Paper Title:
The Effect of Bacterial Cellulose on the Mechanical and Thermal Expansion Properties of Kenaf/Polylactic Acid Composites
  Abstract

The reinforcement of PLA matrix with natural fibers aims to generate the sustainable biocomposites. Kenaf fiber (KF) and bacterial cellulose (BC) were employed to reinforce and diminish the usage of PLA matrix. Particularly, BC is nano-cellulose which was anticipated to increased interfacial area and therefore low volume fractions of additives. That was consequently to attain mechanical property improvement. Thus, the incorporation of KF and BC reinforced PLA composites was investigated. The extrusion method was utilized and materials were mixed outside prior to adding. The specimens were examined mechanical testing, Dynamic Mechanical Analysis (DMA), Differential Scanning Calorimetry (DSC), Thermo Gravimetric Analysis (TGA) and Scanning Electron Microscopes (SEM). The mechanical study revealed that the increment of elastic modulus increased concomitantly with the augmentation of KF content. Interestingly, PLA/KF/BC sample at ratio of 60/39/1 wt.% was efficiently to maintain tensile and flexural strength comparing to 50% reduction of without BC sample with equal fiber volume. Therefore, it could recognize that mechanical properties was improved by using low amount of nano-cellulose. This would be a high aspect ratio of BC that capable to connect between PLA matrix and KF which enhanced a large contact surface and therefore excellent coherence. The temperature dependence of storage, loss and tan delta was determined by DMA. A decrease of storage modulus was consistent with increasing of temperature, result from softening of the composites. Loss modulus was increased approximately at Tg which related to storage modulus cause. In addition, the tan delta peaks of PLA and composites were around 60°C and it did not significantly shift when emerged of fiber. DSC of both composites indicated an influence of fiber on the crystallization and enthalpy. On the other hand, glass transition and melting temperature did not significantly affect. The composites exhibited a small reduction of thermal stability when examined by TGA analysis. Notwithstanding, BC showed an improvement of thermal stability of PLA/KF/BC sample at 40 wt.% total fiber content. The linkage of BC between PLA matrix and KF was monitored by SEM.

  Info
Periodical
Chapter
Chapter 7: Functional Materials
Edited by
Huixuan Zhang, Ye Han, Fuxiao Chen and Jiuba Wen
Pages
1343-1351
DOI
10.4028/www.scientific.net/AMM.117-119.1343
Citation
P. Sukyai, K. R. Sriroth, B. H. Lee, J. K. Hyun, "The Effect of Bacterial Cellulose on the Mechanical and Thermal Expansion Properties of Kenaf/Polylactic Acid Composites", Applied Mechanics and Materials, Vols. 117-119, pp. 1343-1351, 2012
Online since
October 2011
Keywords
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Hyo Jin Kim, Do Won Seo, Jae Kyoo Lim, Toru Fujii
417
Authors: Mohd Hafizuddin Ab Ghani, Ahmad Haji Sahrim
Abstract:We investigated the effects of amount of antioxidants variability on selected mechanical and physical properties of wood plastic composites....
151
Authors: Ying Cao, Li Pan
Chapter 2: Materials Science
Abstract:In the present investigation, resin transfer molding has been used to produce high quality carbon fiber epoxy composites and...
753
Authors: A. Quddos, Mohammad Bilal Khan, R.N. Khan, M.K.K. Ghauri
Abstract:The impregnation of the fiber with a resin system, the polymeric matrix with the interface needs to be properly cured so that the dimensional...
577
Authors: Anizah Kalam, M.N. Berhan, Hanafi Ismail
Chapter 1: Composites
Abstract:Hybrid composites were prepared by incorporating oil palm fruit bunch (OPFB) fibre in the mixture of clay and polypropylene as secondary...
154