A series of H-shaped （PS）2PEG（PS）2 block copolymers with different PS chain lengths were prepared. The influence of different confinements active on the crystallization and self-nucleation （SN） behavior of the P...A series of H-shaped （PS）2PEG（PS）2 block copolymers with different PS chain lengths were prepared. The influence of different confinements active on the crystallization and self-nucleation （SN） behavior of the PEG blocks was investigated by differential scanning calorimetry （DSC）. When the content of the crystalline block was high, a classical SN behavior was obtained. The block copolymer with PEG content of 49% （by weight） showed a classical SN behavior with a narrow self-nucleation domain and had bimodal crystallization exotherms. When the PEG dispersed as separated microdomains in the block copolymer, the self-nucleation domain disappeared and only annealing was observed.展开更多
The title compound, [Cu2（CH3COO）4（C8H10N2）]n·nCH3CN 1 （C8H10N2, 4,4＇-bipy = 4,4＇-bipyridine）, has been solvothermally synthesized in CH3CN and characterized by X-ray diffraction. The crystal is of monocli...The title compound, [Cu2（CH3COO）4（C8H10N2）]n·nCH3CN 1 （C8H10N2, 4,4＇-bipy = 4,4＇-bipyridine）, has been solvothermally synthesized in CH3CN and characterized by X-ray diffraction. The crystal is of monoclinic, space group Cc with α = 22.626（6）, b = 14.012（4）, c = 15.106（4） ]A, β = 107.610（3）°, V = 4565（2） ]A^3, C20H23Cu2N3O8, Mr = 560.49, Z = 8, Dc = 1.631 g/cm^3,μ = 1.914 mm^-1, Flack parameter = 0.48（1）, F（000） = 2288, R = 0.042 and wR = 0.098 for 8887 observed reflections （I 〉 20（I））. It consists of nearly linear one-dimensional chains [Cu2（CH3COO）4（C8H10N2）]n derived from paddle-wheel [Cu2（CH3COO）4] unit linked by 4,4＇-bipy, and CH3CN as guest molecule regularly decorates between the chains.展开更多
基金supported by the National Natural Science Foundation of China(No.50503022)Programs and the Fund for Creative Research Groups(No.50621302)
文摘A series of H-shaped （PS）2PEG（PS）2 block copolymers with different PS chain lengths were prepared. The influence of different confinements active on the crystallization and self-nucleation （SN） behavior of the PEG blocks was investigated by differential scanning calorimetry （DSC）. When the content of the crystalline block was high, a classical SN behavior was obtained. The block copolymer with PEG content of 49% （by weight） showed a classical SN behavior with a narrow self-nucleation domain and had bimodal crystallization exotherms. When the PEG dispersed as separated microdomains in the block copolymer, the self-nucleation domain disappeared and only annealing was observed.
基金The work was supported by the Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces (No. 0506) and the University of Malaya (F0712/2005c)
文摘The title compound, [Cu2（CH3COO）4（C8H10N2）]n·nCH3CN 1 （C8H10N2, 4,4＇-bipy = 4,4＇-bipyridine）, has been solvothermally synthesized in CH3CN and characterized by X-ray diffraction. The crystal is of monoclinic, space group Cc with α = 22.626（6）, b = 14.012（4）, c = 15.106（4） ]A, β = 107.610（3）°, V = 4565（2） ]A^3, C20H23Cu2N3O8, Mr = 560.49, Z = 8, Dc = 1.631 g/cm^3,μ = 1.914 mm^-1, Flack parameter = 0.48（1）, F（000） = 2288, R = 0.042 and wR = 0.098 for 8887 observed reflections （I 〉 20（I））. It consists of nearly linear one-dimensional chains [Cu2（CH3COO）4（C8H10N2）]n derived from paddle-wheel [Cu2（CH3COO）4] unit linked by 4,4＇-bipy, and CH3CN as guest molecule regularly decorates between the chains.
