Processing methods spin coating

Typical processing methods - spin coating, screen-printing, vacuum deposition Fink, J K, High Performance Polymers, William Andrew, 2008. 

Waterproof modified Silicone strrface was exploit for the self-assembly-driven growth due to H-bonding of complexes NF(acac)2xNaSt(or List) xPhOH with Silicone surface. The saturated chloroform (CHClj) solution of complex NF(acac)2xNaSt(or LiSt)xPhOH (1 1 1) was put on a surface, maintained some time, and then solvent was deleted from a surface by means of special method - spin-coating process. 

PPV is a yellow fluorescent EAP with emission maxima at 551 nm (2.25 eV) and 520 nm (2.4 eV), in the yellow-green region of the visible spectrum (266). Soluble PPVs have been prepared by the precursor method, allowing for solution processing by spin coating onto a substrate (267). 

The process of spin coating has been applied for coating substances for more than the past five decades. There are many fabrication methods that can be employed to obtain the desired coating or film quality. An attempt to summarise all the available work on spin coating fabrication processes is outside the scope of this chapter and hence, only the important fabrication methods along with key examples have been summarised in this part of the chapter. The contents presented in this chapter will mainly focus on the different fabrication techniques related to the spin coating process for various applications and the resultant properties of the final polymer film. 

In Section 13.2, we introduce the materials used in OLEDs. The most obvious classification of the organic materials used in OLEDs is small molecule versus polymer. This distinction relates more to the processing methods used than to the basic principles of operation of the final device. Small molecule materials are typically coated by thermal evaporation in vacuum, whereas polymers are usually spin-coated from solution. Vacuum evaporation lends itself to easy coaling of successive layers. With solution processing, one must consider the compatibility of each layer with the solvents used for coating subsequent layers. Increasingly, multilayered polymer devices arc being described in the literature and, naturally, hybrid devices with layers of both polymer and small molecule have been made. 

The kinetics of PAA, synthesized from 4,4 -oxydianiline and pyromellitic dianhydride, solid-state imidization both in filler absence and with addition of 2 phr Na+-montmorillonite was studied [1], The nanofiller was treated by solution of P-phenylenediamine in HC1 and then washed by de-ionized water to ensure a complete removal of chloride ions. The conversion (imidization) degree Q was determined as a function of reaction duration t with the aid of Fourier transformation of IR-spectra bands 726 and 1014 cm 1. The samples for FTIR study were obtained by spin-coating of PAA/Na+-montmorillonite mixture solution in N,N-dimethylacetamide on KBr disks, which then were dried in vacuum for 48 h at 303 K. It was shown, that the used in paper [1] method gives exfoliated nanocomposites. The other details of nanocomposites polyimid/Na+-montmorillonite synthesis and study in paper [1] were adduced. The solid-state imidization process was made at four temperatures 7) 423, 473, 503 and 523 K. 

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