Morphology, thermal properties and crystallization kinetics of ternary blends of the polylactide and starch biopolymers and nanoclay: The role of nanoclay hydrophobicity

Wokadala, Obiro Cuthbert; Ray, Suprakas Sinha; Bandyopadhyay, Jayita; Wesley-Smith, James; Emmambux, Mohammad Naushad

doi:10.1016/j.polymer.2015.06.058

Cited by 41 publications

(32 citation statements)

References 34 publications

(45 reference statements)

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“…Several criteria are prerequisites for appropriate utilization of the Avrami equation. Among the criteria are: no change in the sample volume during crystallization, a constant crystal growth rate, a unique crystal nucleation that is either thermal or athermal, and a constant crystal shape during growth . Irrespective of these several criteria, among others, the Avrami equation has been widely utilized for bulk crystallization analysis .…”

Section: Methodsmentioning

confidence: 99%

“…Among the criteria are: no change in the sample volume during crystallization, a constant crystal growth rate, a unique crystal nucleation that is either thermal or athermal, and a constant crystal shape during growth . Irrespective of these several criteria, among others, the Avrami equation has been widely utilized for bulk crystallization analysis . It was used in this study with an assumption that the conditions for its utilization are at least approximately met by the PLA/EAC blend systems.…”

Section: Methodsmentioning

confidence: 99%

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Isothermal crystallization kinetics and spherulite morphologies of poly(lactic acid)/ethylene acrylate copolymer blends

Taib

Tham

2017

J of Applied Polymer Sci

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Isothermal crystallization kinetics and spherulite morphologies of partially immiscible blends of poly(lactic acid) (PLA) and ethylene acrylate copolymer (EAC) were investigated by differential scanning calorimetry (DSC) and polarized optical microscopy. The DSC data obtained was analyzed using the Avrami equation. Crystallization kinetics of PLA from the melt was strongly influenced by the blend composition and the crystallization temperature. At a given crystallization temperature, the overall crystallization rate value was greater in the blends than in PLA suggesting that the presence of EAC enhanced crystallization of PLA. Polarized optical micrographs showed that the crystallization of PLA initially took place at the PLA/EAC interface. At high EAC content (>1 wt %), EAC domains acted as hindrance to crystallization reducing the overall crystallization rate of PLA in the blends. Based on the DSC analysis, the crystallization rate was maximum when PLA blend with 1 wt % EAC was isothermally crystallized at 103 °C. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45487.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Isothermal crystallization kinetics and spherulite morphologies of poly(lactic acid)/ethylene acrylate copolymer blends

Taib

Tham

2017

J of Applied Polymer Sci

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“…Esse aumento no espaçamen-to basal é um forte indício que a nanoargila está de forma intercalada na matriz do hidrogel, sendo que intercalações promovem a diminuição no ângulo 2θ e, consequentemente, o aumento do espaçamento basal. [29][30][31][32] Este aumento do espaçamento interlamelar pode estar atribuído à dimensão das cadeias poliméricas do hidrogel, que para os autores o hidrogel está alojando entre as plaquetas, expulsando os íons de sódio, como ilustrado na Figura 7.…”

Section: Difração De Raios-xunclassified

Otimização da síntese de hidrogéis nanocompósitos intercalados para possível aplicação na área médica

Fernandes¹,

Moura²,

Aouada³

2016

Quim. Nova

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. In this study, the hydrogel formulations based on polysaccharide sodium alginate were investigated for further development of intercalated nanocomposite hydrogels, for purposes of future applications in the areas of health as a carrier in drug delivery systems. Thus, the objective of the work dealt with in the optimization of hydrogels synthesis and obtaining nanostructured hydrogels with clay in an intercalated conformation. The optimization of the hydrogel synthesis was successful, and it is possible to define the materials and / or solutions to be used and concentrations of these solutions to the best formulations of hydrogels. The choice of the concentration of the polysaccharide, the type of crosslinking agent and nanofiller to continued development work, it was determined following criteria as the degree of swelling, and in some cases the physical properties, contributed to determine the best hydrogels. The development of intercalated nanocomposites hydrogel beads was confirmed by the X-ray diffraction technique, which thus could be used to observe evidence of effective incorporation or intercalation of the nanoclay in the hydrogel matrix.Keywords: hydrogels; nanocomposites; sodium alginate; nanofillers; intercalation. INTRODUÇÃOTendo em vista a necessidade de equipamentos sofisticados na área biomédica, os que são disponibilizados para utilização apresentam alto custo, sendo este um impasse no que diz respeito à aquisição. Deste modo, os biomateriais surgem como uma opção interessante, já que desde a última década vem se estudando e trabalhando com este tipo de material, principalmente na área médica. Existem diferentes maneiras de se definir o termo biomateriais. Dentre essas, os biomateriais são definidos como materiais utilizados na substituição de algum órgão vital que perdeu sua atividade no organismo. Atualmente o campo de aplicação engloba desde as próteses até a utilização para regeneração óssea. 1 Dentro da classe dos biomateriais, existem os polímeros, que são macromoléculas que se permitem serem moldadas de acordo com a área a ser empregada. 2 A utilização de polímeros está em ascendência, e se mostra altamente proveitoso na biomedicina principalmente quando se trata de polímeros naturais. A motivação está fundamentada nas propriedades como biodegradabilidade e biocompatibilidade. Dessa maneira, o alginato de sódio (sendo um polímero natural), em razão das propriedades já mencionadas e pelo fato de ser atóxico, termoestável e de baixo custo, vem recebendo grande atenção para tal finalidade. 3 O alginato de sódio é um polissacarídeo obtido por meio da extração de algas marrons (Phaeophyceae). As cadeias macromoleculares são lineares com segmento rígidos e flexíveis. 4 O segmento rígido é atribuído aos blocos G formado pelo monossacarídeo ácido α-L-gulurônico e o segmento flexível está associado aos blocos M que são constituídos de unidades monossacarídicas de ácido β-D-manurônico. 4 O alginato de sódio pode apresentar cadeias com apenas blocos M ou apenas blocos G, ou pode ser constituída por ...

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“…However, the thermal and mechanical properties of PBSA/butyl‐etherified high amylopectin starch (BWS) blends remained poor in comparison to those with butyl‐etherified high amylose starch (BHAS) (linear structures) . This was attributed to the immiscibility in polymer blends with low mixing entropy (Δ mixS) . Furthermore, the resulting properties of immiscible polymer blends are affected by their phase morphology depending on the processing conditions, molecular characteristics, and interfacial properties .…”

Section: Introductionmentioning

confidence: 99%

“…Researchers have previously studied the distribution of different commercially available nanoclays in starch/polyester blends processed through melt blending, in situ graft polymerization, and solution intercalation . Egri et al prepared poly(l‐lactic acid)‐g‐starch layered silicate nanocomposites in the presence of either stannous octoate (catalyst) or LA‐MMT organoclay (co‐catalyst‐nanofiller) and observed that the morphology and thermal properties of nanocomposites were highly reliant on the loading mass fraction of LA‐MMT within the nanocomposite structure.…”

Section: Introductionmentioning

confidence: 99%

Influence of Silica Size on Properties of Poly[(Butylene Succinate)‐Co‐Adipate]/Butyl‐Etherified High‐Amylose Starch Blend Composites

2017

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In this study, hydrophilic microsilica and nanosilica particles are dispersed in poly[(butylene succinate)‐co‐adipate]/butyl‐etherified high‐amylose starch (PBSA/BHAS) blends in order to stabilize the morphology by refining the droplet sizes of BHAS phase. The composites are prepared through melt processing in a batch mixer at varying screw speeds. Scanning and transmission electron microscopy studies confirmed the dispersion and localization of microsilica particles in the PBSA matrix and nanosilica particles in the dispersed BHAS phase. The increase in the screw speed promoted migration of some microsilica particles from the PBSA matrix to the dispersed BHAS phase, while nanosilica particles are mostly localized in the BHAS phase at both screw speeds. This led to changes in viscosity ratios that resulted in a variation in the morphology development. In conclusion, PBSA/BHAS blend composites containing both micro‐ and nanosilica particles are studied and a correlation between the silica particle sizes, localization, and the final properties was established.

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Morphology, thermal properties and crystallization kinetics of ternary blends of the polylactide and starch biopolymers and nanoclay: The role of nanoclay hydrophobicity

Cited by 41 publications

References 34 publications

Isothermal crystallization kinetics and spherulite morphologies of poly(lactic acid)/ethylene acrylate copolymer blends

Isothermal crystallization kinetics and spherulite morphologies of poly(lactic acid)/ethylene acrylate copolymer blends

Otimização da síntese de hidrogéis nanocompósitos intercalados para possível aplicação na área médica

Influence of Silica Size on Properties of Poly[(Butylene Succinate)‐Co‐Adipate]/Butyl‐Etherified High‐Amylose Starch Blend Composites

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