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Large Polymers That Behave Like Small Polymers
Large Polymers That Behave Like Small Polymers
Large Polymers That Behave Like Small Polymers

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20250211152807
ISBN  
9798384094920
DDC  
540
저자명  
Pomfret, Meredith.
서명/저자  
Large Polymers That Behave Like Small Polymers
발행사항  
[Sl] : University of Washington, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
179 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-03, Section: B.
주기사항  
Advisor: Golder, Matthew.
학위논문주기  
Thesis (Ph.D.)--University of Washington, 2024.
초록/해제  
요약Polymer architecture dictates the physical properties and therefore the function of a material. Consequently, structural changes in the polymer backbone have drastic influences on macromolecular physical properties. For example, rigid monomer units create stiff polymer chains with excellent thermal and mechanical properties, at the expense of processability. Meanwhile, flexible monomer units like ethylenes and siloxanes create soft, flexible plastics at the expense of thermal and mechanical robustness. Synthesizing polymers with novel architectures can overcome these challenges by creating materials with a unique set of properties and thus eliminating the trade-off between chain flexibility and desirable macromolecular physical properties. Detailed within this thesis are our reports of modulating backbone architecture of linear polymers using fluxional monomer units. Additionally, we explore the synthesis of cyclic polymer architectures using ring expansion metathesis polymerization (REMP) through catalyst design and mechanistic studies. First, we demonstrate that small molecule pericyclic rearrangements in bullvalene monomer units creates stochastic kinks in an otherwise rigid polymer backbone. This unique chain architecture results in lower hydrodynamic volumes and decreased thermal transitions. Next, we investigate a different, but also compact, polymer architecture by investigating the REMP mechanism and the role of chain transfer events in molecular weight evolution and size of the cyclic polymer products. Finally, we investigate the structure-function relationship of REMP catalysts by modifying tether length and studying the resulting polymerization profiles. Tether length was found to have a significant effect on REMP rate, providing further understanding on these processes. Through these studies, we elucidate valuable information on REMP polymerization profiles and catalyst behavior, providing insight for future optimization of the synthesis of cyclic polymers. 
일반주제명  
Chemistry
일반주제명  
Engineering
일반주제명  
Materials science
일반주제명  
Polymer chemistry
키워드  
Cyclic polymers
키워드  
Polymer architecture
키워드  
Physical properties
키워드  
REMP catalysts
키워드  
Mechanical properties
기타저자  
University of Washington Chemistry
기본자료저록  
Dissertations Abstracts International. 86-03B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■1001  ▼aPomfret,  Meredith.
■24510▼aLarge  Polymers  That  Behave  Like  Small  Polymers
■260    ▼a[Sl]▼bUniversity  of  Washington▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a179  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-03,  Section:  B.
■500    ▼aAdvisor:  Golder,  Matthew.
■5021  ▼aThesis  (Ph.D.)--University  of  Washington,  2024.
■520    ▼aPolymer  architecture  dictates  the  physical  properties  and  therefore  the  function  of  a  material.  Consequently,  structural  changes  in  the  polymer  backbone  have  drastic  influences  on  macromolecular  physical  properties.  For  example,  rigid  monomer  units  create  stiff  polymer  chains  with  excellent  thermal  and  mechanical  properties,  at  the  expense  of  processability.  Meanwhile,  flexible  monomer  units  like  ethylenes  and  siloxanes  create  soft,  flexible  plastics  at  the  expense  of  thermal  and  mechanical  robustness.  Synthesizing  polymers  with  novel  architectures  can  overcome  these  challenges  by  creating  materials  with  a  unique  set  of  properties  and  thus  eliminating  the  trade-off  between  chain  flexibility  and  desirable  macromolecular  physical  properties.  Detailed  within  this  thesis  are  our  reports  of  modulating  backbone  architecture  of  linear  polymers  using  fluxional  monomer  units.  Additionally,  we  explore  the  synthesis  of  cyclic  polymer  architectures  using  ring  expansion  metathesis  polymerization  (REMP)  through  catalyst  design  and  mechanistic  studies.  First,  we  demonstrate  that  small  molecule  pericyclic  rearrangements  in  bullvalene  monomer  units  creates  stochastic  kinks  in  an  otherwise  rigid  polymer  backbone.  This  unique  chain  architecture  results  in  lower  hydrodynamic  volumes  and  decreased  thermal  transitions.  Next,  we investigate  a  different,  but  also  compact,  polymer  architecture  by  investigating  the  REMP  mechanism  and  the  role  of  chain  transfer  events  in  molecular  weight  evolution  and  size  of  the  cyclic  polymer  products.  Finally,  we  investigate  the  structure-function  relationship  of  REMP  catalysts  by  modifying  tether  length  and  studying  the  resulting  polymerization  profiles.  Tether  length  was  found  to  have  a  significant  effect  on  REMP  rate,  providing  further  understanding  on  these  processes.  Through  these  studies,  we  elucidate  valuable  information  on  REMP  polymerization  profiles  and  catalyst  behavior,  providing  insight  for  future  optimization  of  the  synthesis  of  cyclic  polymers. 
■590    ▼aSchool  code:  0250.
■650  4▼aChemistry
■650  4▼aEngineering
■650  4▼aMaterials  science
■650  4▼aPolymer  chemistry
■653    ▼aCyclic  polymers
■653    ▼aPolymer  architecture
■653    ▼aPhysical  properties
■653    ▼aREMP  catalysts
■653    ▼aMechanical  properties
■690    ▼a0485
■690    ▼a0794
■690    ▼a0537
■690    ▼a0495
■71020▼aUniversity  of  Washington▼bChemistry.
■7730  ▼tDissertations  Abstracts  International▼g86-03B.
■790    ▼a0250
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17163901▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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