Synthesis of Iron (III) Stearate as Oxidant Additive for Polypropylene Oxo-biodegradable

• Main Author: Nur Najmi Fathiyah NIM : 20516044, Laila
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/28541
• Institution: Institut Teknologi Bandung

Polypropylene (PP) has been modified by the addition of iron stearate (FeSt3) as an oxidant additive for applications of PP oxo-biodegradable. Oxo-biodegradation process occurs in two stages, that are biotic and abiotic stage. At the stage of abiotic, PP undergo oxidative degradation due to the presence of FeSt3 as the oxidant additive and heating treatment, so that occurs the interruption of the main chain PS that generates shorter chain fragments that contain functional groups such as alcohols, aldehydes, ketones, and carboxylic. At the stage of biotic, biodegradation test was carried out by microorganism on solid medium. PP films with FeSt3 concentration of 0,1%, 0,5% and 1% (w/w) were heated at temperature of 60 ºC and 90 ºC for 10 days. Characteristics of the PP film before and after heating were analyze using FTIR spectroscopy (Fourier Transform Infrared), mechanical properties with tensile tester and thermal property with TGA (Thermogravimetric Analysis). PP film with the addition of 1% FeSt3 mass observed that increase in carbonyl index value, decrease in decomposition temperature after heating 90ºC for 10 days , stress and strain after heating 60 ºC for 10 days. The spectrum of FTIR for 1% FeSt3 after heating 90ºC and 60 ºC for 10 days shows the absorption peak at 1716 cm-1 indicating carbonyl group as degradation product. PP film with the addition of 1% FeSt3 was heated thermally 25 ºC, 60 ºC, and 90 ºC for 10 days to know the effect of temperature for PP oxo-biodegradable film. The result shows that At the same concentration of FeSt3, a higher heating temperature, PP film was faster degraded that was indicated by rapidly increasing index value of carbonyl in the FTIR results. At the stage of biotic, biodegradation test was conducted by measuring the weight loss of the polymer film after incubation for 5, 10, 20 and 30 days. The result shows that there is the wieght loss of PP oxo-biodegradable film by increasing incubation time. After incubation for 30 days, pure PP has 0,76 % weight loss, PP film with the addition of 1% FeSt3 without heating has 1,22 % weight loss, and PP film with the addition of 1% FeSt3 with heaating has 1,59 % weight loss and this result is supported by SEM analysis that shows cracking on the surface morpology of polymer film.