张宝砚
主要从事液晶高分子的研究。所从事的液晶离聚物、液晶杂化材料、生物大分子、光功能高分子材料等方面的研究
个性化签名
- 姓名:张宝砚
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学术头衔:
博士生导师
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学科领域:
高分子化学
- 研究兴趣:主要从事液晶高分子的研究。所从事的液晶离聚物、液晶杂化材料、生物大分子、光功能高分子材料等方面的研究
张宝砚,教授,博士生导师,东北大学分子科学与工程中心主任,国家质量监督检验检疫总局防伪技术专家,功能高分子学报编委,辽宁省防伪协会副理事长。从事过聚苯硫醚、聚芳酯、聚砜、环氧树脂、特种涂料的小试与中试及投产。1990-1991年作为访问学者,在美国康狄涅格大学材料研究所工作,主要从事液晶高分子的研究。所从事的液晶离聚物、液晶杂化材料、生物大分子、光功能高分子材料等方面的研究居功能高分子材料研究领域的前沿。作为课题负责人,先后承担“863”、 “973”、国家科技部攻关课题各1项,国家自然科学基金委课题3项,省部级项目22项,沈阳市科技局科技攻关课题6项,橡塑新型材料合成国家工程中心攻关课题1项,横向课题19项。成果获辽宁省自然科学一等奖1项,辽宁省科技进步二等奖1项。发明专利6项。在国内外重要期刊上发表论文100余篇, 其中被SCI检索56篇,被EI检索46篇,被ISTP检索12篇。目前指导在读博士生25名,硕士生15名,博士后2名。
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10
张宝砚, Fanbao Meng, Baoyan Zhang*, Lumei Liu, Baoling Zang
Polymer 44(2003)3935-3943,-0001,():
-1年11月30日
A series of siloxane-based liquid-crystalline (LC) elastomers were synthesized by using chemical crosslinking agents containing sulfonic acid groups. The crosslink densities of the elastomers were determined by swelling experiments. Two kinds of melting temperature corresponding to crystallization of siloxane matrix and crystallization of LC segments were clearly detected. Some of the polymers exhibited smectic mesophase textures or cholesteric mesophase textures. A proposed model containing LC segment structure and ionic crosslinking lamellar structure separated by siloxane chains was given. The ion aggregated in domains forces the siloxane chains to fold and form an irregular lamellar structure. Ionic aggregates and LC segments may be dispersed each other to form multiple blocks with increasing ionic crosslinking content.
Liquid-crystalline elastomers, Ionic crosslinking agents, Sulfonic acid
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张宝砚, Jian-She Hu, Bao-Yan Zhang, *, Ying-Gang Jia, and Song Chen
Macromolecules 2003, 36, 9060-9066,-0001,():
-1年11月30日
The synthesis of the two monomers M1 and M2 and a series of new side-chain cholesteric liquid crystalline elastomers P2-P8 is presented. The chemical structures of the monomers and elastomers obtained were confirmed by FTIR or 1H NMR spectroscopy. The cross-link density of the elastomers was determined by swelling experiments. The mesomorphic properties were investigated by differential scanning calorimetry (DSC), thermogravimetric analyses (TGA), polarizing optical microscopy (POM), and X-ray diffraction (XRD) measurements. Monomer M1 showed a cholesteric phase, and M2 revealed smectic and nematic phases. The effect of the cross-link density on the phase behavior of P2-P8 is discussed. Elastomers P2-P6 containing less than 12mol % of the cross-linking units displayed elasticity, reversible liquid crystalline phase transition, wide mesophase temperature ranges, and high thermal stability. Elastomer P7 displayed stress-induced birefringence, and P8 showed only elasticity with no other texture. Experimental results demonstrated that the glass transition temperatures increased, and the isotropization temperatures and the mesophase temperature ranges of P2-P6 decreased with increasing cross-link density.
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【期刊论文】Liquid-Crystalline Elastomers Containing Sulfonic Acid Groups
张宝砚, Bao-an Zhang, *, Fan-Bao Meng, Bao-Ling Zang, and Jian-she Hu
Macromolecules 2003, 36, 3320-3326,-0001,():
-1年11月30日
A series of ionic liquid-crystalline (LC) elastomers were synthesized by using chemical crosslinking agents containing sulfonic acid groups, which were siloxane-based materials. A ionic divinyl monomer 2,2¢-(1,2-ethenediyl)bis[5-[(4-undecenoyloxy)phenyl]azo]benzenesulfonic acid was used as chemical cross-linking agent. Cholest-5-en-3-ol(3β)-10-undecenoate was synthesized as a liquid-crystalline monomer. The effective cross-link density of the ionic elastomers was determined by swelling experiments in organic/buffer mixtures. Their liquid-crystalline properties were characterized by DSC, POM, and SAXS. A proposed multilayer buildup containing LC segment structure and ionic cross-linking lamellar structure separated by siloxane chains was given. The ion aggregated in domains forces the siloxane chains to fold and form an irregular lamellar structure. The ionic cluster lamellae may be tangled with the rigid mesogenic groups of LC segments to form multiple blocks. Liquid-crystal mesophase region of the polymers become narrow with increasing ionic cross-linking content.
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张宝砚, Department of Chemistry, Northeastern University, Shenyang , People's Republic of China; Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun , People's Republic of China
Journal of Applied Polymer Science, Vol. 85, 1110-1117 (2002),-0001,():
-1年11月30日
The miscibility and mechanical properties of the blends of polybutylene terephthalate (PBT) and polypropylene (PP) with a liquid crystalline ionomer (LCI) containing a sulfonate group on the terminal unit as a compatibilizer were assessed. SEMand optical microscopy (POM) were used to examine the morphology of blends of PBT/PP compatibilized by LCI. DSC and TGA were used to discuss the thermal properties of PBT/PP blends with LCI and without LCI. The experimental results revealed that the LCI component affect, to a great extent, the miscibility and crystallization process and mechanical property of PBT/PP blends. The fact is that increasing LCI did improve miscibility of PBT/PP blends and the addition of 1%LCI to the PBT/PP blends increased the ultimate tensile strength and the ultimate elongation.
miscibility, morphology, polypropylene, blends, liquid crystalline polymer
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【期刊论文】Synthesis and Characterization of Network Liquid Crystal Elastomers and Thermosets
张宝砚, YINGGANG JIA, BAOYAN ZHANG, ENLE ZHOU, ZHILIU FENG, BAOLING ZANG
Journal of Applied Polymer Science, Vol. 85, 1104-1109 (2002),-0001,():
-1年11月30日
A new series of network liquid crystal polymers were synthesized by graft copolymerization of the difunctional mesogenic monomer 4-allyloxy-benzoyloxy-4'-allyloxybiphenyl (M) upon polymethylhydrosiloxane (PMHS). MonomerMacted not only as a mesogenic unit but also as a crosslinker for the network polymers. The chemical structures of the polymers were confirmed by IR spectroscopy. DSC, TGA, and X-ray scattering were used to measure their thermal properties and mesogenic properties. The glass transition temperature (Tg) of these network liquid crystal polymers was increased when the monomer was increased, and Td (temperature of 5%weight loss) at first went up and reached a maximumat P1, then went down. The slightly crosslinked polymers (P0, P1) show rubber-like elasticity, so it was called liquid-crystal elastomer. Network polymers will lose elasticity property with a highly crosslinked degree, and turn into thermosetting polymers (P4, P5). All polymers exhibited a smectic texture by X-ray scattering.
liquid crystal, elastomers, networks, thermosets,
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张宝砚, YUANMING LI, , BAO YAN ZHANG, ZHILIU FENG, AILING ZHANG
Journal of Applied Polymer Science, Vol. 83, 2749-2754 (2002),-0001,():
-1年11月30日
A novel side-chain, liquid-crystalline ionomer (SLCI) with a poly(methyl hydrosiloxane) main chain and side chains containing sulfonic acid groups was used in blends of polyamide-1010 (PA1010) and polypropylene (PP) as a compatibilizer. The morphological structure, thermal behavior, and liquid-crystalline properties of the blends were investigated by Fourier transform infrared, differential scanning calorimetry, thermogravimetric analysis, and scanning electron microscopy. The morphological structure of the interface of the blends containing SLCI was improved with respect to the blend without SLCI. The compatibilization effect of greater than 8wt % SLCI for the two phases, PA1010 and PP, was better than the effects of other SLCI contents in the blends.
liquid-crystalline ionomers, polyamides, poly (, propylene), (, PP), , blend compatibilization
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张宝砚, JIANSHE HU, , BAOYAN ZHANG, ZHILIU FENG, HONGGUANG WANG, AIJUAN ZHOU
Journal of Applied Polymer Science, Vol. 80, 2335-2340 (2001),-0001,():
-1年11月30日
The synthesis of new chiral smectic A (SA) side-chain liquid crystalline polysiloxanes (LCPs) and ionomers (LCIs) containing 4-allyloxy-benzoyl-4-(S-2-ethylhexanoyl) p-benzenediol bisate (ABB) as mesogenic units and 4-[[4-(2-propenyloxy)phenyl]azo]benzenesulfonic acid (AABS) as nonmesogenic units is presented. The chemical structures of the monomers and polymers are confirmed by FTIR spectroscopy or 1H-NMR. Differential scanning calorimetry (DSC), optical polarizing microscopy, and X-ray diffraction measurements reveal that all the polymers PI-PIV and ionomers PV-PVI exhibit SA texture. The results seem to demonstrate that the tendency toward the SA-phase region increases with increasing sulfonic acid concentration, and the thermal stability of the SA phase is determined by the flexibility of the polymer backbones and the interactions of sulfonic acid groups.
chiral, smectic, polysiloxane, liquid cystalline ionomer, sulfonic acid, 4-allyloxybenzoyl-4-(, S-2-ethylhexanoyl), p-benzenediol bisate
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张宝砚, BAOYAN ZHANG, SANMING GUO, BING SHAO
Journal of Applied Polymer Science, Vol. 68, 1555-1561 (1998),-0001,():
-1年11月30日
A novel thermotropic side-chain liquid crystalline ionomer (LCI) containing sulfonic acid groups on the side-chain was synthesized by graft copolymerization of mesogenic monomer 4-allyloxy-benzoxy-4*-methoxyphenyl (ABM) and nonemesogenic monomer 4-allyloxy-azobenzene sulfonic acid (AABS) upon polymethylhydrosiloxane (PMHS). The chemical structures of the polymers were confirmed by IR spectroscopy. DSC and TGA were used to measure the thermal properties of those polymers and the mesogenic properties were characterized by polarized optical micrography (POM), DSC, and WAXD. The clearing point temperature (Tc) of these liquid crystalline ionomers was enhanced 50-607C compared with the polymer without ionic groups. The LCIs exhibit a broad smectic mesogenic region of 80-907C; the thermal stability below 2007C of the polymers decreases with increasing sulfonic acid concentration. The inherent viscosity of 0.5% solutions decreased with increasing sulfonic acid concentration in the polymer chains.
liquid crystalline ionomers, 4-alloylphenylazobeneze sulfonic acid, polymethylhydrosiloxane, smectic, nematic
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张宝砚, BAOYAN ZHANG*, and R. A. WEISS†
Journal of Polymer Sciencer. Part A: Polymer Chemistry, vol. 30, 989-996 (1992),-0001,():
-1年11月30日
Liquid crystalline ionomers containing sulfonate groups on the terminal unit of the chain were synthesized by an interfacial condensation reaction of 4,4'-dihydroxy-a,a'-dimethyl benzalazine, the monofunctional dye fast yellow (FY), and a 50/50 mixture of sebacoyl and dodecanedioyl dichlorides. The weight-average molecular weights were estimated from inherent viscosity measurements to be between 6000-11,000 and the sodium sulfonate concentrations ranged from 0-18.4meq/100g polymer. Elemental analyses, however, indicated much higher molecular weights, which suggested that there was a distribution of chains with one, two, or no FY endgroups. The polymers were semicrystalline and melted at ca. 140℃ to form nematic mesophases that were stable over a temperature range of ca. 80℃. They were thermally stable to about 350℃. The ionomeric nature of the polymers was confirmed by the presence of intermolecular associations in nonpolar solvents, as demonstrated by dilute solution viscosity measurements.
main chain liquid crystalline polymers • nematic • mesophase • sulfonate • ionomer • synthesis • characterization
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张宝砚, BAOYAN ZHANG*, and R. A. WEISSt
Journal of Polymer Sciencer. Part A: Polymer Chemistry, Vol. 30, 91-97 (1992),-0001,():
-1年11月30日
Liquid crystalline polymers containing sodium sulfonate groups pendant to the polymer backbone were synthesized by an interfacial condensation reaction of brilliant yellow, a sulfonate-containing monomer, with 4,4'-dihydroxy-a,a'-dimethyl benzalazine and a 50/50 mixture of sebacoyl and dodecanedioyl dichlorides. Polymers containing up to ca. 4mol% brilliant yellow were characterized by elemental analysis and ultraviolet spectroscopy. The polymers were thermally stable to about 300℃, and they exhibited a broad nematic mesophase region of 70-100℃. The solution viscosity behavior in chloroform suggested that intramolecular associations of the sulfonate groups occurred at low polymer concentrations and internolecular associations predominated at higher concentrations.
main-chain liquid crystalline polymers • nematic • mesophase • sulfonate • ionomer • synthesis • characterization
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