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Online monitoring of Silicone Network Formation by Means of In‐Situ Mid‐Infrared Spectroscopy
Author(s) -
Scherble Jonas,
Iván Béla,
Mülhaupt Rolf
Publication year - 2002
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(200208)203:12<1866::aid-macp1866>3.0.co;2-g
Subject(s) - methacrylate , monomer , polymer chemistry , copolymer , polymerization , silicone , infrared spectroscopy , methyl methacrylate , chemistry , materials science , polymer , organic chemistry
The ReactIR™ reaction analysis system was used to monitor the crosslinking copolymerization of trimethylsilyl methacrylate with α , ω ‐methacryloyl‐terminated oligo(dimethylsiloxane). Characteristic infrared bands proved useful to determine the total methacrylate concentration. After less than 12 h at 60 °C using 0.14% 2,2′‐azoisobutyronitrile (AIBN), the methacrylate conversion during the crosslinking reaction exceeded 98%. The comparison of the crosslinking reaction with a methacrylate homopolymerization showed that significant autoacceleration occurred during network formation.Time‐dependent monomer conversion [M]/[M] 0 for TMSMA homopolymerization (run H in Table 1) and the corresponding crosslinking polymerization (run N) as revealed by the peak at 1 326 cm −1 .