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

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By Harald Pasch, Muhammad Imran Malik

This Springer Laboratory quantity introduces the reader to complicated concepts for the separation and fractionation of polyolefins. It contains targeted info on experimental protocols and techniques, addressing the experimental historical past of alternative polyolefin fractionation techniques in nice aspect. The ebook summarizes vital functions in all significant fractionation methods with emphasis on multidimensional analytical methods. It includes the main strong glossy suggestions, comparable to extreme 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 reap the benefits of this concise advent to a good kind in instrumentation, separation procedures and functions. With special descriptions of experimental methods for the research of advanced polyolefins, the readers are provided a toolbox to unravel uncomplicated in addition to subtle separation tasks. The publication starts off with an advent into the molecular complexity of polyolefins - the main standard man made polymers with speedily transforming into creation capacities. It systematically discusses crystallization dependent fractionation techniques together with TREF, CRYSTAF and CEF and column chromatographic recommendations for molar mass, chemical composition and microstructure, in addition to the combo of alternative fractionations in multidimensional experimental setups. This publication additionally comprises easy details at the program of high-temperature field-flow fractionation.

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Investigated the effect of the tacticity distribution on the thermooxidative degradation behaviour of PP by using TREF, NMR and thermographic analysis (TGA) [29]. It has been shown that atactic PP is more stable due to the hindered abstraction reaction of tertiary hydrogen. The abstraction of tertiary hydrogen was the rate-determining step in PP degradation and its dependence on tacticity distribution was correlated to the rate of degradation of PP. Therefore, the presence of more meso sequences in the chain will enhance the rate of thermooxidative degradation.

1 Aim An important step in the development of new or improved materials is the correlation of molecular structure and material properties. For molecular structure elucidation of complex polyolefins, TREF has been shown to be an invaluable tool. For LLDPE, TREF fractionation produces copolymer fractions that differ in comonomer content. These fractions are then analysed by spectroscopic methods (chemical composition, microstructure), SEC (molar mass) and calorimetric methods (melting and crystallization behaviour) for the development of structure–property correlations.

The thermo-oxidative degradation of thin films at 90  C and 110  C was accomplished in a heat-circulating oven with digital temperature control (SMC manufacturing, Cape Town, South Africa). 1 Temperature Rising Elution Fractionation 37 38 2 Crystallization-Based Fractionation Techniques regular intervals for further analysis. The degradation process was discontinued when samples snapped or flaked on bending. The degraded films were homogenized by shredding the film into small pieces and re-melting into a single film for a very brief time.

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