Synthesis and characterization of biodegradable poly(l-lactide)/layered double hydroxide nanocomposites

Gonçalves, Núria Ângelo; Caio, Telma Regina Nogueira; Moraes, Samara Boaventura de; Lona, Liliane Maria Ferrareso

doi:10.1007/s00289-014-1184-4

Cited by 10 publications

(7 citation statements)

References 28 publications

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“…Some studies have emerged around the pulp and paper industry. Applications that involve packaging materials [13][14][15], bleaching [16], filler formulation [17] and lignin depolymerization [18] are being devised. Many of these research fields require material scientists to expand the LDH structure beyond the simple hydrotalcite (HT) that is comprised of Mg 2+ and Al 3+ hydroxides and CO…”

Section: Introductionmentioning

confidence: 99%

In Situ Hybridization of Pulp Fibers Using Mg-Al Layered Double Hydroxides

Lange

Lastusaari

Reza

et al. 2015

Fibers

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Inorganic Mg2+ and Al 3+ containing layered double hydroxide (LDH) particles were synthesised in situ from aqueous solution onto chemical pulp fibers of pine (Pinus sylvestris). High super saturated (hss) solution with sodium carbonate produced LDH particles with an average diameter of 100-200 nm. Nano-size (70 nm) LDH particles were found from fibers external surface and, to a lesser degree, from the S2 cell wall after synthesis via low super saturated (lss) route. The synthesis via slow urea hydrolysis (Uhyd) yielded micron and clay sized LDH (2-5 µm) and enabled efficient fiber densification via mineralization of S2 fiber wall layer as indicated by TEM and compliance analysis. The Uhyd method decreased fiber compliance up to 50%. Reduction in the polymerisation degree of cellulose was observed with capillary viscometry. Thermogravimetric analysis showed that the hybridization with LDH reduced the exothermic heat, indicating, that this material can be incorporated in flame retardant applications. Fiber charge was assessed by

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Section: Introductionmentioning

confidence: 99%

In Situ Hybridization of Pulp Fibers Using Mg-Al Layered Double Hydroxides

Lange

Lastusaari

Reza

et al. 2015

Fibers

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“…However, previous studies about the properties of LDHs/PLA nanocomposites were mostly confined to thermal and mechanical properties, and little on the gas barrier properties and antibacterial activity. Gonçalves reported the investigation of intercalated CaAl-LDHs/PLA nanocomposites [13]. It was revealed that the thermal stability and UV barrier properties of PLA nanocomposites were higher than those of pure PLA.…”

Section: Introductionmentioning

confidence: 99%

Efficient Gas Barrier and Antibacterial Properties of Poly(lactic acid) Nanocomposites: Functionalization with Phytic Acid–Cu(II) Loaded Layered Clay

2020

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Poly(lactic acid) (PLA) represents one of the most promising and attractive bio-based polymers for green packaging. However, toughness, gas barrier and antibacterial properties of pure PLA films cannot compete with those of traditional petroleum-based active packaging plastics. To fill this gap, utilization of excellent chelating properties of phytic acid (PA), functionalized layered double hydroxides (LDHs@PA-Cu(II)) was firstly synthetized via facile deposition and chelation of one-step assembled PA-Cu(II) coordination compounds on the surface of layered clay. Furthermore, LDHs@PA-Cu(II)/PLA nanocomposites were prepared by blending LDHs@PA-Cu(II) and pure PLA via solution casting evaporation process. After adding only 1 wt % LDHs@PA-Cu(II), elongation at break and tensile strength increase by 53.0% and 18.9%, respectively, and the oxygen relative permeability decreases by 28.0%. Due to the strong interface interaction and heterogenous nucleation, the reinforcement effect of LDHs@PA-Cu(II) at low loadings is remarkable. Meanwhile, owing to the antibacterial activity of PA-Cu(II) coatings, the antibacterial rate (against Escherichia coli) of LDHs@PA-Cu(II) exceeds 99.99%. Furthermore, the corresponding LDHs@PA-Cu(II)/PLA nanocomposites also show outstanding antibacterial properties, which will be a promising candidate for active packaging application.

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“…Na literatura, observa-se que a inserção de HDL na matriz de PLLA pode apresentar melhora significativa nas propriedades térmicas e/ou mecânicas do polímero. Também é relatado que a síntese do PLLCL resulta em um material com melhores propriedades mecânicas (GONÇALVES et al, 2014;FERNANDEZ et al, 2012;KATIYAR et al, 2010;MAHBOOBEH et al, 2010;CHIANG e WU, 2010;DAGNON et al, 2009;COHN e SALOMON, 2005).…”

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“…Nestas reações, na primeira etapa ocorre a formação de um dímero linear (ácido Lactoil-lactídeo) e, continuando a condensação, há a formação de mais oligômeros e do dímero cíclico (lactídeo -LA), que pode ser formado pela esterificação intramolecular do ácido láctico ou pela decomposição de oligômeros superiores (Fig. 2) (GROOT et al, 2010).…”

Section: Revisão Bibliográficaunclassified

“…Os nanocompósitos com cargas inorgânicas têm apresentado propriedades significativamente melhores que os polímeros puros. Dentre essas melhoras, as mais importantes são obtidas em relação às propriedades mecânicas, térmicas, retardância à chama e de barreira (GONÇALVES, et al, 2014;DAGNON et al, 2009;SOUZA et al, 2006).…”

Section: Propriedades E Aplicações Dos Nanocompósitos Poliméricosunclassified

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Síntese e caracterização de nanocompósitos de poli(L-lactídeo-co-epsilon-caprolactona)/hidróxido duplo lamelar

Gonçalves¹

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Synthesis and characterization of biodegradable poly(l-lactide)/layered double hydroxide nanocomposites

Cited by 10 publications

References 28 publications

In Situ Hybridization of Pulp Fibers Using Mg-Al Layered Double Hydroxides

In Situ Hybridization of Pulp Fibers Using Mg-Al Layered Double Hydroxides

Efficient Gas Barrier and Antibacterial Properties of Poly(lactic acid) Nanocomposites: Functionalization with Phytic Acid–Cu(II) Loaded Layered Clay

Síntese e caracterização de nanocompósitos de poli(L-lactídeo-co-epsilon-caprolactona)/hidróxido duplo lamelar

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