Cyanopropyl Polysilphenylene Siloxane

BPX70, BPX90 High cyanopropyl substituted phases, are more difficult to make as efficient, thermally stable phases. BPX70 is equivalent to and behaves like a 70% cyanopropyl siloxane but with siphenyl end substituted backbone for stability which was introduced in 1987 and remained the most polar thermally stable phase for a long time. BPX90 which is equivalent to a 90% cyanopropyl siloxane and stable to 300 °C which is excellent for such a polar phase. The prominent interaction for BPX90 is π – π bonding with the cyano group; the cyano groups become almost entirely responsible for the partitioning.

BPX70, BPX90

High cyanopropyl substituted phases, are more difficult to make as efficient, thermally stable phases.

BPX70 is equivalent to and behaves like a 70% cyanopropyl siloxane but with siphenyl end substituted backbone for stability which was introduced in 1987 and remained the most polar thermally stable phase for a long time.

BPX90 which is equivalent to a 90% cyanopropyl siloxane and stable to 300 °C which is excellent for such a polar phase. The prominent interaction for BPX90 is π – π bonding with the cyano group; the cyano groups become almost entirely responsible for the partitioning.