The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A new class of yolk-shell structured precious metal@microporous polymer nanoparticles has been successfully developed. The polymer shells obtained by hypercrosslinking present well-developed permanent microporosity, controllable thickness, and good mechanical properties, and thus can be utilized to protect the precious metal yolks including Au and Ag nanoparticles from aggregation and inactivation...
Percec-type substituted benzyl alcohol mini-dendrons as new hydrophobic end-cappers can effectively improve the thickening performance of hydrophobically modified ethoxylated urethanes (HEURs) in aqueous solution. To demonstrate the effects of substituted structure of Percec-type mini-dendritic end groups on aggregation and rheological properties of HEURs in aqueous solution and latex, three model...
Among “green” alternatives for oil-based commodity plastics like Polyethylene, Polyamides, and Poly(Ethylene Terephthalate) (PET), a new class of polyesters synthesized from furanedicarboxylic acids (FDCAs) is currently in the spotlight of both the academic and industrial communities. Of particular interest is Poly(Ethylene-2,5-Furanoate) (PEF), which can be synthesized from biobased monomers. Owing...
Novel waterborne fluorinated polyurethane (WFPU) based on hydroxyl-terminated poly(fluoroalkyl methacrylates) (HTPFMA) was prepared successfully. The microstructures and micro-phase separation of WFPU were evaluated through infrared spectroscopy (FT-IR), X-ray diffraction (XRD), dynamic mechanical analysis (DMA), and scanning electron microscope (SEM). FT-IR revealed that the H-bonded carbonyl in...
Triple-shape memory polymers (triple-SMPs) have one permanent and two temporary shapes, which enable more complex actuation than traditional dual-SMPs. This work reports a novel polyolefin elastomer (POE)/stearic acid (SA) composite with excellent triple-shape memory and dual-responsive properties. SA displays two well-separated thermal transitions when melt-blending with POE, and is capable of memorizing...
The preparation of diketopyrrolopyrrole-based polymer nanowires seems very difficult, probably due to the fact that the nanowires length direction is along the main chain not the π-π direction. For the nanowires whose length direction is along the main chain, the probability of the short nanowires to meet the ends of other molecules to grow longer is very small. Herein, we prepared long 3,6-bis-(thiophen-2-yl)-N,N’-bis(2-octyl-1-dodecyl)-1,4-dioxo-pyrrolo...
The film quality is the core to produce long-life and efficient organic light emitting devices by ink-jetting printing technology which is deeply related to the ink droplet coalescence process, especially the coalescence bead morphology and thickness. However, the fluid flow from impacted drop to the previously deposited drops (drop to bead flow) usually leads to an asymmetry and heterogeneity of...
Polymer fibers' thermal conductivity along its axis direction are usually much better compared to that of the bulk. Many researches indicate that three main factors have significant impact on polymer fiber's thermal conductivity, which are crystallinity, molecular alignment and crystalline grain orientation of the polymer. Most research focus on polyethylene (PE) because of its relatively high crystallinity...
We sought to identify an evident enthalpic-driven transition below an entropic-driven closed-loop phase transition by studying the phase behavior in miscible binary block copolymer (BCP) blends of a polystyrene-b-poly (n-butyl methacrylate) (PS-b-PnBMA) and a deuterated polystyrene-b-poly (n-hexyl methacrylate) (dPS-b-PnHMA), using small-angle x-ray scattering (SAXS) and depolarized light scattering...
A method for large-scale processing of low density polyethylene (LDPE) nanofibers reinforced by aligned multi-walled carbon nanotubes (MWCNTs) is achieved via nanolayer coextrusion. The morphology and nano-sized diameter of the nanofibers are observed on scanning electron microscope. The prioritized alignment and dispersion of MWCNTs along the fiber axis are determined by transmission electron microscopy,...
Processable poly(cycloacetals) with high molar masses (Mn) up to 38 kDa were synthesized in a systematic manner. Di-trimethylolpropane (Di-TMP) was used as tetravalent alcohol and was combined with a series of available dialdehydes, after a model reactivity study. These polymers have a high thermal stability with degradation temperatures (Td) up to 370 °C while the glass transition temperatures (T...
A feasible co-endcapping strategy has been developed for the synthesis of monofunctional polyhedral oligomeric silsesquioxanes (POSS) modified waterborne polyurethane (WPU). The work starts from the synthesis of di-isocyanate terminated PU prepolymer from isophorone di-isocyanate (IPDI), poly (1,4-butylene adipate) end-capped diol (PBAD), and 2,2-bis(hydroxymethyl) butyric acid (DMBA). The two kinds...
The thermal stability of organic photovoltaics (OPVs) is greatly enhanced by using an interdiffused polymer/fullerene bilayer (ID-BL) as a photoactive layer. The solutions of poly[[9-(1-octylnonyl)-9H-carbazole-2,7-diyl]-2,5-thiophenediyl-2,1,3-benzothiadiazole-4,7-diyl-2,5-thiophenediyl] (PCDTBT) and phenyl-C71-butyric-acid-methyl ester (PCBM) are sequentially deposited to form the ID-BL. For comparison,...
Novel amphiphilic poly(2-oxazoline)s bearing l-prolinamide moieties at the alkyl side-chain termini were designed and synthesized by a bottom-up protocol. These polymers formed micelle-type assemblies with a size of 10–30 nm in water, in which the majority of prolinamide active groups was tucked into the hydrophobic inner core. As a nanoreactor, the micellar systems were successfully applied to the...
A simple and efficient technique was developed to generate continuous polymer nanofibers by combining multilayer co-extrusion with a unique exit cutting die. This is an environment-friendly approach and is capable of converting multilayered films to fibers through a simple physical cutting process. Poly(lactic acid) (PLA) fibers with down to 50 nm width were successfully produced using this new technique...
An amphiphilic diblock-copolymer consisting of poly(3-hexylthiophene) and poly(4-vinylpyridine) has been synthesized and self-assembled from mixed selective solvents of tetrahydrofuran and methanol to produce nanostructures having photoluminescence spanning from the blue to the red. The emission decay times of the nanostructures have been found to increase with the fraction of methanol, suggesting...
Interpenetrating interfaces between a deuterated polystyrene (dPS) and the grafted substrates with the same chemical identity were characterized using neutron reflectivity (NR) measurements, where the PS-grafted substrates were prepared using a grafting-to approach with hydroxyl end-functionalized polystyrene (PSOH) in a dry brush regime. The characteristic brush thickness (h) and grafting density...
Thickness-dependent ordering of lamellar microdomains in symmetric polystyrene-b-poly(methyl methacrylate) (PS-b-PMMA) thin films was studied using scanning force microscopy (SFM), scanning electron microscopy (SEM), and grazing incidence small-angle X-ray scattering (GISAXS). The extent of perpendicular orientation for the lamellar microdomains on a neutral substrate was assessed at various film...
Among “green” alternatives for oil-based commodity plastics like Polyethylene, Polyamides, and Poly(Ethylene Terephthalate), a new class of polyesters synthesized from furandicarboxylic acids (FDCAs) currently is in the spotlight of both the academic and industrial communities. Of particular interest is Poly(Ethylene-2,5-Furanoate) (PEF), which can be synthesized from monomers derived from sugars...
We report a facile synthetic approach to a new type of catechol containing UV dimantlable adhesive. A series of linear polymers containing pendent catechol moieties and main chain o-nitrobenzyl ester groups were synthesized by the Passerini multicomponent polymerization (MCP) of a di-o-nitrobenzaldehyde, 1,6-diisocyanohexane, 3-(3,4-dihydroxyphenyl) propionic acid, and undecanoic acid. The content...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.