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Glass Transition Behavior, Interfacial Confinement Effects, and Sustainability in Thin Film and Bulk Polymer Materials
Glass Transition Behavior, Interfacial Confinement Effects, and Sustainability in Thin Film and Bulk Polymer Materials
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211151414
- ISBN
- 9798382762500
- DDC
- 660
- 저자명
- Wang, Tong.
- 서명/저자
- Glass Transition Behavior, Interfacial Confinement Effects, and Sustainability in Thin Film and Bulk Polymer Materials
- 발행사항
- [Sl] : Northwestern University, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 237 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 85-11, Section: B.
- 주기사항
- Advisor: Torkelson, John M.
- 학위논문주기
- Thesis (Ph.D.)--Northwestern University, 2024.
- 초록/해제
- 요약Interfaces play a pivotal role in dictating the properties of polymers, particularly at the polymer/air interface, where polymer dynamics undergo significant enhancement, leading to deviations from bulk responses in key properties like the glass transition temperature (Tg). Understanding and eliminating the nanoconfinement behavior, exemplified by the Tg-confinement effect observed in polystyrene thin films, have been a longstanding challenge in polymer physics. Considerable research efforts have been dedicated to elucidating and fine-tuning this phenomenon across various polymer films. Moreover, achieving tunability in the Tg-confinement effect is crucial for various applications, but existing techniques often require complex synthesis processes or the incorporation of small molecules. This dissertation introduces a novel method to eliminate the Tg-confinement effect in polystyrene and poly(4-methylstyrene) films by synthesizing random copolymers containing only 2-3 mol% of 2-ethylhexyl acrylate with styrene or 4-methylstyrene, which only requires simple free radical synthesis. It is demonstrated that bulk fragility and the fragility-confinement effect are dominant factors influencing the Tg-confinement effect, indicating that the low level of 2-ethylhexyl acrylate units can alter the chain packing efficiency, potentially via the interdigitation of 2-ethylhexyl groups.The healing of polymer/polymer interfaces is imperative for enhancing the self-healing capability and reprocessability of polymer materials. Most reported autonomous self-healing polymers require embedding specially designed functional groups or unique polymer chain arrangements, limiting their applicability. Addressing these challenges, this dissertation presents a new approach to achieving autonomous self-healing copolymer materials solely based on commodity monomers while offering a wider range of workable compositions. Additionally, traditional polymer network materials, due to their crosslinked structure, have been challenging to recycle or reprocess. Covalent adaptable network (CAN) materials, capable of being reprocessed or reshaped under specific stimuli while retaining strong mechanical properties, offer a solution. This dissertation introduces the first chain-growth CAN crosslinked by thionourethane linkages, demonstrating rapid reprocessability, full self-healing capability, and resistance to creep.Through comprehensive investigations and innovative approaches, this dissertation contributes to advancing our understanding and utilization of polymer interfaces and self-healing materials, offering promising avenues for enhancing the performance and sustainability of polymer materials in various applications.
- 일반주제명
- Chemical engineering
- 일반주제명
- Materials science
- 일반주제명
- Polymer chemistry
- 키워드
- Fragility
- 키워드
- Glass transition
- 키워드
- Polymer
- 키워드
- Self-healing
- 기타저자
- Northwestern University Chemical and Biological Engineering
- 기본자료저록
- Dissertations Abstracts International. 85-11B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■040 ▼aMiAaPQ▼cMiAaPQ
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■1001 ▼aWang, Tong.▼0(orcid)0000-0003-2289-2452
■24510▼aGlass Transition Behavior, Interfacial Confinement Effects, and Sustainability in Thin Film and Bulk Polymer Materials
■260 ▼a[Sl]▼bNorthwestern University▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a237 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 85-11, Section: B.
■500 ▼aAdvisor: Torkelson, John M.
■5021 ▼aThesis (Ph.D.)--Northwestern University, 2024.
■520 ▼aInterfaces play a pivotal role in dictating the properties of polymers, particularly at the polymer/air interface, where polymer dynamics undergo significant enhancement, leading to deviations from bulk responses in key properties like the glass transition temperature (Tg). Understanding and eliminating the nanoconfinement behavior, exemplified by the Tg-confinement effect observed in polystyrene thin films, have been a longstanding challenge in polymer physics. Considerable research efforts have been dedicated to elucidating and fine-tuning this phenomenon across various polymer films. Moreover, achieving tunability in the Tg-confinement effect is crucial for various applications, but existing techniques often require complex synthesis processes or the incorporation of small molecules. This dissertation introduces a novel method to eliminate the Tg-confinement effect in polystyrene and poly(4-methylstyrene) films by synthesizing random copolymers containing only 2-3 mol% of 2-ethylhexyl acrylate with styrene or 4-methylstyrene, which only requires simple free radical synthesis. It is demonstrated that bulk fragility and the fragility-confinement effect are dominant factors influencing the Tg-confinement effect, indicating that the low level of 2-ethylhexyl acrylate units can alter the chain packing efficiency, potentially via the interdigitation of 2-ethylhexyl groups.The healing of polymer/polymer interfaces is imperative for enhancing the self-healing capability and reprocessability of polymer materials. Most reported autonomous self-healing polymers require embedding specially designed functional groups or unique polymer chain arrangements, limiting their applicability. Addressing these challenges, this dissertation presents a new approach to achieving autonomous self-healing copolymer materials solely based on commodity monomers while offering a wider range of workable compositions. Additionally, traditional polymer network materials, due to their crosslinked structure, have been challenging to recycle or reprocess. Covalent adaptable network (CAN) materials, capable of being reprocessed or reshaped under specific stimuli while retaining strong mechanical properties, offer a solution. This dissertation introduces the first chain-growth CAN crosslinked by thionourethane linkages, demonstrating rapid reprocessability, full self-healing capability, and resistance to creep.Through comprehensive investigations and innovative approaches, this dissertation contributes to advancing our understanding and utilization of polymer interfaces and self-healing materials, offering promising avenues for enhancing the performance and sustainability of polymer materials in various applications.
■590 ▼aSchool code: 0163.
■650 4▼aChemical engineering
■650 4▼aMaterials science
■650 4▼aPolymer chemistry
■653 ▼aConfinement effect
■653 ▼aCovalent adaptable network
■653 ▼aFragility
■653 ▼aGlass transition
■653 ▼aPolymer
■653 ▼aSelf-healing
■690 ▼a0542
■690 ▼a0794
■690 ▼a0495
■71020▼aNorthwestern University▼bChemical and Biological Engineering.
■7730 ▼tDissertations Abstracts International▼g85-11B.
■790 ▼a0163
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17161566▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
