Ethylene degradation with loss

The polymerization of Polymer 10 reached its maximum torque in 7 minutes (390 meter-grams) then died and began to degrade with loss of melt viscosity, even at this low polymer melt viscosity level and familiar polymerization temperature. Ethylene glycol chain extended polymers have been anomalous polymerizations and polymers in our experience due, we believe, to abnormal chemistry that can occur during their preparation. 

Ethylene derivs. from carboxylic acids via imidazole N- C-acyl group migration and Norrish type II cleavage Degradation with loss of 2 C-atoms... 

Ethylene derivatives from halogenoearboxylie acids Degradation with loss of 1 G-atom Perfluoro compounds... 

Chauaqui et al (10) show that y irradiation of two types of kraft lignin with about 2.4 Mrad of dose leads to polymerization materials. High dose of 10 Mrad are required to induce degradation reactions with loss of methoxyl groups. Their results indicate that the most important free radicals formed involved phenolic hydroxyl groups, a carbonyl groups and a ethylenic double bonds. Unfortunately the dose rate used was not reported. 

The spectra of alkaloids of the lycopodine type (160) having a hydrogen atom available in position 4 are characterized by a very easy loss of the bridge connecting C-5 and C-12. In this reaction the hydrogen at C-4 is involved (160)->[161]->[162].74 Further degradation proceeds with elimination of CO or ethylene or both.74,75... 

---