Effect of thermal annealing and filler ball-milling on the properties of highly filled polylactic acid/pecan nutshell biocomposites

Agustin-Salazar, Sarai; Ricciulli, Marco; Ambrogi, Veronica; Cerruti, Pierfrancesco; Scarinzi, Gennaro

doi:10.1016/j.ijbiomac.2021.12.101

Cited by 13 publications

(33 citation statements)

References 61 publications

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“…Nevertheless, pores often appear for PLA/AbE, just like embedded and exposed spherical particles that can be related to the amber extract. The pores and exposed spherical particles in PLA blends and composites are commonly associated with there being no adhesion between the dispersed phase and the matrix using different mixing methodologies 23,31,32 . However, Figure 3E shows AbE after being solved in 1,4‐dioxane and freeze‐dried without any third component.…”

Section: Resultsmentioning

confidence: 99%

“…It is based on the polymer cold crystallization ability to enhance the crystallinity degree during the heating of the material in temperatures between glass transition and melting. The temperature and time are critical parameters for reaching an organized structure based on different crystalline forms 18,20–24 …”

Section: Introductionmentioning

confidence: 99%

“…The films' stability was assessed through thermal and mechanical resistance, UV–visible light transmission, swelling test, and water contact angle. The choice of a 1% extract is based on the literature results, in which natural extracts such as a nucleating agent, 23 plasticizers, 26 pro and antioxidants, 27 thermal and mechanical reinforcements, 21 and more were used in the polymeric chain of poly(lactic acid).…”

Section: Introductionmentioning

confidence: 99%

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Amber extract as a bio‐additive to poly(lactic acid) films: Multimethod analysis of crystallinity and stability

dos Santos,

Ujčić,

Sobótka

et al. 2023

Vinyl Additive Technology

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Poly(lactic acid) (PLA) films with 1 wt% of amber extract (AbE) as a bio‐additive were obtained through solvent mixing using 1,4‐dioxane, which was later evaporated. The extract, derived from the residual amber generated during jewelry manufacturing in the Gdansk region (Poland), was evaluated for its morphology and thermal response. The resulting films were transparent, and the addition of AbE imparted a yellow hue. The crystallinity characteristics of the PLA/AbE films were analyzed through FTIR, DSC, POM, and XRD results. The cold crystallization ability of PLA in the presence of AbE was assessed by comparing the films with their annealed counterparts. The annealed films demonstrated a slight increase in the crystalline phase without any change in transparency. The presence of amber extract particles impeded the formation of stable polymorph crystals within the PLA structure, leading to an expanded size distribution of spherulites and a reduced crystallization rate. Furthermore, the addition of AbE showed promise in enhancing the UV–vis blocking of PLA, as AbE particles decreased the transmission rate across the entire UV–vis spectrum.Highlights PLA thin films with 1% AbE were produced by the casting method. Amber extract from isopropanol fraction has a porous structure. PLA and amber extract exhibit homogeneous mixing in 1,4‐dioxane solution. The AbE particles improved the UV–vis blocking of PLA.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Amber extract as a bio‐additive to poly(lactic acid) films: Multimethod analysis of crystallinity and stability

dos Santos,

Ujčić,

Sobótka

et al. 2023

Vinyl Additive Technology

View full text Add to dashboard Cite

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“…Petro-plastics are among the main materials used in the preparation of products with a short lifespan, particularly in the packaging industry [ 1 , 2 ]. This generates a large amount of plastic waste, which has been causing global environmental problems for decades [ 3 , 4 , 5 , 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

“…Recycling, incineration, and landfilling are the current methods for managing plastic waste [ 1 ]. However, these steps are often limited by some issues related to the high cost of the process, the low cost of recycled plastics, the low cost of raw materials limiting plastic recycling, and the production of greenhouse gases and other irritant gases [ 3 , 4 ].…”

Section: Introductionmentioning

confidence: 99%

Thermal, Morphological and Mechanical Properties of a BioPE Matrix Composite: Case of Shell, Pulp, and Argan Cake as Biofillers

et al. 2023

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Extrusion and hot compressing molding processes were used to create bio-polyethylene (BioPE) composites reinforced with argan byproducts (shell, pulp, and argan cake) as bio-fillers. The thermal stability of the composites wass analyzed by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). Dynamical mechanical analysis and rheological testing were used to investigate their mechanical properties. The morphological results showed a good adhesion between the argan and BioPE matrix. More efficient mechanical properties have been distinguished in the case of argan byproduct-based composite. A higher Young’s modulus was noted for all the biocomposites compared to pure BioPE. Thermal analysis revealed that the addition of bio-filler to polymer reduced decomposition temperatures. This study provides an ecological alternative for upgrading the valorization of abundant and underutilized Moroccan biomass. Furthermore, the possibility of using argan byproducts in composite manufacturing will help open up new markets for what is currently considered waste.

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A strategy to prepare high‐robust and ultra‐tough polylactic acid/polycaprolactone/talc composites with thermo‐resistance

Xia,

Qian,

et al. 2023

Polymer Composites

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Blending with ductile polycaprolactone (PCL) is one of the common toughening methods for polylactic acid (PLA). However, it seems inevitable to experience a trade‐off in mechanical strength and thermal stability of PLA. Therefore, this study aimed to improve the mechanical and thermal properties of PLA/PCL blends by adding different contents of talc (0–10 wt%) and conducting annealing treatments. Interestingly, the maximum tensile strength (52.04 MPa), elongation at break (83.51%), and impact strength (6.05 kJ/m2) were achieved by incorporating 2.5 wt% talc into the blends without annealing. Meanwhile, the addition of just 1 wt% talc shortened the semi‐crystallization time of PLA to one‐third of the neat PLA at 100°C. Particularly, after annealing treatment, the crystallinity of PLA increased to 32.1%, and the Vicat softening temperature reached as high as 133.3°C with 2.5 wt% talc. Importantly, the increase in crystallinity did not compromise the toughness of PLA composites but significantly enhanced the impact strength to 8.91 kJ/m2. This study provides an updated understanding of the relationship between toughness and crystallinity in PLA composites.Highlights Thermo‐resistance of polylactic acid (PLA) composite increases to 133.3°C. Talc aids nucleation and promotes PLA crystallization. Increased crystallinity and high toughness are simultaneously realized. Adding 1 wt% talc reduced PLA semi‐crystallization time by one‐third. Crystal transformation and sea‐islands structure are vital for reinforcements.

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Effect of thermal annealing and filler ball-milling on the properties of highly filled polylactic acid/pecan nutshell biocomposites

Cited by 13 publications

References 61 publications

Amber extract as a bio‐additive to poly(lactic acid) films: Multimethod analysis of crystallinity and stability

Amber extract as a bio‐additive to poly(lactic acid) films: Multimethod analysis of crystallinity and stability

Thermal, Morphological and Mechanical Properties of a BioPE Matrix Composite: Case of Shell, Pulp, and Argan Cake as Biofillers

A strategy to prepare high‐robust and ultra‐tough polylactic acid/polycaprolactone/talc composites with thermo‐resistance

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