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Week:01/27/2014 to 02/02/2014

From Cochran Research Group

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  • Triblock synthesis with 0.41 0.4 0.19 Vf-started on started 012814
    • After PS terminated because of Air crack in reactor
    • GPC - shows good PS block - so stored for Homopolymer PS
    • GPC: PS- 27470, 1.027
  • Triblock synthesis with 0.41 0.4 0.19 Vf-started on Tue. (New Isoprene) started 012914
    • Consistent with limits of Eric thesis for ISO and Bates,1999 journal article for Q230 group (Double Gyroid)
    • PS PI PDMS 13.1g 8.15 g 16.4 g 0.566 ml 19150,11925,11925 43K
    • Total wt 28.1 g (020114) should be 29.45
    • GPC: PS-18042, 1.022, Tri-42562 1.09 Very close to targeted values
    • 1.jpg
    • NMR: by taking MeOH peak at 3.4 ppm as ref.; calculating integrals for all blocks and using excel sheet
    • NMR: PS - 18042 (From GPC); PS-PI - 31174 (PI-13132); PS_PI_PDMS - 44314 (PDMS-13140)
    • Tri 012914-for PMW.jpeg
  • Stirred Cell reactor exp. for 041213 Triblock wit DP heated/dried TBAF etched membrane on Filter paper casted with toluene
    • See below for details
  • Nanocomp. layering on Silicon wafer
    • Ordered P type (110) 3" 35$ - shipped arrives 020514
  • NMR for oil on TBAF membrane,Triblock
    • Done - for triblock see below for details
    • For Oil on TBAF - shows no trace of PS or PI or PDMS
    • So may be all PDMS gone as gas
  • Membrane casting with 0.5 mm thick Mold casting plates
    • Not uniform casting, sticks to Teflon plates
    • Needs more tuning - control time of heat, amount of polymer in mold and good non stick properties
    • Tried with 04122013 n PS_PDMS
  • Triblock 012114
    • GPC doesnt show any increase in PMW but there is total weight increase corresponding to PDMS
    • NMR shows PDMS peak at 0 ppm and the integral of PS n PDMS peak correlate suggesting that there is 1 PS block for every PDMS block
  • Stirred Cell reactor exp. with Solvent casted membranes
    • Membrane tested- w/ DP n TBAF etched 04120214 poly - at 2 bar 250 ml in 280 s so 0.89 ml/s
    • Baseline studied with normal filter paper - at 2 bar, with stirring 280 ml in 202 s so 1.39 ml/s
    • Flowrates nearly incrased 60%
  • Crosslinking 04122013 Triblock with DP
    • Started 013114 DP (iso bonds: DP - 8:1) 1.5 g Triblock 5 g in 35 ml DCM stirred 1 day, MeOH precipitated
    • Dried in vacuo at room temp. 010214
    • Dried poly. wt. 3.95 g
  • Membrane casting with above poly. using toluene
    • 2.3 g of above poly. casted on filter paper in petri dish with 30 ml of toluene
    • Filter paper: Whatman grade 1 70 mm dia. 11 um particle retention, cut to 49 mm and used
  • Rheology for triblock 012114
    • Not done because equipment not good
  • Mold for membrane casting
    • SS block mold - 60 mm wide and 25 mm thick;hole - 50 mm wide and 15 mm deep; Cylinder - 50 mm wide and 25 mm length
    • PTFE coating for a max. of 5 sets like this a min. charge of 300$
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