| 초록 |
Octamethylcyclotetrasiloxane(OMCTS) was polymerized in the presence of styrene-co-acrylonitrile(SAN) by ultrasonic irradiation-initiated polymerization. It was previously found that ring opening polymerization of OMCTS is possible by sonochemical means which results in formation of polydimethylsiloxae(PDMS) with elastic property and thermal stability. Thus, when OMCTS was polymerized with SAN, it was expected that polymerized OMCTS may play a important role in SAN phase as a stabilizing agent in terms of both thermal properties and flame retardance. To verify the effectiveness of PDMS for such enhancements, the thermal degradation of PDMS modified SAN was investigated by thermogravimetry(TGA), and compared with that of neat SAN. Formation of the PDMS-SAN copolymer was confirmed by FTIR analysis after the extraction of ungrafted ingredients from the mixture. Also the effect of PDMS on the dynamic mechanical properties and rheological behavior of SAN are discussed. |
