STRUCTURE AND PROPERTY BLENDING OF POLYDIMETHYLSILOXANE, POLYETHYLENE GLYCOL, POLYETHER SULFONE AND POLY ACRYL NITRILE MEMBRANES WITH TETRA METHYL ORTHO SILICATE AS CROSS-LINKING AGENT

Life Sciences-Chemistry

Abstract

In this research for fabricated the composite  membranes usage a blend of polymers that are comprised of PDMS (polydimethylsiloxane), PEG (polyethylene glycol), PES (polyether sulfone) and PAN (poly acryl nitrile) as polymers, asymmetric polyester ultra-filtration membranes, PES, PVP (polyvinyl pyrrolidone) as pore former and N,N-Dimethyl acetamide (DMAc) as solvent   used for fabricated of   support layer with crosslinking TMOS (tetramethyl orthosilicate) as silica Nanoparticles (crosslinking agent), ammonia as inducer ,dibutyltindilaurate as catalystand span 80 as surfactant.In the research, four kinds of the membrane including PDMS, blend of PDMS with PEG, blend of PDMS with PES and blend of PDMS with PAN are used. The structural morphology of support and active layers of the composite membranes was characterized with SEM. in this research, crosslinking temperature and crosslinking time are fixed and 65ċ and 1 hour respectively  so  this  study  focuses  on  the  variation  of  crosslinking  agent  (TMOS)(1.5,3  ,4.4,5.8  and 7.15wt%)  upon  crosslinking  density  (),  swelling  degree  (),  %swelling  by  volume,  density  of membrane specimen (    ), volume fraction of rubber phase () and number average molecular weight between crosslink's (), is studied. It was observed that with increasing the weight of the crosslinking agent, ,    and  increased and  , %swelling by volume decreased, but changes of is erratic