Polycaprolactam(PA6)is an important engineering plastic known for its excellent strength and processability,making it widely applicable in the automotive and transportation industries.Previous studies have demonstrate...Polycaprolactam(PA6)is an important engineering plastic known for its excellent strength and processability,making it widely applicable in the automotive and transportation industries.Previous studies have demonstrated that incorporating a small amount of organic-modified montmorillonite(OMMT)can significantly enhance the gas barrier properties of PA6.Based on PA6/OMMT,this study further introduced maleic anhydride-grafted ethylene-octyl copolymer(mPOE)and polytetrafluoroethylene(PTFE).Morphological characterization revealed the successful manipulation of the microstructure within this toughening system,revealing a distinctive tassel bundle morphology in the ternary blend of PA6/mPOE/PTFE.in the quaternary PA6/OMMT/mPOE/PTFE system,scanning electron microscopy(SEM)analysis demonstrated that the special“tassel bundle(TB)”morphology could induce an ordered arrangement of OMMT nanosheets,leading to synergistic improvements in both toughness and gas barrier performance.These findings offer promising potential for applications requiring simultaneously high gas barrier properties and enhanced toughness,particularly in hydrogen storage tanks and related industrial fields.展开更多
Aim To investigate the melting behavior of polyamide 6 in polyamide 6/polyethy lene blends crystallized from amorphous state. Methods DSC was used to test effects of annealing temperature, annealing time, DS...Aim To investigate the melting behavior of polyamide 6 in polyamide 6/polyethy lene blends crystallized from amorphous state. Methods DSC was used to test effects of annealing temperature, annealing time, DSC scan rate, and the step wise annealing on the melting peaks of the ice water quenched specimens. Results and Conclusion Varied melting peaks of PA6 component were obtained. The degree of perfection and the crystallization degree of PA6 crystals decreased in the blends, and the crystallization degree of PA6 increased with the increasing of the annealing time. The height of the upper melting peak of reference PA6 is higher than that in blends.展开更多
Aim To investigate the multiple melting behavior of polyamide 6(PA 6) in polyamide 6/linear low density polyethylene blends crystallized from the crystal amorphous state. Methods\ The effects of annealing tempera...Aim To investigate the multiple melting behavior of polyamide 6(PA 6) in polyamide 6/linear low density polyethylene blends crystallized from the crystal amorphous state. Methods\ The effects of annealing temperature, annealing time, heating rate, and the step wise annealing were measured by DSC. Results and Conclusion\ There exists a critical heating rate affecting the middle temperature melting peak. When annealed at the temperature close to the melting peak, the main melting peak of PA 6 shifted to a higher temperature. Within a short time, annealing time has much effect on neat PA 6 but little effect on PA 6 in the blends. Addition of PE results in a decreasing in the height of melting peak. These phenomenon show that the melting behavior of PA 6 was affected by PE, compatibilizer, as well as thermal treatment.展开更多
基金financially supported by the National Natural Science Foundation of China(No.52372282)。
文摘Polycaprolactam(PA6)is an important engineering plastic known for its excellent strength and processability,making it widely applicable in the automotive and transportation industries.Previous studies have demonstrated that incorporating a small amount of organic-modified montmorillonite(OMMT)can significantly enhance the gas barrier properties of PA6.Based on PA6/OMMT,this study further introduced maleic anhydride-grafted ethylene-octyl copolymer(mPOE)and polytetrafluoroethylene(PTFE).Morphological characterization revealed the successful manipulation of the microstructure within this toughening system,revealing a distinctive tassel bundle morphology in the ternary blend of PA6/mPOE/PTFE.in the quaternary PA6/OMMT/mPOE/PTFE system,scanning electron microscopy(SEM)analysis demonstrated that the special“tassel bundle(TB)”morphology could induce an ordered arrangement of OMMT nanosheets,leading to synergistic improvements in both toughness and gas barrier performance.These findings offer promising potential for applications requiring simultaneously high gas barrier properties and enhanced toughness,particularly in hydrogen storage tanks and related industrial fields.
文摘Aim To investigate the melting behavior of polyamide 6 in polyamide 6/polyethy lene blends crystallized from amorphous state. Methods DSC was used to test effects of annealing temperature, annealing time, DSC scan rate, and the step wise annealing on the melting peaks of the ice water quenched specimens. Results and Conclusion Varied melting peaks of PA6 component were obtained. The degree of perfection and the crystallization degree of PA6 crystals decreased in the blends, and the crystallization degree of PA6 increased with the increasing of the annealing time. The height of the upper melting peak of reference PA6 is higher than that in blends.
文摘Aim To investigate the multiple melting behavior of polyamide 6(PA 6) in polyamide 6/linear low density polyethylene blends crystallized from the crystal amorphous state. Methods\ The effects of annealing temperature, annealing time, heating rate, and the step wise annealing were measured by DSC. Results and Conclusion\ There exists a critical heating rate affecting the middle temperature melting peak. When annealed at the temperature close to the melting peak, the main melting peak of PA 6 shifted to a higher temperature. Within a short time, annealing time has much effect on neat PA 6 but little effect on PA 6 in the blends. Addition of PE results in a decreasing in the height of melting peak. These phenomenon show that the melting behavior of PA 6 was affected by PE, compatibilizer, as well as thermal treatment.
