Thermal properties, CaCO

Zhou and co-workers [27] used calcium carbonate as a reinforcing agent for sulfonated PEEK. The calcium carbonate particles were surface treated and the effect of this on the mechanical and thermal properties were determined. The modulus and yield stress of the composites increased with CaCOs particles loadings. This increase was attributed to the bonding between the particles and the PEEK matrix. DSC experiments showed that the particle content and surface properties influenced the Tg and the T of the composites. The Tg increased with the content of fillers while Tn, decreased. The treated fillers were found to give a better combination of properties, which indicated that the sulfonated PEEK played a constructive role in the calcium carbonate/PEEK composites. 

A.5 Effect of CaCOs on the Thermal Properties of Polypropylene. CaCOs is added to polymers as a filler with the intent of lowering material costs. Calculate the thermal conductivity, the heat capacity, and the density of a polypropylene composite containing 40 wt% CaCOs. Take the following properties for PP ... 

Polymer/CaCOs nanocomposites also exhibit enhanced optical clarity and reduced haze in comparison with conventional micro-CaCOj filled polymers, which encourages their usage for packaging and optical applications. As an example, PMMA/CaCOs nanoeomposites with low filler contents can provide improvements of mechanical and thermal properties over neat PMMA without significant loss in clarity, and may be used in optical devices. ... 

In this chapter, the methods of producing clay-polymer nanocomposites are discussed in detail. The influence of clay reinforcement on the mechanical, thermal and physical properties of thermoplastic and thermosetting polymers is also discussed. This chapter also comprises of processing techniques of polymer nanocomposites using nanoparticles hke Al O, CaCO, TiO, ZnO and SiO as reinforcements. These materials have the potential to alter tribological, electrical and optical properties considerably. 

In this chapter, the study carried out on nanofillers reinforced natural/synthetic rubber has been discussed. After a description on the NR rubber and CaCOs as filler, the development of synthetic composites with the incorporation of micro and nano-CaC03 as a filler material has also been discussed for comparative study. In particular, the role of fillers on the property modification of rubber properties, such as surface properties, mechanical strength, thermal conductivity, and permittivity has been mentioned. The effectiveness of this coating was demonstrated. The importance of well-dispersed nanoparticles on the improvement of the mechanical and electrical properties of polymers is also emphasized. However, one of the problems encountered is that the nanoparticles agglomerate easily because of their high surface energy. 

The fluidized bed reactor is about 60 years old, but only in recent years has its apphcation to coal combustion taken on commercial significance. The fluidized bed is the dispersion of a solid, usually in powder form, by a gas, under flow conditions such that the solid takes on the properties of a gas. Such reactors can be designed to operate continuously. Thermal conduction (heat transfer) in such systems can be high, and, as a result, in the case of coal and air, the combustion can occur at much lower temperatures than in the fixed bed system. Thus, the addition of limestone (CaCOs) or dolomite (CaCOs MgCOs) to the fluidized bed system can result in the reduction of oxides of sulfur and oxides of nitrogen. 

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