李光宪
高分子材料加工基础,多组分高分子相行为,高分子新材料。
个性化签名
- 姓名:李光宪
- 目前身份:
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学术头衔:
博士生导师, 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:
材料合成与加工工艺
- 研究兴趣:高分子材料加工基础,多组分高分子相行为,高分子新材料。
李光宪教授,男,1955年11月出生,中共党员,博士生导师,享受政府特殊津贴。
李光宪1984年在原成都科技大学高材系硕士毕业留校,1989年在复旦大学博士毕业,1990-1993年在英国Heriot-Watt大学从事博士后研究,1993年5月回国任四川大学教授,1996年任博士生导师;曾任塑料工程系主任,研究所所长;现任四川大学科技处处长,教育部科技委委员。曾获全国"宝钢教育基金优秀教师奖",1996年入选教育部"跨世纪优秀人才培养计划",1998年入选国家人事部"百千万人才工程第一、二层次人选",1999年入选教育部优秀骨干教师,2001年入选四川省政府第三批优秀学术带头人。
李光宪教授长期在高分子材料与工程领域从事科研和教学工作,主要研究方向为高分子材料加工基础,多组分高分子相行为,高分子新材料。取得的一些主要学术成果:1)完成了第一个无规共聚物三元共混物相容性理论预测和实验证明;提出"链内排斥"和"链间吸引"两种效应相结合的新方法;获得了一些用传统方法难以得到的新相容共混物;2)开展了基于现代状态方程理论的流动引起的高分子相行为变化和形态控制学科前沿方向研究工作;建立了剪切场中二元聚合物共混体系相分离spinodal方程,并利用流变-光学仪器对PS/PVME、PS/SAN、SAN/PVME、PS/PVME/SAN等多种体系进行了验证实验,取得了十分满意的结果;3)以扩展不可逆热力学(EIT)、"二流体模型"以及"双蠕动"模型为主建立了描述高聚物共混物在剪切场中相行为的理论模型,成功地应用于PS/PVME体系。4)开展了有关高分子结晶前大尺度有序化波动行为的研究,首次将研究范围细分为三个温区,提出了"大尺度有序化波动"与"成核-生长"机理关系假设。5)开展了多项聚烯烃材料改性的研究工作。
李光宪教授已发表论文80余篇,SCI收录40余篇、国际邀请大会报告1篇;被包括Nature等多种SCI期刊引用,累积超过上百次,部分成果被收入国外"Polymer Liquid Crystals:From Structure to Application"和"Thermodynamics of Polymer Blends"等学术专著中。先后负责承担国家和省部级项目17项,其中包括国家自然科学基金项目7项(重点项目3项),国际合作项目2项、国家经贸委高科技产业化项目1项。曾获教育部科技进步奖。获授权发明专利2项。
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成果阅读
204
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成果数
4
李光宪, Yajiang Huanga, Sujun Jianga, Guangxian Lia, b, *, Dahua Chena
Acta Materialia 53(2005)5117-5124,-0001,():
-1年11月30日
The phase boundaries of untreated silica-filled and unfilled poly(methyl methacrylate) (PMMA)/poly(styrene-stat-acrylonitrile) (SAN) blends were determined by dynamic shear rheology. The Flory-Huggins interaction parameter was also calculated according to the determined phase diagram after taking into account the composition change of the mixture matrix due to the incorporation of filler. It was found that, in comparison with the unfilled PMMA/SAN blends, the phase separation temperature of the filled polymer blend was increased, and the thermodynamic interaction parameter was correspondingly decreased, suggesting that the phase stability of PMMA/SAN mixtures is enhanced by the incorporation of silica. A mechanism for this phenomenon was proposed based on the selective adsorption of PMMA chains on silica particles. The adsorption of high molecular weight fraction of PMMA chains onto the surface of silica particles would decrease the average molecular weight of PMMA in the bulk matrix that would favor the miscibility of PMMA/SAN blends in the matrix, therefore leading to the increase of the phase separation temperature of blends in the bulk. In addition, the adsorption of PMMA also changed the blend composition ratio in the bulk matrix, which would cause a complicated influence on the phase separation temperature too.
Phase stability, Dynamic shear rheology, Polymer blends, Fillers
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【期刊论文】Study on the UCST behavior of polystyrene/poly(styrene-co-acrylonitrile) blend
李光宪, Qi Yang*, Yimin Mao, Guangxian Li, Yajiang Huang, Ping Tang, Caihong Lei
Materials Letters 58(2004)3939-3944,-0001,():
-1年11月30日
The miscibility of binary polymer blends of polystyrene/poly (styrene-co-acrylonitrile) (PS/SAN) was predicted based on both Flory's equation of state theory (EOS) and Wolf's theory on binary polymer blends of the A/A-B type. The calculating results suggested that PS/SAN blend exhibits the upper critical solution temperature (UCST) behavior within acrylonitrile's volume fraction range of 4-20%. PS/SAN blends were studied with the Small Angle Light Scattering (SALS) method to test the theoretical prediction. It showed that PS/SAN (AN: 20vol.%) blend (49/51wt.%) displays UCST behavior and the UCST temperature was about 171 8C. The calculating and the experimental results were in accordance with each other relatively well.
Light scattering, UCST behavior, Polystyrene/, poly (, styrene-co-acrylonitrile),
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【期刊论文】Phase behaviour of SMMA and SAN blends using Flory's equation of state theory
李光宪, P. Tanga, G.X. Lia, J.S. Higginsb, *, V. Arrighic, J.T. Cabralb
Polymer 34(2002)6661-6667,-0001,():
-1年11月30日
The thermodynamic phase behaviour of blends composed of two random copolymers of polystyrene-co-methyl methacrylate (SMMA) and polystyrene-co-acrylonitrile (SAN) was studied using a modified Florys equation of state (EOS) theory. Light scattering measurements indicated that SMMA and SAN are miscible within certain copolymer composition ranges and exhibit lower critical solution temperature behaviour. The temperature, at which phase separation is observed, changes with the copolymer composition. The segmental interaction energy parameters XS-MMA, XS-AN and XMMA-AN were calculated using a binary interaction model by fitting the lowest temperature in the calculated spinodal boundary from EOS theory to the experimental data for several copolymer compositions. It was found that EOS theory, originally used for binary polymer solutions, could be modified and successfully extended to simulate the phase boundaries of random copolymer blends, when using Flory's mixing rule to calculate the equation of state parameters for the copolymers from those of the constituent monomer segments.
Copolymers, Polymer blends, Equation of state theory
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【期刊论文】Studies on the thermal degradation of poly (phenylene sulfide sulfone)
李光宪, Huadong Wanga, Jie Yangb, *, Shengru Longb, Xiaojun Wangc, Zheng Yangb, Guangxian Lic
Polymer Degradation and Stability 83(2004)229-235,-0001,():
-1年11月30日
The thermal degradation of poly(phenylene sulfide sulfone) PPSS was studied by thermogravimetricanalysis to determine the reaction mechanism. Several tests were carried out at different heating rates. The influence of the heating rate in dynamic measurements (5-40Cmin) on kinetic parameters, such as activation energies, was also studied. The activation energy of the solidstate process was determined to be 214kJ/mol using Kissinger's method, which does not require knowledge of the reaction mechanism. The value of the activation energy obtained using Flynn-Wall-Ozawa method was in agreement with that using Kissinger's method. Different reaction mechanisms were used to compare with this value. Also the experimental data were compared to master curves. Analysis of the experimental results suggested that the actual reaction mechanism was a Dn deceleration type.
Thermal degradation, Kineticanalysis, Poly (, phenylene sulfide sulfone), , Activation energies
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