Journal ArticleDOI
Synthesis and barrier properties of poly(ε‐caprolactone)‐layered silicate nanocomposites
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In this article, a polymer-ceramic nanocomposite was synthesized consisting of well-dispersed, two-dimensional layers of an organically modified mica-type silicate (MTS) within a degradable poly(e-caprolactone) matrix.Abstract:
A new polymer-ceramic nanocomposite has been synthesized consisting of well-dispersed, two-dimensional layers of an organically modified mica-type silicate (MTS) within a degradable poly(e-caprolactone) matrix. A protonated amino acid derivative of MTS was used to promote delamination/dispersion of the host layers and initiate ring-opening polymerization of e-caprolactone monomer, resulting in poly(e-caprolactone) chains that are ionically bound to the silicate layers. The polymer chains can be released from the silicate surface by a reverse ion-exchange reaction and were shown to be spectroscopically similar to pure poly(e-caprolactone). Thick films of the polymer nanocomposite exhibit a significant reduction in water vapor permeability that shows a linear dependence on silicate content. The permeability of nanocomposite containing as low as 4.8% silicate by volume was reduced by nearly an order of magnitude compared to pure poly(e-caprolactone)read more
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Dissertation
Elaboration de mousses nanocomposites polystyrène/silicates lamellaires en milieu supercritique
TL;DR: In this article, les mousses de polystyrene renforce par des objets lamellaires ont ete realisees en milieu supercritique, comme agent de gonflement.
Journal ArticleDOI
Effect of telechelic ionic groups on the dispersion of organically modified clays in bisphenol a polycarbonate nanocomposites by in-situ polymerization using activated carbonates
Journal ArticleDOI
Effect of modified clay on mechanical and morphological properties of ethylene octane copolymer–polypropylene nanocomposites:
Abstract: Ethylene octane copolymer–polypropylene (PP) blend was optimized at 30 wt% of ethylene octane copolymer with PP and the same ratio was kept constant for preparing ethylene octane copolymer–PP nanocomposites (70/30). The nanocomposites were prepared with commercially modified organoclays (C20A and C30B) and laboratory-modified organoclays (OMMT-I and OMMT-II) in the ratio of 3, 5, and 7 wt%. The compatibilizer polypropylene-grafted maleic anhydride (PP-g-MA) was used to get the exfoliated nanocomposites in the ratio of 5, 10, and 15 wt% for C20A, C30B, OMMT-I, and OMMT-II nanocomposites. X-ray diffraction (XRD) and transmission electron microscopy (TEM) results indicated the formation of well-exfoliated morphology at 5 wt% of organoclay and 5 wt% of PP-g-MA compatibilizer. The increase in tensile properties due to the reinforcing effect imparted by organoclays along with high aspect ratio of the clay pallets allowed a greater degree of stress transfer at the interface.
Dissertation
Élaboration de membranes polymères piézoélectriques souples en vue d’applications biomédicales
TL;DR: In this paper, the authors present a travail presente ici porte sur la realisation d'un materiau polymere piezoelectrique destine a etre l’element sensible d’un capteur de deformation de tissus biologiques, which comprend notamment l'etude de lassouplissement du copolymere P(VDF-TrFE) necessaire for se rapprocher des proprietes mecaniques d'une artere, sans degrader son coefficient piez
Journal ArticleDOI
Palygorskite as Efficient Catalyst for Ring-Opening Polymerization of ϵ-Caprolactone
TL;DR: Fiber-like high-surface area and natural nanostructure clay mineral palygorskite (or attapulgite, ATP) containing lots of hydroxyl groups is found to efficiently catalyze the ring-opening polymeriz...