余鼎声
有机-无机纳米复合材料
个性化签名
- 姓名:余鼎声
- 目前身份:
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学术头衔:
博士生导师
- 职称:-
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学科领域:
材料科学基础学科
- 研究兴趣:有机-无机纳米复合材料
余鼎声,1964年毕业于北京化工学院有机系化纤工业。1981年北京化工大学高分子材料工程硕士毕业后留校工作,从事二烯烃定向聚合研究,因"丁丙交替共聚橡胶开发项目"获中国化学会首届高分子基础研究王葆仁奖;1986-1988年在美国Case大学作访问学者,从事离子聚合与高分子材料的表面改性研究;1992-1995年被聘为国家863计划新材料领域专家组成员;1994年开始有机-无机纳米复合材料的研究,承担过863项目、国家自然基金、化工部及中石化的多项重点项目。曾获得国家教委科技二等奖,中国化学会首届王葆仁基础研究奖等多项奖励。是2005年度国家科学技术奖评奖评审专家,和国家科委何梁何利奖提名人;现任中国材料研究会理事,全国纳米技术标准化委员会委员,中国化学会高分子学科委员;石油化工、高分子通报等期刊编委;在国内外发表论文150余篇,授权专利5项,合著4部,译著2部。
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717
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成果数
17
余鼎声, Qiao
Q. Chen et al. Polymer 47 (2006) 7711-7719,-0001,():
-1年11月30日
A novel nanocomposite composed of polybenzoxazine (PBZ) and multiwalled carbon nanotubes (MWNT) was prepared successfully. The surface modification of MWNT, including nitric acid modification followed by toluene-2,4-diisocyanate (TDI) treatment, introduced hydroxyl, carboxyl, and isocyanate groups on the MWNT surface. The surface carboxyl groups catalyzed the ring-opening reaction of benzoxazine and thus decreased the curing temperature of the system. The isocyanate groups reacted with the phenolic hydroxyl groups generated by the ring opening of benzoxazine resulting in the significant improvement of the adhesion between PBZ and MWNT. Dynamic mechanical analyses indicated the increase of storage modulus as well as Tg by the addition of MWNT into PBZ. A well dispersed modified-MWNT on nanoscale level inside PBZ matrix was observed by TEM and SEM.
Polybenzoxazine,
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余鼎声, Hongying
Journal of Applied Polymer Science, Vol. 102, 3848-3856 (2006),-0001,():
-1年11月30日
The
POSS,
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余鼎声, HONG-WEI
Designed Monomers and Polymers, Vol. 9, No. 4, pp. 369-382 (2006),-0001,():
-1年11月30日
Phenolphthalein (3,3-bis(4-hydroxyphenyl)-1(3H)-isobenzofuranone, B-hpi), reacted with paraformaldehyde and allylamine by the Mannich reaction, was investigated as the acid ingredient for the first time, and a novel benzoxazine was synthesized. In order to confirm the structure of benzoxazine, benzyl-terminated B-hpi (3,3-bis(4-benzyloxyphenyl)-1(3H)-isobenzofuranone, B-bpi) was prepared. The chemical structures of B-hpi, B-bpi and benzoxazine were compared by FT-IR, 1H-NMR and 13C-NMR; it was demonstrated that the lactone structure remains in the molecular structure of benzoxazine (3,3-bis(3-allyl-3,4-dihydro-2H-1,3-benzoxazine)-1(3H)-isobenzofuranone, B-adi). B-adi transformed into a quinoid structure in basic medium similar to that of B-hpi. Software of Accelrys' materials studio (DMol3), FT-IR and UV-Vis spectrophotometry were employed to investigate the properties of the quinoid structure of B-adi and B-hpi. In situ FT-IR spectra showed the thermal curing behavior of B-adi. The char yield of poly B-adi was about 40% by weight at 800◦C in nitrogen atmosphere, as determined by TGA. Tg values for this poly B-adi were as high as 273◦C and 295◦C from the maximum of loss modulus and tan δ by DMTA, respectively.
Phenolphthalein,
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余鼎声, Qiao
Journal of Applied Polymer Science, Vol. 100, 4741-4747 (2006),-0001,():
-1年11月30日
The thermosetting resin from 2,2'-(1,3-phenylene) bis(4,5-dihydro-oxazoles) (PBO) and bis(3-pheny-l3,4-dihydro-2H-1,3-benzoxazine)isopropane (BZ) was prepared, and it was found that the thermal property of the final resin was affected greatly by the content of PBO. The nanocomposite from the thermosetting resin from BZ and PBO (molar ratio of PBO to BZ, 0.8 : 1) (PBZ–PBO) and organically modified montmorillonite (OMMT) was prepared by melt method. Differential scanning calorimetry showed that on the introduction of OMMT, the onset curing temperature of the copolymerization of BZ and PBO decreased. The X-ray diffractometer and transmission electron micrograph characterization of the dispersion of OMMT in the PBZ–PBO matrix suggested that exfoliation structure of OMMT was achieved. Dynamic mechanical analyses indicated that the nanocomposites exhibited much higher Tg values than the PBZ–PBO resin and pristine polybenzoxazine, and storage modulus of the nanocomposites was maintained up to higher temperature with the increasing OMMT content. Dynamic thermogravimetric analysis showed that the dispersion of clay nanolayers in the PBZ–PBO copolymer gave better thermal stability.
benzoxazine,
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余鼎声, Qiao
WILEY-VCH Verlag GmbH& Co. KGaA, Weinheim Macromol. Rapid Commun. 2005, 26, 1878-1882,-0001,():
-1年11月30日
bisoxazoline,
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余鼎声, Hongde
Journal of Applied Polymer Science, Vol. 98, 146-152 (2005),-0001,():
-1年11月30日
Two
nanocomposites,
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余鼎声, JIAN
Journal of Macromolecular Science, Part B: Physics, 44: 303-315, 2005,-0001,():
-1年11月30日
The viscoelastic behavior of ethylene-propylene random copolymer with ultra-high molecular weight (UHPPR) and broad molecular weight distribution (MWD), produced with Ziegler-Natta catalyst, was investigated by means of oscillatory rheometry at 180℃, 200℃, and 220℃. The loss modulus (G") curves of 180℃ and 200℃ present a pronounced peak at 38.10 rad/s and 84.70 rad/s, respectively, while the peak of G00 curve at 220℃ locates beyond 100 rad/s. Compared with UHPPR, G"(v) curves at 180℃ and 200℃ for Ziegler-Natta catalyzed ethylenepropylene random copolymer (PPR) with conventional molecular weight and broad MWD, did not show a peak at 0.01–100 rad/s, respectively. This fact indicates that high molecular weight is responsible for a peak of G00 curves for UHPPR. On the other hand, the activation energy of crossover relaxation time tc (△Ha,c) andterminal relaxation time tm (△Ha,m) is 57.4 kJ/mol and 57.7 kJ/mol, respectively,and shows the same dependence of temperature, which also gives another evidenceof the presence of a peak in the G"(v) curves at 180℃ and 200℃. For UHPPR, the plateau modulus (G0N ) which was determined to be 4.51×105 Pa and 3.67×105 Pa at 180℃ and 200℃, respectively, decreases with increasing temperature and is independent of molecular weight and MWD. The entanglement points of each molecular chain for UHPPR are much higher than those for PPR with conventional molecular weight, which is a partial reason why the melt viscosity increases with increase of molecular weight.
ethylene-propylene
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余鼎声, DING
CHEM. RES. CHINESE U. 2005, 21(2), 227-231,-0001,():
-1年11月30日
The viscoelastic behavior of isotactic polypropylene with ultra-high molecular weight (UHPPH) and broad molecular weight distribution (MWD), produced in the presence of Ziegler-Natta catalyst, was investigated by means of oscillatory rheometry at 180 and 200℃, whose loss modulus (G") plots at 180 and 200℃ versus the natural logarithm of angular frequency (w) present a pronounced maximum at 34.35 and 69.21 rad/s, respectively, and do not show a maximum peak at 0.01-100rad/s for Ziegler-Natta catalyzing ethylenepropylene random copolymerization (PPR) with a conventional molecular weight and broad MWD. The fact indicates that the high molecular weight is responsible for a maximum peak of G" (w) us. Lnw curves for UHPPH. This makes it possible to determine the plateau modulus (G0N) of UHPPH from a certain experimental temperature G"(w) curve directly. For UHPPH, the G0N determined to be 4.28×105 and 3.62×105 Pa at 180 and 200℃, respectively, decreases with the increase of temperature and is independent of the molecular weight, which directly confirms reputation theoretical prediction that the G0N has no relation to the molecular weight.
Isotactic
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余鼎声, Dingsheng
D. Yu et al. Polymer 43 (2002) 3163-3168,-0001,():
-1年11月30日
Benzoxazine
Benzoxazine,
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