Green Composites with Cellulose Nanoreinforcements

Panaitescu, Denis Mihaela; Frone, Adriana Nicoleta; Chiulan, Ioana

doi:10.1002/9781119441632.ch134

Cited by 3 publications

(4 citation statements)

References 147 publications

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“…PLA properties are strongly influenced by even small amounts of enantiomeric impurities. Pure poly( l -lactic acid) (PLLA) or poly( d -lactic acid) are semicrystalline polymers with a glass transition temperature ( T g ) around 57 °C and a melting temperature of about 175 °C while PLA with a content of 50–93% l -lactic acid is completely amorphous [ 24 ]. Generally, amorphous grades have better processability and wider processing window than the crystalline grades [ 25 ] but much lower mechanical properties ( Table 1 ).…”

Section: Aliphatic Polyesters For Additive Manufacturingmentioning

confidence: 99%

“…Short-chain-length PHA contain 3–5 carbon atoms and show high stiffness and brittleness in relation to their high crystallinity (50–80%) [ 24 ]. Poly(3-hydroxybutyrate) (PHB) ( Figure 3 b) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) are by far the most studied of PHA and are commercially available.…”

Section: Aliphatic Polyesters For Additive Manufacturingmentioning

confidence: 99%

“…However, its brittleness and small processing window limits its applications. PHBV, obtained by copolymerization with hydroxyvalerate (HV), is a more ductile material, with lower melting point and decreased strength and stiffness [ 24 , 59 ]. The properties of PHB or PHBV strongly depend on the processing conditions and composition ( Table 2 ).…”

Section: Aliphatic Polyesters For Additive Manufacturingmentioning

confidence: 99%

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Recent Advances in 3D Printing of Aliphatic Polyesters

Chiulan

Frone

Brandabur³

et al. 2017

Bioengineering

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136

121

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3D printing represents a valuable alternative to traditional processing methods, clearly demonstrated by the promising results obtained in the manufacture of various products, such as scaffolds for regenerative medicine, artificial tissues and organs, electronics, components for the automotive industry, art objects and so on. This revolutionary technique showed unique capabilities for fabricating complex structures, with precisely controlled physical characteristics, facile tunable mechanical properties, biological functionality and easily customizable architecture. In this paper, we provide an overview of the main 3D-printing technologies currently employed in the case of poly (lactic acid) (PLA) and polyhydroxyalkanoates (PHA), two of the most important classes of thermoplastic aliphatic polyesters. Moreover, a short presentation of the main 3D-printing methods is briefly discussed. Both PLA and PHA, in the form of filaments or powder, proved to be suitable for the fabrication of artificial tissue or scaffolds for bone regeneration. The processability of PLA and PHB blends and composites fabricated through different 3D-printing techniques, their final characteristics and targeted applications in bioengineering are thoroughly reviewed.

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Section: Aliphatic Polyesters For Additive Manufacturingmentioning

confidence: 99%

Section: Aliphatic Polyesters For Additive Manufacturingmentioning

confidence: 99%

Section: Aliphatic Polyesters For Additive Manufacturingmentioning

confidence: 99%

See 1 more Smart Citation

Recent Advances in 3D Printing of Aliphatic Polyesters

Chiulan

Frone

Brandabur³

et al. 2017

Bioengineering

Self Cite

136

121

View full text Add to dashboard Cite

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“…Moreover, the use of fillers as nucleating actors in both polyurethane foam insulation and other thermoset materials has been widely studied in the literature. For instance, it has been shown that the use of fillers in polyurethane foam leads to smaller cells, which has a considerable impact on the material's properties (Zhou et al 2016a;Panaitescu et al 2017;Członka et al 2020;Bradai et al 2022;Dukarska et al 2022).…”

Section: Introductionmentioning

confidence: 99%

Investigation of cellulose filaments as filler in rigid insulating polyurethane foam

Beaufils-Marquet

Blanchet

Hussain

et al. 2023

BioRes

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Cellulose is a biopolymer that has broad potential applications including in building insulation, and it was studied for its potential as a filler material. A closed-cell polyurethane foam insulation formulation was developed, and cellulose filaments (CFs) were introduced at varying percentages. The viscosity and morphology of the formulations were studied, as were different foam properties, such as water vapor permeability, reaction kinetics, density, porosity, thermal conductivity, and compressive strength foams as a function of cellulose filaments content. A commercial foam was also tested as a reference. The cellulose filaments impacted the formulations’ viscosity, and all the properties of the resulting insulating material. For example, samples containing 5% of cellulose filaments were found to perform differently than samples containing 0%, 1% and 2.5% mainly due to agglomerate formation, which impacted cell size (about 0.1 mm2 at 0%, 1% and 2.5% versus a mean of over 0.4 mm2 at 5%), and differential vapor sorption (with a mass change of 2%wt at 0 parts per hundred of polyol versus 2.5%wt at 5% from 0% to 95% relative humidity). However, the required performances by the standards of polyurethane foam insulation material were always fulfilled regardless of the amount of cellulose filaments present.

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