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유연쇄를 사용한 개질 폴리에스터 공중합체의 제조와 그 특성(II) -Neopentyl glycol 단위체를 함유한 공중합 폴리에스터의 결정화 거동-
손태원,한송정,고재왕,이건민,Son, Tae-Won,Han, Song-Jung,Ko, Jae-Wang,Lee, Gun-Min 한국섬유공학회 2009 한국섬유공학회지 Vol.46 No.6
Poly(ethyleneterephthalate)(PET) was chemically modified through copolymerization of bis(2-hydroxyethyl) terephthalate (BHET) and neopentyl glycol (NPG). NPG was used as flexible chain moiety to enhance spinnability by retarding the stress-induced crystallization during spinning. The properties of the copolyester were investigated by using GPC, DSC(differential scanning calorimetry), TGA(thermogravimetry analysis), and $^1H-NMR$. From the result of GPC, it was found that the copolyesters were able to get higher molecular weight and narrower molecular weight distribution than those of PET obtained from BHET alone. Non-isothermal crystallization behavior of the copolymers was investigated by differential scanning calorimetry (DSC). Non-isothermal crystallization measurements showed that, with increasing the amount of comonomer, Tcm decreased.. It seems that the rate of crystallization of copolymer might be retarded during melt-spinning. Isothermal melt-crystallization measurement demonstrated that the rate of crystallization and the Avrami index were reduced with increasing the amount of comonomer.
형태안정성 PCM: n-Octadecane과 초고분자량 폴리에틸렌으로 구성된 고화 젤의 제조 및 특성
손태원,박재훈,이우승,박소현,문정언,권오경,Son, Tae-Won,Park, Jae-Hoon,Lee, Woo-Seung,Park, So-Hyun,Moon, Jung-Eon,Kwon, Oh-Kyeong 한국섬유공학회 2012 한국섬유공학회지 Vol.49 No.4
Phase change materials based on UHMWPE blended with n-octadecane were studied in this paper. In addition, this paper reviews recent studies on the preparation of shape stabilized phase change materials (SSPCM), such as SSPCM from UHMWPE and n-octadecane, their basic properties and possible applications to latent heat storage. The preparation methods used were the melting methods. Shape stabilized PCM (SSPCM) prepared for FT-IR spectroscopy, SEM, DSC, XRD, and ARES results of the analysis for shape stability to improve heat capacity were identified. The optimum compounding conditions included a content of 40% n-octadecane. The SSPCM 40% demonstrated less deterioration of physical property and effective thermal property compared with other conditions. As a result, these SSPCMs could be said to be acceptable heat storage & release materials for various products.
전기방사를 이용한 Pullulan Electrospun Fiber Webs의 제조 및 특성
손태원(Tae Won Son),이건민(Gun Min Lee),이동원(Dong Won Lee),이주현(Ju Hyun Lee),임학상(Hak Sang Lim) 한국고분자학회 2012 폴리머 Vol.36 No.2
전기방사는 휘발성 용매에 녹아있는 다양한 물질들을 마이크로 크기의 섬유로 제조하는데 사용되고 있다. 이 번 연구에서는 물을 용매로 사용하여 pullulan을 전기 방사하였다. 부드러운 섬유를 얻기 위하여 pullulan 농도와 전 압을 최적의 조건으로 설정하였다. Pullulan 농도는 pullulan 용액의 점도와 표면 장력에 큰 영향을 받는다. Bead 형태 의 pullulan 전기방사 섬유는 5 wt%이하의 농도에서 얻어진다. Pullulan 용액의 농도가 10 wt%로 유지되고, 전압이 15 kV에 고정되었을 때, pullulan 섬유의 평균 직경은 200 nm로 감소하였다. Pullulan electrospun 섬유는 높은 용해도, 유연성, 부드러움과 강한 접착성을 보여준다. Electrospinning is a versatile process used to prepare micro or nano sized fibers from various materials dissolved in volatile solvents. This study reports electrospun pullulan fibrous webs fabricated through electrospinning using water as a solvent. The electrospinning conditions such as pullulan (PUL) concentration and applied voltage were optimized in order to obtain smooth electrospun fibers. The concentration of PUL greatly influenced the viscosity and surface tension of PUL solution. PUL beaded electrospun fibers were obtained from PUL solutions with concentrations lower than 5 wt%, while homogenous electrospun fibers were prepared from solutions with high concentration and high viscosity. The average diameters of PUL fibers were decreased to 200 nm when the polymer concentration was kept at 10 wt% and the applied voltage was fixed at 15 kV during electrospinning. PUL electrospun fiber exhibited higher solubility, flexibility, softness and adhesive strength.
Poly(vinylidene fluoride) 다층 필름의 제조 및 특성
손태원(Tae Won Son),김종환(Jong Hwan Kim),최원미(Won Mi Choi),한비비(Fei Fei Han),권오경(Oh Kyeong Kwon) 한국고분자학회 2011 폴리머 Vol.35 No.2
전자 기기의 빠른 발전에 따른 무선 기기들의 사용은 급격히 늘어나고 있다. 그래서 이런 제품에 자가 발전이 가능한 재료를 적용시키는 사례가 점차 늘고 있다. 여기에 사용되는 재료로서 poly(vinylidene fluoride)(PVDF)가 있는데 PVDF는 piezoelectricity를 낼 수 있는 특별한 결정구조인 β-phase를 가지고 있다. 이 논문에서는 piezoelectricity에 결정적인 영향인 β-phase 함량을 증가시키기 위해 다층 PVDF 필름을 제조하였다. 이 PVDF 필름은 용매인 DMAc에 10%로 용해시킨 것으로 spin rate는 850 rpm, spin time은 60초이며 건조온도는 60 ℃이다. 비교적으로 다층 필름은 단일 층보다 더 높은 β-phase함량을 나타내었다. 이 β-phase함량은 4-layer 필름이 되기까지 점차 증가되었으며 최대 함량은 7.72이다. Along with the fast development of electronics, the demands of portable electronics and wireless sensors are growing rapidly. The need for self-powering materials capable of powering the electrical devices attached to them is increasing. The piezoelectric effect of polyvinylidene fluoride (PVDF) can be used for this purpose. PVDF has a special crystal structure consisting of a β-phase that can produce piezoelectricity. In this paper, multilayer PVDF films were fabricated to increase the β-phase content. A solution of 10% concentration N,N-dimethylacetamide (DMAc) in PVDF (PVDF/DMAc) was used to fabricate the films via spin coating technique with the following optimum process parameters: a spin rate of 850 rpm, spin time of 60 s, drying temperature of 60 ℃, and drying time of 30 min. Compared with single-layer PVDF films, the multilayer films exhibited higher β-phase content. The β-phase content of the films increased gradually with increasing number of layers until 4. Maximum ratio of β-phase content was 7.72.
m-aramid(poly(m-phenylene isophthalamide))film의 제조 및 특성
손태원(Tae-Won Son),김종환(Jong-Hwan Kim),이우승(Woo-Seung Lee) 제어로봇시스템학회 2012 제어로봇시스템학회 합동학술대회 논문집 Vol.2012 No.7
Poly (m-phenylene isophthalamide) (PMIA) is one of the most important aromatic polyamides and has been widely used because of its high thermal resistivity combined with excellent mechanical properties. Also PMIA has superior electrical properties. Meta-linked aromatic polyamide was synthesized by solution polymerization of m-phenylene diamine with Isophthaloyl chloride in a polar organic solvent such as dimethylacetamide(DMAc). When forming PMIA films, properties of film can be different according to DMAc contens in polymer. Thus, PMIA film evaporates DMAc as solvent at 80℃ for 2 hours. By contrast, we make control group which has been stretching maximum length using dried film. And lastly, stretched film has been heat treated at 200℃ for 10mins. Therefore, through this method, these films are prepared at each concentration. To analyze PMIA film properties which was prepared in the same way and also properties of PMIA films are investigated through the analysis of Instron, XRD, FT-IR, SEM and TGA