Thermogravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC) of PLA/Cellulose Composites

Nurazzi, N. M.; Abdullah, N.; Norrrahim, Mohd Nor Faiz; Kamarudin, Siti Hasnah; Ahmad, S.; Shazleen, S. S.; Rayung, M.; Asyraf, M.R. Mohd; Ilyas, R. A.; Kuzmin, M.

doi:10.1201/9781003160458-7

Cited by 8 publications

(4 citation statements)

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“…18 Some works reported promising results, in terms of improving mechanical properties and increasing tensile strength, by introducing lignocellulosic reinforcements with a high cellulose content in a PLA matrix. 24 Norizan et al (2022) 25 studied the thermal properties of PLA/cellulose composites, concluding that cellulose acts as a nucleation agent, increasing the crystallisation rate and improving the thermal properties of the composite material. However, no study has been found that has focused specifically on the incorporation of olive pruning wood residues with a high cellulose content into polymer matrices.…”

Section: Introductionmentioning

confidence: 99%

Manufacture and characterisation of polylactic acid biocomposites with high-purity cellulose isolated from olive pruning waste

Rodríguez-Liébana

Navas‐Martos

Jurado-Contreras

et al. 2023

Journal of Reinforced Plastics and Composites

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A two-step chemical process was carried out on olive pruning residues according to an optimised sequence that led to the isolation of natural fibre with a high cellulose content. Reaction time, temperature and HNO3 concentration in the acid hydrolysis stage were optimised by means of the Response Surface Methodology to achieve the highest removal of hemicellulose and lignin and the highest crystallinity index, minimising cellulose hydrolysis. Subsequent hydrolysis with NaOH allowed to obtain a pulp enriched in cellulose (83.28 wt.%). Analysis revealed that the cellulose isolated had a high crystallinity index (70.06%) and thermal stability ( T max = 357°C). The cellulose obtained was finally used for the manufacture of polymer biocomposites and to evaluate its viability as a filler for polymeric materials. The selected polymer matrix used was polylactic acid (PLA) and the amount of filler was 5 and 15% by weight, respectively. In general, the fibres did not improve the mechanical properties of PLA, and maintained unchanged its melting temperature. Microscopic analysis revealed that PLA/fibre adhesion was stronger for treated fibres. Contradictorily, the composites with untreated fibres presented slightly higher thermal stability. Water uptake increased with the concentration of fibres, being higher in those materials with untreated fibre.

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Section: Introductionmentioning

confidence: 99%

Manufacture and characterisation of polylactic acid biocomposites with high-purity cellulose isolated from olive pruning waste

Rodríguez-Liébana

Navas‐Martos

Jurado-Contreras

et al. 2023

Journal of Reinforced Plastics and Composites

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“…The curves have shown almost similar trends indicating a glass transition T g , followed by the polymer cold crystallization T c and the polymer melting T m . These three thermal events are typical for semicrystalline PLA . The DSC data are reported in Table S1 in the Supporting Information.…”

Section: Resultsmentioning

confidence: 94%

“…These three thermal events are typical for semicrystalline PLA. 36 The DSC data are reported in Table S1 in the Supporting Information. The glass-transition temperature T g , which was determined as the endothermic inflection point on the DSC curve corresponding to the transition from the glass to the rubbery state, was observed at 332 K. The exothermic peak at around 380 K is attributed to the crystallization of the polymer at this temperature.…”

Section: Resultsmentioning

confidence: 99%

Correlation between Mechanical and Dielectric Dynamic Behavior Using Fractional Models: Application to Polylactic Acid

Fakraoui,

Arous,

Royaud

et al. 2024

ACS Appl. Polym. Mater.

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The complementarity between mechanical and dielectric properties is crucial, as it facilitates a comprehensive understanding of material behavior, enabling optimal using. This work mainly focuses on the use of broadband dielectric spectroscopy (BDS) and dynamic mechanical analysis (DMA) to investigate the electrical and mechanical aspects of polymer relaxation phenomena. We have opted to conduct experiments on polylactic acid (PLA) due to its well-known use in various applications, attributed to its notable properties and essential relaxation processes. Differential scanning calorimetry (DSC) was used to identify characteristic temperatures for distinguishing different relaxation processes in the polymer. The obtained experimental results were analyzed using the mechanical fractional model (MFM) and the dielectric fractional model (DFM). The fractional model parameters confirm that higher temperatures correlate with increased molecular mobility within macromolecular chains, especially in relaxation processes associated with the glass transition. Subsequently, a fractional calculus approach is employed to investigate the correlation between the complex modulus and complex permittivity of PLA. This correlation model enables the prediction of the real permittivity ε′(T) curve from the real modulus E′(T) data, providing valuable insights into PLA behavior. These results suggest that the correlation model has the potential to predict the dielectric behavior of a polymer based on its mechanical results and vice versa.

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“…Thermal analysis such as thermogravimetry (TGA) has been widely used for the characterization of polymeric materials, since it monitors physical modifications of chitosan polymer matrix, composites, etc. [27][28][29]. Indeed, during the processing (packaging process) of coated materials, certain processes can seriously damage the polymer matrix.…”

Section: Introductionmentioning

confidence: 99%

Chitosan-Coated Packaging Papers—Strength and Thermal Stability

et al. 2023

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The aging of paper depends on various factors, including environmental conditions, microbiological factors and chemical composition. Chitosan-coated paper is an eco-friendly material that has potential use in various packaging applications due to its mechanical, barrier and antibacterial properties. In this study, the aging stability of chitosan-coated wood-free wrapping paper was evaluated by examining pulp and four paper samples with different quantities of chitosan. Accelerated thermal aging and dynamic thermogravimetric analysis were used to assess the aging stability, while color changes were examined to understand the impact of chitosan coating. The study found that increasing chitosan coating led to improved aging stability due to the improved crosslinking process between chitosan and paper. The coated paper samples displayed a yellowish hue after 72 h of aging, with increased strength and resistance to weight loss. TGA results indicated that the temperature of complete burning of the sample increased with increasing chitosan coating. Additionally, coated paper samples exhibited a more even surface and improved barrier properties. Overall, chitosan-coated paper is a promising material for sustainable and eco-friendly packaging, printing and wrapping applications. This study’s findings have important implications for the development of environmentally-friendly packaging materials that possess desirable mechanical and barrier properties.

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Thermogravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC) of PLA/Cellulose Composites

Cited by 8 publications

References 0 publications

Manufacture and characterisation of polylactic acid biocomposites with high-purity cellulose isolated from olive pruning waste

Manufacture and characterisation of polylactic acid biocomposites with high-purity cellulose isolated from olive pruning waste

Correlation between Mechanical and Dielectric Dynamic Behavior Using Fractional Models: Application to Polylactic Acid

Chitosan-Coated Packaging Papers—Strength and Thermal Stability

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