Polydimethylsiloxane

Report
化工四
B95504050 劉邦彥
B95504048 彭子軒
B95504052 林文翔
Questions Review
 Tyler mesh size is the number of openings per (linear)
inch of mesh.
 1800 mesh = 10 μm
 100~6000 mesh = 3~149 μm
Questions Review
Rochow
DMDCS
S1
Hydrolysis
D4
MD2M
CH3Cl
XMXCS
Rochow
S1
H2O
DMDCS
S3
CH3Cl
H2O
Methanolysis
H2O
CH3Cl
S2
D4
MD2M
H2O
HCl
S2
Cyclization
CH3OH
HCl
Cyclization
Avoid acid waste ,making the process
cleaner and more efficient.
Ring-Open Polycondensation
 Yield high polymer from ROP of cyclic oligomer.
 Allow to synthesis high Mn with great precision.
 Formation of PDMS from D4 is commonly used in
industry.
 Two kinds of ROP:
 Anionic Polymerization
 Cationic Polymerization
Anionic Polymerization
Initiation
Propagation
Anionic Polymerization
 Catalyst: KOH
 Condition: 0.01% 140℃
 Product:
 Mn: 8.84×105
 Rxn Time: 90min
 Conversion: 84%
 HP conversion: 76%
 Solubility Problem
Cationic Polymerization
Initiation
Propagation
Cationic Polymerization
 Catalyst: CF3SO3H H2SO4
 Condition: 8.7×10-4M 20℃
 Product:
 Mn: 1.4×105
 Rxn Time: 90min
 Conversion: 85%
 HP Conversion: 60%
 Corrosion Problem.
 Triflic acid: 140,000 NTD/kg
Ring-Open Polycondensation
 Small cyclic siloxane will be formed.
[D4]o= 1.19M; [TfOH]0 = 8.47.10-4 M
Viscosity
 Mn Range: 105~106
 Viscosity:
 At 140℃[cP]: ~105
 At 25℃[cP]: 105~106
 PFR is available.
Rochow Process (ChemCAD)
Rochow Process (ChemCAD)
Rochow Process (ChemCAD)
Methanolysis (ChemCAD)
Methanolysis (ChemCAD)
Methanolysis (ChemCAD)
ROP (Aspen Plus)
ROP (Aspen Plus)
ROP (Aspen Plus)
ROP (Aspen Plus)
Future Work
 Reaction constant search.
 Process model establishment.
Reference
 P. DUBOIS, O. COULEMBIER, and J.-M. RAQUEZ, Handbook of Ring





Opening Polymerization, Wiley-VCH Verlag GmbH & Co. KGaA
Weinheim 2009, pp. 65-76
W. T. GRUBB AND ROBERT C. OSTHOF, JOURNAL OF THE
AMERICAN CHEMICAL SOCIETY 77 (1955) 1405-1411
S. P. GUPTA, M. MOREAU, M. MASURE and P. SIGWALT, Polym. J. 29
(1993) 15-22
E. S. WILKS, Industrial Polymers Handbook, vol.3, Wiley-VCH Verlag
GmbH & Co. KGaA Weinheim
https://www.spectrumchemical.com/OA_HTML/ibeCSrdSrchResults.j
sp?cg=200&kw=T2105&ds=0&dr=25&st=kw&cpg=0&minisite=10020&site=&re
spid=50577
http://en.wikipedia.org/wiki/Viscosity
http://en.wikipedia.org/wiki/Mesh_(scale)

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