Catalyst-Polymer Contacting Patterns

Although the concept of the catalytic degradation of polymers has been significantly advanced in the last decade, the terminology has been used to 

The configuration of the combined pyrolysis/catalysis reactor can pose serious engineering problems as pointed out by Songip et al. Because the catalytic zone relies on the products of thermal degradation as its feedstock, it is difficult to 

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Figure 1 Different catalyst-polymer contacting patterns and reactor configurations, each of which has been used to study the catalytic degradation of polymers...

The decomposition of polyethylene in the presence of zeolite Y has also been extensively studied using a variety of catalyst-polymer contacting patterns.Zeolite Y is a component of commercial fluidized catalytic cracking catalysts that is very stable under hydrothermal conditions and has relatively large pores (7.8 A pores and 11.8 A supercages). Since the pores are... 

Polystyrene - The acid-catalysed reaction of polystyrene over zeolites has also been examined over a range of materials.In general, the same shifts in the product distribution as compared to thermal degradation that were observed when silica-alumina catalysts were used were seen when zeolites were employed. The yield of styrene monomer decreased, and the amounts of benzene and indan derivatives increased. The extent to which the catalyst affected the degradation was dependent on the catalyst-polymer contacting pattern. The product distributions observed over particular zeolites are summarized as examples below. 

A holographic polymeric substrate Is formed by casting and curing a polymer precursor in contact with a holographic relief-patterned mold to form a polymeric substrate with a holographic relief-patterned surface. Once cured, the web containing the hologram can be stored or run Into a second print station which applies the catalyst for electroless metal deposition. 

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