Formation of calcium crystallites in dry natural rubber particles

Rippel, Márcia Maria; Leite, Carlos A. P.; Lee, Lay-Theng; Galembeck, Fernando

doi:10.1016/j.jcis.2005.03.014

Cited by 26 publications

(15 citation statements)

References 17 publications

(24 reference statements)

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“…In addition, during their diffusion to the polymeric matrix the Ca 2+ ions can migrate around the NR particles and promote a small degree of calcification. This calcification around NR particles has been previously observed and described in the literature [39]. Multivalent cations and/or anions (e.g., Ca 2+ and PO 4− ) and NR latex anionic proteins could regulate their stability with this calcification [40].…”

Section: Resultssupporting

confidence: 71%

Production and characterization of natural rubber–Ca/P blends for biomedical purposes

Nascimento

Faita

Agostini

et al. 2014

Materials Science and Engineering: C

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Section: Resultssupporting

confidence: 71%

Production and characterization of natural rubber–Ca/P blends for biomedical purposes

Nascimento

Faita

Agostini

et al. 2014

Materials Science and Engineering: C

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“…Tapping‐mode atomic force microscopy (AFM) studies were performed in a Discoverer TMX 2010 (TopoMetrix, Santa Clara, CA) microscope. Topography and phase image were obtained simultaneously with Si probes with a 20‐nm nominal tip radius and with standard laboratory procedures 27, 28…”

Section: Methodsmentioning

confidence: 99%

Polyurethane/acrylate hybrids: Effects of the acrylic content and thermal treatment on the polymer properties

Peruzzo

Anbinder

Pardini

et al. 2010

J of Applied Polymer Sci

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Polyurethane (PU)/acrylate hybrids with different acrylic contents (10,30, 50, 70, and 90 wt %) were prepared by the polymerization of acrylic monomers in the presence of preformed PU chains with polymerizable terminal vinyl groups. Films obtained by the casting of polymer dispersions before and after thermal annealing were characterized by dynamic light scattering, Fourier transform infrared spectroscopy, transmission electron microscopy (TEM), TEM electron energy-loss spectroscopy, differential scanning calorimetry, and gel fraction determination. Small-angle X-ray scattering (SAXS), wide-angle Xray scattering, mechanical properties testing, atomic force microscopy, water contact angle testing, Buchholz hardness testing, and roughness testing of the films were also performed. The effects of the acrylic content and thermal treatment on the structure and properties were determined. TEM showed that a core-shell morphology was formed during polymerization. When the acrylic content increased, smaller particles without core-shell morphologies were observed. TEM energy-loss spectroscopy studies confirmed this observation. Systems with up to 50 wt % acrylic component were homogeneous, as determined by SAXS, before and after thermal annealing. An attempt to incorporate a higher amount of acrylic component led to phase-separated materials with a different morphology and, therefore, different properties. The relationship between the acrylic content and properties did not follow linear behavior.

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“…Removal of divalent metal ions can result in denaturation of the proteins associated with the latex particles due to disturbance of the protein's structure [14]. The highest efficiency of EDTA-4Na on deproteinization of NR followed by EDTA-3Na, EDTA-2Na, and EDTA-1Na, respectively, can be explained by the chemical characteristics of the different EDTA complexes.…”

Section: Effects Of Edta-4namentioning

confidence: 99%

Deproteinization of Nonammonia and Ammonia Natural Rubber Latices by Ethylenediaminetetraacetic Acid

Moonprasith

Poonsrisawat

Champreda

et al. 2017

Advances in Materials Science and Engineering

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Deproteinized natural rubber (DPNR) was made from sodium hydroxymethylglycinate latex (SH-latex) and ammonia latex (NH 3 -latex) by mixing with different forms of ethylenediaminetetraacetic acid (EDTA) in the presence of sodium dodecyl sulfate (SDS). The mixtures were stirred at room temperature followed by centrifugation to separate the denatured proteins. The optimized reaction contained 0.01 wt% ethylenediaminetetraacetic acid tetrasodium (EDTA-4Na) with 1% SDS. The nitrogen contents of the DPNR from SH-latex and NH 3 -latex were reduced to 0.005 wt% and 0.008 wt%, respectively, compared to 0.551 wt% in the starting SH-latex and 0.587 wt% in the NH 3 -latex. SDS-PAGE analysis and FT-IR spectroscopy showed decomposition of latex proteins to peptides of smaller molecular weight. Physical properties of the DPNR rubber were studied. The novel EDTA-4Na treatment is considered an effective deproteinization method with potential application on both ammonia and nonammonia preservative systems.

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Formation of calcium crystallites in dry natural rubber particles

Cited by 26 publications

References 17 publications

Production and characterization of natural rubber–Ca/P blends for biomedical purposes

Production and characterization of natural rubber–Ca/P blends for biomedical purposes

Polyurethane/acrylate hybrids: Effects of the acrylic content and thermal treatment on the polymer properties

Deproteinization of Nonammonia and Ammonia Natural Rubber Latices by Ethylenediaminetetraacetic Acid

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