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.

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.

Siloxane Modified Epoxy 수지의 제조와 경화 특성

강두환,이용준,강동필(Doo Whan Kang),Yong Joon Lee,Dong Pil Kang 한국고분자학회 1993 폴리머 Vol.17 No.5

Polydimethylsiloxane-Polyurethand Interpenetrating Polymer Networks의 제조와 산소투과 특성에 관한 연구

강두환,김원기,황재욱,심양,Kang, Doo-Whan,Kim, Won-Ki,Whang, Jai-Wook,Shim, Yang 한국섬유공학회 1987 한국섬유공학회지 Vol.24 No.5

Interpenetrating polymer networks(IPN) based on polyurethane and polydimethylsiloxane have been prepared by simultaneous polymerization method, and the permeability of N2 and O2 and pemselectivity of oxygen to nitrogen were evaluated. The polyurethane networks were prepared by reacting NCO group terminated polyurethane prepolymer composed of 2 eq.of TDI and 1 eq.of polyol with the mixture of 1,4-butadiene and trimethylor propane as the crosslinking agent. Polydimethylsiloxane networks were prepared by polymerizing the mixture of octamethylcyclotetrasiloxane, tetraammonium hydroxide and tetraethoxysilane. The prepared IPN was confirmed by the measurement of Young's modulus and tanδ using dynamic mechanical analyzer spectrometer, The permeabilities of oxygen and nitrogen were better in the membrane increasing the contents of polydimethylsiloxane than having lower contents of polydimethylsiloxane in the composition. But the IPN with lower contents of polydimethylsiloxane has the higher selectivity.

Poly ( methylpheny ) Silane Photoresist 의 특성

강두환,정낙진 ( Doo Whan Kang,Nak Jin Chung ) 한국공업화학회 1990 공업화학 Vol.1 No.2

Polymethylphenylsilane(PMPS) was synthesized with methylphenyldichlorosilane using metal sodium. Various sample coated on quartz plate were exposed and the yield of residual film was calculated. To obtain the fine image forming after developing and drying, optical transmittance characterization have to be considerd. Exposure is described by three optical paramerters X, Y, and Z. There parameters are normally determined from optical transmittance measurements of exposed PMPS films. Z parameter was determined from the initial slope of a transmittance according to exposure time. This set of function parameters provided a complete description of photoresist exposure and development and became the basis for the theoretical process models.

Poly(dimethylsiloxane-co-N-phenylsilaxazane) 변성 Acrylate Resin의 제조와 그 특성

강두환(Doo Whan Kang),금민우(Min Woo Kum),윤재선(Jae Seon Yoon) 한국고분자학회 2010 폴리머 Vol.34 No.2

Silicone 변성 말레화 PE/HDPE/CNT Composite의 제조와 PTC 특성

강두환 ( Doo Whan Kang ),박승우 ( Seung Woo Park ) 한국공업화학회 2011 공업화학 Vol.22 No.1

a,w-Hydroxypropylpoly(dimethylsiloxane)은 a,w-hydrogenpolydimethylsiloxane을 allyl alcohol과 반응시켜 제조하였으며 이를 말레화 PE에 그라프트 시켜 MPE-g-PDMS 공중합체(MPES)를 제조하였다. MPES와 HDPE 및 4-ethoxybenzoic acid로 표면처리 된 MWCNT를 internal mixer에 가하고 180℃에서 compounding하여 MPES/HDPE/EtO-CNT 복합체를 제조하였다. 열적특성을 측정한 결과 표면처리 된 CNT의 함량을 10에서 20wt%로 증가시켜 제조한 MPES/CNT 복합체의 Tm은 132에서 131℃로 약간 감소되었고 MPES/EtO-CNT 복합체의 경우 EtO-CNT의 함량을 10에서 20wt%로 증가시킴에 따라 130에서 129℃으로 약간 감소되었다. 또한 EtO-CNT를 사용하여 제조한 복합체의 경우 120℃에서 전기저항이 급격하게 증가되어 PTC 현상이 나타났으며 또한 EtO-CNT의 함량을 10wt%로 하여 제조한 복합체의 PTC intensity가 1.9로 가장 높게 나타났다. a,w-Hydroxypropylpoly(dimethylsiloxane) was prepared from the reaction of a a,w-hydrogen polydimethylsiloxane with an allyl alcohol. MPE-g-poly(dimethylsiloxane) copolymer (MPES) was prepared from the graft copolymerization of MPE with a,w-hydroxypropyl group terminated PDMS. MPES/HDPE/EtO-CNT need to varify was prepared from the compounding of MPES, HDPE, and surface treated MWCNT with 4-ethoxybenzoic acid at 180℃. Melting point of the MPES/HDPE/EtO-CNT composite was decreased from 130 to 129℃ as increasing the content of MWCNT 10 to 20wt% in the composite PTC characteristic of the MPES/HDPE/EtO-CNT composite was appeared at 120℃ as abruptly increasing the electrical resistivity at this temperature. The heighest PTC intensity of MPES/HDPE/EtO-CNT compsite at 10wt% loading of EtO-CNT was 1.9.

Nickel Ferrite 함유 Poly(organosiloxane) Rubber Nanocomposite의 제조와 특성

강두환(Doo Whan Kang),이권수(Kweon Soo Lee) 한국고분자학회 2005 폴리머 Vol.29 No.2

Polyarylsiloxane Modified Rosinimides 의 합성과 그 특성

강두환(Doo Whan Kang),김영민(Young Min Kim),권동건(Dong Keon Kweon) 한국고분자학회 1998 폴리머 Vol.22 No.4

Polyorganosiloxane 변성 말레화 EPDM/EPDM 방진고무의 제조와 그 특성

강두환 ( Doo Whan Kang ),김소미 ( So Mi Kim ) 한국공업화학회 2010 공업화학 Vol.21 No.5

산업폐기물 중의 하나인 무기 금속화합물, Alnico를 1,3,5-trimethylcyclotrisilazane으로 표면 처리하여 충전제로 하고 EPDM에 maleic anhydride (MA)를 용융 중합법으로 그라프트시켜 제조한 말레화 EPDM과 α,ω-bis(3-aminopropyl)polydimethylsiloxane을 공중합시켜 제조한 말레화 EPDM-polydimethylsiloxane공중합체(MEPDM-PDMS)와 EPDM 및 표면처리된 Alnico를 compounding하여 composite rubber를 제조하였다. EPDM/Alnico/MEPDM-PDMS 방진고무는 MEPDM-PDMS와 EPDM을 중량비로 1:10으로 하고 또한 충전제의 함량을 EPDM에 대하여 25, 50 phrs로 그리고 개시제로 dicumyl peroxide (DCP)를 첨가하여 compounding시킨 다음 유압 고온 프레스로 가교시켜 제조하였다. 제조한 composite rubber의 열적특성을 측정한 결과 MEPDM-PDMS를 첨가하여 제조한 시료의 Tg가 EPDM만으로 제조한 고무보다 약간 낮은 -33 ℃ 부근으로 나타났고 DMA의 측정결과 손실계수 tan δ는 MEPDM-PDMS을 혼합한 경우가 더 크게 나타나는 것으로 보아 방진 특성이 우수함을 확인하였다. The surface of Alnico, one of the industrial dust waste, was treated with 1,3,5-trivinyl-1,3,5-trimethylcyclotrisilazane (VMS) as a surface treating agent and used as the filler for vibration isolator rubber. Maleated EPDM prepared from bulk polymerization of EPDM with maleic anhydride was copolymerized with α,ω-bis(3-aminopropyl)polydimethylsiloxane to obtain maleated EPDM-polydimethylsiloxane copolymer (MEPDM-PDMS). EPDM/Alnico/MEPDM-PDMS vibration isolator rubber was prepared from compounding with Alnico treated with surface treating agent, 25 and 50 phrs to EPDM, respectvely based on 1 to 10 wt% of MEPDM-PDMS to EPDM. From the measurement of the thermal properties to the rubber, the glass transition temperatures (Tg) for the rubber containing maleated EPDM-PDMS copolymer was slightly lower temperature, 33 ℃ than EPDM rubber, and also DMA results showed higher tan δ peak to the rubber prepared from compounding with EPDM-PDMS copolymer. From the results, rubber prepared using EPDM-PDMS copolymer had better vibration isolator property.