High-temperature gel-permeation chromatography of poly(4-methyl-1-pentene)
- Allied-Signal Aerospace Co., Kansas City, MO (USA). Kansas City Div.
A high-temperature gel-permeation chromatographic (HTGPC) method has been developed for molecular weight (MW) characterization of poly (4-methyl-1-pentene), PMP. Like most high-MW polyolefins, PMP is difficult to handle because of solubility problems. Techniques for overcoming the solubility problems are discussed. The effects of sample concentration and of extended analysis temperature exposure on the results obtained by HTGPC were investigated. Thermo-oxidative degradation of the polymer could be readily observed despite the addition of an antioxidant and thermal stabilizer to the carrier solvent. The rate of degradation for PMP appeared to be greater than for polypropylene (PP) or for polyethylene (PE) as was expected based on the branched structure of PMP. Efforts to reduce degradation are described. Results for two commercial grades of PMP, one in pellet form for injection molding and another in bar stock form for machining, are presented. Results from two in-house developmental PMP type resins are compared with those from the pellet type. 8 refs., 12 figs.
- Research Organization:
- Allied-Signal Aerospace Co., Kansas City, MO (USA). Kansas City Div.
- Sponsoring Organization:
- DOE/DP
- DOE Contract Number:
- AC04-76DP00613
- OSTI ID:
- 5484671
- Report Number(s):
- KCP-613-4127; CONF-8908176--1; ON: DE90002967
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400102* -- Chemical & Spectral Procedures
ALKENES
CHROMATOGRAPHY
GEL PERMEATION CHROMATOGRAPHY
HYDROCARBONS
MOLECULAR WEIGHT
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PENTENES
POLYETHYLENES
POLYMERS
POLYOLEFINS
POLYPROPYLENE
SAMPLE PREPARATION
SEPARATION PROCESSES
THERMAL DEGRADATION