Q1. Study the effect of hydrogen as a chain transfer agent on the ethylene and propylene...

Q1. Study the effect of hydrogen as a chain transfer agent on the ethylene and propylene polymerization.

Expert Solution

Hydrogen is mainly used for the control over molecular weight of all polyolefins prepared with Ti-based Ziegler-

Natta catalysts.

It generally happens that the Ti−C bond in a growing polymer chain undergoes the hydrogenolysis reaction in the presence of molecular hydrogen with the formation of the Ti−H bond and separation of a polymer chain from the active center as per following reaction:

Ti−CH2−CH(CH3)−Polymer + H2 → Ti−H + (CH3)2CH−Polymer

Due to above reaction, it helps to control the molecular weight of polymers. Basically, the amount of hydrogen needed to reduce the molecular weight of polypropylene or ethylene to a commercially useful level is relatively small and the decrease of the molecular weight is correlated with the hydrogen concentration, C_H in practical industrial applications. Amount of hydrogen required in less amount to control the molecular weight of polyolefins. Hence, in less amount molecular hydrogen can perform this function.

Amanda K answered 1 month ago

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