The morphologies and phase diagrams exhibited by symmetric ABC star triblock copolymer nanoparticles are investigated on the basis of real-space self-consistent field theory. The ABC star triblock copolymers were chos...The morphologies and phase diagrams exhibited by symmetric ABC star triblock copolymer nanoparticles are investigated on the basis of real-space self-consistent field theory. The ABC star triblock copolymers were chosen to be tiling-forming with fixed polymer parameter and the spherical boundaries were modeled using the masking technique. We first study a number of examples where the ABC triblock copolymers confined in spherical cavities with neutral surface. Then, two types of spherical cavity distinct preferential surfaces are considered, including both A-block attractive and repulsive preferential surfaces. We aim at the effects due to various spherical cavity diameters and the degree of interactions between the polymer and the spherical surface. A variety of morphologies, such as ring-like structures, concentric sphere, and irregular cylinder, were identified in phase diagrams. The results show that both the degree of interactions and spherical diameters can influence the formation of morphologies so that ring-like structures and other novel structures could be obtained.展开更多
In this paper, the continuum self-consistent field theory （SCFT） is applied to study the structure and the interaction of the adsorption of symmetrical ABA polyampholytes （PAs） between two neutral planes. It is fo...In this paper, the continuum self-consistent field theory （SCFT） is applied to study the structure and the interaction of the adsorption of symmetrical ABA polyampholytes （PAs） between two neutral planes. It is found that the amounts of all the conformations decrease with the increase of the charge fraction of polymer chain, and increase with the increase of the bulk salt concentration and become saturated at high bulk salt concentration. The effective interaction between the two planes presented a long-range repulsion. Splitting it into various components and relating with the dependence of the variations of the conformations on environment parameters, we ,try to find the origin of the total long-range interaction between the two planes.展开更多
Using the continuum self-consistent field theory （SCFT）, the adsorption of flexible symmetrical triblock polymers onto the surfaces of two identical parallel planes immersed in a neutral solution was studied. The ef...Using the continuum self-consistent field theory （SCFT）, the adsorption of flexible symmetrical triblock polymers onto the surfaces of two identical parallel planes immersed in a neutral solution was studied. The effects of various parameters, such as the interface adhesive energy, the polymer composition and the bulk polymer concentration, on the conformations and total adsorption amount of polymers were explored. It was found that the dependence of the amount of bridges on the interface adhesion and that of the amount of tails on the length of adhesive blocks were both non-monotonous. The amounts of the four chain conformations scaled nearly linearly to the copolymer bulk concentration. The non- equivalence of the dependence of the adsorbed structure behaviors on the interface affinity and the length of sticky blocks was revealed as well.展开更多
距离向多孔径SAR模式是一种高分辨率的宽测绘带成像模式。反解运算和成像处理是距离向多孔径成像算法的两个部分,两者合理配合使用是实现多孑L径模式高精度成像的关键。该文给出了一种采用变尺度傅里叶变换(Scaled F T,scF T,)算法来实...距离向多孔径SAR模式是一种高分辨率的宽测绘带成像模式。反解运算和成像处理是距离向多孔径成像算法的两个部分,两者合理配合使用是实现多孑L径模式高精度成像的关键。该文给出了一种采用变尺度傅里叶变换(Scaled F T,scF T,)算法来实现成像处理并与反解运算结合的多孔径成像算法。与已有的处理算法比较,该算法存不显著增加计算钉杂席的条件下可获得较高的成像质量。文巾最后给m了仿真结果。展开更多
为了模拟多组分高抗冲聚丙烯(HIPP)的相分离及其形态,我们运用自洽场理论(self-consistent field theory,SCFT)研究了均聚物A/均聚物B/两嵌段共聚物A-b-B/交替共聚物(A-b-B)4四元共混体系的相分离及形态演化,着重讨论了各种组分的链长...为了模拟多组分高抗冲聚丙烯(HIPP)的相分离及其形态,我们运用自洽场理论(self-consistent field theory,SCFT)研究了均聚物A/均聚物B/两嵌段共聚物A-b-B/交替共聚物(A-b-B)4四元共混体系的相分离及形态演化,着重讨论了各种组分的链长和含量对体系形成各种多层核壳结构的影响.展开更多
The ordered patterns formed bymicrophase-separated block copolymer systems demonstrate periodic symmetry,and all periodic structures belong to one of 230 space groups.Based on this fact,a strategy of estimating the in...The ordered patterns formed bymicrophase-separated block copolymer systems demonstrate periodic symmetry,and all periodic structures belong to one of 230 space groups.Based on this fact,a strategy of estimating the initial values of self-consistent field theory to discover ordered patterns of block copolymers is developed.In particular,the initial period of the computational box is estimated by the Landau-Brazovskii model as well.By planting the strategy into the whole-space discrete method,several new metastable patterns are discovered in diblock copolymers.展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.21074096,21474076 and 31340026)the Natural Science Foundation of Zhejiang Province(Nos.Y4090174,LY12A04004,LQ12E01003 and Z13F020019)X.W thanks the funding from the Advanced Talent Program of Wenzhou
文摘The morphologies and phase diagrams exhibited by symmetric ABC star triblock copolymer nanoparticles are investigated on the basis of real-space self-consistent field theory. The ABC star triblock copolymers were chosen to be tiling-forming with fixed polymer parameter and the spherical boundaries were modeled using the masking technique. We first study a number of examples where the ABC triblock copolymers confined in spherical cavities with neutral surface. Then, two types of spherical cavity distinct preferential surfaces are considered, including both A-block attractive and repulsive preferential surfaces. We aim at the effects due to various spherical cavity diameters and the degree of interactions between the polymer and the spherical surface. A variety of morphologies, such as ring-like structures, concentric sphere, and irregular cylinder, were identified in phase diagrams. The results show that both the degree of interactions and spherical diameters can influence the formation of morphologies so that ring-like structures and other novel structures could be obtained.
基金financially supported by the National Natural Science Foundation of China(Nos.21374011 and 21434001)973 project 2011CB808502
文摘In this paper, the continuum self-consistent field theory （SCFT） is applied to study the structure and the interaction of the adsorption of symmetrical ABA polyampholytes （PAs） between two neutral planes. It is found that the amounts of all the conformations decrease with the increase of the charge fraction of polymer chain, and increase with the increase of the bulk salt concentration and become saturated at high bulk salt concentration. The effective interaction between the two planes presented a long-range repulsion. Splitting it into various components and relating with the dependence of the variations of the conformations on environment parameters, we ,try to find the origin of the total long-range interaction between the two planes.
基金financially supported by the National Natural Science Foundation of China(Nos.21374011 and 21434001)
文摘Using the continuum self-consistent field theory （SCFT）, the adsorption of flexible symmetrical triblock polymers onto the surfaces of two identical parallel planes immersed in a neutral solution was studied. The effects of various parameters, such as the interface adhesive energy, the polymer composition and the bulk polymer concentration, on the conformations and total adsorption amount of polymers were explored. It was found that the dependence of the amount of bridges on the interface adhesion and that of the amount of tails on the length of adhesive blocks were both non-monotonous. The amounts of the four chain conformations scaled nearly linearly to the copolymer bulk concentration. The non- equivalence of the dependence of the adsorbed structure behaviors on the interface affinity and the length of sticky blocks was revealed as well.
文摘距离向多孔径SAR模式是一种高分辨率的宽测绘带成像模式。反解运算和成像处理是距离向多孔径成像算法的两个部分,两者合理配合使用是实现多孑L径模式高精度成像的关键。该文给出了一种采用变尺度傅里叶变换(Scaled F T,scF T,)算法来实现成像处理并与反解运算结合的多孔径成像算法。与已有的处理算法比较,该算法存不显著增加计算钉杂席的条件下可获得较高的成像质量。文巾最后给m了仿真结果。
文摘为了模拟多组分高抗冲聚丙烯(HIPP)的相分离及其形态,我们运用自洽场理论(self-consistent field theory,SCFT)研究了均聚物A/均聚物B/两嵌段共聚物A-b-B/交替共聚物(A-b-B)4四元共混体系的相分离及形态演化,着重讨论了各种组分的链长和含量对体系形成各种多层核壳结构的影响.
基金supported by grants from National Natural Science Foundation of China(50930003)supported in part by the Key Project of National Natural Science Foundation of China(Grant No.11031006)+2 种基金the Natural Science Foundation of Hunan Province(Grant No.10JJ7001)supported by Junzheng Foundation of Peking University.supported by Visit Project of Beijing International Center for Mathematical Research and China Postdoctoral Science Foundation(Grant No.2011M500179).
文摘The ordered patterns formed bymicrophase-separated block copolymer systems demonstrate periodic symmetry,and all periodic structures belong to one of 230 space groups.Based on this fact,a strategy of estimating the initial values of self-consistent field theory to discover ordered patterns of block copolymers is developed.In particular,the initial period of the computational box is estimated by the Landau-Brazovskii model as well.By planting the strategy into the whole-space discrete method,several new metastable patterns are discovered in diblock copolymers.
