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Traditional hydrophobic association (HA) hydrogels can obtain excellent mechanical properties in the presence of anionic surfactants. However, such surfactants are sensitive to salt solutions, resulting in large fluctuation of mechanical properties for hydrogels. Here, a combined surfactant consisting of anionic surfactants (sodium dodecyl sulfate, SDS) and amphoteric surfactants (dodecyl dimethyl...
Due to the good balance between the low vanadium permeability and high proton conductivity, AIEM (amphoteric ion exchange membrane) has attracted vast consideration for all vanadium redox flow battery (VRB) application. Similar to the AIEM, BPMs (bipolar membranes) also have both anion and cation exchange groups in the anion-selective layer and cation-selective layer. In this paper, a series of BPMs...
A novel phthalide-containing aromatic amine (PBMI-DDE) was synthesized by Michael addition of 3,3-bis[4-(4-maleimidophenoxy)phenyl]phthalide (PBMI) and 4,4′-diaminodiphenylether (DDE), its chemical structure was confirmed by nuclear magnetic resonance (NMR) spectrometer and Fourier transform infrared (FTIR) spectrometer. A serial of phthalide-containing epoxy resins were prepared with the PBMI-DDE/DDE...
A novel three-dimensionally (3D) ordered hierarchically porous polypyrrole (3DOHPPy) is successfully synthesized via a simple chemical polymerization method by using silica colloidal crystals as templates. The 3DOHPPy possesses a large BET specific surface area (118.5 m2 g−1), 3D ordered interconnected macropores (240 nm) and mesopores (2–3 nm) on the macropore walls. The sulfur/3DOHPPy (S/3DOHPPy)...
Self-assembly induced increase of magnetic susceptibility for the tadpole-shaped block copolymer based on paramagnetic FeCl4 pyridinium was reported in this work. The tadpole-shaped block copolymer was prepared by sequential reversible addition-fragmentation chain transfer polymerization of styrene (St) and 4-vinylpyridine (4VP) at the presence of chain transfer agent-modified polyhedral oligomeric...
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...
Poly(N-acryloyl glycinamide) (PNAGA) with a protein-like thermoresponsive gelation behavior in water has been developed as a high strength self-healable supramolecular polymer(SP) hydrogels recently. However, harsh conditions, such as high temperature treatment and long waiting time, were required for achieving the complete healing due to strong dual amide hydrogen bonding interactions. In this study,...
The miscibility, crystalline structure and morphology, as well as, properties of Polyamide 6 (PA6)/polyvinylidene fluoride (PVDF) blends (with up to 50 wt% of PVDF) were studied. Small Angle X-ray Scattering study above the melting point of PVDF shows that the blends have very limited miscibility with approximately 5 wt% of PVDF inclusion in PA6 amorphous lamellar region. SAXS results also indicate...
Evaluation of principal residual stress with X-Ray diffraction for metals has been widely practiced, but not for polymers due to a large fraction of amorphous phase, though it is very important for many engineering applications. Such a method is established for rigid semicrystalline polymer with rubber amorphous which, in the present work, are defined as the polymers with an amorphous rubber phase...
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...
In our previous work, poly(butyl acrylate) (PBA) latex microspheres (LMs) were embedded within hydrogels to enhance their mechanical strength. Herein, acrylonitrile (AN) components were added to the latex system to prepare novel poly(butyl acrylate-acrylonitrile) (P(BA-AN)) LMs. LMs were able to adsorb hydrophobic hexadecyl methacrylate (HMA) due to hydrophobic interactions, stabilized by using sodium...
In this work, an abnormal melting behavior of isotactic polypropylene (iPP) was investigated by polarized optical microscopy (POM), temperature-modulated differential scanning calorimetry (TMDSC), scanning electron microscopy (SEM), wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS). It can be found by POM that the melting of α-iPP spherulites isothermally crystallized at...
Sulfonated polymers have shown great promise as a material for membranes in water purification. Their hydrophilic nature combined with impressive chemical stability has yielded unique membranes with desalination capacity combined with chlorine tolerance. In this work, we explore the use of these polymers in support materials for thin film composite (TFC) membranes for forward osmosis (FO). Our reasoning...
In the work, the effect of PFO molecular weight change on the single chains, aggregation and β phase in the solution was investigated. Some regularity of the chain size and shape with the molecular weight change in the dynamics process were revealed and related mechanism was explored. It was found that the β phase content of high molecular weight was higher than that of low molecular weight in the...
It has become increasingly common to use atomic force microscopy measurements to probe mechanical properties at the nano-micro level. The data obtained from these measurements, however, must be subjected to specific models for deconvolution of the effect of the probe's tip size and shape. While analytical models have been developed to assist in this endeavor, a thorough understanding of the limits...
In this article, multiwalled carbon nanotubes (MWCNTs) with polymer shells based on cross-linked divinylbenzene (DVB) were controllably synthesized via direct in situ free-radical polymerization, thereby producing a hybrid composed of a core-shell microstructure and MWCNT center. The coated MWCNT hybrids (DVB@MWCNTs) were ultimately compounded with polystyrene (PS) to prepare nanodielectric composites...
Collagen mimetic polypeptides (CMPs) pendanted with linear or dendritic oligoethylene glycols (OEG) via ether linkage were synthesized, and their thermoresponsiveness, secondary structures and supramolecular assembly investigated. High molar masses of OEGylated CMPs were achieved by polyamidation of tripeptide precursors through activated ester strategy. Pendanted linear OEGs confer CMP with enhanced...
Benzenesulfonic group containing polyamide-6 (PA6) were fabricated through melting polymerized using ε-caprolactam and different proportions of 5-sulphosalicylic acid (5SA). The physicochemical properties of SO3H containing PA6s (SPA6) were determined through FT-IR spectroscopy, TGA and DSC. The morphology of electrospinning fibers of SPA6s were investigated by FE-SEM. Fiber diameters increased with...
One amphiphilic diblock copolymer poly(NIPAm-b-M6AzCOONa) with well-defined structure was synthesized by RAFT polymerization, in which N-isopropylacrylamide (NIPAM) was introduced as one thermoresponsive unit, and 6-[4-(4-sodium carboxylatephenylazo)phenoxyl]hexyl methacrylate (M6AzCOONa) was designed as pH-, UV-responsive and fluorescent units. The block copolymer was non-fluorescent in good solvent,...
We report morphology, thermal analysis and beam diffraction of polyethylene chlorine-substituted precisely on every 21st backbone carbon, after solution crystallization induced by low-dimensional carbonaceous nanofillers (carbon nanotube and graphene). Kebab-like and rod-like nanofiller-induced crystals were separately observed on the surfaces of carbon nanotube and graphene. Fast-scan differential...
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