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Macromolecular Rapid Communications

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https://www.readbyqxmd.com/read/30240071/tough-stimuli-responsive-and-biocompatible-hydrogels-with-very-high-water-content
#1
Tianqi Liu, Shuai Lu, Xin Peng, Chen Jiao, Jianan Zhang, Mei Han, Huiliang Wang
Some marine creatures like jellyfish have gel-like bodies consisting mostly of water (above 95 wt%). Yet, their gel-like bodies still show quite good mechanical properties and can respond to external stimuli. Artificial hydrogels with very high water content are generally extremely weak, and hence their practical applications are strongly limited. Inspired by jellyfish, tough and biocompatible poly(vinyl alcohol)/sodium polyacrylate (PVA/PAANa) hydrogels with very high equilibrium water content (98.23-99.58 wt%) are developed...
September 21, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/30240066/thermally-activated-delayed-fluorescent-polymers-structures-properties-and-applications-in-oled-devices
#2
Qiang Wei, Ziyi Ge, Brigitte Voit
Thermally activated delayed fluorescent (TADF) polymers are promising emitting materials to realize highly efficient, large-scale, and low-cost organic light-emitting diodes (OLEDs) since they exhibit various advantages such as heavy-metal-free structures, 100% theoretical internal quantum efficiency, and ease of large-area fabrication through solution process. At present, TADF polymers are still limited in category and complicated in preparation, which hinders their proceeding into industrial application. Besides, a still-too-low quantum efficiency poses a challenge for TADF-polymer-based OLEDs...
September 21, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/30238698/polymer-synthesis-with-more-than-one-form-of-living-polymerization-method
#3
REVIEW
Xiaofeng Guo, Bonnie Choi, Anchao Feng, San H Thang
Controlled radical polymerization (CRP) or controlled/living radical polymerization has revolutionized the polymer industry as a tool for the preparation of a wide variety of polymers. This process enables the preparation of polymers with good control of molecular weight, narrow polydispersity, and a range of architectures including block and graft copolymers, star polymers, and other functional polymers. The mechanistic transformation reaction provides a great opportunity to tune chemical and physical properties of copolymers...
September 20, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/30221798/an-ab-2-type-supramolecular-hyperbranched-polymer-based-on-pillar-5-arene-host-guest-recognition-construction-and-its-ph-responsiveness
#4
Li Shao, Zhihua Zhang, Bin Hua
Supramolecular hyperbranched polymers not only possess the polymeric properties of hyperbranched polymers but also obtain additional stimuli-responsiveness due to the dynamic properties of non-covalent interactions. Herein, a novel supramolecular hyperbranched polymer constructed by an AB2 -type copillar[5]arene is reported. NMR spectroscopy, scanning electron microscopy, and viscosity experiments are utilized to characterize the self-aggregate process of the AB2 monomers. Interestingly, the supramolecular hyperbranched polymer exhibits pH-responsiveness...
September 17, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/30221423/asymmetric-copolymers-synthesis-properties-and-applications-of-gradient-and-other-partially-segregated-copolymers
#5
REVIEW
Junliang Zhang, Barbara Farias-Mancilla, Mathias Destarac, Ulrich S Schubert, Daniel J Keddie, Carlos Guerrero-Sanchez, Simon Harrisson
Asymmetric copolymers are a class of materials with intriguing properties. They can be defined by a distribution of monomers within the polymer chain that is neither strictly segregated, as in the case of block copolymers, nor evenly distributed throughout each chain, as in the case of statistical copolymers. This definition includes gradient copolymers as well as block copolymers that contain segments of statistical copolymer. In this review, different methods to synthesize asymmetric copolymers are first discussed...
September 16, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/30216588/polymerization-induced-self-assembly-for-artificial-biology-opportunities-and-challenges
#6
REVIEW
Gong Cheng, Juan Pérez-Mercader
The study of the origin of life and current undergoing efforts to produce artificial chemical systems mimicking the behavior of natural living systems have emerged as a hot topic at the interfaces among disciplines. In these two problems, the spontaneous generation of free-energy gradients by means of material interfaces plays a central role and, until recently, hindered progress. Polymerization-induced self-assembly (PISA) is a promising strategy for the formation of polymeric vesicles from a homogeneous mixture which, in the form of artificial biology, may reflect and inform the generation of vesicular structures in primitive Earth...
September 14, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/30216584/cyclodextrin-based-macromolecular-systems-as-cholesterol-mopping-therapeutic-agents-in-niemann-pick-disease-type-c
#7
Antonino Puglisi, Yusuf Yagci
Over the last decade, cyclodextrins (CDs) have gained considerable attention as a potential therapeutic intervention in the treatment of the rare genetic condition Niemann-Pick type C disease (NPC). However, the oligosaccharide in its monomeric form suffers from serious side effects, especially from a pharmacokinetic and biodistribution standpoint. CD-based macromolecular systems hold great promise to overcome such limitations and might provide an improved therapeutic approach in reducing cholesterol accumulation in NPC...
September 14, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/30207618/tuning-of-structural-colors-like-a-chameleon-enabled-by-shape-memory-polymers
#8
Senta Schauer, Jeremy J Baumberg, Hendrik Hölscher, Stoyan K Smoukov
Nature often uses structuring of materials for coloration rather than incorporating dye molecules, since single-construction materials are capable of producing any vivid visible color in plants and insects. By precisely engineering features that diffract or scatter light, more recently, humans have created similarly intense non-fading colors. Stretchable polymer opals have emerged as a single material which can dynamically shift across the whole visible spectrum using structural colors, by temporary stretching or compression...
September 12, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/30199142/c%C3%AF-h-activation-as-a-shortcut-to-conjugated-polymer-synthesis
#9
J Terence Blaskovits, Mario Leclerc
Direct (hetero)arylation polymerization exploits the palladium-catalyzed activation of aromatic CH bonds for the atom-economical synthesis of conjugated polymers for a wide range of applications. This account outlines how direct arylation methodologies overcome many of the limitations of contemporary polymerization techniques at both the research and production scale, and explains how monomer design and reaction conditions must be tailored to ensure high polymer molecular weight, yield, and structural integrity...
September 10, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/30199132/sulfur-polymers-meet-poly-ionic-liquid-s-bringing-new-properties-to-both-polymer-families
#10
Iñaki Gomez, Asier Fdz De Anastro, Olatz Leonet, Jose Alberto Blazquez, Hans-Jürgen Grande, Jeffrey Pyun, David Mecerreyes
Sulfur-containing polymers and poly(ionic liquid)s are emerging macromolecules with unique properties and applications. This article shows the first integration of these two polymer families, leading to materials with a unique combination of properties. The synthetic strategy toward sulfur-containing poly(ionic liquid)s involves first the copolymerization of elemental sulfur with 4-vinylbenzyl chloride and subsequent quaternization of the alkyl chloride group using N-methyl imidazole. The synthetic pathway is completed by the anion exchange reaction of the poly(sulfur-co-4-vinylbenzyl imidazolium chloride) by a sulphonamide anion...
September 10, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/30199116/spion-decorated-nanofibers-by-raft-mediated-free-radical-emulsion-polymerization-induced-self-assembly
#11
Duc Nguyen, Vien Huynh, Nguyen Pham, Binh Pham, Algirdas Serelis, Tim Davey, Chris Such, Brian Hawkett
RAFT-mediated free-radical emulsion polymerization is successfully used to synthesize polystyrene nanofibers using triblock amphiphilic macro-RAFT copolymers as stabilizers. The polymerization is under RAFT control, producing various morphologies from spherical particles, nanofibers, nanoplatelets, and polymer vesicles. Optimum conditions are established for the synthesis of predominantly negatively charged polymer nanofibers. Superparamagnetic iron oxide nanoparticles (SPION)-decorated nanofibers are formed by simple mixing of the SPIONs with the fibers at an appropriate pH...
September 10, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/30199109/high-t-g-and-thermo-oxidatively-stable-thermosetting-polyimides-derived-from-a-carborane-containing-diamine
#12
Yuane Wu, Gong Chen, Chen Feng, Jiping Yang
To provide high-temperature polyimide matrix resins, novel carborane-containing thermosetting polyimides are presented. First, the low-viscosity carborane-containing imide oligomers are synthesized using newly designed 1-(3-amino-4-tolyl)-2-(4-aminophenyl)-o-carborane and aromatic dianhydride as monomers, 4-phenylethynyl phthalic anhydride as the end-capping reagent. Followed by thermal curing, the resulting polyimides show high Tg (≥500 °C) and above 92.1% char yield at 800 °C both in nitrogen and air atmosphere due to the incorporation of the bulky carborane cages...
September 10, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/30198165/polymer-nanospheres-with-hydrophobic-surface-groups-as-supramolecular-building-blocks-produced-by-aqueous-pisa
#13
Bastian Ebeling, Khaled Belal, François Stoffelbach, Patrice Woisel, Muriel Lansalot, Franck D'Agosto
A robust and straightforward synthesis of waterborne polymer nanospheres bearing the supramolecular association unit dialkoxynapthalene at their surface is presented using polymerization-induced self-assembly (PISA). A RAFT agent bearing this unit is first employed to produce poly(acrylic acid) chains, which are then chain-extended with styrene (S) to spontaneously form the nano-objects via RAFT aqueous emulsion polymerization. The particular challenge posed by the dialkoxynapthalene hydrophobicity can be overcome by the use of PISA and the deprotonation of the poly(acrylic acid)...
September 10, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/30179281/plant-oil-based-polyamides-and-polyurethanes-toward-sustainable-nitrogen-containing-thermoplastic-materials
#14
Michael A R Meier
Plant oils and their derived fatty acids are a highly valuable renewable resource for polymer science. In this review, the use of this renewable resource for the synthesis of nitrogen-containing step-growth polymers, that is, polyamides and polyurethanes, is described. The focus is on the accessible structures of monomers and polymers and thus also the obtainable polymer properties. More importantly, the sustainability of the approaches is discussed and compared to each other where possible, also giving suggestions for future developments...
September 4, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/30176085/emission-and-emissive-mechanism-of-nonaromatic-oxygen-clusters
#15
Yunzhong Wang, Xin Bin, Xiaohong Chen, Shuyuan Zheng, Yongming Zhang, Wang Zhang Yuan
Nonaromatic luminophores without remarkable conjugates have aroused great attention. Their emission mechanism, however, remains an open question. Meanwhile, previous studies generally focus on aliphatic amine and/or carbonyl-containing systems; those with merely oxygen moieties (i.e., ether, hydroxyl) are scarcely touched. Recently, the clustering-triggered emission (CTE) mechanism is proposed to rationalize the emission of nonconventional luminophores, according to which compounds bearing purely oxygen moieties can also be emissive...
September 3, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/30176080/synthesis-of-light-responsive-pyrene-based-polymer-nanoparticles-via-polymerization-induced-self-assembly
#16
Ali Bagheri, Cyrille Boyer, May Lim
The use of an in situ, one-pot polymerization-induced self-assembly method to synthesize light-responsive pyrene-containing nanoparticles is reported. The strategy is based on the chain extension of a hydrophilic macromolecular chain transfer agent, poly(oligo(ethylene glycol) methyl ether methacrylate), using a light-responsive monomer, 1-pyrenemethyl methacrylate (PyMA), via a reversible addition-fragmentation chain transfer dispersion polymerization; yielding nanoparticles of various morphologies (spherical micelles and worm-like micelles)...
September 3, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/30176076/enzyme-responsive-polymer-nanoparticles-via-ring-opening-metathesis-polymerization-induced-self-assembly
#17
Daniel B Wright, Matthew P Thompson, Mollie A Touve, Andrea S Carlini, Nathan C Gianneschi
Open-to-air aqueous-phase ring-opening metathesis polymerization-induced self-assembly (ROMPISA) is reported for forming well-defined peptide polymer nanoparticles at room temperature and with high solids concentrations (10 w/w%). For these materials, ROMPISA is shown to provide control over molecular weight with high conversion while open-to-air. Moreover, these peptide polymer nanoparticles can spontaneously rearrange into larger aggregate scaffolds in the presence of the proteolytic enzyme, thermolysin. This work demonstrates the robust nature of ROMPISA, highlighted here for the preparation of stimuli-responsive nanostructures in one pot, in air...
September 3, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/30175483/polymerization-induced-self-assembly-under-compressed-co-2-control-of-morphology-using-a-co-2-responsive-macroraft-agent
#18
Dewen Zhou, Rhiannon P Kuchel, Siming Dong, Frank P Lucien, Sébastien Perrier, Per B Zetterlund
Polymerization-induced self-assembly of 2-hydroxypropyl methacrylate is conducted in water and water/MeOH using a CO2 -responsive macroRAFT agent in the form of a statistical copolymer comprising N,N-diethylaminoethyl methacrylate (DEAEMA) and poly(ethylene glycol) methyl ether methacrylate (M n  = 475 g mol-1 ). Pressurization with CO2 leads to protonation of DEAEMA units within the stabilizer block, thereby offering a means of adjusting the charge density of the coronal layer. It is demonstrated that a wide range of tunable particle morphologies are accessible by simply varying the CO2 pressure during polymerization in the range of 10-45 bar...
September 2, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/30151849/stimuli-responsive-supramolecular-gels-constructed-by-hierarchical-self-assembly-based-on-metal-ligand-coordination-and-host-guest-recognition
#19
Yin-Hsuan Lee, Lipeng He, Yi-Tsu Chan
Metal-ligand coordination and host-guest recognition are introduced into the hybrid system in order to prepare supramolecular gels, which can be responsive to multiple external stimuli such as metal ions, competitive guest/host molecules, and oxidants. To this end, the triangular terpyridine-based metallocycles functionalized with 1-adamantyl and ferrocenyl groups are constructed through self-assembly, and further used as supramolecular cross-linkers for gelation of β-CD-containing copolymers. Their gelation and stimuli-response tests are discussed, and an application of the metallotriangles for serving as supramolecular glue is demonstrated through a series of adhesion experiments...
August 27, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/30144192/weakening-the-aggregations-of-polymer-chains-toward-efficient-non-fullerene-polymer-solar-cells
#20
Kaili Zhang, Deyu Liu, Yaqian Zhong, Yonghai Li, Liangmin Yu, Feng Li, Mingliang Sun, Renqiang Yang
The 2D asymmetric benzodithiophene (BDT) unit is used as a donor unit to construct one new polymer PBDTBDD-Th with benzo[1,2-c:4,5-c']dithiophene-4,8-dione (BDD) as acceptor building block. In comparison to the polymer PBDTsTh-BDD with a side chain containing a sulfur atom, the devices based on PBDTBDD-Th/ITIC show better performance due to the introduction of carbon atoms in the side chain, which could weaken the self-aggregations of polymer chains. As a result, the devices based on PBDTBDD-Th/ITIC blends yield power conversion efficiencies (PCEs) over 10%, much higher than those based on PBDTsTh-BDD/ITIC blends (7...
August 24, 2018: Macromolecular Rapid Communications
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