High-resolution thermogravimetry of poly(4-methyl-1-pentene)

Abstract

Thermal degradation and kinetics of poly(4‐methyl‐1‐pentene) were investigated by nonisothermal high‐resolution thermogravimetry at a variable heating rate. Thermal degradation temperatures are higher, but the maximum degradation rates are lower in nitrogen than in air. The degradation process in nitrogen is quite different from that in air. The average activation energy and frequency factor of the first stage of thermal degradation for the poly(4‐methyl‐1‐pentene) are 2.4 and 2.8 times greater in air than those in nitrogen, respectively. Poly(4‐methyl‐1‐pentene) exhibits almost the same decomposition order of 2.0 and char yield of 14.3–14.5 wt % above 500°C in nitrogen and air. The isothermal lifetime was estimated based on the kinetic parameters of nonisothermal degradation and compared with the isothermal lifetime observed experimentally. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 71: 2201–2207, 1999

Semi-crystalline poly(4-methyl-1-pentene) polymers for replication of high aspect ratio diffractive features

“…Its tertiary carbons are active sites for free radical chain mechanism, and the main degradation products are volatile isobutene and propane [55,56]. Thermal stability of P4MP1 is reported to be higher in nitrogen atmosphere [57], and we applied a nitrogen atmosphere to minimize the thermal degradation. DSC and GPC measurements were carried out on molded P4MP1 disks before the actual replication studies to obtain information about thermal behavior and possible fragmentation of the polymer materials (series 1, table 1).…”

Oxygen enrichment from air through multilayer thin low‐density polyethylene films

“…[2][3][4][5][6][7][8][9] Additionally, microporous hollow fiber membrane from polyolefins has been meltmanufactured for the preparation of artificial lungs. 10 -12 Because of its advantages of being easily obtained and processed and being more flexible than most other thermotropic aromatic copolyesters, [13][14][15][16][17][18][19][20][21] as well as having a much lower cost than that of polyvinylpyridine, 22 polypyrrolone, 23 polyimide, 23 and even traditional gasseparation membrane polymers such as polydimethylphenylene oxide, 24 polymethylpentene, 25 polysiloxane, 26 and cellulose derivatives, [27][28][29] PE would possess a better comprehensive performance and potential application for gas separation. Moreover, thermotropic aromatic copolyester is believed to be an excellent gas-barrier material for packaging applications.…”