Polymer/layered silicate nanocomposites: a review from preparation to processing

Interpretation of X-ray Powder Diffraction Patterns . By H. Lipson and H. Steeple. Pp. viii + 335 + 3 plates. (Mac-millan: London; St Martins Press: New York, May 1970.) £4.

X-Ray Diffraction

Concepts for the incorporation of inorganic building blocks into organic polymers on a nanoscale

Comparison of the mechanical properties of rice husk powder filled polypropylene composites with talc filled polypropylene composites

Role of organically modified layered silicate as an active interfacial modifier in immiscible polystyrene/polypropylene blends

The influence of preparation method upon the structure and relaxation characteristics of poly(methyl methacrylate)/clay composites

The performance of selected unsaturated coatings for calcium carbonate filler in polypropylene

Calcium carbonate has been modified with three surface modifying systems based upon stearic acid, acrylic acid and a reactive coating comprising acrylic acid with dicumyl peroxide through dry blending. Polypropylene homopolymer was compounded with the coated and uncoated fillers (0 to 65 wt%) through twin screw extrusion. Infrared and extraction investigations showed that the acrylic acid coatings reacted extensively with the filler surface to produce both tightly bound and loosely bound calcium acrylate. Direct evidence for transfer grafting between the calcium acrylate and the polypropylene in the reactive coating was obtained through selective dissolution of the matrix phase and filler with hot xylene and dilute hydrochloric acid, respectively. For coatings without peroxide, complete dissolution of the compound into the inorganic and organic phases was possible, whilst for those with peroxide, an insoluble fraction was obtained. Infrared analysis showed that this was a grafted structure comprising calc...

Reactive surface treatment for calcium carbonate filler in polypropylene

Poly(methyl methacrylate)–clay composites were synthesized through free-radical solution polymerization of methyl methacrylate in the presence of clay that was preintercalated with dodecylammonium or hexadecyltrimethylammonium ions. Neither the diffraction peak from the (001) plane nor the 00l reflections for the (001) plane were observed during x-ray characterization, showing that the clay particles were greatly expanded (i.e., exfoliated) in the reaction products, due to the presence of large quantities of polymer between the clay layers. Syntheses carried out with high clay loadings resulted in reductions in the weight and number-average molecular weights and increases in the polydispersities of the polymers, caused by chain transfer to active sites on the surface of the clay. It was found that heat and shear, during subsequent processing of the reaction products, resulted in reordering of the microstructure through narrowing of the clay galleries with the partial exclusion of the polymer. The final in...

Effects of shear and thermal history on the microstructure of solution polymerized poly(methyl methacrylate)–clay composites

A blend of high-density polyethylene and an elastomeric poly(ethylene-co-1-octene) resin, containing 25 mol % octene and long-chain branching, was phase-separated in the melt under quiescent conditions. After melt flow, the blend had fine globular or interconnected phase morphologies that were interpreted as originating from the various stages of coarsening after liquid-liquid phase separation through spinodal decomposition. It was inferred that the miscibility of the blend was enhanced under melt flow. After cessation of flow, concurrent liquid-liquid and solid-liquid phase separation took place, resulting in the formation of an interpenetrating morphology comprising amorphous polyethylene, copolymer, and crystalline polyethylene.

Arunee Tabtiang

Papers

The influence of preparation method upon the structure and relaxation characteristics of poly(methyl methacrylate)/clay composites

The performance of selected unsaturated coatings for calcium carbonate filler in polypropylene

Reactive surface treatment for calcium carbonate filler in polypropylene

Effects of shear and thermal history on the microstructure of solution polymerized poly(methyl methacrylate)–clay composites

Melt‐flow‐induced phase morphologies of a high‐density polyethylene/poly(ethylene‐co‐1‐octene) blend