Controlling polymer properties through the shape of the molecular-weight distribution

Nature Reviews Materials, Journal Year: 2019, Volume and Issue: 4(12), P. 761 - 774

Published: Oct. 1, 2019

Language: Английский

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Tailoring polymer dispersity and shape of molecular weight distributions: methods and applications

Chemical Science, Journal Year: 2019, Volume and Issue: 10(38), P. 8724 - 8734

Published: Jan. 1, 2019

The width and shape of molecular weight distributions can significantly affect the properties polymeric materials thus are key parameters to control. This mini-review aims critically summarise recent approaches developed tailor highlights strengths limitations each technique. Special emphasis will also be given applications where tuning distribution has been used as a strategy not only enhance polymer but increase fundamental understanding behind complex mechanisms phenomena.

Language: Английский

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Tuning Dispersity by Photoinduced Atom Transfer Radical Polymerisation: Monomodal Distributions with ppm Copper Concentration

Angewandte Chemie International Edition, Journal Year: 2019, Volume and Issue: 58(38), P. 13323 - 13328

Published: July 10, 2019

Dispersity significantly affects the properties of polymers. However, current methods for controlling polymer dispersity are limited to bimodal molecular weight distributions, adulterated chains, or low end-group fidelity and rely on feeding reagents, flow-based, multicomponent systems. To overcome these limitations, we report a simple batch system whereby photoinduced atom transfer radical polymerisation is exploited as convenient versatile technique control both homopolymers block copolymers. By varying concentration copper complex, wide range monomodal distributions can be obtained (Đ=1.05-1.75). In all cases, high was confirmed by MALDI-ToF-MS exemplified efficient copolymer formation (monomodal, Đ=1.1-1.5). Importantly, our approach utilises ppm levels (as 4 ppm), tolerant oxygen exhibits perfect temporal control, representing major step forward in tuning various applications.

Language: Английский

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Tailoring Polymer Dispersity by RAFT Polymerization: A Versatile Approach

Chem, Journal Year: 2020, Volume and Issue: 6(6), P. 1340 - 1352

Published: May 25, 2020

Language: Английский

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Precision polymer synthesis by controlled radical polymerization: Fusing the progress from polymer chemistry and reaction engineering

Progress in Polymer Science, Journal Year: 2022, Volume and Issue: 130, P. 101555 - 101555

Published: May 7, 2022

Language: Английский

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Copolymers with Controlled Molecular Weight Distributions and Compositional Gradients through Flow Polymerization

Macromolecules, Journal Year: 2018, Volume and Issue: 51(12), P. 4553 - 4563

Published: June 7, 2018

We report a novel semicontinuous method for producing polymer mixtures with tailored molecular weight distributions (MWDs) and chemical compositions. In contrast to recent methods disclosed the production of MWDs, current approach allows MWD be at any point in multistep process. Optimization photoflow polymerization process has been performed, where fractions variable compositions can produced independently processed downstream. This independent processing complex tedious operations significantly simplified structure manipulated by varying conditions. To illustrate versatility our approach, we prepared low dispersity block copolymer composition gradients through PET-RAFT polymerization, using facile one-pass flow technique.

Language: Английский

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General route to design polymer molecular weight distributions through flow chemistry

Nature Communications, Journal Year: 2020, Volume and Issue: 11(1)

Published: June 18, 2020

Abstract The properties of a polymer are known to be intrinsically related its molecular weight distribution (MWD); however, previous methodologies MWD control do not use design and result in arbitrary shaped MWDs. Here we report precise synthesis protocol for producing targeted with simple use, chemistry agnostic computer-controlled tubular flow reactor. To support the development this protocol, constructed general reactor rules by combining fluid mechanical principles, polymerization kinetics, experiments. ring opening lactide, anionic styrene, metathesis used as model polymerizations develop synthesize profiles. derivation mathematical enables quantitative prediction experimental results, provides tool explore limits any protocol.

Language: Английский

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Controlling the Shape of Molecular Weight Distributions in Coordination Polymerization and Its Impact on Physical Properties

Journal of the American Chemical Society, Journal Year: 2019, Volume and Issue: 142(3), P. 1443 - 1448

Published: Dec. 27, 2019

High-density polyethylene (HDPE) is utilized in a multitude of commercial products worldwide due to its broad spectrum physical properties and low production costs. Molecular weight dispersity (Đ) are known affect the tensile rheological HDPE, but little about influence molecular distribution (MWD) shape on these properties. In this work, we investigate matter through temporal regulation initiation living coordination–insertion polymerization ethylene. This method provides precise control over MWD which, turn, offers systematic study HDPE. Through testing, observe difference complex viscosity shear thinning with opposite skew. However, testing reveals that skew does not impact strain at break, signifying ability HDPE processing without compromising material strength.

Language: Английский

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Concurrent control over sequence and dispersity in multiblock copolymers

Nature Chemistry, Journal Year: 2021, Volume and Issue: 14(3), P. 304 - 312

Published: Nov. 29, 2021

Language: Английский

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Tailoring polymer dispersity by mixing chain transfer agents in PET-RAFT polymerization

Polymer Chemistry, Journal Year: 2020, Volume and Issue: 11(31), P. 4968 - 4972

Published: Jan. 1, 2020

Here we report a simple and versatile batch methodology to tailor polymer dispersity utilizing PET-RAFT polymerization.

Language: Английский

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