Effect of Annealing Poly(4-Methylpentene) and of Oxidative Degradation during Annealing

Abstract

Injection molded specimens of a poly(4-methylpentene) (TPX) were annealed at temperatures between 140 and 220 • C for times up to 500 min in air, and the annealed TPX specimens were characterized by the differential scanning calorimeter, UV-visible spectrometry, FT-IR, and X-ray diffraction. The annealing of the TPX specimens at 140-180 • C for 50 min showed little effect on their thermal properties. However, the thermal properties were significantly affected by annealing at 200-220 • C, and the change was dependent on the annealing time. Besides the annealing effect, the thermal properties were also affected by oxidative degradation. Severe oxidative degradation can destroy the crystalline structure and thus decreases the crystallinity. The oxidative degradation phenomenon of the TPX specimens during annealing can be simulated by isothermal scanning of the weight loss in air by thermal gravimetric analysis.

Influence of annealing treatment on the structure and properties of poly(4‐methyl‐1‐pentene)‐based films and membranes

“…However, these subsequent modification processes increase the complexity of separator production technology. In all, poly(4‐methyl‐1‐pentene) (P4MP1) is a good choice, it has lots of great performances, such as heat resistance and chemical resistance . So this material can be used to prepare separator to improve shutdown temperature and solve security problem, thereby ignoring the short circuit caused by high temperature in the process of charging and discharging.…”