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PVA / Chitosan 블랜드필름의 효소와 pH 변화에 따른 분해효과
조형재,김종완,황성규,이기창,정덕채 ( Hyung Jae Cho,Jong Woan Kim,Sung Kwy Hwang,Ki Chang Lee,Duck Chae Jung ) 한국유화학회 1998 한국응용과학기술학회지 Vol.15 No.3
Polyvinyl alchol[PVA] is useful for the production of water-soluble packaging, paper, textile sizes. PVA and Chitosan are known as biodegradable polymers. PVA/chitosan blend films were prepared by solution blends method in the weight ratio of chitosan for the purpose of useful biodegradable films. Thermal and mechanical properties of PVA/chitosan blend films such as DSC, impact strength, tensile strength and morphology by SEM were determined. As a result. The ratio of 10.0wt% PVA/chitosan blend films were similar to PVA. Blend films were completely degraded pH 4.0 better than 7.0, 10.0 in the buffer solution. Also, Blend films were rapidly degraded enzyme(β-glucosidase) solution better than pH solution by Enzymolysis.
PVA 와 Algin 의 블렌딩에 따른 특성과 토양분해
조형재(Hyung Jae Cho),오세영(Se Young Oh),이기창(Ki Chang Lee),정덕채(Duck Chea Jung),김용렬(Yong Yeul Kim),황성희(Seong Hee Hwang) 한국유화학회 1999 한국응용과학기술학회지 Vol.16 No.1
N/A Algin is known as biodegradable natural polymer from marine plants. PVA/Algin blend films were prepared by solution blending method for the purpose of useful biodegradable polymer. Characteristics properties of PVA/Algin blend films such as DSC, Elongation, Tensile strength and Morphological change by SEM were ratio of Algin. PVA/Algin blend films were found that phase separation was occured as more than 25wt% increasing the blend ratio of Algin. Blend films were observed to be less partially compatibility than 10wt% increasing the blend ratio of Algin by DSC, mechanical properties and SEM. Also, PVA/Algin blend films at the laboratory soil test(Pot Test) were completely degraded in months with four kinds of soils by microorganisms.
오존층 파괴 물질인 TCE, CFC의 탄화수소계 대체세정제를 이용한 스크린인쇄 세정
이기창,정덕채,김종완,조형재 明知大學校 産業技術硏究所 1999 産業技術硏究所論文集 Vol.18 No.-
Alternatives cleanser to 1,1,1-TCE & CFC-113 used as cleanser for industrial parts are developed because the cleanser is scheduled to phaseout after 1996. Also, Existing cleaner using screen printing are the organic solvents including aromatic compounds carried with poisonous and stench. Besides, cleaning method of current screen printing are for the most part mixed cleaning method of dipping and polish using duster. Accordingly, It had a bad effect to the working environment and the worker body. Therefore, Using alternative hydrocarbon cleanser to 1,1,1-TCE & CFC-113 used as cleanser for industrial parts be substituted for existing cleanser against screen printing ink measured the cleaning efficiency according to gravimetric analysis method and property change of gossamer according to Image Analyzer. Also, Cleaning process system carry with excellent cleaning efficiency studied which was proposed new cleaning process including ultrasonic and vibration cleaning process be substituted for existing.