Matches in SemOpenAlex for { <https://semopenalex.org/work/W1492423010> ?p ?o ?g. }
Showing items 1 to 71 of
71
with 100 items per page.
- W1492423010 abstract "This project is concerned with the synthesis of Viscosity Modifiers (VMs) for use in gear box oils. The use of amines as precursors for initiators is also of interest due to their dispersant properties.Atom transfer radical polymerisation (ATRP) was used to prepare statistical copolymers of n-Butyl methacrylate and C12/15 methacrylate for use as VMs. These copolymers were first of a linear nature demonstrating that ATRP could be used to polymerise this monomer combination to give well defined polymers with a high degree of control.Thereafter, multi-functional initiators were used to synthesise core first stars with differing numbers of arms. Three, four, five and eight arm stars were successfully synthesised giving well defined polymers. These polymers were tested by Lubrizol for their viscometric properties. All were found to give significant improvements versus Lubrizol’s existing linear polymers in almost all respects.Although the core first stars gave a significant improvement in viscometric properties the costs of the core are relatively high for the application. Therefore the synthesis of arm first stars via ATRP was carried out. Design of experiment (DoE) was used to aid in the optimisation process and to interrelate any factors used in the design. The DoE process indicated two relationships between input factors, one of which was defined numerically. A range of polymers were synthesised on a larger scale for testing by Lubrizol for their viscometric properties. The polymers were found to have exceptional viscosity properties, compared to the baseline sample.The use of amines as precursors for initiators (forming amide initiators) was investigated. 4-Aminodiphenylamine (ADPA) was synthesised into an initiator suitable for ATRP and used in several polymerisations. It was found to have very low initiator efficiency. For this reason Single Electron Transfer Living Radical Polymerisation (SET-LRP) was employed to polymerise methyl acrylate from this initiator with near 100% initiator efficiency. A range of other amide initiators were also successfully used in polymerisations. A new solvent system for SET-LRP was also demonstrated. The addition of phenol to toluene promoted the disproportionation of Cu(I) allowing SETLRP to take place. Polymers were synthesised in this solvent mixture with high degrees of control over molecular weight with narrow Polydipersity indexs (PDI)." @default.
- W1492423010 created "2016-06-24" @default.
- W1492423010 creator A5023696637 @default.
- W1492423010 date "2008-12-01" @default.
- W1492423010 modified "2023-09-24" @default.
- W1492423010 title "The use of controlled radical techniques to form polymer architectures suitable for use as Gear Oil Viscosity Modifiers" @default.
- W1492423010 hasPublicationYear "2008" @default.
- W1492423010 type Work @default.
- W1492423010 sameAs 1492423010 @default.
- W1492423010 citedByCount "0" @default.
- W1492423010 crossrefType "dissertation" @default.
- W1492423010 hasAuthorship W1492423010A5023696637 @default.
- W1492423010 hasConcept C111998727 @default.
- W1492423010 hasConcept C120665830 @default.
- W1492423010 hasConcept C121332964 @default.
- W1492423010 hasConcept C127172972 @default.
- W1492423010 hasConcept C127413603 @default.
- W1492423010 hasConcept C132050475 @default.
- W1492423010 hasConcept C145889102 @default.
- W1492423010 hasConcept C150539798 @default.
- W1492423010 hasConcept C15920480 @default.
- W1492423010 hasConcept C159985019 @default.
- W1492423010 hasConcept C166940927 @default.
- W1492423010 hasConcept C177562468 @default.
- W1492423010 hasConcept C188027245 @default.
- W1492423010 hasConcept C192562407 @default.
- W1492423010 hasConcept C42360764 @default.
- W1492423010 hasConcept C521977710 @default.
- W1492423010 hasConceptScore W1492423010C111998727 @default.
- W1492423010 hasConceptScore W1492423010C120665830 @default.
- W1492423010 hasConceptScore W1492423010C121332964 @default.
- W1492423010 hasConceptScore W1492423010C127172972 @default.
- W1492423010 hasConceptScore W1492423010C127413603 @default.
- W1492423010 hasConceptScore W1492423010C132050475 @default.
- W1492423010 hasConceptScore W1492423010C145889102 @default.
- W1492423010 hasConceptScore W1492423010C150539798 @default.
- W1492423010 hasConceptScore W1492423010C15920480 @default.
- W1492423010 hasConceptScore W1492423010C159985019 @default.
- W1492423010 hasConceptScore W1492423010C166940927 @default.
- W1492423010 hasConceptScore W1492423010C177562468 @default.
- W1492423010 hasConceptScore W1492423010C188027245 @default.
- W1492423010 hasConceptScore W1492423010C192562407 @default.
- W1492423010 hasConceptScore W1492423010C42360764 @default.
- W1492423010 hasConceptScore W1492423010C521977710 @default.
- W1492423010 hasLocation W14924230101 @default.
- W1492423010 hasOpenAccess W1492423010 @default.
- W1492423010 hasPrimaryLocation W14924230101 @default.
- W1492423010 hasRelatedWork W1582494118 @default.
- W1492423010 hasRelatedWork W1858410409 @default.
- W1492423010 hasRelatedWork W1963565994 @default.
- W1492423010 hasRelatedWork W1984885441 @default.
- W1492423010 hasRelatedWork W2000216775 @default.
- W1492423010 hasRelatedWork W2008723734 @default.
- W1492423010 hasRelatedWork W2019862524 @default.
- W1492423010 hasRelatedWork W2021136512 @default.
- W1492423010 hasRelatedWork W2058570548 @default.
- W1492423010 hasRelatedWork W2088332407 @default.
- W1492423010 hasRelatedWork W2102823600 @default.
- W1492423010 hasRelatedWork W2309697927 @default.
- W1492423010 hasRelatedWork W2583320091 @default.
- W1492423010 hasRelatedWork W2729822032 @default.
- W1492423010 hasRelatedWork W2750673625 @default.
- W1492423010 hasRelatedWork W2886623608 @default.
- W1492423010 hasRelatedWork W2970537278 @default.
- W1492423010 hasRelatedWork W3199909965 @default.
- W1492423010 hasRelatedWork W2199269969 @default.
- W1492423010 hasRelatedWork W2495387522 @default.
- W1492423010 isParatext "false" @default.
- W1492423010 isRetracted "false" @default.
- W1492423010 magId "1492423010" @default.
- W1492423010 workType "dissertation" @default.