Evaluation of poly(2,6‐dimethyl)‐1,4‐phenylene oxides and related copolymers for high temperature adhesive application

Abstract

Poly‐(2,6‐dimethyl)‐1,4‐phenylene oxides and related copolymers have been evaluated for high temperature adhesive applications. Because of the high‐melting character of these polymers, proper wetting was found to be difficult to achieve. Where such conditions can be obtained, good tensile strength values have been reached up to 600°F. The introduction of allyl group and epoxy group into such polymers provides sites for thermosetting. The fast setting rate of these groups, however, introduces difficulty in bonding procedure. Problems and ways to improve the initial bonding of specimens are discussed.

High-resolution thermogravimetry of poly(2,6-dimethyl-1,4-phenylene oxide)

“…The high-resolution thermograms exhibiting two- stage degradation process are obtained, whereas only a single-stage degradation was reported by a traditional constant heating rate TG. [2][3][4][5] Before the rapid degradation process, a very small weight loss of ϳ 3.4% in nitrogen and 5% in air of initial weight in the temperature range from 200°t o 400°C in nitrogen and from 270°to 420°C in air took place. The thermal degradation of PPO in nitrogen seems to occur through one major fast degradation stage and a minor subsequent slow degradation stage.…”

“…The thermal degradation and kinetics of the PPO have been studied by a few investigators by a traditional thermogravimetry (TG) at a constant heating rate. [2][3][4][5] However, there are few studies on the thermal degradation kinetics of the PPO by a high-resolution TG (High-Res TG) at a variable heating rate that decreases continuously and reversibly with increasing decomposition rate because the High-Res TG is developed recently.…”

Mass spectrometric studies. I. Fragmentation of methyl cyclohexyl ether

“…Such spectral changes are to be expected with the inclusion of a ring, and many examples of the mass-spectral changes caused by rings are available. 8 In a study of the effects of deuterium on the conformational equilibria of substituted cyclohexanes,9 a series of deuteriated methyl cyclohexyl ethers became available. These compounds have permitted a detailed study of the fragmentation of this simple cyclic methyl ether.…”