On the degradation and stabilization of poly(methyl methacrylate) in a continuous process

Thermally unstable polymers such as poly(Me methacrylate) are degraded considerably during industrial processing. This degrdn. and its redn. to a min. were investigated in both lab and continuous pilot-scale expts. A three-step degrdn. mechanism, starting at 180 Deg, was proved by Thermogravimetrical Anal. (TGA) and a kinetic approach to describe it was derived. The knowledge of this degrdn. behavior was then applied to a pilot-scale process with a prodn. rate of 10 kg/h and the process yield loss during the devolatilization step was investigated. Using heat stabilizers, the overall process yield could be improved by 10 %, whereas the residual org. volatiles concn. (VOC) was drastically reduced to values below 1000 ppm. In order to preserve the mol. wt. of the final product these stabilizers were added into the process, sep., at the end of the polymn. reaction but before the devolatilization step.


Published in:
Chemical Engineering & Technology, 26, 5, 599-604
Year:
2003
Keywords:
Note:
CAN 139:324079
37-3
Plastics Manufacture and Processing
Swiss Federal Institute of Technology, Institute of Chemical and Biological Process Science, Polymer Reaction Engineering Unit,SB-ISP-UPRE,Lausanne,Switz.
Journal
0930-7516
written in English.
593282-99-6 (Irganox XP 30) Role: MOA (Modifier or additive use), USES (Uses) (Irgafos XP 30, stabilizer; degrdn. and stabilization of poly(Me methacrylate) during continuous polymn.); 9011-14-7 (Poly(methyl methacrylate) Role: PEP (Physical, engineering or chemical process), POF (Polymer in formulation), PRP (Properties), PYP (Physical process), TEM (Technical or engineered material use), PROC (Process), USES (Uses) (degrdn. and stabilization of poly(Me methacrylate) during continuous polymn.); 112-55-0 (1-Dodecanethiol); 31570-04-4 (Irgafos 168); 80693-00-1 (ADK STAB PEP 36); 140221-14-3 (ADK STAB HP 10); 145650-60-8 (Irgafos 38) Role: MOA (Modifier or additive use), USES (Uses) (stabilizer; degrdn. and stabilization of poly(Me methacrylate) during continuous polymn.)
Other identifiers:
Laboratories:




 Record created 2009-02-09, last modified 2018-09-13


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