With monomer of A_aB_b type, the sol fraction of polycondensation for post-gel, in whichnot only the functional groups of A to react with those of B, but also the functional groupsof A with those of A and the function...With monomer of A_aB_b type, the sol fraction of polycondensation for post-gel, in whichnot only the functional groups of A to react with those of B, but also the functional groupsof A with those of A and the functional groups of B with those of B are involved, is discuss-ed in detail. As a direct result, the gelation condition is obtained explicitly.展开更多
For the polycondensation reaction of A_a<B_b(C_c) type, the sol fraction for post-gel is investigated from probability consideration to approach gelation condition as a limitation. Furthermore, by means of a direct...For the polycondensation reaction of A_a<B_b(C_c) type, the sol fraction for post-gel is investigated from probability consideration to approach gelation condition as a limitation. Furthermore, by means of a direct differentiation technique, a recursion formula is proposed for the evaluation of polymer moments in explicit forms for both pre-gel and post-gel.展开更多
The dual-bath coagulation method was used for the preparation of PES membrane in this experiment. The main intent of this stndy was to assess the efforts of gelation conditions on the structures and properties. The d...The dual-bath coagulation method was used for the preparation of PES membrane in this experiment. The main intent of this stndy was to assess the efforts of gelation conditions on the structures and properties. The dense top layer as well as porous supporting layer can be made by duel-bath coagulation method simultaneous- ly. Different internal quench medium obtained different membrane with different structures. With the increase in time in the first coagulation bath, pure water flux decreased and the clearance rates of urea and creatinine both first increased then decreased and increased slightly in the end. With the temperature of the second coagtdation bath increasing, pure water flux increases and the clearance rates of urea and creatinine first increases then de- creases and increases a little at last. Higher DMSO concentration （wt/wt） in the second coagulation bath results in the increase of pure water flux and the decrease of urea ＆ creatinine clearance rates.展开更多
基金the National Natural Science Foundation of China.
文摘With monomer of A_aB_b type, the sol fraction of polycondensation for post-gel, in whichnot only the functional groups of A to react with those of B, but also the functional groupsof A with those of A and the functional groups of B with those of B are involved, is discuss-ed in detail. As a direct result, the gelation condition is obtained explicitly.
文摘For the polycondensation reaction of A_a<B_b(C_c) type, the sol fraction for post-gel is investigated from probability consideration to approach gelation condition as a limitation. Furthermore, by means of a direct differentiation technique, a recursion formula is proposed for the evaluation of polymer moments in explicit forms for both pre-gel and post-gel.
文摘The dual-bath coagulation method was used for the preparation of PES membrane in this experiment. The main intent of this stndy was to assess the efforts of gelation conditions on the structures and properties. The dense top layer as well as porous supporting layer can be made by duel-bath coagulation method simultaneous- ly. Different internal quench medium obtained different membrane with different structures. With the increase in time in the first coagulation bath, pure water flux decreased and the clearance rates of urea and creatinine both first increased then decreased and increased slightly in the end. With the temperature of the second coagtdation bath increasing, pure water flux increases and the clearance rates of urea and creatinine first increases then de- creases and increases a little at last. Higher DMSO concentration （wt/wt） in the second coagulation bath results in the increase of pure water flux and the decrease of urea ＆ creatinine clearance rates.
