LASQ-block-PDMS: Novel Copolymers Combining Ladder and Coil Structures, Exhibiting Remarkable Hardness and De-wetting Characteristics
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Authors
Hosseini, Seyedsaber
Date
2024-10-02
Type
thesis
Language
eng
Keyword
organic-inorganic hybrid coatings , diblock copolymers , sol-gel polymerization , UV-curable , nanoindentation , hardness , water repellency
Alternative Title
Abstract
Ladder-like polysilsesquioxane (LASQ)-block-poly(dimethylsiloxane) (PDMS) copolymers, featuring various LASQ fractions, are synthesized through a four-step procedure. This study introduces the synthesis of hybrid LASQ-block-PDMS copolymers with ladder-coil structures, showcasing high hardness and liquid repellency, not previously synthesized. The synthesis of these copolymers allows for the integration of exceptional characteristics from each polymer. Leveraging the benefits of organic-inorganic hybrid polymers, such as high thermal stability, excellent mechanical properties, optical transparency, chemical resistance, and potential biocompatibility, motivates the creation of hybrid copolymers. The initial block consists of ladder-like polysilsesquioxanes, derived from a 72-hour sol−gel chemistry process involving 2-(3,4-epoxycyclohexyl)-ethyltrimethoxysilane (ECTMS). Subsequent dimethylvinylsilylation, trimethylsilylation, and hydrosilylation techniques are employed to introduce the second block, which comprises monohydride-terminated poly(dimethylsiloxane) (PDMS-H). This work presents copolymerization results and data characterization for the synthesized copolymers with varying LASQ and PDMS weight fractions. In this work by considering substantial properties of each polymer such as excellent mechanical properties of LASQs with UV-curable functional groups and thermal stability with low surface energy of PDMS and high optical clarity, we synthesized LASQ-b-PDMS copolymers to create products that leverage the exceptional characteristics of each block.
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ProQuest PhD and Master's Theses International Dissemination Agreement
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This publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.