Synthesis of high molecular weight linear and branched polylactides: A comprehensive kinetic investigation

Karidi, Konstantina; Mantourlias, Theofanis; Seretis, Antonios; Pladis, Prokopis; Kiparissides, Costas

doi:10.1016/j.eurpolymj.2015.09.011

Cited by 17 publications

(7 citation statements)

References 57 publications

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“…The PLA sample exhibited a two-step decomposition, with a very subtle transition between the steps. The first step with T 5% of 245 °C ( T max of 300 °C) resulted in a weight loss of about 8.8% (Table ), indicating the presence of some remaining tin catalytic impurities, − left after polymerization. This step was followed by a second step, the decomposition of PLA, with T 5% of 320 °C ( T max of 377 °C).…”

Section: Results and Discussionmentioning

confidence: 99%

Ionic Liquid Platform for Spinning Composite Chitin–Poly(lactic acid) Fibers

Shamshina¹,

Zavgorodnya

Bertón

et al. 2018

ACS Sustainable Chem. Eng.

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In the design of stronger chitin fibers reinforced with poly(lactic acid) (PLA), an ionic-liquid-based (IL-based) approach was developed in which both polymers were codissolved in an 1-ethyl-3-methylimidazolium acetate ([C2mim][OAc]) and wet-jet spun into composite fibers. Chitin, directly extracted from shrimp shell, had a solubility in the IL of 2.75 wt %, while PLA of MW 700 000 g/mol had a solubility of 49 wt %. Keeping the IL saturated in chitin, homogeneous solutions of chitin and PLA could be obtained up to 27 wt % (relative to the IL) PLA. Spinning dopes were prepared by maintaining the chitin concentration relative to the IL at 1.75 wt % and adding PLA in chitin to PLA weight ratios of 1:0.1 through 1:1 (PLA concentrations of 0.175–1.75 wt % relative to the IL). Homogeneous chitin/PLA fibers could be spun when the chitin to PLA ratio was between 1:0.1 and 1:0.3. The tensile strength and plasticity of the fibers depended on the chitin to PLA ratio with the highest plasticity (8.8% vs 3.0% for pure chitin fibers), strength (112 vs 71 MPa), and stiffness (5.9 vs 4.2 GPa) observed for fibers with a chitin to PLA ratio of 1:0.3. Studies of the fracturing surface of the fibers indicated that fracturing occurred through an initial disruption of the interactions between polymer chains, followed by complete fiber breakage. The work not only demonstrates that homogeneous composite fibers can be spun using a biopolymer and PLA additive, but also suggests a versatile platform for preparation of multiple biopolymer–PLA materials using solution processing methods.

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Section: Results and Discussionmentioning

confidence: 99%

Ionic Liquid Platform for Spinning Composite Chitin–Poly(lactic acid) Fibers

Shamshina¹,

Zavgorodnya

Bertón

et al. 2018

ACS Sustainable Chem. Eng.

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“…Extensive computer modelling studies of alcohol-initiated and SnOct 2 -catalyzed ROPs at 130 °C performed by Morbidelli and co-workers should be mentioned. [83][84][85] More recently, extensive kinetic studies concerning the synthesis of linear and star-shaped PLLAs were reported by Karidi et al 86…”

Section: Polymer Chemistry Reviewmentioning

confidence: 99%

Syntheses of polylactides by means of tin catalysts

Kricheldorf

Weidner

2022

Polym. Chem.

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“…Due to the fact of its FDA approval for low toxicity it is a wide spread catalyst system which produces polymers with high molecular masses, proper yields and reasonable stereoregularity from various lactides and lactones [27,28]. Karidi et al [29] show that with simple variations of the initiator used in combination with Sn(Oct) 2 , branched polymers of all shapes can be produced. Furthermore, cyclic PLA is produced with the combination of Sn(Oct) 2 and new initiators by Kricheldorf et al [27] with molecular masses up to 170 000 g mol −1 .…”

Section: Introductionmentioning

confidence: 99%

Investigation of the influence of impurities on the ring-opening polymerisation of L-Lactide from biogenous feedstock

2020

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In order to use a L-lactide monomer that is derived from fermentation processes it is necessary to understand, how the polymerisation process is influenced by impurities which derive from the production process. We have selected a group of likely contaminants and added them at various concentrations to the polymerisation of L-lactide using tin (II)-2-ethylhexanoate as catalyst and 2-methoxyethanol as initiator. The effect of impurities onto the global properties of the polymers such as glass transition temperature, melting point and molecular mass distribution were investigated and NMR and MALDI mass spectrometry were used to identify structural changes within the polymers. Thus, it could be shown that in reference experiments cyclic polymers and linear polymers with different starting groups are formed. Addition of ethanol and sodium carbonate showed the strongest influence on molecular masses as well as polymer structures, which could be elucidated by interpretation of the MALDI mass spectra and NMR data.

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Synthesis of high molecular weight linear and branched polylactides: A comprehensive kinetic investigation

Cited by 17 publications

References 57 publications

Ionic Liquid Platform for Spinning Composite Chitin–Poly(lactic acid) Fibers

Ionic Liquid Platform for Spinning Composite Chitin–Poly(lactic acid) Fibers

Syntheses of polylactides by means of tin catalysts

Investigation of the influence of impurities on the ring-opening polymerisation of L-Lactide from biogenous feedstock

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