Thermal Properties, Crystallinity, and Oxygen Permeability of Na-montmorillonite Reinforced Plasticized Poly(lactic acid) Film

• Main Authors: Kurniawan Yuniarto, Yohanes Aris Purwanto, Setyo Purwanto, Bruce A. Welt, Hadi Karia Purwadaria, Titi Candra Sunarti
• Format: Article
• Language: English
• Published: Universitas Indonesia 2016-04-01
• Series: Makara Journal of Technology
• Subjects: crystallinity, na-mmt, plasticized pla, permeability, thermal
• Online Access: http://journal.ui.ac.id/technology/journal/article/view/3105
• ISSN: 2355-2786; 2356-4539

<div><font color="#000000" face="Times New Roman, serif"><span style="font-size: 13.3333px; line-height: 14.2667px;">Introducing unmodified organically clay/Na-montmorillonite (Na-MMT) was applied into plasticized poly(lactic acid)&nbsp;</span></font><span style="font-size: 13.3333px; line-height: 14.2667px; color: rgb(0, 0, 0); font-family: 'Times New Roman', serif;">PLA &nbsp;to &nbsp;produce &nbsp;film &nbsp;composites &nbsp;by direct &nbsp;casting. &nbsp;Film &nbsp;composite &nbsp;structure, &nbsp;the &nbsp;crystallinity &nbsp;degree &nbsp;and &nbsp;form, and&nbsp;</span><span style="font-size: 13.3333px; line-height: 14.2667px; color: rgb(0, 0, 0); font-family: 'Times New Roman', serif;">thermal &nbsp;properties &nbsp;were &nbsp;carried &nbsp;out &nbsp;using &nbsp;X-ray &nbsp;diffraction &nbsp;and differential &nbsp;scanning &nbsp;calorimetry. &nbsp;The effect &nbsp;of NaMMT &nbsp;to &nbsp;the &nbsp;tortuous path &nbsp;and &nbsp;the &nbsp;crystallinity &nbsp;degree &nbsp;in &nbsp;the &nbsp;plasticized &nbsp;film &nbsp;composites &nbsp;were calculated &nbsp;in oxygen&nbsp;</span><span style="font-size: 13.3333px; line-height: 14.2667px; color: rgb(0, 0, 0); font-family: 'Times New Roman', serif;">barrier &nbsp;properties. &nbsp;Chromatogram &nbsp;film &nbsp;composites resulted &nbsp;in &nbsp;an &nbsp;intercalated &nbsp;structure &nbsp;that &nbsp;showed &nbsp;peak diffraction&nbsp;</span><span style="font-size: 13.3333px; line-height: 14.2667px; color: rgb(0, 0, 0); font-family: 'Times New Roman', serif;">angle shift at about 0.2</span><span style="font-size: 13.3333px; line-height: 14.2667px; color: rgb(0, 0, 0); font-family: 'Times New Roman', serif;">o</span><span style="font-size: 13.3333px; line-height: 14.2667px; color: rgb(0, 0, 0); font-family: 'Times New Roman', serif;">. Then, a peak diffraction pattern was indicated in &nbsp;α-form crystal structure. Plasticized PLA has&nbsp;</span><span style="font-size: 13.3333px; line-height: 14.2667px; color: rgb(0, 0, 0); font-family: 'Times New Roman', serif;">a crystallinity degree at 34%, and the addition of &nbsp;Na-MMT increased to 52%. Glass transition temperature improved&nbsp;</span><span style="font-size: 13.3333px; line-height: 14.2667px; color: rgb(0, 0, 0); font-family: 'Times New Roman', serif;">from 53 °C to 57 °C, and melting temperature remained stable at 167 °C. Filling Na-MMT into plasticized PLA caused&nbsp;</span><span style="font-size: 13.3333px; line-height: 14.2667px; color: rgb(0, 0, 0); font-family: 'Times New Roman', serif;">to enhance a tortuous path about 28% and improved the oxygen permeability to 80%. As a result, the addition of NaMMT of 3% into plasticized PLA during &nbsp;film composite preparation using the mixing method resulted in balancing&nbsp;</span><span style="font-size: 13.3333px; line-height: 14.2667px; color: rgb(0, 0, 0); font-family: 'Times New Roman', serif;">properties related to the crystallinity degree, thermal properties, and oxygen barrier properties.&nbsp;</span></div>