Thermal and Crystallization Behavior of PLA/PLLA-Grafting Cellulose Nanocrystal

Inácio, Erika M.; Souza, D.H.S.; Dias, Marcos L.

doi:10.4236/msa.2020.111004

Cited by 10 publications

(10 citation statements)

References 18 publications

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“…All these are representative peaks of the α-form crystals, indicating that PLA has the typical orthorhombic crystal structure. Similar peaks have been reported in the literature for PLA [64,65].…”

Section: Quantification Of the Active Ingredinets In The Pla Matrix And Characterization Of The Chemical Structure Of The Composites Prepsupporting

confidence: 90%

“…The crystal structure and morphology of the semi-crystalline polyester PLA have been extensively investigated in the literature using many techniques [64,65]. X-ray diffraction is one of the most accurate and representative techniques.…”

Section: Quantification Of the Active Ingredinets In The Pla Matrix And Characterization Of The Chemical Structure Of The Composites Prepmentioning

confidence: 99%

See 1 more Smart Citation

Development of Bio-Composites with Enhanced Antioxidant Activity Based on Poly(lactic acid) with Thymol, Carvacrol, Limonene, or Cinnamaldehyde for Active Food Packaging

et al. 2021

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The new trend in food packaging films is to use biodegradable or bio-based polymers, such as poly(lactic acid), PLA with additives such as thymol, carvacrol, limonene or cinnamaldehyde coming from natural resources (i.e., thyme, oregano, citrus fruits and cinnamon) in order to extent foodstuff shelf-life and improve consumers’ safety. Single, triple and quadruple blends of these active compounds in PLA were prepared and studied using the solvent-casting technique. The successful incorporation of the active ingredients into the polymer matrix was verified by FTIR spectroscopy. XRD and DSC data revealed that the crystallinity of PLA was not significantly affected. However, the Tg of the polymer decreased, verifying the plasticization effect of all additives. Multicomponent mixtures resulted in more intense plasticization. Cinnamaldehyde was found to play a catalytic role in the thermal degradation of PLA shifting curves to slightly lower temperatures. Release of thymol or carvacrol from the composites takes place at low rates at temperatures below 100 °C. A combined diffusion-model was found to simulate the experimental release profiles very well. Higher antioxidant activity was noticed when carvacrol was added, followed by thymol and then cinnamaldehyde and limonene. From the triple-component composites, higher antioxidant activity measured in the materials with thymol, carvacrol and cinnamaldehyde.

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Section: Quantification Of the Active Ingredinets In The Pla Matrix And Characterization Of The Chemical Structure Of The Composites Prepsupporting

confidence: 90%

Section: Quantification Of the Active Ingredinets In The Pla Matrix And Characterization Of The Chemical Structure Of The Composites Prepmentioning

confidence: 99%

Development of Bio-Composites with Enhanced Antioxidant Activity Based on Poly(lactic acid) with Thymol, Carvacrol, Limonene, or Cinnamaldehyde for Active Food Packaging

et al. 2021

View full text Add to dashboard Cite

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“…This observation agrees with the higher degree of crystallinity reported from DSC experiments. When comparing the diffraction peaks located at 2θ = 16.6° and 2θ = 19.0° for PLA1Bz-g-CNF with respect to other materials, a slight shift towards higher 2θ values is observed, attributed to the effect of the grafting on the crystallization of PLA, confirming the success of the grafting reaction already reported from spectroscopic and thermal analysis (Yu et al 2008;Inácio et al 2020).…”

Section: X-ray Diffraction (Xrd) Analysissupporting

confidence: 82%

Graft modification in bamboo cellulose nanofibrils: An effective option to improve compatibility and tunable surface energy

Rodríguez-Ramírez¹,

Dufresne

D’Accorso

et al. 2021

Preprint

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In this work, from an endemic and non-significant value-added bamboo argentine, nanofibrils (CNFs) of 20 nm in width were obtained. These nanofibrils were chemical modified in surface with three simple steps using a noncommercial low molecular weight polylactic acid. The success of modification was confirmed by FTIR, TGA, DSC and XRD analysis. The modified nanofibrils were taken up for changing surface properties in films based on commercial PLA. The results show that dispersive (γ D/S) component of films increase of 34.7 mN/m to 36.1 mN/m after the addition of modified nanofibrils from 2 to 5% in formulation of the films, comparing with a physical blend. Interesting others result in physical, mechanical, and thermal properties of the nanocomposites, were reported.

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“…Tables and present the studies reporting CNCs with the 50 highest and 50 lowest thermal stabilities ( T onset values), respectively, along with the critical parameters of each material, such as type, source, reaction conditions, post-treatment, and drying method. For a comprehensive list of all 512 reviewed cellulose nanomaterials from 187 publications, including their T onset and critical parameters, see Table S1 (refs , , − , , , , , , , , , , − , , , , , , , , , − , − , and − …”

Section: Discussionmentioning

confidence: 99%

Thermal Stability of Cellulose Nanomaterials

2023

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Thermal stability is a crucial property of materials, especially when they have a wide range of thermally sensitive applications. Cellulose nanomaterials (CNMs) extracted from cellulosic biomass have garnered significant attention due to their abundance, biodegradability, sustainability, production scalability, and industrial versatility. To explore the correlation between the structure, chemistry, and morphology of CNMs and their thermal stability, we present a comprehensive literature review. We identify five major factors affecting CNMs’ thermal stability, namely type, source, reaction conditions, post-treatment, and drying method, and analyze their impact on CNMs’ thermal stability using several case studies from the literature. Using multiple linear least-squares regression (MLR), we establish a quantitative relationship between thermal stability and seven variables: crystallinity index of the source, dissociation constant of the reactant used, reactant concentration, reaction temperature, reaction time, evaporation rate, and post-treatment presence. By understanding these interdependencies, our statistical analysis enables the design of CNMs with predictable thermal properties and identification of optimal conditions for achieving high thermal stability. The results of our study provide crucial insights that can guide the development of CNMs with enhanced thermal stability for use in a variety of industrial applications.

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Thermal and Crystallization Behavior of PLA/PLLA-Grafting Cellulose Nanocrystal

Cited by 10 publications

References 18 publications

Development of Bio-Composites with Enhanced Antioxidant Activity Based on Poly(lactic acid) with Thymol, Carvacrol, Limonene, or Cinnamaldehyde for Active Food Packaging

Development of Bio-Composites with Enhanced Antioxidant Activity Based on Poly(lactic acid) with Thymol, Carvacrol, Limonene, or Cinnamaldehyde for Active Food Packaging

Graft modification in bamboo cellulose nanofibrils: An effective option to improve compatibility and tunable surface energy

Thermal Stability of Cellulose Nanomaterials

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