Journal ArticleDOI
Synthesis and properties of polyimide–clay hybrid
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TLDR
A polyimide hybrid with montmorillonite clay mineral has been synthesized from a dimethylacetamide (DMAC) solution of poly(amic acid) and a DMAC dispersion of montmoroniite intercalated with an ammonium salt of dodecylamine as mentioned in this paper.Abstract:
A polyimide hybrid with montmorillonite clay mineral has been synthesized from a dimethylacetamide (DMAC) solution of poly(amic acid) and a DMAC dispersion of montmorillonite intercalated with an ammonium salt of dodecylamine. Montmorillonite consists of stacked silicate sheets about 2000 A in length, 10 A in thickness. In this hybrid, montmorillonite is dispersed homogeneously into the polyimide matrix and oriented parallel to the film surface. Thanks to this special structure, this hybrid showed excellent gas barrier properties. Only 2 wt % addition of montmorillonite brought permeability coefficients of various gases to values less than half of those of ordinary polyimide. Furthermore, this hybrid had low thermal expansion coefficient. © 1993 John Wiley & Sons, Inc.read more
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Journal ArticleDOI
Spontaneous swelling of layered nanostructures by a polymer melt
TL;DR: In this paper, molecular dynamics simulations of this formation process are presented, which is modeled by the flow of polymer from a bulk melt into a slit whose walls are maintained at constant pressure and whose surfaces are decorated by grafted short hydrocarbon chains, and compared with x-ray diffraction studies of the intercalation of high molecular weight polymers into organically modified silicates.
Journal ArticleDOI
Effects of nanoclay and nanocomposites on bitumen rheological properties
Luisa Gardenia Alves Tomé Farias,Janaina Lopes Leitinho,Bruno de C. Amoni,Juceline Batista dos Santos Bastos,Jorge Barbosa Soares,Sandra de Aguiar Soares,Hosiberto B. de Sant'Ana +6 more
TL;DR: In this paper, the organoclay montmorillonite (OMMT) was prepared to be used as an additive for bitumen and for a polymer modified bitumen, and a nanoclay Cloisite® 20 A (CLO) was also investigated for comparison purposes.
Journal ArticleDOI
Montmorillonite-based nanocomposites of polybenzoxazole: Synthesis and characterization (I)
TL;DR: In this article, the intercalation of heterocyclic polymer chains to hexadecylamine-montmorillonite (C16-MMT) was investigated and it was found that the addition of only a small amount of organo-clay was enough to improve the mechanical properties of PBO.
Patent
Intercalates and exfoliates formed with monomeric carbonyl-functional organic compounds, including carboxylic and polycarboxylic acids; aldehydes; and ketones; composite materials containing same and methods of modifying rheology therewith
TL;DR: In this article, the intercalates formed by contacting a layered material, e.g., a phyllosilicate, with an intercalant monomer carbonyl functional compound and/or a carboxylic acid-functional compound, were used to expand the adjacent platelets to a spacing of at least about 5 Å.
Journal ArticleDOI
Effects of annealing (solid and melt) on the time evolution of polymorphic structure of PA6/silicate nanocomposites
Xiao Hu,Xiongyan Zhao +1 more
TL;DR: In this paper, the effects of annealing including solid-state and melt-state annealings on the polymorphic behavior and thermal properties of polyamide 6 (PA6)/layered-silicate nanocomposites (P6LSN) have been investigated as a function of annaling time using Modulated Differential Scanning Calorimetry (MDSC) and wide angle X-ray diffraction.