王玉忠
环境友好高分子材料的研究,特别是在高效无卤阻燃高分子材料、生物降解塑料、废弃高分子材料的回收利用等领域
个性化签名
- 姓名:王玉忠
- 目前身份:
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学术头衔:
“973”、“863”首席科学家, 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:
高分子化学
- 研究兴趣:环境友好高分子材料的研究,特别是在高效无卤阻燃高分子材料、生物降解塑料、废弃高分子材料的回收利用等领域
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10
【期刊论文】Modifications of ZSM-5 zeolites and their applications in catalytic degradation of LDPE
王玉忠, Qian Zhou, Yu-Zhong Wang*, Chao Tang, Yu-Hua Zhang
Polymer Degradation and Stability 80(2003)23-30,-0001,():
-1年11月30日
The combination of two modification techniques developed for the ZSM-5 zeolite, i.e., desilication and incorporation of lanthanum under microwave irradiation, has produced a highly efficient catalyst, DeLaZSM-5, for catalytic degradation of low-density polyethylene (LDPE). Its performance on the degradation was studied at 390C and compared with the parent ZSM-5 and the modified intermediate products desilicated ZSM-5 (DeZSM-5) and LaZSM-5. Among the catalysts tested, DeLaZSM-5 showed the highest catalytic degradation rate. In addition, on DeLaZSM-5 the liquid yield was slightly increased and the isoparaffin index of the liquid was almost doubled, which indicated higher liquid quality compared with the parent ZSM-5 zeolite. The high catalytic activity of DeLaZSM-5 could be explained by its unique acidic properties with a sharp increase of the number and strength of weak acid sites and a decrease of strong acidsites.
DeLaZSM-5 zeolite, Catalytic degradation, LDPE
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王玉忠, XIU-LI WANG, KE-KE YANG, YU-ZHONG WANG, ZHI-XUAN ZHOU, YONG-DONG JIN
Journal of Polymer Science: Part A: Polymer Chemistry, Vol. 42, 3417-3422 (2004),-0001,():
-1年11月30日
A new biodegradable starch graft copolymer, starch-g-poly(1,4-dioxan-2- one), was synthesized through the ring-opening graft polymerization of 1,4-dioxan-2-one onto a starch backbone. The grafting reactions were conducted with various 1,4-dioxan-2-one/starch feed ratios to obtain starch-g-poly (1,4-dioxan-2-one) copolymers with various poly(1,4-dioxan-2-one) graft structures. The microstructure of starch-gpoly (1,4-dioxan-2-one) was characterized in detail with one- and two-dimensional NMR spectroscopy. The effect of the feed composition on the resulting microstructure of starch-g-poly(1,4-dioxan-2-one) was investigated.
biodegradable, characterization, graft copolymers, NMR, poly (, 1,, 4-dioxan-2-one), , starch
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王玉忠, Yu-Zhong Wang, * Xiao-Ting Chen, Xu-Dong Tang and Xiao-Hua Du
J. Mater. Chem., 2003, 13, 1248-1249,-0001,():
-1年11月30日
A kind of synthesized thermotropic liquid crystal copolyester containing phosphorus (PLCP) with high flame retardancy (oxygen index, 70%) has been used to prepare in situ reinforced PET composites that have both good flame retardancy and better mechanical properties than pure PET. The melt dripping behavior of PET was also improved.
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【期刊论文】Crystallization and morphology of starch-g-poly (1,4-dioxan-2-one) copolymers
王玉忠, Xiu-Li Wang, Ke-Ke Yang, Yu-Zhong Wang*, Dan-Qi Chen, Si-Chong Chen
Polymer 45(2004)7961-7968,-0001,():
-1年11月30日
The thermal transition, crystallization and spherulitic morphology of starch-g-poly (1,4-dioxan-2-one) copolymers were studied by means of differential scanning calorimetry (DSC) and polarized optical micrographs (PM). It is found that the graft structures of copolymers have obvious effects on the thermal and crystallization behaviors. Because there were more defect sites in the crystalline phase originating from the short grafted chains of poly (1,4-dioxan-2-one)(PPDO), the crystal structure of the copolymers was much less perfect than that of PPDO. PM revealed that the spherulitic morphology of the graft copolymers depended on graft structures and crystallization temperatures. From the single polarized micrograph of the graft copolymers it was observed clearly that the starch segments acted as nucleation sites. The Avrami equation was used to analyze the overall isothermal crystallization of the graft copolymers. Avrami exponents were almost constant at crystallization temperatures Tc ranging from 45 to 60 8C. Both the PM observation and the DSC investigation (crystallization rate constant, K values) indicated that the graft copolymers crystallize faster than pure PPDO, especially at higher crystallization temperatures.
Starch-g-poly (, 1,, 4-dioxan-2-one), , Thermal transition, Crystallization
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王玉忠, YU-ZHONG WANG
Journal of Polymer Science: Part B: Polymer Physics, Vol. 41, 2296-2301 (2003),-0001,():
-1年11月30日
The solubility behaviors of poly(sulfonyldiphenylene phenylphosphonate) (PSPPP), a very efficient flame retardant for poly(ethylene terephthalate) (PET), in more than 50 solvents were examined. Its solubility parameters (δ) were determined by the intrinsic viscosity and turbidic titration methods. The two methods obtained consistent results, δ=21.0-21.6J1/2/cm and δ=21.0J1/2/cm3/2, and the three-dimensional solubility parameters were δ=18.9J1/2/cm3/2, δ=8.8J1/2/cm3/2, and δh=5.9J1/2/cm3/2. The miscibility of PSPPP with PET was estimated by the calculation of the heats of mixing, which were related to the difference between the solubility parameters of PSPPP and PET. Fourier transform infrared was used to examine the interactions between PSPPP and PET macromolecules, which were the internal factors of polymer-polymer miscibility. The results showed that PSPPP and PET were miscible within a very wide composition range, especially with less than 15wt% PSPPP, a composition of interest for the preparation of flame-retardant PET.
poly (, sulfonyldiphenylene phenylphosphonate), , solubility parameter, miscibility, poly(, ethylene terephthalate), , flame retardance, intrinsic viscosity
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王玉忠, Xiu-Li Wang, Ke-Ke Yang, Yu-Zhong Wang *, De-Yi Wang, Zheng Yang
Acta Materialia 52(2004)4899-4905,-0001,():
-1年11月30日
Poly (1,4-dioxan-2-one)(PPDO)/starch blend is a novel biodegradable polymer system, and it has potential applications in preparing various low-cost environmentally friendly materials. In order to understand the relationship between their structure and properties, the thermal transition, crystallization and spherulitic morphology of PPDO/starch blends have been studied by means of differential scanning calorimetry (DSC) and polarized optical microscopy. It was found that when 5wt% starch was added to PPDO, a clear nucleating effect was observed. When the blends were crystallized from the melt, they formed banded spherulites that exhibited a well-defined Maltese cross depending on the crystallization temperature. Avrami exponents and crystallization rate constants of the blends with 5wt% starch were higher than those of PPDO and those of the blends with 10wt% starch. Both the dynamic DSC results and isothermal crystallization data indicated that the starch, with a content of 5wt% in the blends, acted as the nucleating agent for PPDO.
Poly (, 1,, 4-dioxan-2-one), , Starch, Blend, Thermal transition, Crystallization
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王玉忠, Yu-Zhong Wang, Bing Yi, Bo Wu, Bing Yang, Ya Liu
Journal of Applied Polymer Science, Vol. 89, 882-889 (2003),-0001,():
-1年11月30日
Potassium diphenyl sulfonate (SSK), poly-(sulfonyl phenylene phosphonate) (PSPPP), and their mixtures are proved to be effective flame-retardants for polycarbonates (PCs) by measuring the limited oxygen index values and UL-94 of blends. The flame-retardant systems are characterized by thermogravimetric analysis under dynamic conditions. The resulting data, together with the analysis of the activation energies, demonstrates that the additives ac-celerate thermodegradation, especially in the early stage, and different additives cause a different process in the final stage.
flame-retardant, polycarbonate, thermogravimetric analysis
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王玉忠, Li-Min Deng, Yu-Zhong Wang *, Ke-Ke Yang, Xiu-Li Wang, Qian Zhou, Song-Dong Ding
Acta Materialia 52(2004)5871-5878,-0001,():
-1年11月30日
To obtain a biodegradable polymer material with satisfactory thermal properties, higher elongation and modulus of elasticity, a new copolyester, poly(butylene succinate-co-ethylene succinate-co-ethylene terephthalate) (PBEST), was synthesized via direct polycondensation from three prepolymers of butylenes succinate, ethylene succinate and ethylene terephthalate (ET). The resulting copolyesters, PBEST, were characterized by 1H-NMR, DSC, TG and WAXRD, and their melting temperature (Tm), melting heat of fusion (DHm), glass-transition temperature (Tg), and thermal decomposition temperature (Td) (1.5wt%) were obtained. Compared to poly(butylene succinate-co-ethylene succinate) (PBES), PBEST has improved thermal properties such as higher Tm and Td due to the incorporation of poly (ethylene terephthalate) unit into the main chains of copolyesters, but very low crystallization speeds. The degradation test of copolyesters in a compost condition shows that the degradability of PBEST is as a function of content of ET.
Butylene succinate, Ethylene succinate, Ethylene terephthalate, Copolyester, Synthesis, Characterization, Biodegradability
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王玉忠, FU-YUN HUANG, YU-ZHONG WANG, XIU-LI WANG, KE-KE YANG, QIAN ZHOU, SONG-DONG DING
Journal of Polymer Science: Part A: Polymer Chemistry, Vol. 43, 2298-2303 (2005),-0001,():
-1年11月30日
Poly (p-dioxanone)(PPDO)/montmorillonite nanocomposites were prepared through the in situ ring-opening polymerization of p-dioxanone (PDO) and three types of montmorillonites (natural sodium montmorillonite, montmorillonite modified by octadecyltrimethyl ammonium chloride, and montmorillonite modified by hydroxyethylhexadecyldimethyl ammonium bromine) in the presence of triethylaluminum. Montmorillonite could accelerate the polymerization of PDO, and the viscosity-average molecular weight of PPDO could reach 44,900g/mol in 0.5h. A nucleating effect of montmorillonite was observed, and the crystallization temperature of PPDO was increased by 18 8C. All three montmorillonites could improve the thermal stability of PPDO and increase the glass-transition and melting temperatures of PPDO.
biodegradable, montmorillonite, nanocomposites, poly (, p-dioxanone), , synthesis
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