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The influence of mechanical tensile stress on the photodegradation of commercial drawn polyolefin tapes has been investigated. The degradation was monitored by the time-to-break in creep experiments. Surprisingly, photodegradation had little effect on creep rates of polyethylene and only a small...
This paper compares the analysis of the molecular weight distribution of a poly(methyl methacrylate) (PMMA) sample by gel permeation chromatography (GPC) and by matrix-assisted laser desorption ionisation (MALDI) mass spectrometry. The results show that the MALDI technique may be producing MW...
The chemiluminescence (CL) emission of polypropylene films stabilised with phenolic antioxidants was studied at 150 °C under oxygen with a CL-imaging apparatus. Results show that the oxidation induction time measured by CL can be related to the antioxidant concentration in the film and...
The drop of the elongation at break of gamma irradiated polypropylene samples has been studied as a function of dose and of time after irradiation. A simple relation is proposed that takes into account two chain scission mechanisms, one occurring during irradiation and the other operative after...
The photooxidation (fluorescent lamp; λ max = 365 nm; intensity = 7 × 10 18 photons cm −2 h −1 ; temperature: 40 °C) of photochemically unstabilised polypropylene films (thickness 100 microns) was studied by gravimetric and IR spectrophotometric methods. After a pseudo-induction period,...
The cellulosic insulation materials in operational transformers undergo a slow thermal degradation during the life-time of the transformer to form furans which dissolve in the insulation oil of the transformer. There are six furans formed in significant quantity in an operational transformer....
Three sulphonylated polystyrenes, obtained by sulphonylating polystyrene with the corresponding sulphonyl chlorides, have been characterized by IR and NMR spectroscopy. Elemental analysis shows 76.6, 96.5 and 73.9 mol% of sulphone groups in poly 4-(benzene sulphonyl)styrene, poly 4-(4-toluene...
The chemiluminescence (CL) emission from three kinds of polyethylene, HDPE, LLDPE and LDPE, which had been exposed to 80 kGy dose from 60 Co in both air and nitrogen, has been examined. CL measurement was done under both nitrogen and oxygen atmosphere. The results show that the CL emission from...
Using a CCD imaging detector of broad spectral sensitivity, the chemiluminescent (CL) emission wavelength of accelerated thermal oxidation of polypropylene has been found to depend on the extent of oxidation of the material. Initial Chemiluminescence occurs mainly below 385 nm, and this is...
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