Rahmayetty, Rahmayetty and Barleany, Dhena Ria and Irawan, Anton and Suhendi, Endang and Sukirno, Sukirno and Prasetya, Bambang and Gozan, Misri (2016) Artikel_Sintesis Polilaktida (PLA) dari Asam Laktat dengan Metode Polimerisasi Pembukaan Cincin Menggunakan Katalis Lipase. Prosiding Seminar Nasional Sains dan Teknologi. ISSN p-ISSN : 2407-1846; e-ISSN : 2460 – 8416

Text 3. SINTESIS POLILAKTIDA (PLA) DARI ASAM LAKTAT DENGAN.pdf - Published Version Download (551kB)

Abstract

Reduced fossil resources and the increasing concentration of carbon dioxide in the atmosphere has focused attention on the development of bio-based plastics. Efforts are made to utilize biological materials for conversion into an environmentally friendly biodegradable polymers. Polylactide (PLA) is the polymer that a versatile, biodegradable and derived from renewable resources that could be developed as a replacement for conventional plastic. Synthesis of polylactide (PLA) from lactic acid by the ring-opening polymerization method performed using 3-stage process, namely polycondensation, depolymerization and polymerization. Polycondensation produce oligomers, depolymerization process to convert oligomer into cyclic ester (lactide) and polymerization of lactide produced PLA. One of the factors that affect the molecular weight of the PLA was the optical purity of lactide. The purpose of this research was to to get the optimum catalyst concentration in synthesis of lactide through the stages of polycondensation, depolymerization and synthesis of PLA with ring-opening polymerization method using Candida rugosa lipase catalyst 1% (w/w). Stages of the research include the polycondensation of lactic acid was carried out gradually at 150 -180oC for 4 hours, the depolymerization process was carried out without the catalyst and variation of SnCl2 catalyst concentration (0.05; 0.1; 0.2% (w / w)) at 210oC, vacuum pressure for 3 hours, and the polymerization of lactide with at temperature variation of 45, 70 and 90 °C. From 1HNMR analysis of lactide showed that H quartet and H doublet proton shift was at 5.07- 5.02 ppm and 1.65-1.68 ppm. This indicates that the spectrum of lactide produce having an optical purity of L-lactide. Polymerization temperature affects the molecular weight of PLA. The molecular weight of PLA produced increases with increasing temperature of polymerization. The molecular weight of the PLA maximum produce was 2833 g / mol at 90 ° C.

Actions (login required)

View Item