Molecular weight growth

Plot the selectivity to C4H8 as a function of ethane conversion. Does it behave like a secondary or primary product Consult the paper by Dean (1990), and describe additional reactions which lead to molecular weight growth in hydrocarbon pyrolysis systems. While some higher molecular weight products are valuable, the heavier... 

However, under fuel-rich conditions, further molecular weight growth becomes likely by the competing polymerization reactions leading to C3, C4, C5, Ce, aromatics, and polyaromatic speciesJ ° Examples of these reactions include ... 

Figure 2.6 Molecular weight growth in radical, living ionic and step-addition...

The carbanionic ethylene adduct can also undergo a cyclization reaction to indanes with elimination of a hydride ion (Reaction la). This reaction is more pronounced with organopotassium or some complex organopotassium catalysts (2). High-molecular-weight growth products are not obtained from either sodium- or potassium-derived catalysts. 

With increases in AA-Na concentration, the viscosity of the polymerization product increases suddenly, when the molality of AA-Na exceeds the unit molality of PEG (Fig. 5). It seems that phase inversion occurs PAS in the PEG to PEG in the PAS. The viscosity of the diluted solution of the pol3nnerization product also increases, which might represent the resulting PAS molecular weight growth due to the high monomer concentration. 

On controlling the molecular weight growth in macromonomer and polymer synthesis and the molecular weight polydispersity of the block copolymer by a proper choice of the reaction conditions, polymacromonomers with desirable properties could be produced. The amphiphilic block copolymer thus obtained having a combination of hydrophobic-... 

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