杨万泰
可控聚合(可控/活性自由基聚合、光聚合、聚合物分子的光控制树状增长、阴离子活性聚合)和高分子材料表面改性(可控/活性自由基聚合、聚合物刷、纳米功能表面、开发光接枝法连续表面改性工业新技术)
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- 姓名:杨万泰
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- 担任导师情况:
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学术头衔:
博士生导师, 国家杰出青年科学基金获得者, 教育部“新世纪优秀人才支持计划”入选者,
- 职称:-
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学科领域:
材料科学
- 研究兴趣:可控聚合(可控/活性自由基聚合、光聚合、聚合物分子的光控制树状增长、阴离子活性聚合)和高分子材料表面改性(可控/活性自由基聚合、聚合物刷、纳米功能表面、开发光接枝法连续表面改性工业新技术)
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16
【期刊论文】Thermo-sensitive switching membranes regulated by pore-covering polymer brushes
杨万泰
,-0001,():
-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*
,-0001,():
-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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杨万泰, Peng Yanga, b, Jian Yuan Denga, Wan Tai Yanga, *
Polymer 44 (2003) 7157~7164,-0001,():
-1年11月30日
When a very thin persulfate salt aqueous solution layer (mm) was sandwiched between two polymer films and strong UV light irradiated the assembly from the side transparent to UV light, a fast surface hydrophilic modification method for most of commercial polymeric materials was developed. For example, irradiating for 90s and using 30wt% ammonium persulfate, the static surface water contact angles of polymeric substrates decreased from 100 to 448 for LDPE, from 107 to 348 for HDPE, and from 73 to 158 for PET. The increases in surface hydrophilicity came from the formation of a sulfate salt group (SO4 2NH4
Surface oxidation, Persulfates, Surface modification
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【期刊论文】Bulk Surface Photografting Process and Its Applications. I. Reactions and Kinetics
杨万泰, WANTAI YANG* and BENGT RANBY†
,-0001,():
-1年11月30日
A bulk surface photografting process which is conducted in the interface between two polymer films was designed and investigated. The bulk surface photografting is a highly efficient process. With this method, the surface of hydrophobic polymers can be made hydrophilic in less than 2 s and a grafted layer 5 Im thick can be obtained in 30 s. The kinetic investigation shows that the bulk surface photografting polymerization involves a four-step reaction process: induction period, surface initiation, successive polymerization, and solid-phase crosslinking. The photoreduction of benzophenone (BP) takes place in the interlayer between the LDPE films and is a three-stage process: surface photoreduction, secondary photoreduction, and solid-state photoreduction. With regard to the photoreduction of the initiator caused by hydrogen abstraction, the kinetic studies show that the photoreduction rate has a first-order dependence on the BP concentration. The activation energy of the hydrogen abstraction reaction is about 28.5 kJ (6.8 kcal)/mol. With regard to the photografting polymerization reaction, the reaction order of the rate Rp with respect to the monomer is unity and 0.89 with respect to BP. This means that the termination reaction takes place mainly by combination of polymer chain free radicals and semipinacol free radicals from BP. The activation energy of the overall polymerization reaction is around 8.8 kJ (2.1 kcal)/mol.
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杨万泰, YUHONG MA, , WANTAI YANG
,-0001,():
-1年11月30日
The nonaqueous dispersion polymerization of styrene in methanol with poly[(4-methylstyrene)-co-(4-vinyltriethylbenzyl ammonium bromide)]-b-polyisobutene as a stabilizer was investigated. There was no observable inducing period or autoacceleration in the polymerization process. The conversion increased almost linearly with the polymerization time as high as 80%. The average sizes of the obtained polystyrene particles increased, and the size distributions of the polystyrene particles tended to become narrower, with increasing conversion. The mechanism of the dispersion polymerization in the presence of polyisobutene-b-poly[(4-methylstyrene)-co-(4-vinyltriethylbenzyl ammonium bromide)] was nucleation/growth. When the stabilizer/monomer ratio (w/w) was greater than 2.0%, the polystyrene dispersion was stable, and there was no observable polymer particle coagulation taking place during the whole polymerization process. The average diameter of the polymer particles can be mediated through changes in the polymerization conversion, monomer, and stabilizer. Nearly monodispersed polystyrene particles with average diameters of approximately 0.45–2.21 m were obtained under optimal conditions.
ionomers, block copolymers, dispersion polymerization, radical polymerization, polystyrene, polymer particles
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杨万泰, LIANYING LIU, WANTAI YANG
,-0001,():
-1年11月30日
The kinetics of photoinitiated, inverse emulsion polymerization of acrylamide with 2,2-dimethoxy-2-phenylacetophenone (DMPA) as a photoinitiator was investigated under three different cases. First, in a quartz reactor transparent to full UV light, the polymerization rate (Rp) increased and then decreased with the change of initiator order from 0.27 to a negative value when the DMPA concentration was increased, and it was particularly unusual that monomer orders at different DMPA concentrations were lower than the first. Second, for polymerization without DMPA in a quartz reactor, the dependence of Rp on monomer concentration was similar to that of Rp on initiator concentration in the aforementioned case. Third, when polymerization was carried out in a Pyrex reactor where the far UV light was filtered, a peak rate was also observed, and initiator orders varied from 0.24 to a negative value; however, under this case monomer orders at different initiator concentrations were greater than the first. These results indicated that the effect of absorbance often observed in bulk or solution photopolymerization also existed in this system, and the self-initiation of monomer had some influence on polymerization, and the role of primary radical termination could not be neglected, as evidenced by kinetic analysis.
photopolymerization, kinetics (, polym., ), , inverse emulsion, acrylamide, water-soluble polymers
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杨万泰, YUHONG MA, , GUANYING WU, WANTAI YANG
,-0001,():
-1年11月30日
isobutene, cationic polymerization, block copolymers, 4-methylstyrene, copolymerization
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