I have prepared PVA metal organic frame work MMM using GA as across linker. At which stage I have to add the cross linker b/c I have tried to add the the linker but still it has problem during casting .I followed the following procedure.

1.5% PVA was prepared in DI.

2.2.5% by wt% MOF added and stirred for 12hrs at 90 oC

3.The cross linker mixture was added and stirred for 15min with sonication in ultrasonic bath.