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NR / CR 라텍스 블렌드 필름의 제조 및 물리적 특성
김공수,박주하,엄주송 ( Kong Soo Kim,Jun Ha Park,Ju Song Eum ) 한국공업화학회 1996 공업화학 Vol.7 No.4
천연고무 라텍스(NRL)와 각종 첨가제를 배합 숙성하여 NR 필름을 제조하였고, 클로로프렌고무 라텍스(CRL)를 일정한 비율로 블렌드하여 NR/CR 필름을 제조하였다. 이들 필름의 전가류 시간에 따른 팽윤도와 기계적 성질의 변화를 측정한 결과, 팽윤도 80∼85%, 전가류 시간 48∼60hrs등에서 가장 우수하였고, CRL의 블렌드 비율이 증가함에 따라 인장강도는 감소하고 신장율은 증가하는 경향을 나타내었다. 제조공정을 달리하여 제조한 시편의 기계적특성을 비교한 결과, 1회 디핑법을 사용한 NR/CR 필름의 인장강도, 인열강도는 2회 디핑한 NR-d-CR 필름보다 더 우수하였다. 이들 시편의 표면을 SEM으로 관찰한 결과, CRL의 블렌드 비율이 증가할수록 필름 표면의 벌크한 집합체가 증가되는 것으로 보아 상분리가 일어났음을 관찰할 수 있었다. The NR films were prepared with mixing of natural rubber latex(NRL) with various additives, and NR/CR films were prepared by blend ratio of chloroprene rubber latex(CRL). The swelling degree and the mechanical properties of these films were measured according to the precure time. As a result, optimum condition were showed the swelling degree : 80∼85%, precure time : 48∼60hrs., and tensile strength was reduced but elongation was increased as increasing the blend ratio of CRL. On the mechanical properties of films prepared by different dipping process in these optimum condition, the tensile strength and tear strength of NR/CR films by one dipping process are better than NR-d-CR films by two dipping process. The surface of these films were observed with scanning electron microscopy(SEM). It was found that phase separation was occured as increasing the blend ratio of CRL.
Dipping 법에 의한 천연고무와 그라프트 라텍스 블렌드 필름의 표면특성
김공수,박준하,엄주송 ( Jun Ha Park,Kong Soo Kim,Ju Song Eum ) 한국공업화학회 1994 공업화학 Vol.5 No.6
천연고무 라텍스(NRL)와 메틸메타 크릴레이트가 그라프트된 라텍스(MGL)를 각종 첨가제와 혼합하여 dipping 공정으로 가황된 NR 및 블렌드 필름을 제조하였다. NR 필름 제조의 최적조건을 규명하기 위하여 숙성시간에 따른 팽윤도, 인장강도 및 110℃에서 가황시간의 변화에 따른 기계적 특성을 비교하였다. 필름 표면의 구조 및 미끄럼성을 조사하기 위하여 접촉각 및 정·동마찰계수를 측정한 결과, 접촉각은 MGL의 블렌드 비율이 증가할수록 감소하였고, 정 및 동마찰계수는 NR 필름에 비하여 NR/MG 과 NR-d-MG 필름이 현저히 감소하여 표면 미끄럼성이 향상됨을 알 수 있었다. The vulcanized NR and blend films were prepared with mixing of natural rubber latex (NRL) and methyl methacrylated grafted latex(MGL) with various additives by dipping process. It was investigated the basic properties of vulcanized NR films that is optimum condition of the mature time, swelling degree, cure time at 110℃, and measured the mechanical properties of tensile strength and elongation of its condition. In order to identify the surface structure and the slip properties of blend films, contact angles and static and kinetic friction coefficient were measured. Contact angles were decreased with increment of blend ratio of MGL, and static and kinetic friction coefficient were decreased rapidly for the NR/MG and NR-d-MG films than for the NR films. From the results, NR/MG and NR-d-MG films has slip`s reinforcement in skin contact surface with increased of blend ratio of MGL.
CA 막에 4-비닐피리딘의 그라프트 공중합 및 그의 페놀 투과특성
김공수,이민석,박준하,김영식 ( Kong Soo Kim,Min Suk Lee,Jun Ha Park,Young Sik Kim ) 충북대학교 산업과학기술연구소 1996 산업과학기술연구 논문집 Vol.10 No.1
Abstract_Roman Graft copolymerization of 4-vinylpyridine onto CA membrane was carried out in an aqueous medium by using ceric ammonium nitrate(CAN) as an initiator. The optmium condition for the graft copolymerization were 60'C; pretreatment and grafting
Siloxane - Modified Epoxy Resin 의 특성 : 2 . DGEBA / Siloxane 을 기초로 한 Prepolymer 경화사편의 강인성
박준하,이무재,임정수,김공수 ( Jun Ha Park,Moo Jae Lee,Jeoung Su Lim,Kong Soo Kim ) 한국공업화학회 1997 응용화학 Vol.1 No.1
Siloxane prepolymer were synthesized by epoxy terminated siloxane oligomer onto diamino diphenylmethane(DDM) and bisphenol A(BPA) of melting state. The cured specimen of based siloxane prepolymer were prepared by mixing diglycidyl ether bisphenol A(DGEBA) with 5∼20phr of siloxane prepolymer at reaction temp. 150℃. In DGEBA/polysiloxane system, cured specimen are investigated on mechanical and thermal properties. As a result on mechanical properties, flexural and impact strength were increased that siloxane prepolymer blend ratio increased, on the other hand Tg, thermal expansion coeffi. (α) and modulus were decreased. The morphology of DGEBA/DDM were showed directly cross-section of fraxture energy flow and DGEBA/SiO system were investigated heterogeneously domain forms.
김공수,박준하 한국고무학회 1995 엘라스토머 및 콤포지트 Vol.30 No.5
The vulcanized NR film was prepared with mixing of natural rubber latex(NRL) with various additives by dipping process. It was investigated optimum condition of the mature time, swelling degree, cure time at 110℃, and measured the mechanical properties of tensile stength and elongation. Hydrogel coated NR films were prepared by dipping poly(AA-co-HEMA) solution upper the surface of one dipped NR film of its condition. In order to identify the surface structure and the slip properties of hydrogel coated NR films, contact angles and static·kinetic friction coefficient were measured. Contact angles were increased with increment of poly(AA) mole ratio of poly(AA-co-HEMA), and static·kinetic friction coefficient were increased rapidly for the hydrogel coated NR films than for the NR films. From the results, hydrogel coated NR films has slip's reinforcement in skin contact surface with increased of blend ratio of poly(AA-co-HEMA) solution.
DGEBA/DDM 계 에폭시수지 경화 시험편의 기계적 및 열적특성
김영준,김공수,박준하,김기운 한국고무학회 1998 엘라스토머 및 콤포지트 Vol.33 No.1
In DGEBA/DDM system, the curing specimen are many curing factors which can affect on thermal and mechanical properties. This study was performed to prove the effect on curing specimen prepared by changing of the curing factors which are curing time and temperature of DGEBA/DDM system. As a result on thermal and mechanical properties, flexural strength, modulus and glass transition temperature (Tg) were increased with curing time and temperature were increased. It was found that the optimum curing condition of DGEBA/DDM system cure at 150℃ for 3hrs at equivalent ratio of 1/1.
Siloxane Prepolymer 의 에폭시수지 블렌드 특성
김영준,신재섭,김공수,박준하 한국고무학회 1997 엘라스토머 및 콤포지트 Vol.32 No.3
In solution and melting state, SiOD prepolymer was prepared by cured excess DDM with epoxy-terminated siloxane oligomers to control phase separation when DGEBA was blended with PDMS. DGEBA/SiOD prepolymer was also cured at 150℃ for 3hrs. Mechanical and thermal properties of the cured prepolymer specimen were investigated. DGEBA/SiOD60 specimen blended SiOD prepolymer had the best flexural strength, modulus and impact strength. To show crack-formation procedure to morphology, DGEBA/DDM neat specimen was flowed homogeneously in direction of crack energy, whereas DGEBA/SiOD(30∼60) specimen showed heterogeneously dispersed particles and scattered domain of crack energy, but DGEBA/SiOT specimen showed homogeneous phase.