A novel controllable cross\|linking PEEK was synthesized by introducing thioether moieties into PEEK rigid chain, in which sulfur acts as a cross\|linking point. It is found that the cross\|linking reaction could take...A novel controllable cross\|linking PEEK was synthesized by introducing thioether moieties into PEEK rigid chain, in which sulfur acts as a cross\|linking point. It is found that the cross\|linking reaction could take place at 623 K over a period of 5 h. The novel material has an excellent thermal stability and mechanical properties. It can be processed as convenient as that of pure PEEK before cross\|linking and has a high application temperature as thermosetting resin after cross\|linking.展开更多
A novel controllable cross-linking PEEK was synthesized by introducing thioether moieties into PEEK rigid chain, which was combined with merits of thermoplastic material and thermosetting material because it can be pr...A novel controllable cross-linking PEEK was synthesized by introducing thioether moieties into PEEK rigid chain, which was combined with merits of thermoplastic material and thermosetting material because it can be processed as a thermoplastic material before cross-linking and be applied as a thermosetting material after being crosslinked by electron beam and heat cross-linking reaction. In this paper, we mainly discussed the rheological behavior of controllable cross-linking PEEK at a dynamic time and 653 K. The variation of modulus and complex viscosity and rheological regularity of the materials with different molecular weights were investigated by tracking and monitoring process of cross-linking reaction using retary rheometer. The relationship between structures and properties of controllable cross-linking PEEK was explored.展开更多
Phase behavior in blends of liquid crystalline poly(aryl ether ketone) (C-PAEK) and poly(aryl(ether) ketone) containing 4-methyl phenyl groups(T-PAEK) was investigated by differential scanning calorimetry(DSC),polariz...Phase behavior in blends of liquid crystalline poly(aryl ether ketone) (C-PAEK) and poly(aryl(ether) ketone) containing 4-methyl phenyl groups(T-PAEK) was investigated by differential scanning calorimetry(DSC),polarized light microscopy(PLM) and atomic force microscopy(AFM) techniques.In both(C-PAEK-rich) and T-PAEK-rich blends,the two components are molecular miscible in the melting state.For the 80/20 C-PAEK/T-PAEK blend,the bright core and rings are mainly composed of C-PAEK phase and dark rings consist of T-PAEK phase in the ring-banded spherulites.The development of the ring-banded spherulites in the C-PAEK/T-PAEK blends is a rhythmic growth process,and thus it is consistent with the structural discontinuity model proposed by Padden and Keith based on polyethylene spherulites.展开更多
Dynamic mechanical analysis(DMA) was used to investigate the dynamic mechanical and thermal properties of the controllable cross-linking poly(ether ether ketone)s containing thioether bond and pure poly(ether ether ke...Dynamic mechanical analysis(DMA) was used to investigate the dynamic mechanical and thermal properties of the controllable cross-linking poly(ether ether ketone)s containing thioether bond and pure poly(ether ether ketone). The processes of cross-linking reaction were monitored with the changes in storage modulus(E′) and tanδ with the change of temperature. The storage modulus(E′) increases in the high temperature region and tanδ shifts toward high temperature with increasing the degree of cross-linking. Comparing dynamic mechanical properties of pure poly(ether ether ketone) with that of the controllable cross-linking poly(ether ether ketone)s, we can conclude that the cross-linking reaction could occurred at the sites of thioether bonds. The novel polymer can be processed as conveniently as thermoplastic material before cross-linking and has a high application temperature as thermosetting material after cross-linking. It can be applied to a new technological region.展开更多
文摘A novel controllable cross\|linking PEEK was synthesized by introducing thioether moieties into PEEK rigid chain, in which sulfur acts as a cross\|linking point. It is found that the cross\|linking reaction could take place at 623 K over a period of 5 h. The novel material has an excellent thermal stability and mechanical properties. It can be processed as convenient as that of pure PEEK before cross\|linking and has a high application temperature as thermosetting resin after cross\|linking.
文摘A novel controllable cross-linking PEEK was synthesized by introducing thioether moieties into PEEK rigid chain, which was combined with merits of thermoplastic material and thermosetting material because it can be processed as a thermoplastic material before cross-linking and be applied as a thermosetting material after being crosslinked by electron beam and heat cross-linking reaction. In this paper, we mainly discussed the rheological behavior of controllable cross-linking PEEK at a dynamic time and 653 K. The variation of modulus and complex viscosity and rheological regularity of the materials with different molecular weights were investigated by tracking and monitoring process of cross-linking reaction using retary rheometer. The relationship between structures and properties of controllable cross-linking PEEK was explored.
文摘Phase behavior in blends of liquid crystalline poly(aryl ether ketone) (C-PAEK) and poly(aryl(ether) ketone) containing 4-methyl phenyl groups(T-PAEK) was investigated by differential scanning calorimetry(DSC),polarized light microscopy(PLM) and atomic force microscopy(AFM) techniques.In both(C-PAEK-rich) and T-PAEK-rich blends,the two components are molecular miscible in the melting state.For the 80/20 C-PAEK/T-PAEK blend,the bright core and rings are mainly composed of C-PAEK phase and dark rings consist of T-PAEK phase in the ring-banded spherulites.The development of the ring-banded spherulites in the C-PAEK/T-PAEK blends is a rhythmic growth process,and thus it is consistent with the structural discontinuity model proposed by Padden and Keith based on polyethylene spherulites.
文摘Dynamic mechanical analysis(DMA) was used to investigate the dynamic mechanical and thermal properties of the controllable cross-linking poly(ether ether ketone)s containing thioether bond and pure poly(ether ether ketone). The processes of cross-linking reaction were monitored with the changes in storage modulus(E′) and tanδ with the change of temperature. The storage modulus(E′) increases in the high temperature region and tanδ shifts toward high temperature with increasing the degree of cross-linking. Comparing dynamic mechanical properties of pure poly(ether ether ketone) with that of the controllable cross-linking poly(ether ether ketone)s, we can conclude that the cross-linking reaction could occurred at the sites of thioether bonds. The novel polymer can be processed as conveniently as thermoplastic material before cross-linking and has a high application temperature as thermosetting material after cross-linking. It can be applied to a new technological region.
