Composites polymer/inorganic compound

The wide range of soHd lubricants can generally be classified as either inorganic compounds or organic polymers, both commonly used in a bonded coating on a matching substrate, plus chemical conversion coatings and metal films. Since solid-film lubricants often suffer from poor wear resistance and inabihty to self-heal any breaks in the film, search continues for improved compositions. 

To open up new application fields, the structure and properties of BC membranes/composites can be modified by low-molecular organic and inorganic compounds, including monomers and metals/metal oxides, via carbohydrates and polysaccharides, up to different types of other natural and synthetic polymers. 

A more recent trend in polymer materials research is the hybridization of cellulosic polysaccharides with inorganic compounds natural and synthetic layered clays, silica, zeolites, metal oxides, and apatites are employable as nanoscale components. In addition, if mesoscopic assemblies such as liquid-crystalline ordering are used in the construction of new compositional systems, the variety of functionalized cellulosic materials will be further expanded. 

Composites have been prepared by rather different methods due to the great variety of inorganic and organic materials used. (See also Sect. 2.5. and Chap. 7) Lamellar nanocomposites consisting of layered inorganic compounds and conducting polymers display novel properties which result from the molecular-level interactions of two dissimilar chemical components. The intercalative polymerization of aniline in an a-RuCL host has recently been reported. The insertion of aniline into a-RuCls has been executed by soaking the a-RuCL crystals in aniline or ani-... 

Polymorphism, which means existence of different crystalline forms, is a phenomenon observed in many organic and inorganic compounds. Also, natural (e.g., cellulose) and synthetic polymers show numerous polymorphic forms. Among synthetic semicrystaUine polymers, which can be a matrix in composites with lignocellulosic materials, the isotactic polypropylene is the one to take a close look on this phenomenon. 

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