Please use this identifier to cite or link to this item:
Title: Studies on degradable polymeric blends based on poly lactic acid
Researcher: Singh, Gursewak
Guide(s): Bhunia, Haripada and Choudhary, Veena
Keywords: Engineering and Technology,Engineering,Engineering Chemical
University: Thapar Institute of Engineering and Technology
Completed Date: 2010
Abstract: Melt blending of linear low density polyethylene (LLDPE) and poly(L-lactic acid) (PLLA) was performed in an extrusion mixer with post extrusion blown film attachment with and without compatibilizer i.e. maleic anhydride grafted low density polyethylene. The blend compositions were optimized for tensile properties as per ASTM D 882-91. Based on this, blend sample having 80 wt % LLDPE and 20 wt % PLLA i.e. sample LLDPE 80 and 80 wt % LLDPE, 20 wt % PLLA and 4 parts compatibilizer per hundred parts of resin i.e. sample M-g-L 80/4 were found to have an optimum composition of performance properties; the effect of blending on the mechanical, thermal and morphological characteristics was done. The blends were characterized using mechanical, thermal and morphological behavior. Morphological characteristics of film surface and fracture surface of polymer blends in absence and presence of compatibilizer were examined using scanning electron microscopy. It has been observed that the dispersion of PLLA in LLDPE matrix improved in presence of compatibilizer. FTIR reveals that the presence of compatibilizer shifts carbonyl peak indicating some increase in interaction between LLDPE and PLLA. Thermogravimetric (TG) analysis of blends showed that the M-g-L 80/4 blend has highest thermal stability as compared to LLDPE/PLLA blends of varying composition. The thermogravimetric profile and thermal endurance of these blends were characterized as per ASTM E1641- 07 and E1877-05. The effect of physical aging on mechanical and thermal properties of these blends was evaluated. PLLA showed the highest Arrhenius activation energy, relative thermal index and strongest thermal endurance of all samples followed by M-g- L 80/4 and LLDPE 80. The thermo-oxidation coefficient improved with addition of xx compatibilizer in the blends. With increasing pH, hydrolytic degradation of the blend films increased, while both the tensile strength and the elongation at break of the blend films decreased.
Pagination: xx, 127p.
Appears in Departments:Department of Chemical Engineering

Files in This Item:
File Description SizeFormat 
file10(references).pdfAttached File234.24 kBAdobe PDFView/Open
file1(title).pdf103.19 kBAdobe PDFView/Open
file2(certificate).pdf202.81 kBAdobe PDFView/Open
file3(preliminarypages).pdf662.28 kBAdobe PDFView/Open
file4(chapter1).pdf410.19 kBAdobe PDFView/Open
file5(chapter2).pdf274.22 kBAdobe PDFView/Open
file6(chapter3).pdf1.12 MBAdobe PDFView/Open
file7(chapter4).pdf1.2 MBAdobe PDFView/Open
file8(chapter5).pdf1.53 MBAdobe PDFView/Open
file9(chapter6).pdf166.31 kBAdobe PDFView/Open

Items in Shodhganga are protected by copyright, with all rights reserved, unless otherwise indicated.

Altmetric Badge: