| Wax crystallization from solution in hierarchical morphology templated by random poly(ethylene-co-butene) self-assemblies (2006) | |||||||||||
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| Macromolecules Wax Crystallization from Solution Hierarchical Morphology Templated Random Poly ethylene butene Self assemblies Aurel Radulescu Dietmar Schwahn Jorg Stellbrink Emmanuel Kentzinger Manfred Heiderich and Dieter Richter Institute for Solid State Research Research Center Julich GmbH Julich Germany Lewis Fetters School Chemical and Biomolecular Engineering Cornell UniVersity Ithaca New York ReceiVed May ReVised Manuscript ReceiVed July ABSTRACT Semicrystalline poly ethylene butene PEB random copolymers can modify the sizes wax crystals and thus improve the viscoelastic properties crude oil and middle distillate fuels low temperatures The wax copolymer interactions solution are rather complex and not fully understood When the copolymer self assembles temperatures higher than the wax cloud point hierarchy morphologies templated the primordial polymer structure evolves with decreasing temperature Multilevel structures showing characteristic sizes from are formed upon cooling solutions semicrystalline PEB copolymers and wax containing mixed solutions The coplymer structures with the different wax molecules were evaluated three SANS techniques conventional SANS focusing SANS and ultra SANS and contrast matching Complementary microscopy techniques allowed direct visualization these structures real space Introduction Crude oils and refined middle distillate products such diesel fuel kerosene heating oil contain fraction paraffins with broad molecule length distribution Dep | |||||||||||
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