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Macromolecular Rapid Communications

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https://www.readbyqxmd.com/read/28921741/chalcogen-atom-annulated-perylene-diimide-trimers-for-highly-efficient-nonfullerene-polymer-solar-cells
#1
Yuwei Duan, Xiaopeng Xu, Ying Li, Zuojia Li, Qiang Peng
This communication reports the synthesis of two novel chalcogen-atom-annulated perylene diimide (PDI) trimers with twisted structures, TriPDI-S and TriPDI-Se, for efficient nonfullerene polymer solar cells. TriPDI-Se exhibits more compact molecular arrangement due to the stronger intermolecular interactions induced by the selenium atom. This selenium annulation endows TriPDI-Se with improved absorption and crystallinity in its blend film. The resulting devices exhibit enhanced Jsc of 17.15 mA cm(-2) and fill factor (FF) of 66...
September 15, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28921736/graphene-oxide-go-as-stabilizer-for-preparing-chirally-helical-polyacetylene-go-hybrid-microspheres-via-suspension-polymerization
#2
Jun Li, Jinrui Deng, Weifei Li, Kai Pan, Jianping Deng
Hybrid materials consisting of polymers and graphene are gathering ever-growing interest. This article reports a novel methodology for preparing chirally helical polyacetylene/graphene hybrid microspheres (MPs) via suspension polymerization in which graphene oxide (GO) or alkynylated GO (MGO) serves as a sole stabilizer. Such polymerizations show remarkable advantages in circumventing the difficulties in usual suspension polymerizations and especially in directly providing clean hybrid MPs. Scanning electron microscopy (SEM), Raman spectra, and electron dispersive spectroscopy indicate that graphene sheets cover the MPs through physical interaction (GO) or covalent bonds (MGO)...
September 15, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28921705/green-tea-makes-polyphenol-nanoparticles-with-radical-scavenging-activities
#3
Siying Xiang, Peng Yang, Hao Guo, Shu Zhang, Xiaokang Zhang, Fang Zhu, Yiwen Li
The constant demand for functional nanomaterials from natural biomass polymers usually requires new "green" synthetic strategies without using any foreign additives. Here, the green fabrication of a series of polyphenol nanoparticles (PNs) only from green tea extraction compounds is reported (i.e., tea polyphenols and theophylline). It is found that the nanoparticle formation process involves covalent copolymerization of monomers, as well as noncovalent self-assembly pathways. Additionally, the resulting PNs exhibit better free-radical scavenging activities compared with similar-sized, polydopamine-based synthetic melanin nanoparticles...
September 15, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28921703/poly-vinylidene-fluoride-co-chlorotrifluoroethylene-modification-via-organocatalyzed-atom-transfer-radical-polymerization
#4
Xin Hu, Yajun Zhang, Guopeng Cui, Ning Zhu, Kai Guo
To address the challenge of metal contamination, a "graft from" approach via organocatalyzed atom transfer radical polymerization (O-ATRP) is developed to synthesize poly(vinylidene fluoride-co-chlorotrifluoroethylene) (P(VDF-co-CTFE)) graft copolymers. N-phenylphenothiazine is utilized as a model organic photoredox catalyst for catalyzing the (co)polymerization of methyl methacrylate (MMA), methacrylate (MA), and n-butyl acrylate (BA). By employing this technique, high temporal control of polymerization and graft content are achieved...
September 15, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28910508/immobilizing-organic-based-molecular-switches-into-metal-organic-frameworks-a-promising-strategy-for-switching-in-solid-state
#5
REVIEW
Bo Gui, Yi Meng, Yang Xie, Ke Du, Andrew C-H Sue, Cheng Wang
Organic-based molecular switches (OMS) are essential components for the ultimate miniaturization of nanoscale electronics and devices. For practical applications, it is often necessary for OMS to be incorporated into functional solid-state materials. However, the switching characteristics of OMS in solution are usually not transferrable to the solid state, presumably because of spatial confinement or inefficient conversion in densely packed solid phase. A promising way to circumvent this issue is harboring the functional OMS within the robust and porous environment of metal-organic frameworks (MOFs) as their organic components...
September 14, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28910504/ca-2-induced-crosslinking-of-aie-active-polyarylene-ether-nitrile-into-fluorescent-polymeric-nanoparticles-for-cellular-bioimaging
#6
Pan Wang, Kun Jia, Xuefei Zhou, Xiaotian Guan, Lianhui Wang, Yuan Tian, Chunhui Wu, Xiaobo Liu
Biocompatible fluorescent polymeric nanoparticles (FPNs) are promising luminescent probes in cellular bioimaging, while the fabrication of high-quantum-yield FPN using nonconjugated heterochain polymers derived from step-growth polymerization is still in its infancy. Herein, the nonconjugated polyarylene ether nitrile (PEN) is endowed with aggregation-induced emission (AIE) feature by incorporation of an AIEgen named of 1,2-di(4-hydroxyphenyl)-1,2-diphenylethene into macromolecular backbone. Furthermore, the AIE-active PEN is crosslinked into water soluble fluorescent nanospheres showing good biocompatibility and strong emission ≈480 nm with a quantum yield of 21% in the presence of Ca(2+) , which allows the successful bioimaging of cancer cells...
September 14, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28902961/photoluminescence-of-diphenylalanine-peptide-nano-microstructures-from-mechanisms-to-applications
#7
REVIEW
Zhixing Gan, Hao Xu
Diphenylalanine (Phe-Phe, FF) molecules, which can self-assemble into highly ordered nano/microstructures, have increasingly aroused intense interests due to their special optical properties. In this review, recent advances in photoluminescence (PL) of supramolecular architectures of FF-based peptide and the underlying mechanisms are highlighted. Mainly deep ultraviolet emission at around 285 nm and/or blue emission at ≈450 nm are observed in various FF peptide structures and its derivatives, which are primarily interpreted by quantum confinement effects, shallow radiative traps, and electron delocalization via hydrogen bonds in β-sheet structures...
September 13, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28898505/in-situ-synthesis-of-imidazolium-crosslinked-ionogels-via-debus-radziszewski-reaction-based-on-pamam-dendrimers-in-imidazolium-ionic-liquid
#8
Xiaomeng Zhao, Shufei Guo, Hao Li, Jiahang Liu, Xinxin Liu, Hongzan Song
This study reports a remarkably facile method to synthesize novel ionogels with imidazolium cycle crosslinks based on polyamidoamine (PAMAM) dendrimers via one-pot, modified Debus-Radziszewski reaction in ionic liquid 1-ethyl-3-methylimidazolium acetate ([EMIM][OAc]). High room temperature ionic conductivity (up to 6.8 mS cm(-1) ) is achieved, and more remarkably, it can still exceed 1 mS cm(-1) when the dendrimer content reached 70% because PAMAM dendrimers are completely amorphous with many cavities and the newly formed imidazolium crosslinks contains ions...
September 12, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28898498/recent-advances-in-processing-of-stereocomplex-type-polylactide
#9
REVIEW
Hongwei Bai, Shihao Deng, Dongyu Bai, Qin Zhang, Qiang Fu
Over the past two decades, biomass-derived and biodegradable polylactide (PLA) has sparked tremendous attention as a sustainable alternative to traditional petroleum-derived polymers for diverse applications. Unfortunately, the current applications of PLA have been mainly limited to biomedical and commodity fields, mostly because the poor heat resistance (resulting from low melting temperature) and hydrolysis stability make it hard to use as an engineering plastic. Stereocomplexation between enantiomeric poly(l-lactide) (PLLA) and poly(d-lactide) (PDLA) opens a new avenue toward PLA-based engineering plastics with improved properties...
September 12, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28895267/long-lived-supramolecular-helices-promoted-by-fluorinated-photoswitches
#10
He Huang, Tetiana Orlova, Benjamin Matt, Nathalie Katsonis
Chiral azobenzenes can be used as photoswitchable dopants to control supramolecular helices in liquid crystals. However, the lack of thermal stability of the cis-isomer precludes envisioning the generation of long-lived supramolecular helices with light. Here, this study demonstrates thermally stable and axially chiral azobenzene switches that can be used as chiral dopants to create supramolecular helices from (achiral) nematic liquid crystals. Their trans-to-cis photoisomerization leads to a variation of helical twisting power that reaches up to 60%, and the helical superstructure that is engineered with light displays a relaxation time that reaches tens of hours...
September 12, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28895266/sequence-independent-dna-nanogel-as-a-potential-drug-carrier
#11
Weiqi Zhang, Ching-Hsuan Tung
DNA nanostructures largely rely on pairing DNA bases; thus, sequence designing is required. Here, this study demonstrates a sequence-independent strategy to fabricate DNA nanogel (NG) inspired by cisplatin, a chemotherapeutic drug that acts as a DNA crosslinker. A simple heating and cooling of the genomic DNA extracts and cisplatin produces DNA NG with a size controlled by the heating time. Furthermore, the drug-loaded NG is formulated by spontaneously mixing DNA segments, cisplatin, and doxorubicin. The in vitro cell studies demonstrate that the doxorubicin-loaded NG alters the drug distribution in cells while its cytotoxic potential is well-maintained...
September 12, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28895259/control-of-head-tail-isomeric-structure-in-polyimide-and-isomerism-derived-difference-in-molecular-packing-and-properties
#12
Longbo Luo, Yu Dai, Yihao Yuan, Xu Wang, Xiangyang Liu
Two sequence isomeric poly(amic acid)s (PAAs) are successfully synthesized from 3,3',4,4'-biphenyltetracarboxylic dianhydride and unsymmetrical 5(6)-amino-2-(4-aminobenzene) benzimidazole (PABZ). The syntheses are based on the site-selective reactivity of head/tail amino groups of PABZ and solubility differences of PABZ in good solvent (dimethyl sulfoxide, DMSO) and poor solvent (N-methyl-2-pyrrolidone, NMP). The proton nuclear magnetic resonance ((1) H-NMR) results reveal that the content of head tail-head tail (HTHT) bonding units in PAA-DMSO (PAA synthesized in DMSO) is 37%, while this content increases to 54% in PAA-NMP (PAA synthesized in NMP)...
September 12, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28895251/taming-macromolecules-with-light-lessons-learned-from-vibrational-spectroscopy
#13
REVIEW
Jaana Vapaavuori, C Geraldine Bazuin, Christian Pellerin
Exciting new applications, from large-area nanopatterning and templating to soft light-powered robotics, are emerging from the fundamental research on light-triggered changes in macromolecular systems upon photoisomerization of azobenzene-based molecular photoswitches. The understanding of how the initial molecular-scale photoisomerization of azobenzene, a complex photochemical event in itself, is translated into the response of macromolecules and even into macroscopic-scale motion of illuminated azomaterials is an enormous task...
September 12, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28895250/co2-induced-morphological-transition-of-co-assemblies-from-block-random-segmented-polymers
#14
Hongyao Yin, Wei Wang, Meng Mu, Yujun Feng
The co-assembly process is an effective approach to construct hierarchically nanostructured soft materials, but morphological transition of co-assemblies upon external stimuli, particularly the "green" trigger CO2 , is not unraveled yet. Here, a segmented copolymer, poly(styrene)-block-poly[(4-vinyl pyridine)-random-((2-(diethylamino)ethyl methacrylate)] (P1), is used to co-assemble in the mixed solvent of dimethyl formamide and water with poly(ethylene oxide)-block-poly[(4-vinyl pyridine)-random-((2-(diethylamino)ethyl methacrylate)] (P2) and poly(ethylene oxide)-block-poly(acrylic acid) (P3), respectively...
September 12, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28895249/salt-responsive-morphologies-of-ssdna-based-triblock-polyelectrolytes-in-semi-dilute-regime-effect-of-volume-fractions-and-polyelectrolyte-length
#15
Nan K Li, Huihui Kuang, William H Fuss, Stefan Zauscher, Efrosini Kokkoli, Yaroslava G Yingling
A comprehensive study is reported on the effect of salt concentration, polyelectrolyte block length, and polymer concentration on the morphology and structural properties of nanoaggregates self-assembled from BAB single-strand DNA (ssDNA) triblock polynucleotides in which A represents polyelectrolyte blocks and B represents hydrophobic neutral blocks. A morphological phase diagram above the gelation point is developed as a function of solvent ionic strength and polyelectrolyte block length utilizing an implicit solvent ionic strength method for dissipative particle dynamics simulations...
September 12, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28895248/nano-star-shaped-polymers-for-drug-delivery-applications
#16
REVIEW
Da-Peng Yang, Ma Nwe Nwe Linn Oo, Gulam Roshan Deen, Zibiao Li, Xian Jun Loh
With the advancement of polymer engineering, complex star-shaped polymer architectures can be synthesized with ease, bringing about a host of unique properties and applications. The polymer arms can be functionalized with different chemical groups to fine-tune the response behavior or be endowed with targeting ligands or stimuli responsive moieties to control its physicochemical behavior and self-organization in solution. Rheological properties of these solutions can be modulated, which also facilitates the control of the diffusion of the drug from these star-based nanocarriers...
September 12, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28895243/controlling-complex-stability-in-photoresponsive-macromolecular-host-guest-systems-toward-reversible-capture-of-dna-by-cyclodextrin-vesicles
#17
Johanna Moratz, Lucas Stricker, Sabrina Engel, Bart Jan Ravoo
An effective and universal method for delivering structurally diverse biomolecules in vivo would greatly benefit modern drug therapy, but has yet to be discovered. Self-assembled supramolecular complexes containing vesicles of amphiphilic cyclodextrin and linker molecules with an azobenzene guest unit and a charged functionality have been established as nanoscale carriers for proteins and DNA, making use of multivalent electrostatic attraction. However, light-induced cargo release is only feasible up to a maximum net charge of the biomacromolecules...
September 12, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28895241/thermoresponsive-double-network-hydrogels-with-exceptional-compressive-mechanical-properties
#18
A Kristen Means, Daniel A Ehrhardt, Lauren V Whitney, Melissa A Grunlan
The utility of thermoresponsive hydrogels, such as those based on poly(N-isopropylacrylamide) (PNIPAAm), is severely limited by their deficient mechanical properties. In particular, the simultaneous achievement of high strength and stiffness remains unreported. In this work, a thermoresponsive hydrogel is prepared having the unique combination of ultrahigh compressive strength (≈23 MPa) and excellent compressive modulus (≈1.5 MPa). This is accomplished by employing a double network (DN) design comprised of a tightly crosslinked, highly negatively charged 1st network based on poly(2-acrylamido-2-methylpropane sulfonic acid (PAMPS) and a loosely crosslinked, zwitterionic 2nd network based on a copolymer of thermoresponsive NIPAAm and zwitterionic 2-(methacryloyloxy)ethyl]dimethyl-(3-sulfopropyl)ammonium hydroxide (MEDSAH)...
September 12, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28895240/thermally-reversible-and-irreversible-phase-transition-behaviors-in-poly-ethylene-oxide-ionic-liquid-mixtures
#19
Yunlei Chen, Yanhua Niu, Pengjian Gong, Zhilin Xiao, Guangxian Li
The irreversible and reversible phase transition behaviors during phase separation-recovery (heating-cooling) cycles for poly(ethylene oxide)/1-ethyl-3-methylimidazolium tetrafluoroborate ionic liquid (PEO/[EMIM][BF4 ]) mixtures with a lower critical solution temperature phase diagram are reported for the first time. The evident differential scanning calorimetry endothermic and exothermic peaks are observed during the heating-cooling scan cycles near the phase boundary, in which the large heat loss for samples below the critical composition (60 wt% PEO) and obvious downward shift of phase transition temperature for all the compositions between the first and second cycles are particularly attractive...
September 12, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28863248/controllable-microfluidic-fabrication-of-microstructured-materials-from-nonspherical-particles-to-helices
#20
Wei Wang, Xiao-Heng He, Mao-Jie Zhang, Meng-Jiao Tang, Rui Xie, Xiao-Jie Ju, Zhuang Liu, Liang-Yin Chu
This work reports on a facile and flexible strategy based on the deformation of encapsulated droplets in fiber-like polymeric matrices for template synthesis of controllable microstructured materials from nonspherical microparticles to complex 3D helices. Monodisperse droplets generated from microfluidics are encapsulated into crosslinked polymeric networks via an interfacial crosslinking reaction in microchannel to in situ produce the droplet-containing, fiber-like matrices. By stretching and twining the dried fiber-like matrices, the encapsulated droplets can be flexibly engineered into versatile shapes for template synthesis of controllable nonspherical microparticles and helices...
September 1, 2017: Macromolecular Rapid Communications
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