| dc.identifier.uri | http://hdl.handle.net/11401/76313 | |
| dc.description.sponsorship | This work is sponsored by the Stony Brook University Graduate School in compliance with the requirements for completion of degree. | en_US |
| dc.format | Monograph | |
| dc.format.medium | Electronic Resource | en_US |
| dc.language.iso | en_US | |
| dc.publisher | The Graduate School, Stony Brook University: Stony Brook, NY. | |
| dc.type | Dissertation | |
| dcterms.abstract | In this thesis, by combining various surface and interface characterization techniques, I report the structures, dynamics, and physical and mechanical properties of polymeric materials at the solid-polymer melt interface. Following the introduction, in Chapter 2, I show the experimental evidence of irreversibly adsorbed polymer layers (several nanometers thick) on silicon substrates regardless of the magnitude of attractive polymer-solid interactions. Interestingly, the adsorbed layers are composed of an inner, higher density region (~ 2 nm in thickness regardless of molecular weight (M<sub>w<sub>) with a more flattened chain conformation (" flattened layer" ) and an outer bulk-like density region whose thickness increases with M<sub>w<sub> (" loosely adsorbed layer" )). In Chapter 3, I show the impact of the adsorbed layer on the local viscosity of single polystyrene (PS) thin films, overcoming the effects of a surface mobile layer at the air/polymer interface. In Chapter 4, I reveal the novel adhesive properties of the two adsorbed PS layers (i.e., flattened layer and loosely adsorbed layer), which have contrasting roles in thermodynamic stability of a polymer film when prepared on the two adsorbed layers. In chapter 5, I further examine the swelling behavior of the adsorbed PS layer in supercritical CO<sub>2<sub>. The neutron reflectivity results demonstrate that the loosely adsorbed PS layer, which is found to be immobile even at temperatures far above the glass transition temperature, swells in CO<sub>2<sub>. Further interdiffusion experiments using bilayers of PS and deuterated PS in CO<sub>2<sub> indicate that swollen PS thin films have a mobility gradient in the direction normal to the film surface associated with the adsorbed layer. In Chapter 6, I exhibit work related to polymer structures and dynamics at the polymer-" curved" solid surface. For this purpose, I use polybutadiene (PB) chains bound to carbon black (CB) filler surfaces, known as " bound rubber" in the rubber industry, by extracting with solvent leaching. Small-angle neutron scattering and neutron spin echo experiments for the " bound rubber-coated" CB fillers dispersed in deuterated toluene reveal similar heterogeneous chain conformations on the curved surface: flattened chains constitute the inner unswollen region of the bound rubber layer and loosely adsorbed polymer chains form the outer swollen region. In addition, results show that the outer loosely adsorbed chains display similar collective relaxation to the " breathing" dynamics that have been reported in end-grafted polymer chains in a good solvent. | |
| dcterms.available | 2017-09-20T16:50:00Z | |
| dcterms.contributor | Sokolov, Jonathan | en_US |
| dcterms.contributor | Koga, Tadanori | en_US |
| dcterms.contributor | Venkatesh, T.A. | en_US |
| dcterms.contributor | Fukuto, Masafumi. | en_US |
| dcterms.creator | Jiang, Naisheng | |
| dcterms.dateAccepted | 2017-09-20T16:50:00Z | |
| dcterms.dateSubmitted | 2017-09-20T16:50:00Z | |
| dcterms.description | Department of Materials Science and Engineering. | en_US |
| dcterms.extent | 189 pg. | en_US |
| dcterms.format | Monograph | |
| dcterms.format | Application/PDF | en_US |
| dcterms.identifier | http://hdl.handle.net/11401/76313 | |
| dcterms.issued | 2015-08-01 | |
| dcterms.language | en_US | |
| dcterms.provenance | Made available in DSpace on 2017-09-20T16:50:00Z (GMT). No. of bitstreams: 1
Jiang_grad.sunysb_0771E_12060.pdf: 3148749 bytes, checksum: 1afb8bc6dbfe195e598438a5e416780e (MD5)
Previous issue date: 2014 | en |
| dcterms.publisher | The Graduate School, Stony Brook University: Stony Brook, NY. | |
| dcterms.subject | Materials Science | |
| dcterms.subject | adsorption, interfaces, nanoconfinment, physical properties, polymer thin film, structures | |
| dcterms.title | Structure-Property Relationships of Polymeric Materials at the Solid-Polymer Melt Interfaces | |
| dcterms.type | Dissertation | |
