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Effect of OH-Group Introduction on Gas and Liquid Separation Properties of Polydecylmethylsiloxane.

Evgenia A GrushevenkoTatiana N RokhmankaIlya L BorisovAlexey V VolkovStepan D Bazhenov
Published in: Polymers (2023)
Membrane development for specific separation tasks is a current and important topic. In this work, the influence of OH-groups introduced in polydecylmethylsiloxane (PDecMS) was shown on the separation of CO 2 from air and aldehydes from hydroformylation reaction media. OH-groups were introduced to PDecMS during hydrosilylation reaction by adding 1-decene with undecenol-1 to polymethylhydrosiloxane, and further cross-linking. Flat sheet composite membranes were developed based on these polymers. For obtained membranes, transport and separation properties were studied for individual gases (CO 2 , N 2 , O 2 ) and liquids (1-hexene, 1-heptene, 1-octene, 1-nonene, heptanal and decanal). Sorption measurements were carried out for an explanation of difference in transport properties. The general trend was a decrease in membrane permeability with the introduction of OH groups. The presence of OH groups in the siloxane led to a significant increase in the selectivity of permeability with respect to acidic components. For example, on comparing PDecMS and OH-PDecMS (~7% OH-groups to decyl), it was shown that selectivity heptanal/1-hexene increased eight times.
Keyphrases
  • liquid chromatography
  • endothelial cells
  • ionic liquid
  • working memory
  • room temperature
  • heavy metals
  • carbon dioxide