000			03242nam a2200241 a 4500
001			vtls000066530
003			KUKTEM
005			20251114204526.0
008			121119t2012 my da f m 000 0 eng d
020			_aTHE0004364(Local)
039		9	_a201905161114 _brohana _c201905161113 _drohana _c201905161113 _drohana _y201211191513 _zFida
040			_aUMP
090			_aTP248.L3 N67 2012 rs Bc.
100	0		_aNorayuni Azizi
245	1	0	_aBiodegradable behaviour of polylactic acid nanocomposite based on modified nanoclay / _cNorayuni Azizi
260			_aKuantan, Pahang : _bUMP, _c2012
300			_axiii, 84 p. : _bill. (some col.) ; _c30 cm. + _e1 CD-ROM
502			_aProject paper (Bachelor of Chemical Engineering) -- Universiti Malaysia Pahang - 2012
504			_aBibliography: p. 63-67
520	3		_aPolylactic acid (PLA) is a unique polymer. Eventually, this polymer has the broadest range of application especially in biomedical field due to its biocompatibility characteristics. The main purpose of this research is to study on the biodegradable properties of PLA based on modified organoclay. The properties of PLA nanocomposite will be improved by adding nanoclay or Montmorillonite (MMT) and produce PLA nanocomposite. The MMT that used in this research is bis-(2-hydroxyethyl) methyl tallow alkyl ammonium cations (Cloisite B30). A series of PLA nanocomposite was classified by different percentage of compositions and the samples were analysed and compared with pristine PLA. PLA nanocomposite was produced by melt intercalation method using twin screw extruder. Then, the compounds were injection molded by injection molding method and formed dumbbell shape. Meanwhile, PLA nanocomposite is characterized by Scanning Electron Microscopy (SEM) and X–Ray Diffraction Analysis (XRD). However, SEM captures could not determine the dispersion of Cloisite B30 precisely nevertheless it illustrates that aggregates were formed in the images. XRD result supported an exfoliation nanocomposite was possible demonstrated as no diffraction peak was appeared in the XRD results. It also shows that the inter-galleries spacing of the Cloisite B30 between PLA matrixes is too wide. Subsequently, the samples were tested using accelerated weathering tester for biodegradable analysis. Finally, the samples before and after exposed in the accelerated weathering tester were examined by mechanical testing to determine mechanical properties such as ultimate strain, elastic modulus and ultimate stress using tensile strength testing. The most desired result of this research is based on the biodegradable testing. After a year observation, only pristine PLA was sustained in strength while the PLA nanocomposite is so brittle. Meanwhile for a year and half observation, all the samples were so brittle. It can be concluded that the pristine PLA is still remain sustain after a year but it start to degrade after a year and half. The result obtained for before exposing under accelerated weathering tester, the pristine PLA possesses good properties for ultimate strain and ultimate stress rather than elasticity behaviour.
650		0	_aLactic acid
999			_aVIRTUA40 _c3534 _d3540
999			_aVTLSSORT0080*0200*0400*0900*1000*2450*2600*3000*5020*5040*5200*6500*9992