Chemical foaming extrusion of poly(lactic acid) with chain-extenders: Physical and morphological characterizations

Julien, J.M.; Quantin, Jean-Christophe; Bénézet, Jean‐Charles; Bergeret, Anne; Lacrampe, Marie‐France; Krawczak, Patricia

doi:10.1016/j.eurpolymj.2015.03.011

Cited by 39 publications

(25 citation statements)

References 43 publications

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“…This is mainly due to PLA's low melt strength. The recent research to overcome this drawback to facility PLA foaming process includes introducing chain extender 14,15 for branching structure, changing the L/D ratio conguration, 16 varying PLA's molecular weight, 17 compounding with different types of additives, 18,19 blending with other polymers having a higher crystallization rate, 20 and controlling the gas contents. 21 For example, PLA foam morphology can be greatly controlled by adding second component into the PLA matrix, which leads to increasing of cell density because of the promoted cell nuclei.…”

Section: Introductionmentioning

confidence: 99%

Introduction of stereocomplex crystallites of PLA for the solid and microcellular poly(lactide)/poly(butylene adipate-co-terephthalate) blends

et al. 2018

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Section: Introductionmentioning

confidence: 99%

Introduction of stereocomplex crystallites of PLA for the solid and microcellular poly(lactide)/poly(butylene adipate-co-terephthalate) blends

et al. 2018

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“…In addition, the PLA foams with ENR exhibit low T cc values in second heating DSC scans as compared with the neat PLA foams. This result may be due to the fast nucleation process induced by ENR [24][25][26] .…”

Section: The Effect Of Enr-50 Content On Crystallinity Of Pla/enr-50 mentioning

confidence: 99%

Polylactic acid/epoxidized natural rubber biofoams: modelling and water absorption

Puttajan¹,

Nampitch²

2019

ScienceAsia

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Biofoams containing polylactic acid (PLA) and an epoxidized natural rubber (ENR-50) were prepared using various chemical foaming agents (CFA). The factors that affect the properties and characteristics of the biodegradable foams were epoxidized natural rubber (ENR)-50 and CFA contents. ENR-50 is one of the toughening agents used for blending with PLA by twin-screw extruder followed by compression moulding. Water absorption increased with increasing ENR-50 and CFA contents, due to the effect of polarity and natural hydrophilicity of the oxirane groups of ENR-50. The percentage crystallinity decreased with the addition of ENR-50 and CFA, due to the interaction between the epoxy groups of the ENR-50 and the carbonyl groups of the PLA, which makes movement more difficult and hinders the arrangement of the crystal. The addition of ENR in blend foam led to the increase of impact strength. Whereas the flexural strength of PLA/ENR foams decreased with increased ENR content. The impact strength and flexural strength of PLA/ENR-50 foams were investigated and the experimental data were analysed through SPSS and MATLAB, to optimize as well as to determine the significance of the factors affecting the impact strength and flexural strength of the foams. The parameterization of the mathematical method for different content of the initial controlled substance was achieved by fitting the mathematical model with the experimental data for impact strength and flexural strength. The 3-D curves obtained from the proposed mathematical models were plotted.

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“…However, it is still a challenge to prepare PLA/wood flour composite foams because of the low melt strength of PLA matrix. The melt strength of PLA can be improved by increasing the molecular weight and modifying the linear molecular structure of PLA through in situ ultraviolet-induced chain branching [ 41 ] and the incorporation of the chain extender [ 2 , 20 , 23 , 24 , 25 , 26 , 27 , 42 , 43 , 44 , 45 , 46 ]. In contrast, chain extender is more efficacious, and low chain extender content is needed for chain branching.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Desirable Porous Cell Structure Polylactide/Wood Flour Composite Foams Assisted by Chain Extender

Wang

Song

et al. 2017

Materials

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Polylactide (PLA)/wood flour composite foam were prepared through a batch foaming process. The effect of the chain extender on the crystallization behavior and dynamic rheological properties of the PLA/wood flour composites were investigated as well as the crystal structure and cell morphology of the composite foams. The incorporation of the chain extender enhanced the complex viscosity and storage modulus of PLA/wood flour composites, indicating the improved melt elasticity. The chain extender also led to a decreased crystallization rate and final crystallinity of PLA/wood flour composites. With an increasing chain extender content, a finer and more uniform cell structure was formed, and the expansion ratio of PLA/wood flour composite foams was much higher than without the chain extender. Compared to the unfoamed composites, the crystallinity of the foamed PLA/wood flour composites was improved and the crystal was loosely packed. However, the new crystalline form was not evident.

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Chemical foaming extrusion of poly(lactic acid) with chain-extenders: Physical and morphological characterizations

Cited by 39 publications

References 43 publications

Introduction of stereocomplex crystallites of PLA for the solid and microcellular poly(lactide)/poly(butylene adipate-co-terephthalate) blends

Introduction of stereocomplex crystallites of PLA for the solid and microcellular poly(lactide)/poly(butylene adipate-co-terephthalate) blends

Polylactic acid/epoxidized natural rubber biofoams: modelling and water absorption

Preparation of Desirable Porous Cell Structure Polylactide/Wood Flour Composite Foams Assisted by Chain Extender

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