Surface-Initiated PET-RAFT via the Z-Group Approach

Seera, Sai Dileep Kumar; Pester, Christian W.

doi:10.1021/acspolymersau.3c00028

Cited by 7 publications

(3 citation statements)

References 67 publications

(105 reference statements)

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“…53 However, grafting density can be determined according to the literature using methods such as gravimetric analysis 54 or swelling of polymer brushes. 55 Those methods are sophisticated and convenient for curved microspheres or planar substrates such as Si wafers. 54,55 Due to the soft elastomeric nature of our stamp, the implementation of similar methods to determine brush properties on our stamp is, however, complex.…”

Section: Resultsmentioning

confidence: 99%

“…55 Those methods are sophisticated and convenient for curved microspheres or planar substrates such as Si wafers. 54,55 Due to the soft elastomeric nature of our stamp, the implementation of similar methods to determine brush properties on our stamp is, however, complex. To probe the characteristics of the formed polymer brushes on our stamp, however, contact angle measurements were thus conducted.…”

Section: Resultsmentioning

confidence: 99%

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Polymer brush-assisted microcontact printing: using a tailor-made polydimethylsiloxane (PDMS) stamp for precise patterning of rough surfaces

Pallab,

Reinicke,

Gurke

et al. 2024

Polym. Chem.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Polymer brush-assisted microcontact printing: using a tailor-made polydimethylsiloxane (PDMS) stamp for precise patterning of rough surfaces

Pallab,

Reinicke,

Gurke

et al. 2024

Polym. Chem.

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“…Despite these chemical advances, fundamental questions remain regarding some principal polymer brush parameters, which are experimentally challenging to obtain . For example, polymer brush molecular weights and grafting densities are often related through models with limited precision and applicability.…”

Section: Introductionmentioning

confidence: 99%

Photolabile SI-PET-RAFT Initiators for Wavelength-Selective Grafting and De-grafting of Polymer Brushes

Hunter,

Bell,

Pester

2024

ACS Appl. Polym. Mater.

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Polymer brushes offer a wide array of applications in surface modification. While recent advances have made these chemistries more userfriendly, scientific questions about fundamental polymer properties often remain unanswered. For example, copolymer brush composition, chain end fidelity, and dispersity often remain prohibitively challenging to characterize. This conundrum produces a need for chemically precise pathways to evaluate polymer brushes. To this end, this contribution describes the synthesis of an o-nitrobenzyl-based photolabile initiator for surface-initiated reversible deactivation radical polymerization. The product can be immobilized on surfaces, enable growth of polymer brushes under visible light, and be cleaved under ultraviolet (UV) irradiation. Wavelength selectivity is confirmed using a combination of ellipsometry, tensiometry, and X-ray photoelectron spectroscopy, and patterning experiments indicate good spatial control over photocleaving. Finally, nuclear magnetic resonance spectroscopy indicates visibility of characteristic peaks for both chain ends after degrafting of the polymer brush.

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Separation of Surface Grafted Microparticles via Light and Temperature

Vasquez‐Muñoz,

Rohne,

Meier

et al. 2024

Small Science

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Separation of equally sized particles distinguished solely by interfacial properties remains a highly challenging task. Herein, a particle fractioning method is proposed, which is suitable to differentiate between polymer‐grafted microparticles that are equal in size. The separation relies on the combination of a pressure driven microfluidic flow, together with simultaneous light illumination and temperature control. Heating the solution forces thermo‐responsive surface grafts to undergo a volume phase transition and therefore locally changing the interfacial properties of the microparticles. Light illumination induces the phoretic/osmotic activity of the microparticles and lifts them into a higher plane, where hovering particles experience a different shear stress proportional to the height. The light‐induced hovering height depends on the interfacial properties, and this complex interaction leads to different movements of the microparticles as a function of their surface grafting. The concepts are visualized in experimental studies, where the complex physical principle provides a simple method for fractioning a binary mixture with at least one thermo‐responsive polymer graft.

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Surface-Initiated PET-RAFT via the Z-Group Approach

Cited by 7 publications

References 67 publications

Polymer brush-assisted microcontact printing: using a tailor-made polydimethylsiloxane (PDMS) stamp for precise patterning of rough surfaces

Polymer brush-assisted microcontact printing: using a tailor-made polydimethylsiloxane (PDMS) stamp for precise patterning of rough surfaces

Photolabile SI-PET-RAFT Initiators for Wavelength-Selective Grafting and De-grafting of Polymer Brushes

Separation of Surface Grafted Microparticles via Light and Temperature

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