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By C. H. Bamford

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19. Effect of branching on the thermal stability of various polyolefins [39]. 35 0 100 200 300 Temperature 400 500 ("C) Fig. 20. Differential thermal analysis curves for low-pressure polyethylene Hizex 5000 [41]. Upper curve, in air; lower curve, in a nitrogen atmosphere. Low and high pressure polyethylene were recently compared by thermal and thermogravimetric analysis [41]. The differential thermal analysis curve for low pressure polyethylene is given in Fig. 20. The first endotherm corresponds t o melting and the second to thermal decomposition.

Radical VII could also undergo a scission. 5 kcal mole-’. The molecular weight of the polymer decreases sharply at the beginning of the reaction, and then more slowly. The rapid decrease is assigned to the breaking of abnormal “weak” structures distributed at random dong 43 * * * -CH-CH2-CH-CH2-CHI I I CH2 I (732 y 2 CH CH CH /\ / \ /\ H3C CH3 H3C CH3 H3C CH3 - * - -R. * (2) (2) -CH~CH2~-CH2-CH- I I ‘ CH2 I (1)--t-CH2 CH /\ CH /\ -- * + RH I YH2 CH /\ H3C CH3 H3C CH3 H3C CH3 Scheme 2 [Ref. 571.

20. Differential thermal analysis curves for low-pressure polyethylene Hizex 5000 [41]. Upper curve, in air; lower curve, in a nitrogen atmosphere. Low and high pressure polyethylene were recently compared by thermal and thermogravimetric analysis [41]. The differential thermal analysis curve for low pressure polyethylene is given in Fig. 20. The first endotherm corresponds t o melting and the second to thermal decomposition. The two small exotherms correspond to oxidation. Thermogravimetric analysis (Fig.

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