Preparation of Large Size Microcapsules Containing Tri-n-octylamine by In situ Polymerization Combined with a Gel Inclusion Method and Their Extraction Behavior

摘要

Large size microcapsules containing tri-n -octylamine (TOA) with a diameter of larger than 2 mm were prepared by in situ polymerization with a gel inclusion of an organic droplet. A copolymer of styrene and divinylbenzene was used as the capsule wall material. When the concentration of TOA was high, the structure of the microcapsules was mono-cored with a thin wall and large cavity. However, at low TOA concentration, the structure changed to a matrix type filled with the copolymer. The TOA content in the microcapsules increased linearly with the initial TOA concentration in the organic phase until 60wt%. The extraction of acetic acid into the microcapsules was successfully carried out. It was possible to reuse the microcapsules 4 times and the extracted amount of acetic acid into the microcapsules was constant during their reuse.