The nonisothermal crystallization kinetics of PEEK-PEDEK block copolymers was studied and the results showed that the Avrami exponent n of each sample was generally larger than 3, which indicates the initial crystalli...The nonisothermal crystallization kinetics of PEEK-PEDEK block copolymers was studied and the results showed that the Avrami exponent n of each sample was generally larger than 3, which indicates the initial crystallization of the complex. The crystallization behavior could be described as heterogeneous, multi-dimensional spherical growth with thermal nucleation. The activation energy was calculated and was explained with the constitution changes of the molecular chains that caused by the introduction of biphenyl moiety.展开更多
A new metal-organic polymer Mn3（BTC）2(H2O)9·(H2O) was synthesized by reaction of the metal ions Mn（Ⅱ） with 1,3,5-benzenetricarboxylic acid(H3BTC) in a mixed solution of DMF/C2H5OH/(H2O) and crystallized.The ...A new metal-organic polymer Mn3（BTC）2(H2O)9·(H2O) was synthesized by reaction of the metal ions Mn（Ⅱ） with 1,3,5-benzenetricarboxylic acid(H3BTC) in a mixed solution of DMF/C2H5OH/(H2O) and crystallized.The crystal belongs to monoclinic system,space group C2/c with a=1.901 4（4） nm,b=0.740 23（15） nm,c=2.044 9（4） nm,β=97.18（3）°,V=2.855 5（10） nm3,Z=4,Dc=1.766（g/cm3）,μ（Mo Kα）=1.401 mm-1,R[I>2σ（I）]=0.072 7,wR=0.235 1 for 2 419 independent reflections with goodness-of-fit 1.046. Its structure possesses bilayer architectures constructed from Mn ions linked infinite Mn（BTC） chains which were build up from BTC ligand as the "T-shape" module and Mn as the linear module.The hydrogen-bond and π-π stacking interactions between bilayers make them three-dimensional channel-like interpenetrated frameworks.展开更多
文摘The nonisothermal crystallization kinetics of PEEK-PEDEK block copolymers was studied and the results showed that the Avrami exponent n of each sample was generally larger than 3, which indicates the initial crystallization of the complex. The crystallization behavior could be described as heterogeneous, multi-dimensional spherical growth with thermal nucleation. The activation energy was calculated and was explained with the constitution changes of the molecular chains that caused by the introduction of biphenyl moiety.
文摘A new metal-organic polymer Mn3（BTC）2(H2O)9·(H2O) was synthesized by reaction of the metal ions Mn（Ⅱ） with 1,3,5-benzenetricarboxylic acid(H3BTC) in a mixed solution of DMF/C2H5OH/(H2O) and crystallized.The crystal belongs to monoclinic system,space group C2/c with a=1.901 4（4） nm,b=0.740 23（15） nm,c=2.044 9（4） nm,β=97.18（3）°,V=2.855 5（10） nm3,Z=4,Dc=1.766（g/cm3）,μ（Mo Kα）=1.401 mm-1,R[I>2σ（I）]=0.072 7,wR=0.235 1 for 2 419 independent reflections with goodness-of-fit 1.046. Its structure possesses bilayer architectures constructed from Mn ions linked infinite Mn（BTC） chains which were build up from BTC ligand as the "T-shape" module and Mn as the linear module.The hydrogen-bond and π-π stacking interactions between bilayers make them three-dimensional channel-like interpenetrated frameworks.
