Carbon nanoparticles as effective nucleating agents for polypropylene

Vaaben, S. Reyes-de; Aguilar, Antonio; Avalos, F.; Valle, Luis Francisco Ramos‐de

doi:10.1007/s10973-007-8591-9

Cited by 46 publications

(27 citation statements)

References 19 publications

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“…This was thought to be due to the presence of the a-TCP nanoparticles acting as nucleation sites for the formation of PLLA crystallites at lower temperatures. A similar effect of nanoparticles on the T cc of PLLA and other polymer matrices has been reported, providing further evidence that nanoparticles can act as effective nucleating agents to facilitate the crystallization of polymer matrices [32][33][34].…”

Section: Cold Crystallization Temperature (T CC )supporting

confidence: 73%

A comparative study of the thermal and dynamic mechanical behaviour of quenched and annealed bioresorbable poly-l-lactide/α-tricalcium phosphate nanocomposites

et al. 2011

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Section: Cold Crystallization Temperature (T CC )supporting

confidence: 73%

A comparative study of the thermal and dynamic mechanical behaviour of quenched and annealed bioresorbable poly-l-lactide/α-tricalcium phosphate nanocomposites

et al. 2011

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“…The increase on the crystallization temperature indicates a nucleation effect of the HA nanoparticles, with no detriment on crystallinity of the polymer matrix. This behavior has been previously observed with different filler into polymer matrices .…”

Section: Resultssupporting

confidence: 83%

PLLA‐HA vs. PLGA‐HA characterization and comparative analysis

et al. 2013

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The chemical, thermal, thermo‐mechanical, and morphology properties of poly(L‐lactide) (PLLA) and poly(D,L Lactide‐co‐glycolide) (PLGA) composites with 30% hydroxyapatite (HA) were evaluated. The composites were prepared employing the solvent casting technique. The degradation kinetic parameters were obtained using the Coats–Redfern integral method for the reaction order and the E2 function methodology to calculate the activation energy (Ea). The addition of HA to these polymers matrices increased their glass transition temperature. This was confirmed by differential scanning calorimetery and dynamic–mechanical–thermal analysis. Also, the presence of HA increased the crystallization temperature of PLLA, implying a nucleation effect. The PLLA‐HA and PLGA‐HA composites exhibited better thermal stability, higher decomposition temperature, and higher activation energy for the decomposition process than the neat polymers. Morphology and dispersion of the filler are highly responsible for the thermal and mechanical properties of the composites, the PLGA‐HA composites showed a well dispersion but no improvement on storage modulus was found. On the other hand, the storage modulus (E′) of PLLA‐HA was enhanced, with respect to the neat polymer, mainly at temperatures above the glass transition. POLYM. COMPOS., 34:1433–1442, 2013. © 2013 Society of Plastics Engineers

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“…The observed decline can be explained with HAp particles acting as nucleation centers for the formation of PLLA crystals at lower temperatures . A similar effect of nanoparticles on the T cc of PLLA and other polymers is also confirmed by different authors, thus providing further evidence that nanoparticles can act as efficient nucleation centers that facilitate crystallization of the polymer matrix . Inclusion of these agents in the polymer (e.g.…”

Section: Resultssupporting

confidence: 61%

The influence of the preparation conditions and filler content on thermal properties of poly-l -lactide and hydroxyapatite/poly-l -lactide nanocomposite

Miličević

Suljovrujić

2017

Polym. Int.

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Poly‐l‐lactide (PLLA) and hydroxyapatite/poly‐l‐lactide (HAp/PLLA) are two widely used biomaterials for three‐dimensional scaffolds, drug release matrices and implantable medical devices for reparation of bone tissue; diversity in the initial preparation and filler content has a significant influence on different properties such as morphology and crystallinity, thus playing a considerable role in most of these applications. For this reason, PLLA and HAp/PLLA samples with a large difference in crystallinity (from below 20% to over 70%) and filler content (up to 86 wt% of HAp nanoparticles with an average diameter of 80 nm) were prepared and consequent dissimilarities in morphology, crystallinity and thermal properties were investigated by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), wide angle X‐ray diffraction (WAXD) measurements and Fourier transform infrared (FTIR) spectroscopy. Special attention was devoted to analyzing data obtained from thermal measurements. A three‐phase model was employed in order to describe the heat capacity step decline in the nanocomposite; the evolution in different polymer fractions, the crystalline fraction and the mobile and rigid amorphous fractions, with filler content was determined. © 2017 Society of Chemical Industry

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Carbon nanoparticles as effective nucleating agents for polypropylene

Cited by 46 publications

References 19 publications

A comparative study of the thermal and dynamic mechanical behaviour of quenched and annealed bioresorbable poly-l-lactide/α-tricalcium phosphate nanocomposites

A comparative study of the thermal and dynamic mechanical behaviour of quenched and annealed bioresorbable poly-l-lactide/α-tricalcium phosphate nanocomposites

PLLA‐HA vs. PLGA‐HA characterization and comparative analysis

The influence of the preparation conditions and filler content on thermal properties of poly-l -lactide and hydroxyapatite/poly-l -lactide nanocomposite

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