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Copolymers made of polycarbonate (PC) and polydimethylsiloxane (PDMS) are broadly applied in material science. High impact-stability and transparency are the marks of bisphenol-A polycarbonate. PDMS on the other hand excels in thermal stability, flame resistance and weatherability. Combining those favourable characteristics in a copolymer yields in a ductile but impact-resistant and flame retardant material. In order to understand the synthesis process and to improve the quality and characteristics of a copolymer, knowing its structure is essential. The challenge lies in the variety of heterogeneities like molecular mass-, block-size- and block-distribution.
This study addresses the structural characterization of PC-PDMS-copolymers using different liquid chromatographic techniques, including two dimensional combinations, hyphenated to MALDI-mass spectrometry and FTIR. The large difference in polarities of PC and PDMS is a challenge for liquid chromatography as well as ionization in MALDI. Nevertheless, we were able to differentiate between homopolymer and actual copolymer, clarify the presence of cyclic structures and gain information about the PDMS blocks