Polymer blends optical dispersion effects

The separated metallic S WCNTs were also found to enhance transparent conductive performance in composite films with conductive polymers, particularly the poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOTPSS) blend as it is optically transparent in the visible spectral region (Figure 16.20). In such composites, the conductive polymer blend served the function of dispersion agents, so no surfactants were necessary in the film fabrication. In the work by Wang et al, suspensions of nanotubes (enriched metallic or nonseparated S WCNTs) in DMSO were mixed with aqueous PEDOTPSS in various compositions, and the resulting mixtures were sprayed outo au optically transparent substrate. The sheet resistance results demonstrated that the composite films with enriched metallic SWCNTs were consistently and substantially better in performance than those with nonseparated SWCNTs (and both better than films with neat PEDOTPSS). Aqueous PEDOTPSS is not as effective as commonly used surfactants in the dispersion of SWCNTs, which... 

However, in addition to their thermoplasticity, representatives of PHAs have optical activity, increase induction period of oxidation, exhibit the piezoelectric effect and, what is most important, they are characterized as being biodegradable and biocompatible. At the same time, the PHAs have disadvantages (high cost, brittleness), which can be partially or completely compensated by using composite materials based on blends with other polymers, with dispersed fillers or plasticizers. Taking into account all the above, we have suggested to create a mixed polymer composite based on poly-3-hydroxybutyrate (PHB) and polyisobutylene (PIB). 

In Section 6.5 polymer-polymer miscibility was considered to be an important parameter in the dispersion of the two polymer phases. In this respect a polymer-polymer system can be considered as miscible, immiscible, or partially miscible depending on the relative solubility of the two polymers. Total solubility characterizes a miscible system, insolubility an immiscible system, and partial solubility a partially miscible system. The degree of miscibility has important effects on the mechanical, physical, rheological, and optical properties of the resulting blend. 

---