Organically modified layered-silicates facilitate the formation of interconnected structure in the reaction-induced phase separation of epoxy/thermoplastic hybrid nanocomposite

Polymer ◽  
2005 ◽  
Vol 46 (18) ◽  
pp. 7612-7623 ◽  
Author(s):  
Mao Peng ◽  
Hongbing Li ◽  
Lijuan Wu ◽  
Ying Chen ◽  
Qiang Zheng ◽  
...  
Keyword(s):  
Phase Separation ◽  
Layered Silicates ◽  
Hybrid Nanocomposite ◽  
Organically Modified ◽  
Interconnected Structure

Microstructural Evolution of Melt Intercalated Polymer−Organically Modified Layered Silicates Nanocomposites

1996 ◽  
Vol 8 (11) ◽  
pp. 2628-2635 ◽  
Author(s):  
Richard A. Vaia ◽  
Klaus D. Jandt ◽  
Edward J. Kramer ◽  
Emmanuel P. Giannelis
Keyword(s):  
Microstructural Evolution ◽  
Layered Silicates ◽  
Organically Modified

Biodegradable Polyester / Layered Silicate Nanocomposites

2002 ◽  
Vol 740 ◽  
Author(s):  
Pralay Maiti ◽  
Carl A. Batt ◽  
Emmanuel P. Giannelis
Keyword(s):  
Mechanical Properties ◽  
Storage Modulus ◽  
Layered Silicate ◽  
Layered Silicates ◽  
Melt Extrusion ◽  
Biodegradable Polyester ◽  
Modified Montmorillonite ◽  
Organically Modified Montmorillonite ◽  
Silicate Nanocomposites ◽  
Organically Modified

ABSTRACTNanocomposites of α-hydroxy polyester, polylactide (PLA) and β-hydroxy polyester, polyhydroxybutyrate (PHB) with layered silicates have been successfully prepared by melt extrusion of PLA and PHB with organically modified montmorillonite (MMT) and fluoromica. The mechanical properties of the nanocomposites are improved compared to the neat polymers. Storage modulus increase up to 40% compared with the pure polymers by adding only 2–3 wt% nanoclay. Biodegradation can be controlled by the choice of the nanoclay used.

Dispersion of Organically Modified Layered Silicates in Melt Blended Poly(Lactic Acid) Composites: Effects of Cation Head Groups and Oxygenated Alkyl Chains

2013 ◽  
Vol 50 (11) ◽  
pp. 665-675
Author(s):  
D. M. Fox ◽  
M. Zammarano ◽  
M. Novy ◽  
L. M. Haverhals ◽  
H. De Long ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Layered Silicates ◽  
Poly Lactic Acid ◽  
Alkyl Chains ◽  
Head Groups ◽  
Organically Modified

scholarly journals Incorporation of Organomodified Layered Silicates and Silica in Thermoplastic Elastomers in Order to Improve Tear Strength

2012 ◽  
Vol 714 ◽  
pp. 217-227 ◽  
Author(s):  
Olivier Jaudouin ◽  
Jean Jacques Robin ◽  
Didier Perrin ◽  
Rodolphe Sonnier ◽  
Patrick Ienny ◽  
...  
Keyword(s):  
Fumed Silica ◽  
Weight Percent ◽  
Thermoplastic Elastomers ◽  
Layered Silicates ◽  
Tear Strength ◽  
Fumed Silica Nanoparticles ◽  
Styrene Copolymers ◽  
Organically Modified ◽  
Fibrous Morphology ◽  
Internal Mixer

Organomodified layered silicates and silicas have been incorporated in thermoplastic elastomers such as styrene-ethylene-butylene-styrene copolymers (SEBS) and polyurethanes (PU) in order to improve mechanical properties - especially tear strength. The organically modified layered silicates used were Cloisite® 30B, a montmorillonite modified with a ternary ammonium salt with hydroxyls as end groups and Nanofil®2 which is organically modified by long chains of hydrocarbon and benzyl groups. Sepiolite, a natural clay with fibrous morphology was also used. The silicas incorporated are Aerosil 300, hydrophilic fumed silica and Aerosil R202, hydrophobic fumed silica. nanoparticles are incorporated between 1 and 5 weight percent. A compatibilizer SEBS grafted with maleic anhydride has been incorporated in some of the formulations for a better dispersion of some of the nanoparticles. Different ways of incorporation have been investigated. For SEBS formulations, melt blends of SEBS pellets and clays have been prepared with an internal mixer and then films have been casted. For polyurethanes, solvent blending of polyols and clays were carried out in a vessel and then, compression molding of the blend with diisocyanates was made to synthesize polyurethanes. Materials have been compared on the basis of normalized tear test and sequenced tensile test. Mechanical parameters, as stabilization ratio (Mullins effect) and viscoelastic ratio, have been defined by integration of the stress-strain curves obtained. An interesting improvement of tear strength was observed for modified materials.

The Phase Structure of Novel Polycarbonate-Based Polyurethane-Organoclay Nanocomposites

2012 ◽  
Vol 560-561 ◽  
pp. 771-775 ◽  
Author(s):  
Jelena Pavličević ◽  
Snežana Sinadinović-Fišer ◽  
Milena Špírková ◽  
Jaroslava Budinski-Simendić ◽  
Olga Borota ◽  
...  
Keyword(s):  
Phase Separation ◽  
Hard Segment ◽  
Hexamethylene Diisocyanate ◽  
Step Procedure ◽  
Uniform Dispersion ◽  
Organically Modified ◽  
One Step ◽  
Silicate Layers ◽  
Polyurethane Nanocomposites ◽  
Butane Diol

Polycarbonate-based polyurethane nanocomposites were prepared using one step procedure by addition of either organically modified bentonite or montmorillonite (1 wt. %). All aliphatic components (polycarbonate diol, hexamethylene-diisocyanate and 1,4-butane diol) were used as reactants. The hard segment content of obtained thermoplastic polyurethanes was 30 wt. %. Scanning electron microscopy (SEM) was performed to investigate the morphology of obtained hybrid materials. The structure of synthesized elastomers was studied by Fourier transform infrared spectroscopy (FTIR). In order to obtain the degree of phase separation and investigate the hydrogen bonding constitution, deconvolution of –NH and –C=O IR regions was done, using Gaussian equations. It was determined that the degree of phase separation is not influenced by addition of organoclays, indicating uniform dispersion of silicate layers in the polyurethanes, which was also confirmed by SEM experiments.

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