Molecular Weight and Structural Properties of Biodegradable PLA Synthesized with Different Catalysts th by Direct Melt Polycondensation  

Oleh:

Lee, Hyung Woo ; Insyani, Rizki ; Prasetyo, Daniel ; Prajitno, Hermawan ; Sitompul, ohnner

Jenis: Article from Journal - ilmiah nasional - terakreditasi DIKTI
Dalam koleksi: Journal of Engineering and Technological Sciences vol. 47 no. 4 (2015), page 364-373.
Topik: biodegradable PLA; polycondensation; catalyst; molecular weight; FT-IR
Fulltext: 1745-7161_her.pdf (255.51KB)

Isi artikel

Production of biodegradable polylactic acid (PLA) from biomassbased lactic acid is widely studied for substituting petro-based plastics or polymers. This study investigated PLA production from commercial lactic acid in a batch reactor by applying a direct melt polycondensation method with two kinds of catalyst, ?-aluminium(III) oxide (?-Al , 2014, Revised January 17 th 2 O ) or zinc oxide (ZnO), in reduced pressure. The molecular weight of the synthesized PLA was determined by capillary viscometry and its structural properties were analyzed by functional 3 group analysis using FT-IR. The yields of polymer production with respect to the theoretical conversion were 47% for ?-Al 2 O and 35% for ZnO. However, the PLA from ZnO had a higher molecular weight (150,600 g/mol) than that from ?Al 2 O 3 3 (81,400 g/mol). The IR spectra of the synthesized PLA from both catalysts using polycondensation show the same behavior of absorption peaks at wave numbers from 4,500 cm -1 to 500 cm -1 , whereas the PLA produced by two other polymerization methods – polycondensation and ring opening polymerization – showed a significant difference in % transmittance intensity pattern as well as peak area absorption at a wave number of 3,500 cm -1 as –OH vibration peak and at 1,750 cm -1 as –C=O carbonyl vibrational peak.

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