Chemistry and Thermodynamic Properties of Lactic Acid and Lactide and Solvent Miscibility

Jin, Zhengyu; Tian, Yaoqi; Wang, Jinpeng

doi:10.1002/9780470649848.ch2

Cited by 7 publications

(7 citation statements)

References 14 publications

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“…The results of the homologous series of ethyl esters show that the most hydrophobic component ethyl hexanoate had the highest solubility coefficient, most likely due to its structure similar to the PLA chain. In the case of benzaldehyde which presented the highest S, the high affinity may be explained by the well-known miscibility of PLA with aromatic solvents such as toluene and benzene [37]. Ethyl-2-methylbutanoate had comparable S compared to that of ethyl butyrate, which hints that the additional methyl group does not change the behaviour of the molecule in the polymer structure.…”

Section: Aroma Compounds Sorptionmentioning

confidence: 95%

Plasticization of poly(lactide) by sorption of volatile organic compounds at low concentration

Salazar

Domenek

Courgneau

et al. 2012

Polymer Degradation and Stability

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Section: Aroma Compounds Sorptionmentioning

confidence: 95%

Plasticization of poly(lactide) by sorption of volatile organic compounds at low concentration

Salazar

Domenek

Courgneau

et al. 2012

Polymer Degradation and Stability

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“…Benzaldehyde presented a solubility coefficient in PLLA that was ten times higher than that in PP [152], which could lead to solvent-induced crystallization and plasticization and, thus, changes in PLLA barrier properties [152]. The high affinity of PLLA for molecules with aromatic functions can be explained by the miscibility of PLLA with aromatic solvents such as toluene and benzene [153,154]. In mixture, the presence of benzaldehyde favors the interaction and sorption of other organic compounds in PLLA [152].…”

Section: Permeability Of Organic Vapors Through Pllamentioning

confidence: 99%

Rheology, Mechanical Properties, and Barrier Properties of Poly(lactic acid)

Domenek¹,

Fernandes-Nassar²,

Ducruet³

2017

Synthesis, Structure and Properties of Poly(lactic Acid)

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Knowledge of the fundamental parameters of the poly(lactic acid) (PLA) molecular chain and resulting macroscopic properties is important for successful application of this polymer in different domains. Rheological data show that PLA has the typical properties of a linear and semi-stiff polymer chain. The stereochemical composition of the atactic polymer chain does not impact the rheological, mechanical, and barrier properties of PLA. Most commercial PLA grades contain a large majority of L-lactic acid units, in which case the polymer is named PLLA.PLLA at room temperature is a brittle glassy polymer and its main fracture mechanism is crazing. Above the glass transition, semicrystalline PLLA shows extensive cavitation. Uniaxial deformation above, but near, the glass transition temperature leads to the formation of a mesophase, responsible for strain hardening.At higher temperatures, strain hardening is caused by induced crystallization. The PLLA oxygen barrier properties are comparable to those of polystyrene (PS). The water vapor barrier properties are higher than those of PS because of the higher polarity of the polymer chain. An increase in barrier properties can be obtained by specific crystallization techniques, multilayer strategies, or the addition of (nano) fillers.

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“…For example, at high temperatures, crystalline PLA exhibits thermomechanical properties better than PLA in the amorphous state. Its softening point can be increased by using a nanofiller and producing a nanocomposite [ 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ]. Natural fibre reinforced composites are the focus of scientists, mainly due to the ability of natural fibres to replace synthetic materials (such as glass, carbon or aramid fibres), low cost and greater affinity for the polar polymer matrix.…”

Section: Introductionmentioning

confidence: 99%

The Impact of Filler Geometry on Polylactic Acid-Based Sustainable Polymer Composites

et al. 2020

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Recently, biocomposites have emerged as materials of great interest to the scientists and industry around the globe. Among various polymers, polylactic acid (PLA) is a popular matrix material with high potential for advanced applications. Various particulate materials and nanoparticles have been used as the filler in PLA based matrix. One of the extensively studied filler is cellulose. However, cellulose fibres, due to their hydrophilic nature, are difficult to blend with a hydrophobic polymer matrix. This leads to agglomeration and creates voids, reducing the mechanical strength of the resulting composite. Moreover, the role of the various forms of pure cellulose and its particle shape factors has not been analyzed in most of the current literature. Therefore, in this work, materials of various shapes and shape factors were selected as fillers for the production of polymer composites using Polylactic acid as a matrix to fill this knowledge gap. In particular, pure cellulose fibres (three types with different elongation coefficient) and two mineral nanocomponents: precipitated calcium carbonate and montmorillonite were used. The composites were prepared by a melt blending process using two different levels of fillers: 5% and 30%. Then, the analysis of their thermomechanical and physico-chemical properties was carried out. The obtained results were presented graphically and discussed in terms of their shape and degree of filling.

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Chemistry and Thermodynamic Properties of Lactic Acid and Lactide and Solvent Miscibility

Cited by 7 publications

References 14 publications

Plasticization of poly(lactide) by sorption of volatile organic compounds at low concentration

Plasticization of poly(lactide) by sorption of volatile organic compounds at low concentration

Rheology, Mechanical Properties, and Barrier Properties of Poly(lactic acid)

The Impact of Filler Geometry on Polylactic Acid-Based Sustainable Polymer Composites

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