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【期刊论文】Thermo-sensitive switching membranes regulated by pore-covering polymer brushes
杨万泰
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-1年11月30日
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【期刊论文】A facile approach to surface graft vinyl acetate onto polyolefin articles
杨万泰, Lin Tan, , Jianping Deng, and Wantai Yang, *
Polym. Adv. Technol. 2004; 15: 523~527,-0001,():
-1年11月30日
A facile and environment friendly approach was developed to graft vinyl acetate (VAc) onto plastic articles in an aqueous solution using tert-butyl alcohol (TBA) as a compatiblizer and benzoyl peroxide (BPO) as an initiator. In a novel setup, excessive monomer suspended in a water phase, VAc could be conveniently grafted on the model substrate of low-density polyethylene (LDPE) film and the graft percentage (GP) could be developed up to 7.3%. Reaction temperature could increase GP significantly, while adding monomer over a critical volume did not influence GP. By adding some paradioxybenzene, i.e. 0.06-0.08% in VAc phase, homopolymer PVAc could be avoided practically, while graft polymerization proceeded favorably in aqueous solutions. It was proved by attenuated total reflection-infrared (ATR-IR) spectroscopy that grafted VAc was located mainly at the surface of the LDPE film and hydrophilic nature of both grafted and alcoholyzed films were improved via contact angle measurements. Copyright
polyethylene (, PE), , vinyl acetate (, VAc), , graft copolymers, surface modification, radical polymerization
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杨万泰, Chang-Min Xing, , Wan-Tai Yang*
Macromol. Rapid Commun. 2004, 25, 1568~1574,-0001,():
-1年11月30日
A novel, stabilizer-free dispersion polymerization with alkyl esters as reaction media gives uniform alternating microspheres of maleic anhydride (MAn)/vinyl acetate (VAc) copolymer. The diameter of the copolymer microspheres could be precisely controlled from 80 to 750nm by changing the monomer concentration or feed ratio. Moreover, this new type of copolymer microspheres with reactive anhydride groups on the surface has good solubility in common nontoxic solvents such as water and ethanol.
colloids, dispersion polymerization, microspheres, stabilizer-free, templates
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【期刊论文】Auto-Initiating Performance of Styrene on Surface Photografting Polymerization
杨万泰, Jian-Ping Deng, a, Wan-Tai Yang, *, Bengt R
Macromol. Rapid Commun. 2001, 22, 535~538,-0001,():
-1年11月30日
Investigating the surface photografting polymerization of styrene (St), it was found that in the absence of photoinitiator and at high temperatures, a remarkable amount of St-grafted polymer is formed. The initiation performance of St was further confirmed by surface photografting polymerization of acrylic acid, where St was used as the photoinitiator. This finding is useful to investigate the reaction mechanism of aromatic compounds under UV radiation and develop photoinitiatorfree polymerization systems.
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【期刊论文】MMA/DVB Emulsion Surface Graft Polymerization Initiated by UV Light
杨万泰, Yongxin Wang† and Wantai Yang*
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-1年11月30日
Methyl methacrylate/1,2-divinylbenzene (MMA/DVB) in an opaque emulsion were successfully grafted onto the surface of polymeric substrate under the irradiation of UV light with benzophenone (BP) as a photoinitiator that was previously coated on the substrate surface. Monomer conversion, grafting efficiency, and grafting yields were determined by the gravimetric method. ATR-IR, AFM, and TEM were used to characterize the surface composition, to observe the topography of the grafted substrates, and to view inter-film colloid particles formed by cross-linking. The results reveal that, with the opaque MMA/DVB emulsion system and CPP film as substrate, the monomer conversion is in the range of 15-55%, the grafting efficiency is about 80%, the grafting yield reaches 5%, and the thickness of the graft layer can be controlled in the range 0.09-1.5
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