Pyrolysis of anionic and thermally prepared polystyrenes

Abstract

The changes in molecular weights, their distributions, and initial rates have been measured, for a series of polystyrenes prepared by thermal and anionic procedures. The information obtained and previous results can be explained to a very large extent by a kinetic chain decomposition comprised of competing end and random initiation, depropagation, intra-and intermolecular transfer and termination by combination.Key words: Anioni c polysl yre ne; molec ular weight distributions; molecular weights; thermal poly· s t yre :1 e; polymer ; pc ! ys t y !"e~e de g!"2da t!op. ; pyrolys is; thermolys is.

Thermal degradation of the blend poly(2,6-dimethyl-1,4-phenylene oxide)-polystyrene

“…The overall agreement with the experimental data is similar to that shown in the paper of Wall and co-workers. 19 The value of (KleK2)/Ktl = 25.5 min-1 at 352 °C is in fair agreement with that (41.9 min'1 at 353 °C) mentioned by Cameron.20 Integral thermogravimetric curves shown in Figure 8 confirm the result described earlier in the literature that polystyrene of high molecular weight (Mn = 450 000) is more stable than lower molecular weight polystyrene (Afn = 100000). Both polystyrene samples had similar polydispersity (Mw/Mn = 1.7).…”

Structure of benzoyl peroxide initiated polystyrene: determination of the initiator-derived functionality by carbon-13 NMR

“…It is hoped that this work will lead to a better understanding of the manner in which the structure and properties of polymers depend on the conditions used in their preparation. [19][20][21][22][23][24] Note Added in Proof. In a recent communication that…”

Binary mixture pyrolysis of polypropylene and polystyrene: A modeling and experimental study

“…The PS samples for which the degradation is reported in Figs. 5 and 6 were obtained from Aldrich and were produced via free radical polymerization, which is believed to create weak links [38][39][40][41][42].…”