Morphological and structural characterization of PHBV/organoclay nanocomposites by small angle X-ray scattering

Carli, Larissa N.; Bianchi, Otávio; Machado, Giovanna; Crespo, Janaína da Silva; Mauler, Raquel Santos

doi:10.1016/j.msec.2012.11.023

Cited by 25 publications

(28 citation statements)

References 40 publications

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“…If CNs are well dispersed in the polymer matrix usually they act as nuclei sites reducing the free energy needed for the formation of a critical nucleus. Then, the agglomeration of the particles decreases the nucleation sites and then the crystallization starts at lower temperatures .…”

Section: Resultsmentioning

confidence: 99%

Novel biodegradable composites based on PHBV: Effect of nanocellulose incorporation on the non‐isothermal crystallization kinetic and structural parameters

Benini¹,

Ornaghi

Bianchi

et al. 2018

Polymer Composites

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This study presents the non‐isothermal behavior of poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) (PHBV) biodegradable films with 1–5 wt% of cellulose nanoparticles (CNs) manufactured by solution casting using N,N‐dimethylformide and chloroform as the solvents. X‐ray diffraction and scanning electron microscopy with field emission gun were performed for CNs in order to determine its morphology and crystalline properties. The effect of non‐isothermal crystallization of PHBV and its nanocomposites was studied using differential scanning calorimetry technique. The incorporation of CNs increases the crystallization rate with up to 3 wt%. Structural parameters were studied using positron annihilation lifetime spectroscopy and small‐angle X‐ray scattering. The free volume does not change upon CNs addition in spite of form less perfect crystals and increase the lamellar thickness. POLYM. COMPOS., 40:3156–3165, 2019. © 2018 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 99%

Novel biodegradable composites based on PHBV: Effect of nanocellulose incorporation on the non‐isothermal crystallization kinetic and structural parameters

Benini¹,

Ornaghi

Bianchi

et al. 2018

Polymer Composites

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“…This finding can be explained based on the greater intensity of light scattered by larger aggregates than by the pre-micelar aggregates in ethanol-water. The higher intensity of the scattered light indicates a higher number of aggregates 22 in the ethanol-water solution than in ethanol. The Rh 1 population did not appear in the dilute ethanol-water solution, but it was notable in the ethanol.…”

Section: Dls and Temmentioning

confidence: 99%

Elucidating Anion Effect on Nanostructural Organization of Dicationic Imidazolium-Based Ionic Liquids

Frizzo¹,

Bender²,

Gindri

et al. 2016

J. Phys. Chem. C

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This work reports the influence of anion structure (Br -, NO 3 -, BF 4 -, and SCN -) in the aggregation process of ionic liquids (ILs), derived from 1,8-bis(3-methylimidazolium-1-yl)octane, in 4.75% ethanol-water solution (v/v). The aggregation behavior was investigated using small angle x-ray scattering (SAXS), nuclear magnetic resonance (NMR), dynamic light scattering (DLS), and transmission electron microscopy (TEM). Spin-lattice relaxation times (T1), obtained by NMR, indicated that the molecular mobility of the ILs changed when aggregates are formed. 1 H-NMR showed distinct chemical shifts as a function of the concentration of [BisOct(MIM) 2 ][2X] (in which X = Br, NO 3 , SCN, and BF 4 ) in solution. This change was associated with different chemical environments experienced by the hydrogen atoms when the aggregation process occurs.This behavior was characterized by the different types of interactions in the aggregates, in accordance with the anion of the IL structure. The SAXS measurements demonstrated that the distance between two molecules, which function as scattering centers, was dependent on the anion hydrophobicity. Less hydrophobic anions resulted in shorter distances between scattering centers due to their better solvating ability. Due to the lower solvating ability of hydrophobic anions, a larger distance between two scattering centers was observed. Furthermore, ILs with more hydrophobic anions (e.g., BF 4 -) resulted in closely-packed aggregates.

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“…In both cases, the X c of the nanocomposites was lower than that of the neat polymer. It is possible that the Mt nanoparticles (both modified and unmodified) had some effect on the crystallization process by disturbing both the organization of the lamellae and crystal formation (Carli et al, 2013).…”

Section: Thermal Propertiesmentioning

confidence: 99%

Effects of the organic modification of different clay minerals and their application in biodegradable polymer nanocomposites of PHBV

Daitx¹,

Carli²,

Crespo³

et al. 2015

Applied Clay Science

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Morphological and structural characterization of PHBV/organoclay nanocomposites by small angle X-ray scattering

Cited by 25 publications

References 40 publications

Novel biodegradable composites based on PHBV: Effect of nanocellulose incorporation on the non‐isothermal crystallization kinetic and structural parameters

Novel biodegradable composites based on PHBV: Effect of nanocellulose incorporation on the non‐isothermal crystallization kinetic and structural parameters

Elucidating Anion Effect on Nanostructural Organization of Dicationic Imidazolium-Based Ionic Liquids

Effects of the organic modification of different clay minerals and their application in biodegradable polymer nanocomposites of PHBV

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