Advanced Separation Techniques for Polyolefins by Harald Pasch, Muhammad Imran Malik

By Harald Pasch, Muhammad Imran Malik

This Springer Laboratory quantity introduces the reader to complex thoughts for the separation and fractionation of polyolefins. It contains precise details on experimental protocols and tactics, addressing the experimental history of other polyolefin fractionation techniques in nice element. The e-book summarizes very important purposes in all significant fractionation methods with emphasis on multidimensional analytical ways. It contains the main robust glossy recommendations, corresponding to hot temperature measurement exclusion chromatography (HT-SEC) for molar mass research, temperature emerging elution fractionation (TREF) and crystallization research fractionation (CRYSTAF) for the research of chemical composition and branching, extreme temperature two-dimensional liquid chromatography (HT-2D-LC), solvent and temperature gradient interplay chromatography (SGIC and TGIC) and crystallization elution fractionation (CEF). newcomers in addition to skilled chromatographers will take advantage of this concise advent to an outstanding type in instrumentation, separation procedures and purposes. With distinct descriptions of experimental techniques for the research of advanced polyolefins, the readers are provided a toolbox to resolve uncomplicated in addition to subtle separation tasks. The publication begins with an creation into the molecular complexity of polyolefins - the main wide-spread man made polymers with quickly transforming into creation capacities. It systematically discusses crystallization dependent fractionation techniques together with TREF, CRYSTAF and CEF and column chromatographic suggestions for molar mass, chemical composition and microstructure, in addition to the combo of other fractionations in multidimensional experimental setups. This e-book additionally contains easy info at the software of high-temperature field-flow fractionation.

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These effects account for the increase in oxidation induction time and stability. The morphology of IPCs is also affected by the amount of ethylene.

The different rates of degradation can be seen clearly by changes in molar mass upon ongoing degradation, despite of the fact that the nondegraded samples have identical molar masses. The molar mass decrease to approximately 250,000 g/mol was noted during the first stages of degradation (up to 40 h and 115 h for samples 3V and 4V, respectively). However, the Mw decrease for sample 3V was considerably faster compared to sample 4V after longer degradation times. This confirms the higher degradation rates in the copolymer with lower contents of comonomer and isotacticity.

In the Gram–Schmidt plot, CH3/CH2 corresponds to the distribution of propylene and ‘Et content’ corresponds to the ethylene content profile. 1 0 30 35 40 45 50 Elution volume (ml) Fig. 16 SEC-FTIR analysis of the ethylene and propylene crystallinity distributions within the 60  C, 80  C, 90  C and 100  C TREF fractions of IPC (reprinted from [37] with permission of Wiley-VCH) [70–72]. The total polymer concentration is measured by the intensity of the CH2 band, whereas the presence of CH3 groups indicates branching and is characteristic of PP units.

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