The thermal degradation of poly‐p‐xylylene

Abstract

The thermal stability of poly‐p‐xylylene prepared in solution by the Hofmann reaction has been measured by a viscometric method. The polymer decomposes by a first‐order random cleavage mechanism with an activation energy of 58 kcal./mole. The latter value is identified with the bond strength of the carbon‐carbon bond between methylene groups connecting benzene rings. The stability of this polymer is thus limited only by the strength of the weakest link along the chain. The polymer is shown to be more stable thermally and more soluble than polymer prepared from p‐xylene by the pyrolytic method. The effect of chain transfer agents on the thermal stability was investigated.

Poly(p-phenylene alkylene)s – A forgotten class of polymers

“…The polymer is hydrophobic and offers an attractively low dielectric permittivity. Moreover, PPX exhibits excellent thermal [14][15][16] and mechanical 17) properties, good solvent resistance, high crystallinity, and bulk barrier properties which are among the best of organic polymeric coatings 13,18) . Thus, PPX-coatings are attractive materials for the use in electronics, medical applications, optical devices, and other applications 13) .…”

Thermal stability of substituted poly-xylylenes

“…It is likely that the sulphide group may play a role of free-radical source [6], so as to speed up the degradation.…”

Determination of the weight-average molecular weight of polyamide-6 on the basis of melt viscosity

“…Hence the kinetic equation of the random chain scission reaction may be written as follows, e.g. [23][24][25][26][27][28][29]…”