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Fluorescence imaging, especially specific organelle imaging, has become a significant technology to comprehending cell transplantation, migration, division, fusion, and lysis. In this paper, we designed and synthesized a water soluble and fluorescent polymer named as Poly(AA-TPA-d), which was pH-responsive by the fluorescence channel due to the presence of poly acrylic acid as the polymer backbone...
A highly robust and flame retardant borate-crosslinked poly (vinyl alcohol)/montmorillonite aerogel is fabricated through a novel melt-crosslink method. In this way, the PVA/MMT hydrogel was prepared by immersing the frozen PVA/MMT sol into a borax solution, inducing crosslinking between diols of PVA and borate exactly during the ice melt. As a result, rearrangement of the polymer chains and subsequent...
The convenient synthesis of core-shell nanoparticles containing degradable components is very desirable given the potential applications of such nanoparticles in biomaterials. A facile approach for producing monodisperse starch-polystyrene nanocomposites with well-defined core-shell structures in the absence of a surfactant was developed. The initially-formed Pickering emulsions underwent conversion...
Several polymers are constructed through a facile one-pot approach connecting glycoluril with different aldehydes using p-toluenesulfonic acid as both catalyst and solvent in a sealed tube at high temperature. Fourier transform infrared and solid-state 13C CP/MAS NMR spectroscopy are used to elucidate the final structure of the glycoluril based porous organic polymers. The materials, with Brunauer–Emmet–Teller...
The design and synthesis of a novel polyether-ester injectable hydrogel with a low gelation concentration and biological compatibility is important in tissue engineering. PTMC-F127-PTMC and PTMAc-F127-PTMAc block copolymers were synthesised via the ring-opening polymerisation of trimethylene carbonate (TMC) or copolymerisation of TMC and 2-methyl,2-methylacrylate,1,3-bimethylene (Ac) using F127 as...
In this study, a novel approach has been developed to introduce orientation to bundle-like β spherulite in iPP samples. The addition of UHMWPE phase, which plays the role of maintaining orientation of iPP chains, into β-nucleation agent nucleated iPP samples leads to the formation of oriented β spherulite in the inner region of injection molded samples. Accordingly, both the tensile strength and impact...
Poly(N-isopropylacrylamide) (PNIPAm)-hectorite clay nanocomposite cryogels (NC-C gels) were prepared by freezing polymerization at −18 °C of NIPAm monomer in the aqueous hectorite clay suspensions. The clay concentration C xLS was found to be a key factor determining the characters of the NC-C gels, because the average interparticle distance became smaller than the clay diameter when C ...
Nano-fibrous scaffolds modified with biological peptides, which can mimic the physical and chemical characteristics of an extracellular matrix (ECM), have been considered good candidate matrices for cell culture in tissue engineering application. In this study, a series of semicrystalline block copolymers, specifically pendent carboxyl-containing poly(ε-caprolactone-co-β-malic acid)-block-poly(l-lactide),...
The effect of poly(ethylene glycol) (PEG) on the nonlinear viscoelasticity of Laponite suspensions containing NaCl was investigated with large amplitude oscillatory shear rheology. The molecular weight (M w ) of PEG was 4k, 10k and 35k, and the concentration of PEG was varied from 0.063 wt% to 2.4 wt%. The dynamic strain sweep showed that the nonlinearity appeared at γ 0 > 30%...
Ionic nanocomposite hydrogels cross-linked by hectorite Laponite XLS with high tensile strength and ultrahigh tensibility were successfully synthesized for the first time via in situ copolymerization of N-isopropylacrylamide (NIPAm) and sodium methacrylate (SMA). The pH and temperature response, transparency, and mechanical properties of the ionic hydrogels were investigated. The results showed that...
A simulation model based on self-consistent mean field theory (SCMFT) has been developed to inspect the approaching process of the polymer chain grafted AFM tip to a substrate. The effects of various controlling parameters, such as grafting position, chain number, chain length, as well as solvent- and substrate-chain interactions, on the force curve were investigated. Real force spectroscopy of AFM...
A series of polymer blends were designed and manufactured. They are composed of three phases: polypropylene (PP), polyamide-6 (PA6) and polyethylene-octene elastomer (POE) grafted with maleic anhydride. The weight fraction of PA6 was adjusted from 0 to 40% by increments of 10%, and the weight fraction of POE was systematically half that of PA6. The morphology, essentially made of PA6 particles dispersed...
A polypropylene/poly(ethylene-co-propylene) (iPP/EPR) in-situ blend synthesized by spherical Ziegler–Natta catalyst was fractionated by temperature-gradient extraction fractionation. The fractions were characterized using FTIR, 13 C NMR, DSC and WAXD. The in-situ blend was found to contain mainly three portions: an ethylene–propylene random copolymer, a series of segmented copolymer with PE...
Spherulites and lamellar single crystals of poly(aryl ether ketone ketone) containing isophthaloyl moieties (PEKK(I)) were obtained from dilute α-chloronaphthalene solution. The morphology and structure of the spherulites and single crystals were studied by electron microscopy and electron diffraction. The spherulites were found to consist of elongated lamellar branches that grow with the b crystallographic...
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