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Polymer Radical Polymerisation

Polymer Radical Polymerisation

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Items (9)

  • What about the temp when reaction occurs if delta Hsmaller0 and delta Ssmaller0?

    reaction occurs always

  • What about the temp when reaction occurs if delta H>0 and delta S<0?

    reaction occurs never

  • What about the temp when reaction occurs if delta H<0 and delta S<0?

    reaction occurs below the ceiling temp

  • Name the equation for Gibbs free energy.

    delta G = delta H - T delta S

  • What causes the presence of O2 in the rad pol?

    O2 works an inhibitor by creating less reactive peroxy radicals at the polymers

  • Under which conditions is v(growth) ~ sqrt( [I] ) wrong?

    In bulk polymerisation cause there is no stationary state where the number of radicals is constant.

  • Under which conditions is v(growth) ~ sqrt( [I] ) right?

    In dilute solutions the number of radicals is constant (stationary).

  • Is it possible to use oxygen as initiator for radical pol?

    yes O2 can form peroxy radical by taking H from the chain. At roomtemp and with NOx in the air not possible.

  • What about the temp when reaction occurs if delta H>0 and delta S>0?

    reaction occurs above floor temp (only rare cases (cyclic monomers)