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Polyorganosiloxane 변성 Polyurethane Dispersion의 제조와 그 특성
강두환,윤영남 한국공업화학회 2010 공업화학 Vol.21 No.1
양말단에 하이드록시프로필 기를 갖는 폴리올가노실옥산을 합성한 다음 이를 isophorone diisocyanate (IPDI), propylene glycol (PPG) 및 2,2-bis(hydroxymethyl) propionic acid (DMPA)와 함께 공중합하여 폴리올가노실옥산변성 폴리우레탄 중합체(PDMS- PU)를 제조하였다. 이중합체의 양말단에 있는 이소시아네이트기를 butanon oxime으로 blocking시킨 다음 트리에틸아민(TEA)으로 중화시켜 PDMS-PU 수분체를 얻었다. 열분해로 deblocking되는 온도를 측정하였으며 수분산체는 우수한 수분산 안정성을 보였다. 중합 시 NCO/OH의 당량비를 1.12∼1.53으로 하고 DMPA의 함량을 변화시켜 제조한 PDMS-PU 중합체의 수분산체에 대한 분산입자크기를 측정하였으며 반응물에서 DMPA의 함량을 7.2, 13.5, 18.7 mole%로 증가시킴에 따라 입자의 크기는 136, 100, 65 dnm로 감소하는 경향을 나타내었다. DMPA의 함량을 변화시켜 얻은 PDMS- PU 필름의 접촉각 및 접착강도를 측정하였다.
강두환,염규설 한국섬유공학회 1989 한국섬유공학회지 Vol.26 No.6
Photosensitive properties of poly(dimethyl-co-methylphenylsilylene) copolymer(PDMPS) was investigated by the residual film method of measuring the change of solubility of PDMPS before and after exposure to light. The samples coated on quartz plates were exposed to light under various conditions and steeped in the same solvent as used for coating, and then the yield of residual film(W/W0) was measured. The yield of residual film was affected by the molecular weight of PDMPS copolymer, types of photosensitizer, and their concentration. The most effective photosensitizer for PDMPS copolymer among those used here was rosebengal. And also, the photocrosslinking mechanism of PDMPS copolymer was studied by infrared an d UV absorption spectra. The stability of PDMPS spinning fiber by exposing to light was investigated by the change of the solubility of spun fiber after exposing to light was investigated by the change of the solubility of spun fiber after exposing to light.
Polydimethylsiloxane-Polyurethane 공중합체의 합성과 그 특성
강두환,김원기 한국섬유공학회 1989 한국섬유공학회지 Vol.26 No.1
Poly(dimethylsiloxane-b-urethane) was prepared by reacting bis-(aminopropyl)-polydimethylsiloxane oligomer having aminopropyl terminal group with isocyanate terminated polyurethane prepolymers using tin octalate as catalyst at 5$0^{\circ}C$, for 8 hrs. The copolymers formed by urea linkage were identified by IR and NMR spectroscopy, and the molecular weight of the copolymer was determined by GPC. It was revealed that dimethylsiloxane block unit in copolymer is retained its original length during the copolymerization. The mechanical properties such as elongation, tensile strength, and tan$\delta$ of the copolymers containing various contents of dimethylsiloxane segment were investigated. Increasing the composition ratio of dimethylsiloxane block unit in the copolymer, the tensile strength was decreased but the elongation was increased. And also, the morphology to the film of copolymers with various contents of siloxane block unit was examined by scanning electron microscope.
Silicon Carbide 섬유의 제조에 관한 기초연구(I) -Poly(dimethyl-co-methylphenylsilylene) Copolymer의 합성과 열분해-
강두환,심양,양재건,한정련,길충남,Kang, D. W.,Shim, Y.,Yang, J. K.,Han, J. R.,Kihl, C. N. The Korean Fiber Society 1988 한국섬유공학회지 Vol.25 No.2
Soluble poly(dimethyl-co-methylphenylsilylene) (PDMPS) block copolymers with high molecular were prepared by copolymerizing dimethyldichlorosilane with methylphenyldichlorosilane using Na/K alloy and 2-N, N-dimethylaminonaphthalene co-catalyst, and the chemical structure was identified by IR, UV, and NMR. According to the mole ratio of the reactants and the reaction conditions, block units of (Me2Si) and (PhMeSi) in PDMPS copolymer, melting point, molecular weight change, yield, and solubility of PDMPS were measured. The block copolymer was white solid. The activation energies for the depolymerization of polydimethylsilane(PDMS), polymethylphenylsilane(PMPS), and PDMPS were determined by dynamic TGA data. The depolymerization activation energies for PDMS, PMPS, and PDMPS were 52, 71, 58 kcal/g$.$mole, respectively.
Naphthoquinone -1,2- Diazaide - Sulfonyl 기 치환 Polysiloxane 의 합성과 그 감광특성
강두환,정낙진 ( Doo Whan Kang,Nag Jin Chung ) 한국공업화학회 1991 공업화학 Vol.2 No.4
Hexamethylcyclotrisiloxane (D_3), tetramethylcyclotetrasiloxane (TMCTS)을 공중합 시켜 Si-H 결합을 함유한 polysiloxane 공중합체를 합성하고 allylamine과 반응시켜 amino기를 도입시킨 후 naphthoquinone-1,2-diazide-5-sulfonyl chlorde 와 반응시켜 naphthoquinone-1,2-diazide-5-sulfonyl 기가 도입된 polysiloxane 을 합성하였다. 생성 공중합체의 열적특성을 측정한 결과, 열분해온도는 360∼450 ℃ 정도였으며 또한 감광특성은 backbone 수지의 분자량이나 증감제의 종류에 따라 영향을 받았다. Sensitivity는 50∼120 mJ/㎠였고 contrast(γ)는 1.4∼2.1였으며 backbone 수지의 분자량이 증가함에 따라 약간 감소하였다. Polysiloxane copolymers were prepared by copolymerizing hexamethylcyclotrisiloxane with tetramethylcyclotetrasiloxane, and then reacted with allyamine. Copolymers containing naphthoquinone-1,2-diazide-5-sulfonyl group were synthesized by reacting naphthoquinone-1,2-diazide-5-sulfonyl chloride with siloxane copolymers having amino group. Thermal decomposition temperatures of copolymers were 360∼450 ℃, and photosensitive characteristics were dependent on the molecular weights of backbone resins and sensitizers. Sensitivity of copolymers was 50-120 mJ/㎠ and contrast (γ) was 1.4∼2.1.
고기능 고분자 복합재의 고상계면 현상에 대한 연구 (Ⅰ) - 액정 Polyester 와 Poly ( ε- caprolactam ) Alloy 의 제조와 그 특성 -
강두환,강호종,정효성,이용무 ( Doo Whan Kang,Ho Jong Kang,Hyo Sung Jung,Yong Moo Lee ) 한국공업화학회 1997 공업화학 Vol.8 No.1
고탄성, 고강도의 특성을 가지고 있는 열방성 액정고분자인 Vectra(LCP)와 무정형 poly(ε-caprolactam) (PA)의 합금에서 LCP의 함량이 10parts 미만에서는 LCP의 네마틱 상의 유리전이온도가 4∼5℃ 정도 낮은 쪽으로 이동되나 그 이상의 함량에서는 유리전이온도의 이동을 볼 수 없는 것으로 보아 부분적인 상용성만 나타나게 됨을 확인하였다. PA/LCP 합금에서 LCP의 함량을 증가시켜 주기위해 N-glycinylmaleimide(GMI)를 합성한 다음 이를 methylmetacrylate(MMA)와 공중합시켜 poly(glycinylmaleimide-co-methylmetacrylate)[poly(GMI-co-MMA)]공중합체를 합성하고 이를 상용화제로 사용하였으며 이를 사용하는 경우 LCP 30parts 이상을 혼합하여도 혼화성이 있음을 알 수 있었고 이들 합금의 상용성은 합금의 각종 혼합비율에 따른 열적 특성과 rheological 특성을 측정하여 확인 하고 고속충격특성과 굴곡강도 및 탄성율을 측정하였다. LCP/PA alloy was prepared by blending poly(ε-caprolactam)(PA) with liquid crystal polyester, Vectra (LCP) having high elasticity and strength. The alloy prepared amorphous PA with more than 10 parts of thermotropic LCP had poor compatibility. To₄increase the compatibility of the alloy, compatibilizing agent, poly(glycinylmaleimide-co -methylmetacrylate)[poly(GMI-co-MMA)] copolymer was prepared by copolymerizing N-glycinylmaleimide(GMI) with methylmetacrylate(MMA). And then, it was blended with LCP and PA to produce LCP/PA alloy having an excellent compatibility. The compatibility characteristics of the alloy prepared from LCP and PA using the poly(GMI-co-MMA) was determined by measuring the thermal characteristics of glass transition temperature of nematic LCP, and rheological properties, and also high rate impact and flexual characteristics of the alloy were defermined.