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정동진(Chung DongJin),박형진(Park HyongJin),김성래(Kim SungRae),함현식(Hahm HyunSik),박홍수(Park HongSoo),김성길(Kim SeongKil) 한국유화학회 2002 한국응용과학기술학회지 Vol.20 No.1
Environmental friendly acrylics/urea high-solid paints (BEHCU) were prepared through the curing reaction of acrylics resin(BEHC) containing 70wt% of solids content and butylated urea curing agent. BEHC was synthesized by addition copolymerization of caprolactone acrylate(CLA), 2-hydroxypropyl methacrylate(2-HPMA), ethyl methacrylate, and n-butyl acrylate. The addition polymerization of these monomers, especially including flexible CLA monomer and 2-HPMA monomer with OH funtional group, under appropriate reaction conditions resulted in polymers with controlled glass transition temperature(Tg) and crosslinking density. The molecular weight(Mw) of these polymers(BEHCs) was 2940{sim}3240 and polydispersity (Mw/Mn) was in the range of 1.61{sim}1.72. The viscosity and the molecular weight of these acrylic resins increased with increasing Tg. The coated films were prepared using curing reaction between BEHC resin and butylated urea curing agent at 100^{circ}C for 30 minutes. Our experimental resulted showed that enhancement of the coating properties such as adhesion, flexibility, impact resistance, water resistance, and abrasion resistance could be expected through introducing CLA component in acrylic resin for the high-solid content acrylics/urea coatings.
반응형 인계 난연도료의 제조;I.피로포스포릭 변성폴리에스테르의 합성
정동진(Chung DongJin),정충호(Jung ChoongHo),박홍수(Park HongSoo),김태옥(Kim TaeOk),박신자(Park ShinJa) 한국유화학회 2002 한국응용과학기술학회지 Vol.20 No.1
An intermediate, tetramethylene bis (orthophosphate), was prepared by the esterification of pyrophosphoric acid and l,4-butanediol. Then pyrophosphoric-containing modified polyesters (ATTBs) were synthesized by polycondensation of tetramethylene bis(orthophosphate), trimethylolpropane, adipic acid, and l,4-butanediol. The content of l,4-butanediol was varied from 10 to 20wt% for the reaction. The increase of the amount of l,4-butanediol in the synthesis of ATTBs resulted in increase in average molecular weight and decrease in kinematic viscosity owing to the excellent flowability and reactivity of l,4-butanediol.
함현식(Hahm HyunSik),김영국(Kim YoungKook),정동진(Chung DongJin),박홍수(Park HongSoo) 한국유화학회 2002 한국응용과학기술학회지 Vol.20 No.1
In order to prepare a softener, alkyl imidazoline salt, fatty carbamide salt, and fatty polyamide salt were synthesized first, and then the synthesized salts were blended. The prepared softeners were applied to acrylic fibers, and then several properties were tested. As a result, the prepared softeners show good softening and lubricating properties, and they also show a little antistatic property. Through bending resistance tests and measurements of feeling change of acrylic fibers treated with the softeners, it was proved that the prepared softeners are durable softeners.
한국의 산업별 연구개발 성과 비교 -기술무역경쟁력을 중심으로
표경민 ( Gyungmin Pyo ),김진하 ( Jinha Kim ),이영석 ( Young Seok Lee ),정동진 ( Dongjin Chung ) 한국지식재산연구원 2007 지식재산연구 Vol.2 No.2
The national competitive performance of Korea which was announced recently has the tendency of rising. However, the balance of technology trade is rarely improved in opposite to the national competitiveness levels in science and technology sectors. Thus, this paper devises simple indicators for measuring competitiveness of technology trading in Korea. Moreover, we discuss political strategies and the implications for the progress of technology trading power through the existing methods to compare industrial performance in each sector.