초록문의 abstract@kcsnet.or.kr

결제문의 member@kcsnet.or.kr

현재 가능한 작업은 아래와 같습니다.
  • 09월 05일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제120회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Controlled Synthesis of Sodium Polystyrenesulfonate via Atom Transfer Radical Polymerization and Coupling of Polystyrene Beads Selectively at the Terminal Units

2017년 8월 23일 10시 13분 38초
POLY.P-10 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 20일 (금요일) 13:00~14:30
Polymer Chemistry
저자 및
Ranjit De, Hohjai Lee1,*
Department of Chemistry, Gwangju Institute of Science and Technology, Korea
1Chemistry, Gwangju Institute of Science and Technology, Korea
Synthesis of anionic polyelectrolyte sodium polystyrenesulfonate (NaPSS) with predetermined molecular weight, low polydispersity index (PDI), and controlled kinetics has been carried out. The monomer styrene with a sulfonate group at its para-position has been homopolymerized in water/methanol (1:1, volumetric) mixed solvent media, which controlled the rate of polymerization. Initially, the molecular weight of the polyelectrolyte was determined by 1H-NMR spectroscopy. To reconfirm, it was also determined using Gel Permeation Chromatography (GPC) technique and the PDI was evaluated to be about 1.2. Characterization of the polymer was carried out using 1H-NMR, 13C-NMR, and FT-IR. One of the two terminal groups contained –COOH group introduced into the chain through the initiator while the other end was having the –Br group which came via atom transfer from the copper catalyst complex. A polystyrene bead (diameter 2 µm) with –NH2 groups on its surface was linked to the terminal unit containing –COOH group through amide bond formation. Thereafter, the –Br group at the other terminal unit was converted to –COOH group which was then coupled to another polystyrene bead bearing –NH2 group. This strategy of successive addition of polystyrene beads to the polyelectrolyte chain helped us to negate the possibility of linking of both the ends of a chain into the same bead resulting controlled coupling of two beads per polymer chain. These beads-linked polyelectrolyte chains will be used to study their coiling/uncoiling behavior via single molecule spectroscopic technique, such as, optical tweezer.