Controlling Dynamics of Associative Networks through Primary Chain Length DOI
Jacob J. Lessard, Kevin A. Stewart, Brent S. Sumerlin

и другие.

Macromolecules, Год журнала: 2022, Номер 55(22), С. 10052 - 10061

Опубликована: Ноя. 2, 2022

Dynamic networks couple the robust nature of thermosets with shapeability and recyclability thermoplastics. Though a wealth exchange chemistries can be leveraged to fabricate dynamic networks, reversibly cross-linked systems that are comprised primarily chains nonexchangeable backbones increase network complexity render flow behavior difficult predict. Here, we report polymethacrylate-based vitrimers prepared by cross-linking β-ketoester-containing polymers multifunctional amines demonstrate molecular weight dispersity primary tuned actively tailor dynamics resulting networks. Vitrimers similar composition cross-link density made from below well above entanglement exhibited distinct viscoelastic properties energies activation ranging 93 264 kJ/mol. Resistance creep increased dramatically increasing chain length. Finally, blending prepolymers skew Mn above/below Me was demonstrated, showing distinguishable effect prepolymer breadth skewness on vitrimer flow. Our results suggest tailoring chain-length distribution is viable strategy design materials predictable customizable behavior.

Язык: Английский

Reversible-deactivation radical polymerization (Controlled/living radical polymerization): From discovery to materials design and applications DOI
Nathaniel Corrigan, Kenward Jung, Graeme Moad

и другие.

Progress in Polymer Science, Год журнала: 2020, Номер 111, С. 101311 - 101311

Опубликована: Окт. 14, 2020

Язык: Английский

Процитировано

767

Chemical strategies to engineer hydrogels for cell culture DOI
Junzhe Lou, David Mooney

Nature Reviews Chemistry, Год журнала: 2022, Номер 6(10), С. 726 - 744

Опубликована: Авг. 30, 2022

Язык: Английский

Процитировано

218

Progress and Perspectives Beyond Traditional RAFT Polymerization DOI Creative Commons
Mitchell D. Nothling, Qiang Fu, Amin Reyhani

и другие.

Advanced Science, Год журнала: 2020, Номер 7(20)

Опубликована: Авг. 26, 2020

Abstract The development of advanced materials based on well‐defined polymeric architectures is proving to be a highly prosperous research direction across both industry and academia. Controlled radical polymerization techniques are receiving unprecedented attention, with reversible‐deactivation chain growth procedures now routinely leveraged prepare exquisitely precise polymer products. Reversible addition‐fragmentation transfer (RAFT) powerful protocol within this domain, where the unique chemistry thiocarbonylthio (TCT) compounds can harnessed control vinyl polymers. With intense recent focus RAFT, new strategies for initiation external have emerged that paving way preparing polymers demanding applications. In work, cutting‐edge innovations in RAFT opening up technique broader suite researchers explored. Emerging activating TCTs surveyed, which providing access into traditionally challenging environments polymerization. latest advances future perspectives applying RAFT‐derived also shared, goal convey rich potential an ever‐expanding range high‐performance

Язык: Английский

Процитировано

208

The rheology of direct and suspended extrusion bioprinting DOI Creative Commons
Megan E. Cooke, Derek H. Rosenzweig

APL Bioengineering, Год журнала: 2021, Номер 5(1)

Опубликована: Фев. 4, 2021

Bioprinting is a tool increasingly used in tissue engineering laboratories around the world. As an extension to classic engineering, it enables high levels of control over spatial deposition cells, materials, and other factors. It field with huge promise for production implantable tissues even organs, but availability functional bioinks barrier success. Extrusion bioprinting most commonly technique, where high-viscosity solutions materials cells are required ensure good shape fidelity printed construct. This contradictory hydrogels which generally low viscosity prior cross-linking cell viability, making them not directly translatable bioprinting. review provides overview important rheological parameters methods assess printability, as well effect bioink rheology on viability. Developments last five years formulations use suspended printing overcome limitations then discussed.

Язык: Английский

Процитировано

199

Role of External Field in Polymerization: Mechanism and Kinetics DOI
Yin‐Ning Zhou, Jin‐Jin Li, Yi‐Yang Wu

и другие.

Chemical Reviews, Год журнала: 2020, Номер 120(5), С. 2950 - 3048

Опубликована: Фев. 21, 2020

The past decades have witnessed an increasing interest in developing advanced polymerization techniques subjected to external fields. Various physical modulations, such as temperature, light, electricity, magnetic field, ultrasound, and microwave irradiation, are noninvasive means, having superb but distinct abilities regulate polymerizations terms of process intensification spatial temporal controls. Gas emerging regulator plays a distinctive role controlling resembles some cases. This review provides systematic overview seven types external-field-regulated polymerizations, ranging from chain-growth step-growth polymerization. A detailed account the relevant mechanism kinetics is provided better understand each field In addition, given crucial modeling simulation mechanisms investigation, model construction typical numerical methods used this well highlights interaction between experiment toward existing systems given. At end, limitations future perspectives for critically discussed. state-of-the-art research progress not only fundamental principles underlying also stimulates new development methods.

Язык: Английский

Процитировано

188

Atom Transfer Radical Polymerization: A Mechanistic Perspective DOI
Francesca Lorandi, Marco Fantin, Krzysztof Matyjaszewski

и другие.

Journal of the American Chemical Society, Год журнала: 2022, Номер 144(34), С. 15413 - 15430

Опубликована: Июль 26, 2022

Since its inception, atom transfer radical polymerization (ATRP) has seen continuous evolution in terms of the design catalyst and reaction conditions; today, it is one most useful techniques to prepare well-defined polymers as well notable examples catalysis polymer chemistry. This Perspective highlights fundamental advances ATRP reactions catalysts, focusing on crucial role that mechanistic studies play understanding, rationalizing, predicting outcomes. A critical summary traditional systems provided first; we then focus recent developments improve selectivity, control polymerizations via external stimuli, employ new photochemical or dual catalytic with an outlook future research directions open challenges.

Язык: Английский

Процитировано

165

Reversing RAFT Polymerization: Near-Quantitative Monomer Generation Via a Catalyst-Free Depolymerization Approach DOI Creative Commons
Hyun Suk Wang, Nghia P. Truong, Zhipeng Pei

и другие.

Journal of the American Chemical Society, Год журнала: 2022, Номер 144(10), С. 4678 - 4684

Опубликована: Фев. 25, 2022

The ability to reverse controlled radical polymerization and regenerate the monomer would be highly beneficial for both fundamental research applications, yet this has remained very challenging achieve. Herein, we report a near-quantitative (up 92%) catalyst-free depolymerization of various linear, bulky, cross-linked, functional polymethacrylates made by reversible addition-fragmentation chain-transfer (RAFT) polymerization. Key our approach is exploit high end-group fidelity RAFT polymers generate chain-end radicals at 120 °C. These trigger rapid unzipping conventional (e.g., poly(methyl methacrylate)) bulky poly(oligo(ethylene glycol) methyl ether polymers. Importantly, product can utilized either reconstruct linear polymer or create an entirely new insoluble gel that also subjected depolymerization. This work expands potential polymerization, pushes boundaries depolymerization, offers intriguing mechanistic aspects, enables applications.

Язык: Английский

Процитировано

163

Tailoring Polymer Dispersity by RAFT Polymerization: A Versatile Approach DOI Creative Commons
Richard Whitfield, Kostas Parkatzidis, Nghia P. Truong

и другие.

Chem, Год журнала: 2020, Номер 6(6), С. 1340 - 1352

Опубликована: Май 25, 2020

Язык: Английский

Процитировано

161

Photocontrolled RAFT polymerization: past, present, and future DOI Creative Commons

Yungyeong Lee,

Cyrille Boyer, Min Sang Kwon

и другие.

Chemical Society Reviews, Год журнала: 2023, Номер 52(9), С. 3035 - 3097

Опубликована: Янв. 1, 2023

In this review, we provide a brief history, progress, and applications, discuss the remaining challenges of photocontrolled reversible addition-fragmentation chain transfer (RAFT) polymerization (i.e., photoinduced electron/energy transfer-RAFT (PET-RAFT), photoiniferter, photomediated cationic RAFT polymerization). Among these, visible-light-driven has attracted particular attention in recent years due to its benefits, including low energy consumption safe reaction procedure. Moreover, incorporation visible-light photocatalysis conferred attractive features, such as spatiotemporal control oxygen tolerance; however, clear understanding mechanism not been completely provided. We also present research efforts elucidate mechanisms with aid quantum chemical calculations combined experimental evidence. This review offers an insight into better design systems for desired applications helps realize full potential both academic- industrial-scale applications.

Язык: Английский

Процитировано

144

Precision polymer synthesis by controlled radical polymerization: Fusing the progress from polymer chemistry and reaction engineering DOI Open Access
Yin‐Ning Zhou, Jin‐Jin Li, Tiantian Wang

и другие.

Progress in Polymer Science, Год журнала: 2022, Номер 130, С. 101555 - 101555

Опубликована: Май 7, 2022

Язык: Английский

Процитировано

113