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As a fast developing soft lithographic technique, the development of micro-contact printing (μCP) has exceeded the original aim of replicating poly(dimethylsiloxane) (PDMS) stamp patterns. Here we exploited several extended μCP strategies with various printing conditions (over-force or swelling induced physical deformation, and UV-Ozone treated chemical surface modification to a PDMS stamp), combining...
Effect of external electrical field on phase equilibrium was reported for poly(γ-benzyl l-glutamate) (PBLG) in a mixed solvent containing denaturant acid where a helix–coil transition coupled anisotropic–isotropic transition exists. The experimental results revealed that the anisotropic phase and helix conformation can be stabilized when an external electrical field is applied. In the presence of...
Polymeric micelles based on poly(γ-benzyl-l-glutamate)–poly(ethylene glycol) graft copolymer (PBLG-g-PEG) with various degrees of grafting and the mixtures composed of PBLG-g-PEG and poly(γ-benzyl-l-glutamate)–poly(ethylene glycol) block copolymer (PBLG-b-PEG) were prepared by the dialysis method in deionized water. Fluorescence spectroscopy and transmission electron microscope (TEM) have been used...
We utilized melt polycondensation of 2,2-bis(hydroxymethyl) propionic acid (bis-MPA) and 2-ethyl-2-hydroxymethyl-1,3-propanediol (TMP) to synthesize a hyperbranched polyester core and subsequent substitution by reaction of terminal hydroxyl with benzoyl chloride in DMF in the presence of TEA as the acceptors of HCl. It has been found that well-defined macroscopic structures can be formed via hydrogen...
Amphiphilic maleic anhydride–stearyl methacrylate (MA–SMA) random copolymer was synthesized via the free radical copolymerization and its amide was prepared through the MA moieties being reacted with morpholine. Polymers obtained were characterized by GPC and 1 H NMR. The aggregating behaviors of copolymers were investigated by first dissolving them in tetrahydrofuran (THF) and then adding...
In this paper, hyperbranched polyesters (HPs) were synthesized in the molten state from 2,2-bis(hydroxymethyl) propionic acid (bis-MPA) and 2-ethyl-2-hydroxymethyl-1,3-propanediol (TMP) using acid catalysis. The modified hyperbranched polyesters were obtained through the chemical modification of the hyperbranched polyester cores by substituting a controlled fraction of the terminal hydroxyl groups...
One kind of large-size bamboo-shape nanotube from self-assembly of poly(ferrocenyldimethylsilane-b-dimethylsiloxane) (PFS-b-PDMS) block copolymer was obtained. It was found that firstly, PFS-b-PDMS formed sphere micelles and pearl-like cluster at room temperature, and then bamboo-shape nanotube formed when the solution was aged about 3 days. The formation mechanism of bamboo-shape nanotube was also...
A novel approach was applied to prepare shell thickness controllable magnetic microsphere precursor through the self-assembly of PDMS homopolymer with PFS-b-PDMS in selective solvent and adjusting the prepared conditions of samples such as temperature and aging time. The magnetic microsphere precursor provided with adjustable dimension of shell thickness 15, 40 and 90nm, respectively, which made it...
Polyacrylonitrile (PAN)/Na-montmorillonite (Na-MMT)/SiO 2 nanocomposites were prepared via in situ emulsion polymerization. X-ray diffraction (XRD) results suggest that the Na-MMT layers are exfoliated during the polymerization process. As evidenced by the transmission electron microscope (TEM), the Na-MMT and nano SiO 2 particles exhibit good dispersion in the polymer matrix. It was...
The benzoyl-terminated multiarm hyperbranched poly(3-ethyl-3-oxetanethanol) (HBPO-B) was synthesized by reaction of terminal hydroxyl with benzoyl chloride in CH 2 Cl 2 in the presence of pyridine and triethylamine (TEA) as the acceptors of HCl. The macroscopic self-assembly structures of hyperbranched benzoyl-terminated poly(3-ethyl-3-oxetanethanol) can be obtained via a simple solvent...
Here, the dendritic chloric poly(benzyl ether) (G 1 -Cl, G 2 -Cl and G 3 -Cl) as the macroinitiator for the controlled atom transfer radical polymerization (ATRP) of methyl methylacrylate was investigated. Polymers obtained were characterizated by GPC, 1 H NMR, FT-IR, TGA and DSC. These dendritic-linear block polymers that consist of linear and dendritic segments have...
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