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Xiujuan Huang,Meidong Lang,Yan Xiao 한국고분자학회 2012 Macromolecular Research Vol.20 No.6
A series of star-shaped poly(ε-caprolactone) (PCL)-based diblock and triblock copolymers containing 2-(dimethylamino)ethyl methacrylate (DMAEMA or DMA) and oligo(ethylene glycol)monomethyl ether methacrylate (OEGMA or OEG) were synthesized by one-pot atom transfer radical polymerization (ATRP) using a sixarm PCL-based macroinitiator. The precursor and the resultant copolymers were analyzed via proton nuclear magnetic resonance spectra (1H NMR) and size exclusion chromatography (SEC). The monomer reactivity ratios for DMAEMA (r1) and OEGMA (r2) were estimated to be near unity and r1×r2=1, which indicates the random distribution of the monomers in the final copolymers. Self-assembly behavior of these copolymers was investigated by fluorimetry,1H NMR, dynamic light scattering (DLS), transmission electronic microscopy (TEM), potentiometric titrations, and zeta potential measurements. The results suggested that the star copolymers were responsive to salinity depending on their composition and structure.
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Xiujuan Huang,Yan Xiao,Meidong Lang 한국고분자학회 2011 Macromolecular Research Vol.19 No.2
A series of amphiphilic six-armed copolymers, containing poly(ε-caprolactone) (PCL) and poly(2-(diethylamino)ethyl methacrylate) (PDEAEMA or PDEA) as the arm and cyclotriphosphazene as the core, were obtained by a combination of ring-opening polymerization (ROP) and atom transfer radical polymerization (ATRP). The star block S(PCL-b-PDEAEMA) copolymers were characterized by ^1H NMR spectroscopy and size exclusive chromatography (SEC). These copolymers could self-assembly into micelles in an aqueous solution at low pH with a low critical aggregation concentration (CAC) in the range of 2 to 10 mg/L, which depend on the composition of the copolymers. The original aggregates could further form larger micelles and/or vesicles by adjusting the external stimulus, which was examined by dynamic light scattering (DLS) and transmission electron microscopy (TEM). The lower critical solution temperature (LCST) of the star copolymers were determined to be 49.7 and 26.3 ℃ at pH 6.5and 7.4, respectively, demonstrating a pH-dependent thermo-response.
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Electronic structures and relevant physical properties of Ni2MnGa alloy films
Kiwon Kim,Jinbae Kim,Jooyull Rhee,Meidong Huang,Nina Lee,이영백,Yurie Kudryavtsev 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.1
The electronic structures and physical properties of the ordered and disordered Ni2MnGa alloy lms were investigated in this study. Ordered and disordered Ni2MnGa alloy lms were prepared by ash evaporation onto substrates maintained at 720 K and 150 K, respectively. The results show that the ordered lms behave in nearly the same way as the bulk Ni2MnGa ferromagnetic shape-memory alloy, including the martensitic transformation at 200 K. It was also revealed that the lm deposition onto substrates cooled by liquid nitrogen leads to the formation of a substantially-disordered or an amorphous phase which is not ferromagnetically ordered at room temperature. An annealing of such an amorphous lm restores its crystallinity and also recovers the ferromagnetic order. It was also claried how the structural disordering in the lms in uences the physical properties, including the loss of ferromagnetism in the disordered lms, by performing electronic-structure calculations and a photoemission study.
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