By C. H. Bamford

ISBN-10: 0444411550

ISBN-13: 9780444411556

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41]. 0 , Hizex 7000;@, Sumikathene MF-40; References p p . 165-1 73 36 The volatile products formed during degradation of polyethylene have been analysed by mass spectrometry by Madorsky [ 381 . Gas chromatographic analysis of the low molecular weight volatilization products was performed later by Moisev et al. [42, 431, and still more recently by Tsuchiya and Sumi [44]. The very efficient separation and quantitative determination performed by these authors is shown in Fig. 22. Pyrolysis temperature ("C) .

These authors have shown that the amount of products formed by radical transfer to primary carbon atoms was much greater than that formed by transfer to secondary carbon atoms. It is suggested that the low reactivity of the hydrogen atoms attached to secondary carbons is due to the steric effect of the methyl groups. 3 POLY-4-METHYLPENTENE-1 A comprehensive study of the thermal degradation of poly-4-methylpentene-1 has been reported by Reginato [57]. It includes the determination of the nature of the volatile products, their rate of evolution and the variation of the molecular weight of the polymer residue with the extent of volatilization.

51) dx _ -0 dt and from eqns. (52) and (26) 1 MI --- -kE Mi dt 23 Generalized treatment for all zip lengths indicates that the molecular weight is constant and the weight loss rate d M ,/dt is first-order with respect t o M , but dependent on the initial mean molecular weight and zip length. If chain transfer is present, the molecular weight decreases rapidly during the early stage of depolymerization, while the rate of weight loss increases, passes through a maximum and then decreases with increasing 't Convenlon Conversion (a) (b) Fig.

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