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To make clear the effect and mechanism of graphene functionalized by amines on the morphology and properties of PI nanocomposites, graphene functionalized by different amines (AFG), including ethylenediamine, diethylenetriamine and p-phenylenediamine (EG, DG and PG, respectively), was prepared and used to synthesize a series of PI composites by in situ polymerization. Different amines with varying...
A series of titanium (Ti) complexes bearing ONO-tridentate Schiff bases were synthesized and their application to the ring-opening polymerization of L-lactide and ε-caprolactone was studied. Ti complexes bearing ONO-tridentate Schiff bases revealed a greater catalytic activity compared to other previously synthesized Ti complexes bearing multi-dentate phenolate ligands. We hypothesize that using ONO-tridentate...
In order to understand the trans-1,4 stereospecific polymerization mechanism of conjugated dienes with the heterogeneous Ziegler-Natta catalyst, isoprene polymerization kinetics at different polymerization temperature in the initial polymerization stage and the microstructures of polymers and its fractions were studied in this work. Both polymerization temperature and time influenced the polymerization...
The nonlinear rheological behaviors of concentrated double-stranded (ds) and single-stranded (ss) DNA solutions were studied under standard oscillatory and large amplitude oscillatory shear (LAOS) deformations. To decompose the total stress into the elastic and viscous components, the raw nonlinear waveforms were analyzed using the MITlaos software package. We found that smooth and rigorous intracycle...
Conducting polymeric polyaniline hollow spheres (PANI-HS) were fabricated and evaluated as a smart electro-stimuli responsive material, whose both special structure of shorter diffusion length promotes the electron transfer and specific surface area is greatly amplified than solid spheres. The monodisperse polystyrene (PS) seeds were initially synthesized by a facile surfactant-free emulsion polymerization,...
Sulfonated poly (vinylidenefluoride-co-hexafluoropropylene) (SPVdF-co-HFP) based polymer nanocomposite proton exchange membranes (PEMs) were successfully fabricated in the presence of sulfonated graphene oxide (SGO) as nano-filler for direct methanol fuel cell (DMFC) applications. Sulfonation of GO was carried out using sulfanilic acid and the incorporation of -SO3H groups were confirmed by FTIR,...
Amylose, a natural polysaccharides, is a well-known functional material, because it forms double helix and inclusion complex assemblies depending on whether guest compounds are present or not, owing to its left-handed helical conformation. Amylose is precisely synthesized by phosphorylase-catalyzed enzymatic polymerization. In this study, we investigated the phosphorylase-catalyzed enzymatic polymerization...
The evolution of crystalline domain orientation vs. mechanical properties of aramid fibers under mechanical loading was investigated for initial crystalline domain orientations between 16.7° and 9.7°. The latter resulted in a broad range of longitudinal moduli between 66 GPa and 119 GPa but tensile strengths in the narrow range of 3.5–4.0 GPa. Mechanical conditioning up to 90% of the fiber tensile...
The main-chain thermotropic liquid crystalline polymer (LCP) has been reported to be able to simultaneously lower friction coefficient and wear rate when introduced into poly (vinylidene fluoride) (PVDF) as the lubricant. In this investigation, we aim to obtain some insight into the lubricating mechanism of LCP. Through atomic force microscopy (AFM) and Raman spectroscopy, friction-induced in-situ...
Realization of structural manipulation in stereocomplex (sc) polylactic acid holds the key to fully leverage its surpassing performance, such as heat resistance and mechanical properties. In this study, we investigated the evolution of crystalline morphology/structure of equimolar racemic blends under the quantitative shear field modulated by the pulling speed of glass fiber (GF). Shear-induced crystallization...
We report the synthesis, characterization and application of a novel biocompatible nanogel (n-Gly/pHEMA) synthesized from glycogen and 2-hydroxyethyl methacrylate using ethylene glycol dimethacrylate crosslinker. Here mesoporous silica has been used as template. The structure of the nanogel has been investigated with the help of FTIR, 1H NMR and 13C NMR spectroscopy. The FESEM, HR-TEM and DLS analyses...
Two polythiophenes with carboxylate side chains and vinylene linkers in conjugated backbones, i.e., poly[5,5′-(E)-bis(2-hexyldecyl)-2,2′-(ethene-1,2-diyl)bis(thiophene-3-carboxylate)-alt-5,5′- 2,2′-bithiophene] (PBT) and poly[5,5′-(E)-bis(2-hexyldecyl)-2,2′-(ethene-1,2-diyl) bis(thiophene-3-carboxylate)-alt-5,5′-thieno[3,2-b]thiophene] (PTT), were synthesized and characterized. Compared to poly(3-hexylthiophene)...
The self-assembled microstructures of the bottlebrush polymers in aqueous solution are investigated by dissipative particle dynamic simulation. A series of structures, such as cylinder, sphere, lamella, perforated lamella, and network, are obtained from the solutions at various concentrations. These structures are arranged into several phase diagrams constructed by the main and side chains in various...
The effects of chain-grafting density, chain composition, and interactions between different species on the self-assembled structures and chain conformations of planar grafted ABA triblock copolymers in a solvent selective for the middle B-block are investigated systematically using 3-dimensional lattice self-consistent field calculations. Structures with one A-rich layer (S1Aa and S1Ab) and with...
Bi- and tri-armed polyethylene glycol units endcapped with nitroaryl urea units have been synthesised. These endcapped polymers are able to self-assemble via complementary supramolecular interactions, specifically urea-urea and nitro-urea hydrogen bonding, to afford materials with dramatically increased mechanical and thermal properties when compared to those of the uncapped polyethylene glycol precursors...
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...
The pristine and acetylated cellulose nanocrystal (CNC) particles were incorporated with poly(ε-caprolactone) to prepare two kinds of green nanocomposite systems: the former is incompatible, while the latter compatible thermodynamically. A rheological study was then performed systematically with various flow fields, including linear and nonlinear dynamic shear flow, creep and start-up flow. Some interesting...
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