Kinetics of Polymerization of Poly (Lactic Acid) under Different Environments

2018 ◽  
Vol 8 (4) ◽  
pp. 713-720
Author(s):  
Paramjit Kaur
Keyword(s):  
Lactic Acid ◽  
Poly Lactic Acid ◽  
Kinetics Of Polymerization ◽  
Kinetics Of

scholarly journals Kinetics of Alkyl Lactate Formation from the Alcoholysis of Poly(Lactic Acid)

Processes ◽  
2020 ◽  
Vol 8 (6) ◽  
pp. 738
Author(s):  
Fabio M. Lamberti ◽  
Luis A. Román-Ramírez ◽  
Paul Mckeown ◽  
Matthew D. Jones ◽  
Joseph Wood
Keyword(s):  
Lactic Acid ◽  
Activation Energies ◽  
Poly Lactic Acid ◽  
Chemical Recycling ◽  
Green Solvents ◽  
Temperature Dependent ◽  
Exponential Factors ◽  
Autogenous Pressure ◽  
Lactate Formation ◽  
Kinetics Of

Alkyl lactates are green solvents that are successfully employed in several industries such as pharmaceutical, food and agricultural. They are considered prospective renewable substitutes for petroleum-derived solvents and the opportunity exists to obtain these valuable chemicals from the chemical recycling of waste poly(lactic acid). Alkyl lactates (ethyl lactate, propyl lactate and butyl lactate) were obtained from the catalysed alcoholysis reaction of poly(lactic acid) with the corresponding linear alcohol. Reactions were catalysed by a Zn complex synthesised from an ethylenediamine Schiff base. The reactions were studied in the 50–130 °C range depending on the alcohol, at autogenous pressure. Arrhenius temperature-dependent parameters (activation energies and pre-exponential factors) were estimated for the formation of the lactates. The activation energies (Ea1, Ea2 and Ea−2) for alcoholysis in ethanol were 62.58, 55.61 and 54.11 kJ/mol, respectively. Alcoholysis proceeded fastest in ethanol in comparison to propanol and butanol and reasonable rates can be achieved in temperatures as low as 50 °C. This is a promising reaction that could be used to recycle end-of-life poly(lactic acid) and could help create a circular production economy.

Nucleation and crystallization kinetics of poly(lactic acid)

2011 ◽  
Vol 522 (1-2) ◽  
pp. 128-134 ◽  
Author(s):  
Felice De Santis ◽  
Roberto Pantani ◽  
Giuseppe Titomanlio
Keyword(s):  
Lactic Acid ◽  
Crystallization Kinetics ◽  
Poly Lactic Acid ◽  
Kinetics Of

scholarly journals Enhanced thermal decomposition kinetics of poly(lactic acid) sacrificial polymer catalyzed by metal oxide nanoparticles

RSC Advances ◽  
2015 ◽  
Vol 5 (123) ◽  
pp. 101745-101750 ◽  
Author(s):  
Lu Liu ◽  
Michael R. Zachariah ◽  
Stanislav I. Stoliarov ◽  
Jing Li
Keyword(s):  
Thermal Decomposition ◽  
Lactic Acid ◽  
Metal Oxide ◽  
Metal Oxide Nanoparticles ◽  
Solvent Evaporation ◽  
Decomposition Kinetics ◽  
Thermal Decomposition Kinetics ◽  
Poly Lactic Acid ◽  
Oxide Nanoparticles ◽  
Kinetics Of

Poly Lactic Acid (PLA) and 1 wt% PLA/Fe2O3, PLA/CuO, PLA/Bi2O3 composites are prepared by solvent evaporation casting and their enhanced thermal decomposition kinetics catalyzed by low loading metal oxide nanoparticles are studied.

scholarly journals Crystallization Kinetics of Poly(lactic acid)–Graphene Nanoscroll Nanocomposites: Role of Tubular, Planar, and Scrolled Carbon Nanoparticles

2021 ◽  
Vol 7 (4) ◽  
pp. 75
Author(s):  
Oluwakemi Ajala ◽  
Caroline Werther ◽  
Rauf Mahmudzade ◽  
Peyman Nikaeen ◽  
Dilip Depan
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Crystallization Kinetics ◽  
Crystallization Rate ◽  
Melting Behavior ◽  
Degree Of Crystallinity ◽  
Poly Lactic Acid ◽  
Avrami Model ◽  
Superior Mechanical Properties ◽  
Kinetics Of

Graphene nanoscrolls (GNS) are 1D carbon-based nanoparticles. In this study, they were investigated as a heterogeneous nucleating agent in the poly(lactic acid) (PLA) matrix. The isothermal and non-isothermal melting behavior and crystallization kinetics of PLA-GNS nanocomposites were investigated using a differential scanning calorimeter (DSC). Low GNS content not only accelerated the crystallization rate, but also the degree of crystallinity of PLA. The Avrami model was used to fit raw experimental data, and to evaluate the crystallization kinetics for both isothermal and non-isothermal runs through the nucleation and growth rate. Additionally, the effect of the dimensionality and structure of the nanoparticle on the crystallization behavior and kinetics of PLA is discussed. GNS, having a similar fundamental unit as CNT and GNP, were observed to possess superior mechanical properties when analyzed by the nanoindentation technique. The scrolled architecture of GNS facilitated a better interface and increased energy absorption with PLA compared to CNTs and GNPs, resulting in superior mechanical properties.

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