Thermal properties of extruded injection-molded poly(lactic acid) and milkweed composites: Degradation kinetics and enthalpic relaxation

2009 ◽  
Vol 111 (1) ◽  
pp. 175-184 ◽  
Author(s):  
Abdellatif A. Mohamed ◽  
V. L. Finkenstadt ◽  
D. E. Palmquist ◽  
P. Rayas-Duarte
Keyword(s):  
Lactic Acid ◽  
Thermal Properties ◽  
Degradation Kinetics ◽  
Poly Lactic Acid ◽  
Enthalpic Relaxation ◽  
Injection Molded

Thermal properties of extruded/injection-molded poly(lactic acid) and biobased composites

2007 ◽  
Vol 107 (2) ◽  
pp. 898-908 ◽  
Author(s):  
Abdellatif A. Mohamed ◽  
V. L. Finkenstadt ◽  
D. E. Palmquist
Keyword(s):  
Lactic Acid ◽  
Thermal Properties ◽  
Poly Lactic Acid ◽  
Injection Molded

Thermal properties of extruded and injection-molded poly(lactic acid)-based cuphea and lesquerella bio-composites

2009 ◽  
Vol 111 (1) ◽  
pp. 114-124 ◽  
Author(s):  
Abdellatif Mohamed ◽  
V. L. Finkenstadt ◽  
P. Rayas-Duarte ◽  
Palmquist Debra E ◽  
Sherald H. Gordon
Keyword(s):  
Lactic Acid ◽  
Thermal Properties ◽  
Poly Lactic Acid ◽  
Injection Molded

Effects of Processing Parameters and Nanofillers on Mechanical and Thermal Properties and Morphology of Impact Modified Poly (lactic acid)

2013 ◽  
Vol 1499 ◽  
Author(s):  
Eda Acik ◽  
Ulku Yilmazer
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Thermal Properties ◽  
Impact Strength ◽  
Random Copolymer ◽  
Processing Parameters ◽  
Poly Lactic Acid ◽  
Mechanical And Thermal Properties ◽  
Injection Molded ◽  
The Impact

ABSTRACTTernary nanocomposites of poly (lactic acid) (PLA) were produced by melt blending with two types of elastomers and five types of organoclays to obtain improved mechanical properties such as tensile strength, modulus and impact strength. One of the elastomers is a random copolymer of ethylene and glycidyl methacrylate (E-GMA) and the other one is a random terpolymer of ethylene-butyl acrylate-maleic anhydride (E-BA-MAH). Organically modified montmorillonites (OMMT) were utilized as nanofillers. XRD, DSC, tensile and impact tests were done on the injection molded samples. FTIR, SEM and TEM analyses are still in progress. As preliminary results, thermal analysis showed that the addition of compatibilizers and organoclays does not have a distinct effect on the thermal properties of the composites, and no evidence of nucleation activity of compatibilizers or organoclays was found. For all types of organoclays, the nanocomposites produced with E-GMA exhibited better mechanical properties in comparison to nanocomposites containing E-BA-MAH, especially for the impact strength.

The mechanical/thermal properties of microcellular injection-molded poly-lactic-acid nanocomposites

2008 ◽  
Vol 30 (11) ◽  
pp. 1625-1630 ◽  
Author(s):  
Shyh-Shin Hwang ◽  
Peming P. Hsu ◽  
Jui-Ming Yeh ◽  
Kung-Chin Chang ◽  
Ying-Zhong Lai
Keyword(s):  
Lactic Acid ◽  
Thermal Properties ◽  
Poly Lactic Acid ◽  
Injection Molded

Thermal degradation kinetics of Opuntia Ficus Indica flour and talc-filled poly (lactic acid) hybrid biocomposites by TGA analysis

2021 ◽  
pp. 002199832110082
Author(s):  
Azzeddine Gharsallah ◽  
Abdelheq Layachi ◽  
Ali Louaer ◽  
Hamid Satha
Keyword(s):  
Thermal Stability ◽  
Lactic Acid ◽  
Thermal Degradation ◽  
Degradation Kinetics ◽  
Degradation Mechanism ◽  
Melt Processing ◽  
Thermal Degradation Kinetics ◽  
Poly Lactic Acid ◽  
Opuntia Ficus Indica ◽  
Model Free

This paper reports the effect of lignocellulosic flour and talc powder on the thermal degradation behavior of poly (lactic acid) (PLA) by thermogravimetric analysis (TGA). Lignocellulosic flour was obtained by grinding Opuntia Ficus Indica cladodes. PLA/talc/ Opuntia Ficus Indica flour (OFI-F) biocomposites were prepared by melt processing and characterized using Wide-angle X-ray scattering (WAXS) and Scanning Electron Microscope (SEM). The thermal degradation of neat PLA and its biocomposites can be identified quantitatively by solid-state kinetics models. Thermal degradation results on biocomposites compared to neat PLA show that talc particles at 10 wt % into the PLA matrix have a minor impact on the thermal stability of biocomposites. Loading OFI-F and Talc/OFI-F mixture into the PLA matrix results in a decrease in the maximum degradation temperature, which means that the biocomposites have lower thermal stability. The activation energies (Ea) calculated by the Flynn Wall Ozawa (FWO) and Kissinger Akahira Sunose (KAS) model-free approaches and by model-fitting (Kissinger method and Coats-Redfern method) are in good agreement with one another. In addition, in this work, the degradation mechanism of biocomposites is proposed using Coats-Redfern and Criado methods.

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