Synthesis and self-aggregated nanostructures of hydrogen-bonding polydimethylsiloxane
| العنوان: | Synthesis and self-aggregated nanostructures of hydrogen-bonding polydimethylsiloxane |
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| المؤلفون: | Senbin Chen, Jintao Zhu, Bengao Zhu, Yanggui Wu, Huiying Wang, Bijing Xiong, Wolfgang H. Binder |
| المصدر: | Polymer Chemistry |
| بيانات النشر: | Royal Society of Chemistry (RSC), 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | chemistry.chemical_classification, Nanostructure, Materials science, Polymers and Plastics, Polydimethylsiloxane, Small-angle X-ray scattering, Hydrogen bond, Organic Chemistry, Bioengineering, 02 engineering and technology, Polymer, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Biochemistry, Micelle, 0104 chemical sciences, Supramolecular polymers, chemistry.chemical_compound, End-group, chemistry, Chemical engineering, 0210 nano-technology |
| الوصف: | Gaining control over assembled nanostructures is an important aspect in nanotechnology and materials. Compared to specific directional interactions, self-aggregation of clusters driven by the forces of hydrogen-bonding (H-bonding) polymers, constitute a novel and simple strategy toward the tuning of nanostructures. In this work, we first demonstrate the precise synthesis of tailored polydimethylsiloxane (PDMS) at their α-ends bearing a series of H-bonding moieties (e.g., barbiturate (Ba), 2,4,6-triaminopyrimidine (TAP) and Hamilton wedge (HW)), using a robust copper(I)-catalyzed azide–alkyne cycloaddition (CuAAC) reaction. Complete end group functionalization is proven by NMR and matrix-assisted laser desorption/ionization time of flight mass spectrometry (MALDI-MS) methods. Self-aggregated H-bonds are indeed formed in the melt state from the obtained H-bonding PDMS, evidenced by temperature dependent solid-state 1H MAS NMR. Subsequent small angle X-ray scattering (SAXS) studies unveil a profound picture of nanostructures, including lamellae (LAM), hexagonally packed cylinders (HPC), body-centered cubic spheres (BCC) and disordered micelles (DIM). We found that these morphologies are influenced by the molecular weight of the PDMS (1200, 5800 and 11 300 g mol−1), as well as by the nature of H-bonding moieties (e.g., Ba, TAP, HW), proving that both the immiscibility parameter and the volume fraction between nonpolar PDMS and polar H-bonding moieties determine the final structures. Moreover, we also demonstrate a thermally reversible order–disorder transition (ODT) in the observed nanostructures, induced by the H-bonding self-aggregation as observed by temperature-dependent SAXS investigations. The strategy to engineer nanostructures to form the cluster and aggregation of H-bonding polymers is significant, providing new insights to control the supramolecular polymer chain organization and phase separation effects. |
| تدمد: | 1759-9962 1759-9954 |
| DOI: | 10.1039/d1py00513h |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::21103e3b54d89b5e1cd77d3dc995db46 https://doi.org/10.1039/d1py00513h |
| Rights: | CLOSED |
| رقم الانضمام: | edsair.doi.dedup.....21103e3b54d89b5e1cd77d3dc995db46 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 17599962 17599954 |
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| DOI: | 10.1039/d1py00513h |