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New primary structure parameters (PSP3 and PSP3*) were developed to help better understand the effects of polymer microstructure on polyethylene stress cracking as determined by post yield tensile tests. Previously, the structure parameter, PSP2, was obtained using only molecular weight distributions (MWD) and short chain branching distributions (SCBD) obtained from size exclusion chromatography coupled...
In the present study, the influence of filler concentration on the dynamic properties of nanocomposites based on the thermoplastic polyimide R-BAPO has been investigated by means of full-atomistic molecular dynamics simulations. The orientational mobility of chain fragments of different lengths has been studied before and after embedding of single-walled carbon nanotubes (SWCNT) into the polymer....
Muti-functional shape memory materials based on epoxy resins (EP) with different concentration of chain-extended bismaleimide resins (CBMI) were fabricated. The resulting EP/CBMI polymers have high glass transition temperature (Tg: 93–125 °C), excellent thermal stability and good mechanical property. Unlike traditional shape memory polymers (SMPs), EP/CBMI SMPs are capable of shape reconfiguration...
We present the innovative synthesis of polyethersulfone/poly(acrylic acid) composite hydrogel membranes performed by combining photoirradiation with a traditional liquid phase inversion process. Fabricated membranes exhibited ion exchange capacity and water content as high as 5.2 mmol/g and 75%, respectively. The chemical composition of the membranes was determined using FTIR-ATR and their microstructure...
We investigated surface structures of three kinds of block copolymer (BCP) specimens forming hard spherical microdomains embedded in a soft matrix, by using atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS) and grazing-incidence small-angle X-ray scattering (GISAXS). The three BCP specimens consist of different chemical species such as SEBS (polystyrene-block-poly(ethylene-co-butylene)-block-polystyrene)...
To enhance the mechanical, thermal, and electrical properties and economic profits, polycarbonates (PCs) have been blended with various inorganic additives for the past few decades. Herein, we fabricated basalt fiber (BF)-infiltrated PC composites as a promising candidate for a myriad of PC applications. Mechanical robustness and rheology were examined via the precise control of BF contents (up to...
We propose a facile method for preparing toughening epoxies using self-assembled scaffolds formed by organogels. 1,3:2,4-dibenzylidene sorbitol (DBS) is a sugar derivative that is capable of self-assembling into a 3-D nanofibrillar network at relatively low concentrations in certain organic solvents to form organogels. In this work, we induced the formation of such nanofibrils in the most frequently...
Advanced polyrotaxane elastomers were fabricated by the synthesis of poly(ε-caprolactone)-grafted polyrotaxanes with significantly lower coverage than previously achieved. The time course for the complexation of α-cyclodextrin with an end-functionalized polyethylene glycol (PEG) was analyzed by subsequent end-capping and polyrotaxane isolation, which revealed that the bulkiness of the PEG end group...
Interest in the development of new materials based on natural polysaccharides has grown exponentially in the last decade. Therefore, polysaccharide hydrogels gain striking attention having unique properties. In this study, karaya gum polysaccharide hydrogels have been synthesized using free radical mechanism. In this mechanism, ammonium persulfate (APS) was used as an initiator to form free radicals...
Self-healing coatings are endowed with the ability of self-repair upon damage, thus enhancing their life-time. However, limited by the complex chemistry and composition design, the reported self-healing coatings have processing difficulties and undesired low mechanical properties. This work presents a self-healing epoxy coating system obtained by simply blending a commercial epoxy with a series of...
Polyhedral Oligomeric Silsesquioxanne (POSS) moieties are tethered on a polyurethane chain, as side groups on the hard domains, which are based on the flexible hexamethylene diisocyanate (HDI). Their effect on morphology, and consequently on molecular dynamics, is studied in detail by microscopy, scattering, spectroscopic, thermal, and dielectric techniques. Albeit the PU micromorphology does not...
Small-angle scattering was employed to characterize the gradual phase mixing and separation of Estane 5703p, a type of polyester polyurethane, as a function of temperature (20–110 °C) and time (minutes to 80 days). The polymer structure was modelled by polydisperse hard spheres, and microstructure evolution of the material was inferred from the development of the fitting parameters. At temperatures...
To face the increasing demands of self-healing hydrogels with biocompatibility and mild condition degradability, one brand new type of P(NIPAM-FPA-DMA) copolymers were prepared in this study. The copolymers were cross-linked by dihydrazide compound to form acylhydrazone containing self-healable hydrogels without additional catalysis. Herein, the chemical structure, as well as microscopic morphologies,...
Exfoliated molybdenum disulfide (E-MoS2) incorporated sulfonated poly ether sulfone (SPES) nanocomposite proton exchange membranes (PEMs) were made by solution casting method. E-MoS2 was synthesized from bulk MoS2 powder by ultrasonication and SPES was prepared by sulfonation of PES using sulfuric and chlorosulfonic acid. Surface characterization of these membranes have been performed using several...
Three amine-functionalized 1,1-diphenylethylene (DPE) derivatives (DPE-(NMe2)2, DPE-NMe2 and DPE-SiH/NMe2) were used to study the end-capping reactions of poly(styryl)lithium (PS-Li) for investigating the effect on end-capping of electron-donating groups in DPE structures. In situ 1H NMR was used to measure the kinetic parameters of end-capping reactions. When the DPE derivative was held constant...
The low-frequency dynamics of magneto-sensitive elastomers (MSEs) with chain-like and plane-like distributions of magnetic particles is studied under a uniform magnetic field. In this study we continue our previous work [Ivaneyko D. et al., Soft Matter, 2015, 11, 7627–7638], in which a coarse-grained cubic network model was proposed for description of the dynamic-mechanical behaviour of isotropic...
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