Multilayer film composite structures

Amine Functional Specialty Polymers as Adhesives in Multilayer Film Composite Structures... 

At the bulk level, molecular and polymeric materials also offer flexibility of fabrication in various forms such as crystals, films, fibers, as well as monolayer and multilayer Langmuir-Blodgett films. In addition, one can make composite structures to introduce multifunctionality at the bulk level. 

To replace glass, a plastic substrate must offer the properties of glass, i.e. clarity, dimensional stability, thermal stability, barrier, solvent resistance, low coefficient of thermal expansion, and a smooth surface. No plastic film has all these properties so any plastic based substrate will almost certainly be a multilayer composite structure. In addition to choosing the right materials for the different layers, one now has a new set of issues associated with the properties of multilayer structures. These issues include the adhesion of the different layers, the effect of thermal and environmental cycling, and the effect of flexing the structure, not only on specific... 

The best way for the reader to learn is to study actual examples of parts made by the blow molding of fluoropolymers. A majority of such parts have a multilayer construction to combine the properties of other plastics in a composite structure. The most common technique for producing multilayer sheet/film is coextrusion. The chemical resistance of fluoropolymers makes them attractive materials for inner layers of containers that come in contact with aggressive chemicals that can swell or degrade thermoplastics. 

A thin film composite reverse osmosis membrane can be defined as a multilayer membrane in which an ultrathin semipermeable membrane layer is deposited on a preformed, finely microporous support structure. This contrasts with asymmetric reverse osmosis membranes in which both the barrier layer and the porous substructure are formed in a single-step phase inversion process and are integrally bonded. 

Certainly one of the most interesting applications lies in the control of architecture (control of hole and electron injecting and active layers) in very thin electroluminescent devices. The existence of a precursor polyelectrolyte Pre-PPV (39,90,91) of the electroluminescent material poly(p-phenylene-vinylene) (PPV) (92) makes it possible to fabricate polyion multilayer film architectures, in which the Pre-PPV can subsequently be converted to PPV by thermal annealing (19,34-38,87,88,93). The first electroluminescent devices have been prepared and it was found that devices as thin as 13 nm emit light (88). Tum-on voltages of less than 2 V are required to generate light (35) and even an influence of the film architecture on the luminescent properties has been observed (88). However, the structural details of these films are presently not understood and it is not clear how device properties are influenced by film composition and architecture. We have recently shown that the thermal conversion of Pre-PPV to PPV can be carried out with preservation of a layered structure. These results were obtained by neutron reflectometry on... 

Du et al. [67] investigated effects of layered architecture and blend morphology on the SM behavior using thermoplastic PU and PCL. The PU/PCL ratios set were 75/25,50/50, and 25/75, respectively. The layered structure was achieved by a special multilayer coextrusion technique. The layer thickness varied with the composition ratio whereby keeping the number of layers and the overall thickness of the multilayer film as constants. of PCL served as 70 °C) during shape... 

Zhang and Mu [53] reported a new approach to fabricate the GdS thin films by annealing the Cd " "-dithiol multilayer films on both quartz and mica substrates and characterized the change of the composition, structure, and optical properties of the films before and after annealing. It opens up the possibility to fabricate the chalcogenide thin films by annealing the self-assembled multilayer films of metaUic ion and organic dithiol [53]. 

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