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yuxuebing

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Macromol. Chem. Phys. 2004, 205, 1385¨C1393

All steps were run semi-continuously, on the basis of a PS seed.
A 1 l flask with a stirrer and a reflux condenser was filled at
75 8C under Ar with a cold suspension of 217 g deionized
water, 0.4 g butandiol diacrylate (BDDA), 3.6 g styrene, 75 mg
sodium dodecylsulfate (SDS) and 50 mg sodium dithionite.
The polymerization was started immediately by adding 250mg
ammonium peroxodisulfate and 50 mg sodium dithionite (PS
seed). After 10 min, a suspension of 6.6 g BDDA, 59.4 g
styrene, 0.3 g SDS, 0.1 g KOH and 90 g water was added
continuously over 3 h (PS core). After an additional 30 min, a
suspension of 3 g allyl methacrylate, 27 g methyl methacrylate,
0.15 g SDS and 40 g water was added continuously within
90 min (PMMA interlayer). After 30 min, a suspension of
64.4 g butyl acrylate, 64.4 g ethyl acrylate, 1.3 g acrylic acid,
0.33 g SDS and 120 g water was added continuously over
240 min (PEAcoPBA shell). The copolymer PEAcoPBA
produces remarkably few secondary nuclei. The acrylic acid
helps to stabilize the latex spheres which are quite large.
The latex, containing 32 wt.-% polymer, was coagulated in
methanol, filtered and dried to isolate the polymer. The final
particle size was controlled by the concentration of initiator
and the emulsifier in the initial batch-step. Both were kept low
to prevent secondary nucleation.

[ Last edited by yuxuebing on 2011-6-24 at 11:21 ]
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yuxuebing(½ð±Ò+1): 2011-07-14 21:19:09
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soarandcoffe

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yuxuebing

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Originally posted by soarandcoffe at 2011-06-24 15:52:17:
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