The present paper covers the phase behavior of poly(pbenzamide)(PBA)/Nylon 6/H 2SO 4 and poly(pphenylene terephthalamide) (PPTA)/Nylon 6/H 2SO 4 systems. The transition temperatures detected by the Depolarized L...The present paper covers the phase behavior of poly(pbenzamide)(PBA)/Nylon 6/H 2SO 4 and poly(pphenylene terephthalamide) (PPTA)/Nylon 6/H 2SO 4 systems. The transition temperatures detected by the Depolarized Light Intensity measurements were used to construct the phase diagram in which the influence of temperature was shown. The enhanced depolarized light intensity observed in the ternary system suggests that the coil polymer chains may tend to be extended and contribute to the overall anisotropy of the liquid crystal phase.展开更多
The lattice theory regarding ternary systems involving a conformationally variable polypeptide and a randomly coiled polymer presented recently is extended to the case where an external orientational field is present....The lattice theory regarding ternary systems involving a conformationally variable polypeptide and a randomly coiled polymer presented recently is extended to the case where an external orientational field is present.Chemical potentials of the components in the isotropic and anisotropic phases were obtained.The calculations carried out show that the external field exerts a marked effect on the phase behavior of the ternary systems.The isotropic-anisotropic biphasic gap is predicted to shift to lower polymer concentrations and become narrower when the external field exists.The entrance of the randomly coiled polymers into the anisotropic phase is promoted.Influences of chain conformation of polypeptide,chain length and temperature have been studied in the presence of the external field.The comparison between theory and experimental results was also carried out.展开更多
基金Supported by the National Natural Science Foundation of China(Grant No.59803002) and the State EducationalMinistry for the Ove
文摘The present paper covers the phase behavior of poly(pbenzamide)(PBA)/Nylon 6/H 2SO 4 and poly(pphenylene terephthalamide) (PPTA)/Nylon 6/H 2SO 4 systems. The transition temperatures detected by the Depolarized Light Intensity measurements were used to construct the phase diagram in which the influence of temperature was shown. The enhanced depolarized light intensity observed in the ternary system suggests that the coil polymer chains may tend to be extended and contribute to the overall anisotropy of the liquid crystal phase.
基金the National Natural Science Foundation of China(Grant No.50273011)Supports from Doctoral Foundation of Education Minis try of China(Grant No.20010251008)Shanghai Nami Project(Grant No.0352nm109)are also appreciated.
文摘The lattice theory regarding ternary systems involving a conformationally variable polypeptide and a randomly coiled polymer presented recently is extended to the case where an external orientational field is present.Chemical potentials of the components in the isotropic and anisotropic phases were obtained.The calculations carried out show that the external field exerts a marked effect on the phase behavior of the ternary systems.The isotropic-anisotropic biphasic gap is predicted to shift to lower polymer concentrations and become narrower when the external field exists.The entrance of the randomly coiled polymers into the anisotropic phase is promoted.Influences of chain conformation of polypeptide,chain length and temperature have been studied in the presence of the external field.The comparison between theory and experimental results was also carried out.
