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Synthesis, Design and Polymerization of 5-membered exo methylene Cyclic Acetals
박재경(Jae-kyeung Park) 한국산업융합학회 2003 한국산업융합학회 논문집 Vol.6 No.1
5원환 고리아세탈 화합물인 4-methylenes(4,5)을 합성하고 저온조건 하에서 중합반응을 조사한 결과, 선택적인 개환중합이 일어났다. 보통의 양이온 개시제를 사용한 결과 -78℃에서 가교체가 얻어졌으며, CH₃SO₃H를 개시제로 사용하면 같은 조건에서도 주사슬과 곁사슬에 이중결합을 가지는 개환중합체가 얻어진다. 이 중합체는 반응성을 가지는 불포화기를 포함하고 있으므로 prepolymer로써 널리 사용될 수 있다.
박재경 ( Jae-kyeung Park ),조성식 ( Sung-shik Cho ) 한국산업융합학회 2007 한국산업융합학회 논문집 Vol.10 No.3
The sugar content of persimmon fruits was decreased when food-waste compost was used. Dungsi was brighter with yellow color than that of control. The Gabjubaekmok was darker than that of control with red color. It was suggested that taste of astringent was reduced because total phenol and soluble tannin contents were reduced by that compost. The vitamin C content of persimmon fruits during storage was higher than that of control. Stability of persimmon fruits by that compost and usual compost was about the same at room temperature. At low temperature, hardness of persimmon fruits was maintained for 20days. Hardness and reducing sugar contents of persimmon fruits were increased by food-waste compost. The result was shown that there was no effect on composition of persimmon fruits by food-waste compost and maintaining hardness at room temperature, but at low temperature, the composition of persimmon fruits was changed.
박재경(Jae-kyeung Park) 한국산업융합학회 2001 한국산업융합학회 논문집 Vol.4 No.3
기능성고분자재료 중의 하나인 7원환 고리아세탈 화합물인 1,3-dioxepan-2-one(1)을 합성하고 고온조건 하에서 중합반응을 조사한 결과 선택적인 개환중합이 일어났다. 그러나 낮은 농도에서 작은 분자량을 가지는 고분자가 얻어졌으며 넓은 분자량 분포와 낮은 수율이 얻어지며 이것은 중압반응 도중에 분자 내에서 상호반응을 일으킴을 보여준다.
PCL-MMT 나노복합재료의 기계적 성질과 생분해에 관한 연구
최현국 ( Hyun-kuk Choi ),이영세 ( Young-sei Lee ),박재경 ( Jae-kyeung Park ) 한국산업융합학회 2005 한국산업융합학회 논문집 Vol.8 No.1
PCL were intercalated into organically modified MMT(PCL-MMT) at 80°C for 4hrs to prepare the PCL-MMT nanocomposite. PCL-MMT and PCL were mixed mechanically with two-roll mill at 150 ℃ for 15mins. From the results of XRD and TEM, it were found that PCL-MMT nanocomposite were prepared. And mechanical properties and biodegradation of nanocomposite have been investigated by tensile meter and biodegradability analysis experiment. Because of MMT dispersed homogeneously in PCL matrix, the Young's modulus of the nanocomposite was found to be excellent. But the tensile strength and elongation were decreased as increase of MMT. And MMT dispersed in PCL matrix was almost not affected on the biodegradation of PCL.