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Elucidating the Interfacial Molecular Interaction Mechanisms of Silicone Adhesive, Polymer Degradation and Polymer Bio-Applications Using Advanced Spectroscopy /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Elucidating the Interfacial Molecular Interaction Mechanisms of Silicone Adhesive, Polymer Degradation and Polymer Bio-Applications Using Advanced Spectroscopy /Ting Lin.
Author:	Lin, Ting,
Description:	1 electronic resource (195 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
Notes:	Advisors: Chen, Zhan Committee members: Lahann, Joerg; Pena-Francesch, Abdon; Tuteja, Anish.
Contained By:	Dissertations Abstracts International85-12B.
Subject:	Materials science.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31348935
ISBN:	9798382739168

Elucidating the Interfacial Molecular Interaction Mechanisms of Silicone Adhesive, Polymer Degradation and Polymer Bio-Applications Using Advanced Spectroscopy /
Lin, Ting,

Elucidating the Interfacial Molecular Interaction Mechanisms of Silicone Adhesive, Polymer Degradation and Polymer Bio-Applications Using Advanced Spectroscopy /Ting Lin. - 1 electronic resource (195 pages)

Source: Dissertations Abstracts International, Volume: 85-12, Section: B.

In the past, SFG research has primarily focused on simple model systems. This thesis highlights the potential of using SFG to study buried polymer interfaces of practically applicable and commercial polymers, such as silicone adhesives, developing a tool to investigate real-world interfaces relevant to many applications. Also, this thesis provides an in-depth study on silicone/polymer buried solid/solid interface like first time probing the interfacial chemical reactions in situ and orientation analysis during curing. The SFG methodologies developed in this thesis are widely applicable for many polymer systems.High-performance adhesives become increasingly important across diverse applications due to the demand of energy efficiency. Adhesion is mediated by interfacial molecules and occurs at buried interfaces. Optimizing and controlling the adhesion often relies on understanding the interfacial molecular structure. However, it has always been challenging in both academia and industry to investigate such buried interfaces nondestructively. In this thesis, sum frequency generation (SFG) vibrational spectroscopy was applied to study molecular structures of buried interfaces to understand molecular mechanisms of polymer adhesion in situ.High-temperature vulcanized (HTV) silicone is one of the most commonly used silicone and the HTV silicone mentioned in this work is mainly based on the hydrosilylation curing chemistry, which is the addition reaction of Si-H and Si-vinyl group catalyzed by platinum catalyst. SFG was applied to study buried interfaces of HTV silicone composite systems and the results were correlated to adhesion measurement data to understand the molecular adhesion mechanisms. Silicone matrices with different added compositions such as adhesion promoters, fillers, and catalysts were investigated to understand the effects of various additives on the buried interfacial structure. The added filler appeared to reduce the interfacial segregation of the adhesion promoter at the silicone/substrate interface, while the adhesion catalyst can facilitate the interfacial segregation of adhesion promoter to enhance adhesion. SFG was also utilized to probe the interfacial chemical reaction between HTV silicone and polar polymer substrate in situ. This is the first time to directly monitor this process at buried interfaces of commercial silicone adhesive system. It illustrates that manipulating segregation and functionality of adhesion promoter, interfacial reaction, and surface composition at buried interfaces can substantially amplify silicone adhesion.Besides HTV silicone, room temperature vulcanized (RTV) silicone based on condensation curing was also investigated by SFG. Here the RTV silicone indicates the silicone involving the formation of crosslinked networks through chemical reactions between silanol groups and other reactive groups in formulated products such as alkoxysilanes or acetoxysilanes.This thesis also investigates the molecular interactions between biological molecules and polymer surfaces in situ. SFG was used to study molecular interactions between polystyrene and various peptides with different numbers of aromatic amino acids by monitoring the orientation changes of polystyrene phenyl groups and alpha-helical peptides during the interactions. It was found that the charge-charge interaction was the dominant interaction at the interface, which outperformed the π-π interaction.Polyethylene weathering mechanism was investigated and such research was included in this thesis as well. With global plastic production exceeding 300 million tons per year since 2014, plastics accumulating in the environment are increasing at an alarming rate. Globally, only a small portion of plastic waste is recycled. A comprehensive study on plastic degradation mechanisms can offer essential knowledge to ultimately understand the impact of the degraded materials, helping the development of strategies to mitigate such impact. Changes in the structure of polyethylene after exposure to UV irradiation depend on the exposure time and the polyethylene characteristics. This study employed multiple analytical tools and offered a systematic understanding of polyethylene degradation. This approach provides knowledge on how plastics behave in the environment and their degradation mechanisms.

English

ISBN: 9798382739168Subjects--Topical Terms:

221779
Materials science.
Subjects--Index Terms:

Non-linear optics

Elucidating the Interfacial Molecular Interaction Mechanisms of Silicone Adhesive, Polymer Degradation and Polymer Bio-Applications Using Advanced Spectroscopy /
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