卜海山
高分子凝聚态和高分子材料:包括高分子结晶、结构与形态,成核和成核剂,高分子分子运动与玻璃化转变,液晶高分子,高性能材料和复合材料
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- 姓名:卜海山
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学术头衔:
博士生导师
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学科领域:
材料科学基础学科
- 研究兴趣:高分子凝聚态和高分子材料:包括高分子结晶、结构与形态,成核和成核剂,高分子分子运动与玻璃化转变,液晶高分子,高性能材料和复合材料
卜海山,男,1959年毕业于复旦大学化学系,现为复旦大学材料科学系教授、博士生导师,曾任材料科学系副系主任,于2002年退休。长期从事高分子科学的教学与科学研究工作,主要研究方向是高分子凝聚态和高分子材料:包括高分子结晶、结构与形态,成核和成核剂,高分子分子运动与玻璃化转变,液晶高分子,高性能材料和复合材料。现正从事液晶高分子材料产业化工作。参加过国家攀登计划项目“高分子凝聚态若干基本物理问题研究”(1993-1997年),负责“单链、寡链、多链凝聚态”课题研究。1998-2001年该项目继续进行,被聘为该项目专家委员会成员和“高分子结晶和液晶”课题负责人。参加国家自然科学基金重大研究计划“理论物理学及其交叉科学若干前沿问题”(2002-2004年)、主持“聚合物链折叠与结晶理论”课题研究。参加过“八五”国家重点科技攻关课题、主持过四个国家自然科学基金项目、二个教育部博士点基金项目。发表论文102篇、专利2篇、申请专利3篇。出版合著1册、合译著1册。1999年,与中国科学院化学研究所等单位共同获得国家自然科学奖二等奖、获奖项目“高分子凝聚态若干基本物理问题研究”。
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【期刊论文】RAPID COMMUNICATION Crystallization of Poly(ethylene 2,6-naphthalate) Containing Additives
卜海山, XIA GAO, MANNA JIN, HAISHAN BU
Journal of Polymer Science: Part B: Polymer Physics, Vol. 38, 3285-3288 (2000),-0001,():
-1年11月30日
additives, poly(, ethylene 2,, 6-naphthalate), , crystallization,, nucleating agents, nucleating promoters
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卜海山, HAISHAN BU, *, FAMING GU, MIN CHEN, LIRONG BAO, and JIE CAO
J. MACROMOL. SCI.-PHYS., B39 (1), 93-108 (2000),-0001,():
-1年11月30日
Samples of nanopolymeric particles, each containing a single chain or a few chains, were prepared by a freeze-drying method from dilute solutions of isotactic polystyrene (iPS) in benzene. Thermal analysis of the particle samples revealed that the cold crystallization temperature greatly decreases and the crystallization rate remarkably increases as the solution concentration decreases. The increase in crystallization rate can be attributed to fewer interchain entanglements within and between particles, thus proving experimentally for the first time that entanglements can be a large barrier to the crystallization of polymers. Annealing of the particle samples at 373.2K slightly changed the crystallization behavior, indicating that the interdiffusion of chains between these particles is rather sluggish in the vicinity of Tg of bulk iPS. Crystallization is assumed to be accomplished before the chain interdiffusion, and nanocrystals form in situ within compact single- and few-chain globules. The average size of crystals is larger than that of single-chain crystals because the single-chain crystals may initiate other chains to crystallize on the growing crystal surface. Meanwhile, we also found that the nanocrystals have a lower melting temperature than the bulk polymer as a result of their small size.
Crystallization,, Entanglement,, Few-chain particles,, Melting,, Single-chain particles.,
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卜海山, MIN CHEN, ZHONGYONG FAN, and HAISHAN BU*
J. MACROMOL. SCI.-PHYS., B39 3), 387-395 (2000),-0001,():
-1年11月30日
Samples of nanoparticles containing single and/or multiple chains were prepared by precipitation from dilute solutions of syndiotactic polystyrene (s-PS). Vibrational spectra of the nanoparticles were determined at room temperature and were compared with bulk s-PS. Significant changes in line shape and line width were observed in the spectra of the nanoparticles. Infrared (IR) analysis of the nanoparticles also indicated a faster crystallization rate and higher crystallinity than for the bulk sample.
Crystallization,, Entanglement,, FTIR,, Nanoparticle,, Syndiotactic polystyrene.,
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卜海山, Fangming Gu*a, Haishan Bu
Macromol. Rapid Commun. 20, 595-597 (1999),-0001,():
-1年11月30日
Collective single- and few-chain compact globules of isotactic polystyrene (i-PS) were prepared from very dilute solution via the freeze-drying technique. A small exothermic peak was found in the differential scanning calorimetry (DSC) traces of freeze-dried samples. This is a manifestation of the existence of 'cohesional entanglements'.
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【期刊论文】Thermal Transition of a Wholly Aromatic Thermotropic Liquid Crystalline Copolyester
卜海山, SHUGUANG BI, , YI ZHANG, HAISHAN BU, ROBERT R. LUISE, JENNY Z. BU
Journal of Polymer Science: Part A: Polymer Chemistry, Vol. 37, 3763-3769 (1999),-0001,():
-1年11月30日
A copolyester was prepared from p-hydroxybenzoic acid (HBA), 2,6-naphthalene dicaboxylic acid (NDA), and hydroquinone (HQ). Thermal transition behavior and the crystal structure of this copolyester were investigated by using polarized light microscopy (PLM), differential scanning calorimetry (DSC), and wide-angle X-ray diffraction (WAXD) after annealing at solid-phase polymerization conditions. A glass transition or newly ordered structure in the 270-290℃ range was observed on annealing at 260℃, which increased with annealing time, attributed to mobility and reactive rearrangement in amorphous regions. Broad and unclear WAXD profiles and multimelting behaviors were found on annealing at 280℃, and explained by hexagonal and orthorhombic lattice formation and transformation. A large increase in melting temperature was observed only on annealing at a temperature (320℃) near the crystal-nematic transition, suggesting annealing temperatures near the melting point are required for sufficient mobility to afford crystalline rearrangement via transesterification.
liquid crystalline polymer, crystallization, melting, glass transition
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卜海山, YONGJIAN LIU, , YI JIN, LINSEN DAI, HAISHAN BU, ROBERT R. LUISE*
Journal of Polymer Science: Part A: Polymer Chemistry, Vol. 37, 369-377 (1999),-0001,():
-1年11月30日
A series of copolyesters were prepared by the incorporation of p-hydroxybenzoic acid (HBA), hydroquinone (HQ), and terephthalic acid (TA) into poly (ethylene terephthalate) (PET). On the basis of viscosity measurements, high molar mass copolyesters were obtained in the syntheses, and 1H-NMR analyses indicated the total insertion of comonomers. They exhibit nematic phase above melting temperature, as observed by polarized light microscope (PLM). Their crystallization and melting behaviors were also studied by differential scanning calorimetry (DSC) and wide angle X-ray diffraction (WAXD). It was found that these copolyesters are more crystalline than copolyesters prepared from PET and HBA. Introduction of HQ/TA disrupts longer rigid-rod sequences formed by HBA, and thus enhances molecular motion and increases crystallization rate and crystallinity. Isothermal crystallization at solid phase polymerization conditions (up to 24h at 200℃) resulted in increased copolymer randomness (by NMR) and higher melting point, the latter attributed to structural annealing.
poly (, ethylene terephthalate), , liquid crystalline polymer, crystallization, melting
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【期刊论文】Conformation analysis of freeze-dried isotactic polystyrene from dilute solutions
卜海山, Fangming Gu, Lirong Bao, Min Chen, Haishan Bu*
Macromol. Rapid Commun. 19, 367-369 (1998),-0001,():
-1年11月30日
Fourier transform infrared spectra of freeze-dried samples of isotactic polystyrene (i-PS) from dilute solutions were analyzed. The 698, 1452, 1493 and 1601cm-1 bands increased in sharpness and intensity as the solution concentration decreased, indicating that the freeze-dried sample is in a more dilated state. When the freeze-dried i-PS was annealed at 1008C, all aforementioned bands broadened and their heights depressed, accompanied with a significant change of the bands at 981 and 906cm-1
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【期刊论文】Communications to the Editor Influence of Entanglements on Crystallization of Macromolecules
卜海山, Haishan Bu, * Fangming Gu, Lirong Bao, and Min Chen
Macromolecules 1998, 31, 7108-7110,-0001,():
-1年11月30日
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【期刊论文】Unique morphologies found in freeze-dried poly(ethylene oxide) prepared from dilute solutions
卜海山, Fangming Gu, Haishan Bu*, Ze Zhang
Macromol. Chem. Phys. 199, 2597-2600 (1998),-0001,():
-1年11月30日
Freeze-dried particles of poly(ethylene oxide) (PEO) were prepared from sublimation of a 1610-2 wt.-% solution of PEO in benzene in an ice-salt bath. After isothermal crystallization at 318.2 l 0.1 K for 2h, an unusual planar zigzag form of PEO was found. A variety of unique spherulite-like morphologies were also observed, and their formation is discussed on the basis of the interaction between solvent molecules and segment of the polymer chains.
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卜海山, HAISHAN BU, , JIE CAO, ZHENSHENG ZHANG, ZE ZHANG, REINHARD FESTAG, DAVID C. JOY, YONG KU KWON, BERNHARD WUNDERLICH
Journal of Polymer Science: Part B: Polymer Physics, Vol. 36, 105-112 (1998),-0001,():
-1年11月30日
The structure of single-molecule single crystals of isotactic polystyrene (i-PS) was investigated by electron diffraction (ED). The nanoscale single-molecule single crystals were found to be more resistant to electron irradiation when compared to the larger crystals of many molecules, as indicated by both observation of ED and high-resolution electron microscopy with increasing radiation dose. It is proposed that since the single-molecule single crystals are very small, the secondary electrons escape more frequently from the crystal so that the radiation damage is reduced. Lattice imaging was achieved at room temperature in the case of single-molecule single crystals because of their stability to electron irradiation.
polystyrene, single-molecule single crystal, radiation resistance, lattice image
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