Nanofibers from Polylactic Acid Nanocomposites: Effect of Nanoclays on Molecular Structures

Zhou, Huajun; Kim, Kyoung-Woo; Giannelis, Emmanuel P.; Joo, Yong Lak

doi:10.1021/bk-2006-0918.ch016

Cited by 12 publications

(7 citation statements)

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“…Similar effect was observed for mixture of polymers with ceramic fillers, e.g. PLLA with glass reinforced hydroxyapatite [15], or for PLLA zeolite nanocomposite samples [16]. In comparison with other works, the average diameter of the electrospun coreshell fibres obtained in this work, was remarkably thinner.…”

Section: Morphology and Structural Analysissupporting

confidence: 88%

Tailoring the wettability and mechanical properties of electrospun poly(l-lactic acid)-poly(glycerol sebacate) core-shell membranes for biomedical applications

Yan

Sencadas

Jin

et al. 2017

Journal of Colloid and Interface Science

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Tissue and biomedical engineering fields are in constant mutation and in searching for innovative processing techniques capable to tailor the material properties. In this work, poly(l-lactic acid) (PLLA) and elastomeric poly(glycerol sebacate) (PGS) were dissolved in the same solvents and electrospun together, in a single needle system. A core-shell structure where the hydrophilic PGS was placed onto the surface of the hydrophobic PLLA fibre was obtained for elastomeric concentrations up to 25wt%. It was found that the PLLA:PGS blends are immiscible and the blends present the melting temperatures of the individual polymers. Moreover, their surface properties were deeply influenced by the presence of the PGS, and a superhydrophilic membrane was obtained, after PGS curing at 120°C for 48h. When the concentration of PGS is up to 25wt%, the blend's Young modulus decreases from ∼35.9±7.1 to 7.5±1.4MPa and a twofold improvement in the sample stretchability was observed, compared with the pristine PLLA electrospun samples. Finally, in vitro hypothalamus A59 nerve cell culture shows that the core-shell electrospun samples enhanced cell adhesion and proliferation, suggesting that these developed materials have great potentials for nerve regeneration and biomedical engineering applications.

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Section: Morphology and Structural Analysissupporting

confidence: 88%

Tailoring the wettability and mechanical properties of electrospun poly(l-lactic acid)-poly(glycerol sebacate) core-shell membranes for biomedical applications

Yan

Sencadas

Jin

et al. 2017

Journal of Colloid and Interface Science

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“…This is probably because Bonelike ® can be ionized and carry more chargers, stretching the droplet even further, leading to a decrease of the polymer average fibre diameter. Similar behavior was reported by Zhou et al [25] for PLLAnanoclays electrospun fibres. Finally, the reduction of the average fibre diameter led to an increase of the surface area to volume ratio from 7.8 up to 9.1 µm -1 , calculated from equation 1.…”

Section: Electrospun Fibre Mats Morphologysupporting

confidence: 89%

Incorporation of glass-reinforced hydroxyapatite microparticles into poly(lactic acid) electrospun fibre mats for biomedical applications

Santos

Correia

Silva³

et al. 2017

Materials Science and Engineering: C

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Tissue engineering is constantly evolving towards novel materials that mimic the properties of the replaced injured tissue or organ. A hybrid electrospun membrane of electroactive poly(l-acid lactic) (PLLA) polymer with glass reinforced hydroxyapatite (Bonelike®) microparticles placed among the polymer fibres in a morphology like "islands in the sea" was processed. The incorporation of 60 to 80wt% Bonelike® bone grafts granules with ≤150μm into the polymer solution lead to an amorphous polymeric fibre membranes, and a decrease of the average polymer fibre diameter from 550±150nm for neat PLA down to 440±170nm for the hybrid composite. The presence of Bonelike® in the polymer mats reduced the activation energy for thermal degradation from 134kJ·mol, obtained for the neat PLLA membranes down to 71kJ·mol, calculated for the hybrid composite membranes. In vitro cell culture results suggest that the developed processing method does not induce cytotoxic effects in MG 63 osteoblastic cells, and creates an environment that enhances cell proliferation, when compared to the neat PLLA membrane. The simplicity and scalability of the processing method suggests a large application potential of this novel hybrid polymer-microparticles fibre membranes for bone regenerative medicine.

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“…However, the b-form crystal is a frustrated structure of three 3 1 helices in a trigonal unit cell. According to the relevant papers, [26][27][28][29][30][31][32][33][34][35] it appears b-peaks at 2q z 25, 26.5, 27.9, 29.8 and 31 , of which 2q z 29.8 and 31 corresponding to the (330)/(003) and (023) plane were reported relatively more. Fig.…”

Section: Crystal Structures Of Plla and Its Compositesmentioning

confidence: 99%

“…However, the b-form is thermodynamically metastable and troublesome to obtain under normal operating conditions. 16 Using unique methods can obtain the bform crystals, such as the spinning, [25][26][27][28][29] tensile drawing, 30,31 solid-state coextrusion, 32,33 or adding specic nucleating agents. 34,35 Eling et al 21 reported that b crystals were produced upon tensile drawing at a high temperature to a higher draw ratio.…”

Section: Introductionmentioning

confidence: 99%

Influence of different β-nucleation agents on poly(l-lactic acid): structure, morphology, and dynamic mechanical behavior

Zou

Dong

et al. 2017

RSC Adv.

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Nanofibers from Polylactic Acid Nanocomposites: Effect of Nanoclays on Molecular Structures

Cited by 12 publications

References 0 publications

Tailoring the wettability and mechanical properties of electrospun poly(l-lactic acid)-poly(glycerol sebacate) core-shell membranes for biomedical applications

Tailoring the wettability and mechanical properties of electrospun poly(l-lactic acid)-poly(glycerol sebacate) core-shell membranes for biomedical applications

Incorporation of glass-reinforced hydroxyapatite microparticles into poly(lactic acid) electrospun fibre mats for biomedical applications

Influence of different β-nucleation agents on poly(l-lactic acid): structure, morphology, and dynamic mechanical behavior

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