Abstract
High temperature IR spectroscopy is a rapid tool to identify morphological features,, at least qualitatively. This technique has been used in present work to study phase transitions, mesomorphous crystallinity, effect of branching, and effect of telogens, in both tubular and autoclave LDPE resins. With increasing temperature, most samples undergo transition from a semicrystalline state to amorphous state but samples having a very high initial crystallinity (e.g., Lotrene) become semi-crystalline at high temperatures. Autoclave LDPE samples having long-chain branching show interesting intensity changes in the triplet at 1300–1400 cm −1, when taken to high temperatures. High temperature IR spectra can be used to locate the α-relaxation temperature, (possibly T g) as indicated by the formation of a singlet at 720 cm −1. They can also be used to distinguish autoclave LDPE from tubular LDPE in commercial samples.
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