 2015 E62 A73 Thesis