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Study of chemical and thermal properties of kenaf biomass-based polylactic acid (PLA)

Mohd Nasir, Nur Aimi and Anuar, Hazleen and Mel, Maizirwan and Othman, Rashidi and Mohamed, Nurhafizah Seeni and Mohd Ithnin, Ahmad Fitrie and Uyup, Mohd Khairun Anwar (2014) Study of chemical and thermal properties of kenaf biomass-based polylactic acid (PLA). Advances in Environmental Biology, 8 (3 Spec. Issue). pp. 633-638. ISSN 1995-0756 E-ISSN 1998-1066

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Abstract

The development of polylactic acid (PLA) from natural source remains a great challenge. PLA can be produced from its monomer (i.e. lactic acid) via fermentation process. In this study, the production of PLA from kenaf biomass was investigated. It was started with the introduction of kenaf biomass as the renewable source. Since kenaf is a lignocellulosic material, pretreatment process is preferable prior to the fermentation process. Different types of pretreatment methods have been investigated. However, the dilute acid hydrolysis method has been chosen in this project due to its outstanding advantages compared to other processes. After the pretreatment process, kenaf biomass was degraded twice with own isolatedRhizopusoryzae strain in the fermentation process. Next, polymerization process was performed to produce PLA. Polylactic acid obtained was analyzed via Fourier transform infrared (FTIR) and differential scanning calorimetry (DSC). From the FTIR analysis, it can be seen that PLA was successfully produced from kenaf biomass especially at 1,741.42 cm-1 and the band around the region of 1,650-1,450 cm-1when compared to the commercial PLA. In terms of thermal properties, the glass transition temperature (Tg) of PLA from kenaf biomass was around 74.83oC, with its melting temperature (Tm) was in the range of 122 to 125oC, whereas its crystallization temperature (Tc) was not clearly observed. Low molecular weight (444 to 543 g/mol) and low polydispersity index (PD) (1.2) of PLA produced from kenaf biomass by gel permeation chromatography (GPC) analysis indicated that the polymer hasa poor stability state.

Item Type: Article (Journal)
Additional Information: 4130/36626
Uncontrolled Keywords: Polylacticacid (PLA), kenafbiomass, Rhizopusoryzae, fermentation, pretreatment
Subjects: T Technology > TP Chemical technology > TP1080 Polymers, plastics and their manufacture
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): Kulliyyah of Architecture and Environmental Design > Department of Landscape Architecture
Depositing User: Dr Hazleen Anuar
Date Deposited: 14 May 2014 15:26
Last Modified: 26 Sep 2017 11:41
URI: http://irep.iium.edu.my/id/eprint/36626

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