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Different from classic water activated polyelectrolytes, poly(ionic liquid)s (PILs) bearing hydrophobic counterions show high electrorheological (ER) response in dry state. This offers opportunity for practical applications of polyelectrolyte-based ER materials in wide temperature region. For guiding the design of PIL-based ER materials with improved performance, understanding the structure-property...
A PDMS elastomer based on acylhydrazone groups with both acid- and heat-assisted self-healing properties was successfully prepared from tetra-acylhydrazine-terminated PDMS and terephthalaldehyde through solution casting. The good healing performance was obtained with catalytic acetic acid for 24 h at 25 °C or by annealing at 120 °C for 2 h. The elastomer exhibited a reversible transition near 80 °C...
In this paper, the reversible crystal-crystal transition of poly(hexamethylene dithiocarbonate) (PHMDC) has been systematically studied. According to various experimental results, we confirm that the transition shares the common features with Brill transition that is widely observed in nylons. This transition is clearly associated with the reversible trans-gauche conformational transformation of the...
The thermal imidization process of 1,2,4,5-benzenetetracaboxylic (PMDA)/4,4’-diamnodiphenyl ether (4,4′-ODA) solutions in N-methyl-2-pyrrolidone (NMP) from polyimide (PI) precursor, poly (amic acid) (PAA), was systematically investigated through a series of characterization methods, such as Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), differential scanning calorimetry...
Polyethersulfone (PES) electrospun nanofibrous membranes have been prepared and deposited on both sides of a microporous polyethylene (PE) substrate to fabricate a nanocomposite separator, which exhibits a high meltdown temperature (MDT) to prevent the thermal runaway within the battery under the condition of overcharging or abuse. To improve adhesion to electrospun PES nanofibrous membranes, the...
Multicellular spheroids (MCSs) are in vitro tissue models having important biomedical applications. The MCS generation is usually time-consuming because most MCS fabrication methods exploit the inherent ability of cells to self-assemble to form spheroids. Here we tried to accelerate the MCS generation by chemical pre-aggregation of the cells. We first developed a method to chemically aggregate cells,...
Hydrogenation has been proved to be an efficient way to remove the toxicity of phthalate plasticizer. However, other influences of this hydrogenation are still unknown. Here we chose di-2-ethylhexyl phthalate (DOP) and di(2-ethylhexyl) cyclohexane-1,2-dicarboxylate (DEHHP) to study the influence on interaction with poly(vinyl chloride) (PVC). By combining experiment and calculation, we found the interaction...
Sequential thiol-ene click reaction is reported for amphiphilic glycosylated polyphosphazene. Poly[bis(allylamino)phosphazene] was used as precursor to go through UV irradiation with 2,3,4,6-tetra-O-acetyl-1-thiol-β-D-glucopyranose (SH-GlcAc 4 ) and 1-dodecanethiol in sequence. Variation of the reaction conditions, including click reaction time and the dose of photoinitiator, led to different...
A supramolecular polymer gel formed between triptycene-based bis(crown ether) and copolymer containing dibenzylammonium (DBA) moieties by host–guest interactions was described. We demonstrated the formation of the supramolecular polymer networks between the bis(crown ether) and the copolymer by the 1 H NMR spectroscopy and solution viscometry, and we also obtained a colorless and transparent...
Effects of surface functionalization of carbon nanotubes (CNTs) on their nucleation ability for poly(l-lactide acid) during isothermal and nonisothermal crystallization were investigated. The results showed that the surface functional groups reduced the nucleation ability of CNTs. The polarity of the functional CNTs was notably changed due to the presence of covalent groups (i.e., –OH, –COOH, and...
A novel class of high-flux microfiltration filters consisting of an electrospun nanofibrous membrane and a conventional non-woven microfibrous support is being presented. The nanofibrous non-woven layer was fabricated by electrospinning of polyvinylalcohol (PVA) directly onto the microfibrous support and then followed by chemical cross-linking with glutaraldehyde (GA) in acetone. By altering the processing...
Rheological properties of cellulose dissolved in two ionic liquids (ILs), 1-allyl-3-methylimidazolium chloride (AmimCl) and 1-butyl-3-methylimidazolium chloride (BmimCl), with co-solvent dimethylsulfoxide (DMSO), are studied in the concentration range of cellulose from 0.070 to 6.0 wt%. The viscosities of ILs are exponentially decreased by adding DMSO in the concentration range of 0–100 wt%. The co-solvent...
The actuation strain and speed of ionic electroactive polymer (EAP) actuators are mainly determined by the charge transport through the actuators and excess ion storage near the electrodes. We employ a recently developed theory on ion transport and storage to investigate the charge dynamics of short side chain Aquivion ® (Hyflon ® ) membranes with different uptakes of ionic liquid...
Poly(lactic acid) (PLA) can crystallize in α-, β-, γ- and stereocomplex (sc)- forms. It has been shown that the formation of stereocomplex between poly(l-lactic acid) and poly(d-lactic acid) significantly improve thermal stability and mechanical properties. However the mechanisms of enhancements are still unclear. In this study, we investigate the PLA polymorphs from the first-principles theoretical...
The poly(ethylene oxide)–urea binary system forms a stable (α) complex that can be melt-quenched into a mixture of urea and a second (β) complex with a different stoichiometry. Our results confirm that this mixture is metastable, but that the β–α solid–solid transition is much slower than previously reported. In contrast with the melt-quenched mixture, we observe for the first time that the pure β...
Chaperones are defined as a family of protein that mediates the correct assembly of other polypeptides but that are not components of the functional assembled structures. In this work, we have devised a novel method in which α-cyclodextrins (α-CDs), “artificial chaperones”, facilitate block copolymers self-assembling into the expected structure. Poly(ethylene oxide)-b-poly(4-vinylpyridine) (PEO ...
Using hydrophobic acrylic acid-2-ethylhexyl ester (AAEHE) as a comonomer of methacrylic acid (MAA), a series of hydrophobically modified (HM) poly(methacrylic acid) (PMAA) (HMPMAA) hydrogels were prepared by UV solution copolymerization and studied as controlled-release matrices. The result indicates that swelling degree of the HMPMAA hydrogels can sensitively respond to change in pH. However, the...
A series of high hectorite content nanocomposite Poly (N-isopropylacrylamide), (PNIPAAm), hydrogels have been successfully synthesized by choosing a special kind of hectorite (Laponite XLS) modified by tetrasodium pyrophosphate. It was found that these hydrogels show surprising mechanical properties (i.e. tensile strength: 1MPa, elongation at break: 1400%) and complicated deswelling behavior, which...
Composite electrolyte comprising methylsisesquioxane (MSQ) filler and 1-butyl-3-methyl-imidazolium-tetrafluoroborate (BMImBF 4 ) ionic liquid (IL) in poly(2-hydroxyethyl methacrylate) (PHEMA) matrix had been prepared. The polymer matrix was formed by free radical polymerization of HEMA macromer, and MSQ was produced in situ from methyl-trimethoxysilane by the sol–gel method. Infrared spectroscopy...
A reactive β-Cyclodextrin (β-CD) based monomer carrying vinyl carboxylic acid functional groups was synthesized via reaction of β-CD with maleic anhydride (MAH) in N,N-dimethylformamide (DMF) at 80°C. By copolymerization of the monomer with N-isopropylacrylamide (NIPA), a novel hydrogel, poly(NIPA-co-MAH-β-CD) with pH and temperature sensitivities plus molecular inclusion function, was obtained using...
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