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폴리에틸렌 필름에의 광개시 그라프트 공중합(III) -고밀도 폴리에틸렌;겔 퍼센트, 열적성질, 역학적성질 및 표면구조의 변화-
김상율,송석규 한국섬유공학회 1987 한국섬유공학회지 Vol.24 No.6
Graft copolymers of high density polyethylene(HDPE) and acrylic acid(AA) were prepared by the photoinduced grafting technique. The properties of HDPE-g-AA copolymer films of different graft yield were evaluated. Measurement included gel percent, thermal property, mechanical property, and change of morphology. The insoluble part of the grafted film after extraction with p-xylene and methanol was increased as increasing the graft yield. Results of thermal property indicate that the grafting occurred in the amorphous region without disrupting the crystalline part of HDPE film. As the graft yield was increased, the initial modulus and tensile strength at yield point were increased but the elongation was decreased.
김상율,송석규 한국섬유공학회 1987 한국섬유공학회지 Vol.24 No.3
The photoirradiation graft copolymerization of acrylic acid (AA) onto low density polyethylene (LDPE) film using benzophenone (BP) as a photosensitizer in an aqueous medium was investigated. The effect of monomer concentration, photosensitizer concentration, and reaction time on the graft yield were evaluated. The moisture regain and the degree of swelling of grafted film were higher than those of original film. As the graft yield was increased, the initial modulus and the tensile strength at yield point were increased but the elongation at break point, the crystallinity, and the heat of fusion were decreased. The elongation at yield point and the melting point were sustained without great difference.
폴리에틸렌 필름에의 광개시 그라프트 공중합(II) -고밀도 폴리에틸렌;반응조건의 영향 및 접촉각, 팽윤도의 변화-
김상율,송석규 한국섬유공학회 1987 한국섬유공학회지 Vol.24 No.4
Graft copolymerization with acrylic acid(AA) onto high density polyethylene(HDPE)film by using benzophenone(BP) as a photosensitizer in an aqueous medium was carried out under ultraviolet(UV) irradiation. The infrared spectrum of the grafted HDPE film with acrylic acid shows characteristic bands of carboxylic acid, which demonstrates that grafting occured. The effects of various reaction parameters involving monomer concentration, photosensitizer concentration, reaction time and reaction temperature were investigated. As monomer concentration and photosensitizer concentration were increased, the graft yield was increased up to limiting value and after decreased. And also the graft yield was found to increase by increasing the reaction time and temperature. It was shown that the contact angle was decreased and the degree of swelling was increased with increasing the graft yield.
폴리에틸렌 필름에의 광개시 그라프트 공중합(IV) -고밀도 폴리에틸렌 막의 역삼투 특성-
김상율,송석규 한국섬유공학회 1988 한국섬유공학회지 Vol.25 No.3
Semipermeable high density polyethylene(HDPE) membranes were prepared by photoinduced grafting of acrylic acid(AA) onto HDPE films. The reverse osmosis characteristics of HDPE-g-AA membranes of different graft yields were evaluated. These properties were found to very with the composition of the graft copolymer membrane; most properties were found to be a linear function of the graft yield. As the graft yield was increased, the water flux and the water content were increased but the salt rejection was decreased, and these were related to the effect of feed solution concentration.