Matches in SemOpenAlex for { <https://semopenalex.org/work/W2149042676> ?p ?o ?g. }
Showing items 1 to 78 of
78
with 100 items per page.
- W2149042676 endingPage "1830" @default.
- W2149042676 startingPage "1827" @default.
- W2149042676 abstract "Heterogeneous olefin polymerization increasingly dominates the production of polyethylene, polypropylene and mixed polyolefins. Our studies of the morphology of these catalysts reveal that several different mechanisms occur for the changes in the accessible active surface, the void volume and the distribution of catalytically active particles within the growing polymer. These differences in morphological dynamics are dictated by the initial catalyst pore structure and the related subsequent catalyst fragmentation processes. MgCl2 supported catalyst tend to be uniform in their microporosity (i.e., ∼ 4 nm); although, there is evidence for multi-modal μ-pore dimension due to the agglomeration of small subparticles. The initial fragmentation proceeds readily and uniformly to yield a multi-grain growth of sub-particle agglomerates. The surface of these sub-particle agglomerates is accessible through the void-space between growing catalyst/particle grains. Silica supported catalysts exhibit a network of porosity from meso- to micro-pores. These catalysts fragment progressively from the larger to the smaller meso-pores following the filling of the available pore space with growing polymer. Since this fragmentation is progressive and is dictated by pore filling, the surface area and pore volume can decrease rapidly. In the extreme, these mechanisms result in both loss and retention of available surface area and pore volume. As the polymer grows these differences can result in uniform as well as non-uniform distributions of catalyst fragments within the growing polymer. However, the differences between the morphological mechanisms can depend on the conditions (pressure, temperature and gas phase v.s. slurry) of the polymerization process and, thus, no simple conclusions may be drawn that relate one catalyst system to a specific mechanism for the changes in morphology." @default.
- W2149042676 created "2016-06-24" @default.
- W2149042676 creator A5001709267 @default.
- W2149042676 creator A5007207364 @default.
- W2149042676 creator A5028513646 @default.
- W2149042676 creator A5047842949 @default.
- W2149042676 creator A5049151911 @default.
- W2149042676 creator A5058797697 @default.
- W2149042676 creator A5082892923 @default.
- W2149042676 date "1993-01-01" @default.
- W2149042676 modified "2023-10-11" @default.
- W2149042676 title "New Insight into The Changing Catalyst/Polymer Morphology During Olefin Polymerization: The Application of Tomography" @default.
- W2149042676 cites W2008957274 @default.
- W2149042676 cites W2130129615 @default.
- W2149042676 doi "https://doi.org/10.1016/s0167-2991(08)64544-9" @default.
- W2149042676 hasPublicationYear "1993" @default.
- W2149042676 type Work @default.
- W2149042676 sameAs 2149042676 @default.
- W2149042676 citedByCount "11" @default.
- W2149042676 countsByYear W21490426762015 @default.
- W2149042676 countsByYear W21490426762018 @default.
- W2149042676 crossrefType "book-chapter" @default.
- W2149042676 hasAuthorship W2149042676A5001709267 @default.
- W2149042676 hasAuthorship W2149042676A5007207364 @default.
- W2149042676 hasAuthorship W2149042676A5028513646 @default.
- W2149042676 hasAuthorship W2149042676A5047842949 @default.
- W2149042676 hasAuthorship W2149042676A5049151911 @default.
- W2149042676 hasAuthorship W2149042676A5058797697 @default.
- W2149042676 hasAuthorship W2149042676A5082892923 @default.
- W2149042676 hasConcept C127413603 @default.
- W2149042676 hasConcept C129955480 @default.
- W2149042676 hasConcept C159985019 @default.
- W2149042676 hasConcept C161790260 @default.
- W2149042676 hasConcept C178394782 @default.
- W2149042676 hasConcept C178790620 @default.
- W2149042676 hasConcept C185592680 @default.
- W2149042676 hasConcept C192562407 @default.
- W2149042676 hasConcept C2777973245 @default.
- W2149042676 hasConcept C2779751980 @default.
- W2149042676 hasConcept C2779772531 @default.
- W2149042676 hasConcept C42360764 @default.
- W2149042676 hasConcept C44228677 @default.
- W2149042676 hasConcept C521977710 @default.
- W2149042676 hasConcept C6648577 @default.
- W2149042676 hasConceptScore W2149042676C127413603 @default.
- W2149042676 hasConceptScore W2149042676C129955480 @default.
- W2149042676 hasConceptScore W2149042676C159985019 @default.
- W2149042676 hasConceptScore W2149042676C161790260 @default.
- W2149042676 hasConceptScore W2149042676C178394782 @default.
- W2149042676 hasConceptScore W2149042676C178790620 @default.
- W2149042676 hasConceptScore W2149042676C185592680 @default.
- W2149042676 hasConceptScore W2149042676C192562407 @default.
- W2149042676 hasConceptScore W2149042676C2777973245 @default.
- W2149042676 hasConceptScore W2149042676C2779751980 @default.
- W2149042676 hasConceptScore W2149042676C2779772531 @default.
- W2149042676 hasConceptScore W2149042676C42360764 @default.
- W2149042676 hasConceptScore W2149042676C44228677 @default.
- W2149042676 hasConceptScore W2149042676C521977710 @default.
- W2149042676 hasConceptScore W2149042676C6648577 @default.
- W2149042676 hasLocation W21490426761 @default.
- W2149042676 hasOpenAccess W2149042676 @default.
- W2149042676 hasPrimaryLocation W21490426761 @default.
- W2149042676 hasRelatedWork W2013220512 @default.
- W2149042676 hasRelatedWork W2027747659 @default.
- W2149042676 hasRelatedWork W2054874291 @default.
- W2149042676 hasRelatedWork W2060958413 @default.
- W2149042676 hasRelatedWork W2113706127 @default.
- W2149042676 hasRelatedWork W2332692659 @default.
- W2149042676 hasRelatedWork W3014724149 @default.
- W2149042676 hasRelatedWork W3183835656 @default.
- W2149042676 hasRelatedWork W4285403451 @default.
- W2149042676 hasRelatedWork W4386013278 @default.
- W2149042676 isParatext "false" @default.
- W2149042676 isRetracted "false" @default.
- W2149042676 magId "2149042676" @default.
- W2149042676 workType "book-chapter" @default.