Synthesis and Characterization of Poly(Lactic Acid)-Grafted Natural Rubber by Reactive Melt-Blending Technique
This study investigated the synthesis and characterization of poly(lactic acid)-grafted natural rubber (PLA-g-NR) in molten state. The grafting was carried out in an internal mixer without and with the presence of tin octoate catalyst (TO). The grafting of lactide onto NR was carried out by using maleic anhydride (MA) as a linker. The FTIR and 1H-NMR spectra revealed new peaks for the MA-grafted NR (NR-g-MA) and PLA indicating that MA was grafted onto NR and that LA was successfully polymerized into PLA. It was also found that MA grafted onto NR could assist as a linker for connecting PLA with NR via esterification reaction between hydroxyl group (OH) at the end chain of PLA and carboxylic group (COOH) from ring opening reaction of MA. Moreover, the decrease of residual LA peak in FTIR spectra suggested that the presence of TO catalyst in the reactive blend promoted higher degree of polymerization of PLA from ring opening reaction of LA.
Prof. Takahiro Ohashi and Muhammad Yahaya
Y. Wongngam and C. Pattamaprom, "Synthesis and Characterization of Poly(Lactic Acid)-Grafted Natural Rubber by Reactive Melt-Blending Technique", Defect and Diffusion Forum, Vol. 382, pp. 7-11, 2018