High performance plastic resins PEK-C

PES

PEI and PSU were mixed with organoclay CH3(CH2)17 (CH3)3N3+-Montmorillonite in solution．The XRD results revealed that the PEK-C and PES were very easy to intercalate into the clay and drove the clay to exfoliate

as a result

exfoliated polymer／clay nanocomposites were obtained．On the contray

PEI and PSU could not intercalate into the clay．The possible reasons caused these different results might be that the interaction between the former two polymers and clay were strong while the interaction between the latter two polymers and clay were weak．The Tgs of PEK-C／clay and PES／clay nanocomposites were 210℃ and 229℃

much lower than that of pure PEK-C and PES

which were 227℃ and 237℃

respectively．But the decomposing temperatures Td of PEK-C and PES rose from 469℃ to 507℃ and from 514℃ to 579℃ after mixed with clay

increased 38℃ and 65℃

respectively．For the polymer PEI and PSU

which could not intercalate into the clay

both their Tg and Td changed little after mixed with the clay．The positron annihilation life time spectroscopy results indicated that larger free volumes formed as PEK-C combined with clay

which was supposed to be responsible for the decreases of its Tg．