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Kationenaustauscher auf Basis von p-carboxystyrolhaltigen Copolymeren
김은영,Kim, Un-Young Korean Chemical Society 1970 대한화학회지 Vol.14 No.1
가교되고 p-요드스티롤을 함유한 공중합체를 부틸리티움 벤젠용액과 반응시키고 이어 이산화탄소와 반응시키면 p-카복시티롤을 갖는 공중합체를 얻을 수 있다. 이 수지로 얻을 수 있는 이온 교환능력은 2.5∼2.8mval/g이다. 그리고 중화곡선으로부터 얻은 $pK_a$치는 보통 수지의 경우 8.07, 톨루엔으로 변성한 수지는 7.75이다. 이 수지는 알칼리성에서 칼리움 이온을 받아들이고, 칼시움 이온과는 $pH^{-6}$에서 85%, 구리 이온과는 pH4-5에서 100% 각각 교환 반응을 일으킨다. Durch Umsetzung von vernetzten p-jodstyrolhaltigen Coplymeren mit benzolischer Butyllithiumlosung und durch anschließende Carboxylierung mit gasformigem Kohlendioxid lassen sich p-carboxystyrolhaltige Copolymere herstellen. Die erreichbare Kapazitat der erhaltenen Harze betragt etwa 2,5 bis 2,8 mval/g. Aus den Titrations-nskurven erhahlt man einen scheinbaren $pK_a$-Wert von 8,07 fur das normal hergestellte und von 7,75 fur das toluolmodifizierte Harz. Der Austauscher nimmt Kaliumoinen im alkalischen Gebiet auf. Das Gleichgewicht des Harzes mit Calciumionen stellt sich bei pH = 6 bei ca. 85% Austausch ein. Dagegen nimmt das Harz Kupferionen bei pH = 4 bis 5 in der Außenlosung bis zu 100% auf.
Synthese von selektiv wirksamen lonenaustauscher auf Polystyrol-Basis
김은영,Kim, Un-Young Korean Chemical Society 1970 대한화학회지 Vol.14 No.1
벤조일 아세톤 혹은 8-Hydroxy-chinolin 구름을 갖는 이온교환수지를 p-리티움스티롤을 함유한 공중합체로부터 합성하였으나 실제로 사용하기는 너무나 적은 이온교환 능력을 갖고 있다. 한편 Tetraphenylarsoniumchlorid 구름을 갖고 있는 교환수지를 상기 공중합체와 Triphenylarsinoxid와 반응시켜 얻었으며 이 수지는 1,3mval/g의 교환 능력을 갖고 있다. 이중 60%정도가 $HgCl_2$ 용액으로부터 수은 이온을 받아들인다. Durch Umsetzung an vernetzten p-lithiumstyrolhaltigen Copolymeren ist es nicht moglich, Austauscherharze mit Benzoylaceton-oder 8-Hydroxy-chinolingruppen mit praktisch brauchbarer Kapazitat herzustellen. Tetraphenylarsoniumchlorid-Gruppierungen enthaltende Austauscher mit einem Gehalt von etwa 1,3 mval/g an funktionellen Gruppen lassen sich aus vernetzten p-lithiumstyrolhaltigen Copolymeren und Triphenyl-arsinoxid herstellen. Aus einer Quecksilber(II)-chlorid-Losung nehmen in wassrigem Dioxan etwa 60% der im Harz befindlichen funktionellen Gruppen Quecksilberionen auf.
김은영(Un-Young Kim) 한국무역연구원 2016 무역연구 Vol.12 No.2
Many countries try to secure agricultural sector for its multifunctional advantage. My objective is to find whether agricultural subsidy is unnecessary as some insist. To do so, I first discuss legal definition of subsidies and the main differences between Agriculture Agreement and Agreement on Subsidies and Countervailing Measures (SCM). Korean agricultural subsidy policy was studied where substantial amount of money were invested. Some countries like the US and EU also in the process of increasing agricultural subsidies in various ways. The case studies show how the US and Korea deal their disputes on agricultural subsidy. Recent development on agricultural subsidy issue were reviewed and it was found that agricultural subsidy for Korea should not be reduced nor neglected since every nations try to increase their agricultural subsidies despite WTO agreement has set limits. DDA (Doha Development Agenda) Negotiation was not concluded last year though it was studied for 15 years. Most recent DDA forum discussed wider reform in agricultural subsidy area, which means Koreahas to prepare New Negotiation where Korea may be treated as a developed nation and be ready to make new agricultural policy. Otherwise, Korea may retard agricultural development while others promote.