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Author: search.filters.author.Huang, Chih-FengSubject: search.filters.subject.block copolymers

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    Syntheses and specific interactions of poly(epsilon-caprolactone)-block-poly(vinyl phenol) copolymers obtained via a combination of ring-opening and atom-transfer radical polymerizations
    (2006-11-01)
    Kuo, Shiao-Wei
    ;
    Huang, Chih-Feng
    ;
    Lu, Chu-Hua
    ;
    Lin, Ho-May
    ;
    Jeong, Kwang-Un
    A series of PCL-b-PVPh diblock copolymers were prepared through combinations of ring-opening and atom-transfer radical polymerizations of c-caprolactone and 4-acetoxystyrene, and subsequent selective hydrolysis of the acetyl protective group. This PCL-b-PVPh diblock copolymer shows a single glass transition temperature over the entire composition range, indicating that this copolymer is able to form a miscible amorphous phase due to the formation of intermolecular hydrogen bonding between the hydroxyl of PVPh and the carbonyl of PCL. In addition, DSC analyses also indicated that the PCL-b-PVPh diblock copolymers have higher glass transition temperatures than their corresponding PCL/PVPh blends. FT-IR was used to study the hydrogen-bonding interaction between the PVPh hydroxyl group and the PCL carbonyl group at various compositions.
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    Formation of honeycomb structures and superhydrophobic surfaces by casting a block copolymer from selective solvent mixtures
    (2007-02-02)
    Tung, Pao-Hsiang
    ;
    Kuo, Shiao-Wei
    ;
    Jeong, Kwang-Un
    ;
    Cheng, Stephen Z. D.
    ;
    Huang, Chih-Feng
    Poly(vinyl phE!nol)-block-polystyrene (PVPh-b-PS) diblock copolymers are synthesized by sequential anionic polymerization with sec-butyl lithium as the initiator. The Pvph-b-PS diblock copolymer is cast (on a substrate) from several solvent mixtures that contain tetrahydrofuran/toluene ratios of 1:0.1, 1:1, and 1:2. After solvent evaporation the resulting films are characterized by SEM, TEM, and contact angle measurements. A honeycomb structure is fabricated from the vesicle structure at relatively low toluene contents. On the contrary, at relatively higIier toluene contents, a micelle structure with porous microspheres is formed, which possesses higher surface roughness and results in film surface superhydrophobicity. The simple method described here that uses common/selective mixed solvents may be easily extended to prepare honeycomb structures and superhydrophobic surfaces simultaneously from a wide variety of block copolymers by carefully controlling the weight composition of the block copolymer and the selective solvent con-tent.
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    Synthesis of Photoisomerizable Block Copolymers by Atom Transfer Radical Polymerization
    (2009-09-22)
    Huang, Chih-Feng
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    Chen, Wei
    ;
    Russell, Thomas P.
    ;
    Balazs, Anna C.
    ;
    Chang, Feng-Chih
    A series of polystyrene-block-poly(n-butyl methacrylate) (PS-b-PnBMA) diblock copolymers (di-BCPs) with an azobenzene moiety [trans-4-methacryloyloxyazobenzene (MOAB)] in the PnBMA segment was prepared by atom transfer radical polymerization (ATRP). P(nBMA-co-MOAB) macroinitiators were prepared by activators regenerated by electron transfer (ARGET) ATRP. The MOAB was slightly more reactive than nBMA, resulting in a weak gradient fashion of copolymer. The macroinitiators were subsequently chain-extended with styrene. Acceleration of the ATRP rate was observed in the presence of a reducing agent. P(nBMA-co-MOAB)-b-PS di-BCPs were obtained with relatively narrow molecular weight distributions ((M) over bar (w)(M) over bar (n) = 1.16-1.49) and the molecular weights were in good agreement with the theoretical values. The efficiency of photoisomerization of the MOAB units was above 80%. DSC traces showed a single T(g) suggesting the block copolymers were miscible before UV irradiation. After UV irradiation, the X-ray reflectivity measurements showed the beating of two frequencies, indicating the formation of island-hole structure.