폴리부틸렌 나프탈레이트를 하드 세그먼트로 하는 폴리(에테르-에스터) 공중합체의 합성

윤기종,서영삼,Yoon, Kee Jong,Seo, Young Sam 한국섬유공학회 2013 한국섬유공학회지 Vol.50 No.1

Melting temperature of the poly(ether-ester) copolymers are generally around $200^{\circ}C$ and are suitable for moisture barrier in active sportswear, but higher melting temperatures are required for them to be used in personal protective clothing. In an attempt to obtain higher melting poly(ether-ester) copolymers, copolymerization of bishydroxybutyl naphthalate and poly(ethylene glycol)-b-poly(propylene glycol)-b-poly(ethylene glycol) tri-block copolymers (EPE) was carried out to obtain poly(butylene 2,6-naphthalate)/EPE copolymers with poly(butylene 2,6-naphthalate) (PBN) as hard segments and EPE as soft segments. PBN/EPE copolymers containing different amounts of EPE (0, 5, 10, 20 and 30 wt%) of different molecular weights (1100, 2000, 2800 and 5800) were prepared. Composition analysis, solution viscosity and density measurements were made. The composition of copolymers determined from $^1H$-NMR spectra were similar to feed composition.

아크릴로 니트릴로 그라프트된 전분의 가수분해에 의한 고흡수제

윤기종 한국섬유공학회 1991 한국섬유공학회지 Vol.28 No.3

소방관의 열 압박에 대한 수분의 영향

윤기종 한국섬유공학회 2019 한국섬유공학회지 Vol.56 No.1

The greatest cause of fatality of fire fighters is heat stress rather than suffocation or burns. Heat stress increases the probability of heart attacks to a great extent and this was found to be the major cause of fatality of fire fighters. The effect of humidity on heat stress has been studied and is widely documented, however it appears that not enough attention is practiced in fire fighting. As fire fighter turnout gear often get wet when they are fighting fire, this paper attempts emphasize the importance of trying to keep the turnout gear as dry as possible to reduce the damaging effect of moisture on the heat stress that fire fighters experience. When fire fighters enter burning buildings other fire fighters spray water from a distance at the point of entry to reduce the intensity of fire there. The effect of added moisture on the temperature and relative humidity between the internal layers of the turnout gear is studied to infer the effect on heat stress. Preliminary experiments exposing a multilayer assembly whose outer layer is either conditioned or wetted on a radiant heat transfer equipment and measuring the change in temperature and humidity at two locations between the layers suggest that the transport of moisture carrying the external heat inward has a significant effect on the heat stress a fire fighter might experience. The data is analyzed with a typical heat stress index table as a first approximation of the heat stress the fire fighter might experience. The results suggests that the presence of moisture has extensive effect on the heat stress and that they should try to keep their turnout gear as dry as possible.

술과 건강보험 : 술 권하는 사회와 법의 냉소(冷笑) 3

윤기종 대한보건협회 2005 건강생활 Vol.2005 No.-

Poly(MAn-co-VAc)를 이용한 면섬유의 반응성 염색에 대한 방염효과

윤기종,김규오,서영삼,Yoon, Kee-Jong,Kim, Kyu-Oh,Seo, Young-Sam 한국섬유공학회 2009 한국섬유공학회지 Vol.46 No.3

Poly(maleic anhydride-co-vinyl acetate) copolymers were prepared by copolymerization in toluene, using AIBN as initiator. Cotton knit fabric was treated with poly(MAn-co-VAc) and the changes in the dye resist property with molecular weight, concentration and curing time was studied. The dye resist ability was evaluated by colorimetric analysis. Higher molecular weight copolymers were more efficient in blocking the dye. This appears to be due to the preferential reaction of the copolymer on the surface of cotton fabric, where the longer chains are more efficient in blocking the penetration of the dye into the fiber, due to the hydrophobic nature of the vinyl acetate comonomer. The blocking effect increased with concentration of the blocking agent padding bath, but yellowing occurred at concentrations above 30 wt%. Although dye resist effect was best when curing time of poly(MAn-co-VAc) was 2 min 30 see, the cotton fabric turned yellowish. Therefore, curing time should be less than 2 min 15 sec in order to avoid yellowing effect and obtain good dye resist property.

폴리우레탄 필름의 인장에 따른 염착거동

윤기종,조보영 檀國大學校 出版部 1999 論文集 Vol.34 No.3

전분계 고흡수제의 가수분해 방법에 관한 연구 -중합물의 직접 가수분해-

윤기종,안정숙,박종신,송경근,고석원 한국섬유공학회 2000 한국섬유공학회지 Vol.37 No.3

Starch based superabsorbents are generally prepared by a 2-step process: The first step is the graft copolymerization of acrylonitrile (AN) onto starch, washing and drying of the graft copolymer, and the second step is the hydrolysis of the starch-g-polyacrylonitrile (SPAN) powder in aqueous NaOH solution. During hydrolysis, the graft copolymer becomes a thick gummy mass which can not be stirred to ensure uniform reactionand it also becomes very difficult to isolate the superabsorbent. To simplify the process and to avoid the formation of the thick gummy mass, hydrolysis was carried out by addition of NaOH to the graft copolymerization mixture directly without washing and drying. This method allows more uniform reaction since stirring is possible and easier isolation of the superabsorbents. The starch based superabsorbents containing up to 25% PAN prepared by direct hydrolysis have similar absorbency, water retention, and absorption rates compared with those prepared by the general hydrolysis method.

Spacer 사용에 따른 방화복의 multi layer thermal barrier의 열적 성질 및 쾌적성에 미치는 영향

윤기종,홍경아,Yoon, Kee-Jong,Hong, Kyoung-A 한국섬유공학회 2010 한국섬유공학회지 Vol.47 No.6

For firefighter protective clothing, the thermal protective performance is of primary importance but its comfort should also be considered. In this aspect, the effects of the thermal barrier construction on the level of thermal protection were investigated. Various thermal barriers were prepared to maximize the thermal protection and comfort properties. Multilayer thermal barriers prepared from meta-aramid needle punched nonwovens of different thickness and number of layers with and without spacers were compared. The differences in their thermal insulation and comfort properties were evaluated using flame testing, bending length measurements and water vapor permeability. For thermal barriers, multi-layer construction with spacers exhibited higher thermal protective performance and lower bending rigidity.

폴리(n-메틸렌테레프탈레이트) 또는 폴리에틸렌나프탈레이트/폴리카프로락톤 용융 블렌드들의 에스테르 교환반응 거동

윤기종,임경율 한국섬유공학회 2000 한국섬유공학회지 Vol.37 No.9

To investigate the effects of chain structures, such as the number of methylene groups and different aromatic units in polyesters, on the ester interchange reaction during melt blending, PCL was blended with PET, PTT, PBT of PEN. The ester interchange reaction of blends was characterized by $^{1}H$-NMR and the thermal property, crystal structure and morphology of blends were studied by DSC, X-ray and SEM analyses. The ester interchange reactions could be confirmed in PET/PCL and PTT/PCL blends, but did not occur significantly in PBT/PCL and PEN/PCL blends. At the higher degree of ester interchange reaction, melting temperature of blends decreased and the morphology of blends changed to a homogeneous phase. It appears that ester interchange reaction during melt blending is affected by the chain structure of polyester as well as the concentration of terminal alcohol, carboxyl and ester groups.

에틸렌 테러프탈레이트 단위와 카프로락톤 단위로 구성된 폴리(에스테르/에스테르) 랜덤 공중합체의 결정 구조 및 결정화 거동

윤기종,임경율,김갑진 한국섬유공학회 2000 한국섬유공학회지 Vol.37 No.10

The crystal structure and isothermal crystallization behavior of random copolyesters based on ethylene terephthalate(ET) and caprolactone(CL) units were investigated by melting point depression, X-ray diffraction and polarizing microscope equipped with a hot stage. The melting point depression begavior of P(ET/CL) random copolyesters with increasing contents of CL units was closest to that predicted by the Baur equation rather than the Flory equation. Therefore P(ET/CL) random copolyesters appear to exhibit pseudoeutectic type crystal structure where the melting point depression depends not only on the composition but also the segment lengths. In the X-ray analysis, the diffraction angle and d-spacing values of P(ET/CL) random copolyesters were changed. It appears that the unit cell structure has been deformed slightly. Thus small amounts of CL unit appear to have been incorporated into the crystal as defects. The crystallization rate of the P(ET/CL) random cololymers depended on the segment length and composition of ET units, and incorporation of CL units generally decreased the crystallization rate of P(ET/CL) copolymers. However, the copolymer containing 13 mole % CL units exhibited an increase in the crystallization rate. This appears to be due to the enhanced mobility of the copolymer chain and the sufficiently long ET segments which insures anchoring of the segments to the growing crystal.