End-Group Functionalized Poly(α-olefinates) as Modular Building Blocks

Simple item page
dc.contributor.advisorSita, Lawrence R.en_US
dc.contributor.authorThomas, Tessy S.en_US
dc.contributor.departmentChemistryen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2017-01-24T06:35:40Z
dc.date.available2017-01-24T06:35:40Z
dc.date.issued2016en_US
dc.description.abstractThe development of living coordination chain transfer polymerization (LCCTP) has provided a viable path to practical and scalable bulk quantities of structurally well-defined polyolefins that are further characterized by having tunable molecular weight, narrow polydispersity and end-group moieties through the functionalization of the Zn(polymeryl)2 intermediate. These low molecular weight, atactic poly(α-olefinates) are attractive non-polar building blocks for new types of self-assembling polyolefin materials with tunable occupied volumes and lengths. In the present work, the investigation of self-assembled morphology manipulation through tunable occupied volume required a model α-olefin. Living coordinative group-transfer polymerization techniques were employed to determine the viability of low molecular weight, atactic poly(α-olefinates) (X-PAOs) as building blocks with bulky pendent groups. Application of these X-PAOs for the synthesis and self-assembly of high χ, low N amphiphilic diblock copolymers demonstrated the ability to manipulate the morphology of the thin film nanostructures through variation in occupied volume of the X-PAO domain. The resulting materials proved the combination of X-PAOs and polyester blocks provided a high enough χ in order to demonstrate self-assembly with an N as low as 50 monomer units while maintaining sub-20 nm domain spacings. It was of significant interest to develop a higher χ, lower N system to achieve sub-10 nm domain spacings. As a result a novel system using sugar-hybrid-PAO conjugates was developed. This system also demonstrated that variation in occupied volume of the X-PAO domain could influence thin-film morphology. The sugar-hybrid-PAO conjugates also demonstrated the ability to self-assemble in solution and encapsulate hydrophobic molecules. The sugar-hybrid-PAO conjugates proved to be a highly versatile system that has simplified the polysaccharide/synthetic block copolymer designs that have been previously used in the literature to obtain sub-10 nm domain spacings. The ability to generate hydrophobic building blocks using LCCTP has opened up the possibility of further investigations of new, advanced self-assembling materials and applications thanks to these readily-available X-PAOs modular building blocks.en_US
dc.identifierhttps://doi.org/10.13016/M2DV68
dc.identifier.urihttp://hdl.handle.net/1903/18956
dc.language.isoenen_US
dc.subject.pqcontrolledChemistryen_US
dc.subject.pqcontrolledPolymer chemistryen_US
dc.subject.pqcontrolledMaterials Scienceen_US
dc.subject.pquncontrolledClick Chemistryen_US
dc.subject.pquncontrolledLiving Polymerizationen_US
dc.subject.pquncontrolledPolyolefinsen_US
dc.subject.pquncontrolledSelf-Assemblyen_US
dc.subject.pquncontrolledSugarsen_US
dc.subject.pquncontrolledSurfactantsen_US
dc.titleEnd-Group Functionalized Poly(α-olefinates) as Modular Building Blocksen_US
dc.typeDissertationen_US

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Thomas_umd_0117E_17612.pdf
Size:
167.48 MB
Format:
Adobe Portable Document Format
Download

Collections

UMD Theses and Dissertations
Chemistry & Biochemistry Theses and Dissertations