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Glass Transition Behavior, Interfaci...

Wang, Tong.

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Glass Transition Behavior, Interfacial Confinement Effects, and Sustainability in Thin Film and Bulk Polymer Materials.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Glass Transition Behavior, Interfacial Confinement Effects, and Sustainability in Thin Film and Bulk Polymer Materials./
作者:	Wang, Tong.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2024,
面頁冊數:	237 p.
附註:	Source: Dissertations Abstracts International, Volume: 85-11, Section: B.
Contained By:	Dissertations Abstracts International85-11B.
標題:	Chemical engineering. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31293134
ISBN:	9798382762500

Glass Transition Behavior, Interfacial Confinement Effects, and Sustainability in Thin Film and Bulk Polymer Materials.
Wang, Tong.

Glass Transition Behavior, Interfacial Confinement Effects, and Sustainability in Thin Film and Bulk Polymer Materials. - Ann Arbor : ProQuest Dissertations & Theses, 2024 - 237 p.

Source: Dissertations Abstracts International, Volume: 85-11, Section: B.

Thesis (Ph.D.)--Northwestern University, 2024.

Interfaces 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.

ISBN: 9798382762500Subjects--Topical Terms:

560457
Chemical engineering.
Subjects--Index Terms:

Confinement effect

Glass Transition Behavior, Interfacial Confinement Effects, and Sustainability in Thin Film and Bulk Polymer Materials.
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502 $a Thesis (Ph.D.)--Northwestern University, 2024.
520 $a Interfaces 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.
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650 4 $a Materials science. $3 543314
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653 $a Covalent adaptable network
653 $a Fragility
653 $a Glass transition
653 $a Polymer
653 $a Self-healing
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690 $a 0794
690 $a 0495
710 2 $a Northwestern University. $b Chemical and Biological Engineering. $3 1023594
773 0 $t Dissertations Abstracts International $g 85-11B.
790 $a 0163
791 $a Ph.D.
792 $a 2024
793 $a English
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