• Title, Summary, Keyword: 시차 주사 열량 분석

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Preparation and Characterization of Nylon 6-Morpholinone Random Copolymers Based on ε-Caprolactam and Morpholinone (바이오 기반 ε-Caprolactam과 Morpholinone을 사용하여 중합한 나일론 6-모폴리논 랜덤 공중합체의 제조와 특성평가)

  • Kim, Hye Young;Ryu, Mi Hee;Kim, Dae Su;Song, Bong-Keun;Jegal, Jonggeon
    • Polymer Korea
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    • v.38 no.6
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    • pp.714-719
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    • 2014
  • Bio-based nylon 6-morpholinone random copolymers were prepared by the anionic ring opening polymerization of ${\varepsilon}$-caprolactam and morpholinone, both of which were prepared from lysine and glucose, respectively. From this work, a new biomass based nylon 6 with improved hydrophilicity was prepared. Optimizing the polymerization condition, copolymer with a viscosity-average molecular weight of 30000 g/mol was prepared, with a yield of 80%. It was possible to improve the hydrophilicity of nylon 6 by its copolymerization with morpholinone. The prepared nylon 6-morpholinone random copolymers were then characterized using several analytical methods such as DSC, TGA, XRD, viscosity measurement with U-shaped glass capillary viscometer and contact angle measurement.

A Study on Noxious Gases Analysis of Polyurethane foams (Polyurethane foam의 유해가스 분석에 관한 연구)

  • 이창우;김정환;현성호
    • Fire Science and Engineering
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    • v.14 no.2
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    • pp.7-13
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    • 2000
  • We had investigated thermal stability, Ignition temperature and fire gas for polyurethane foams used for manikin, cushion and interior finishing material. Decomposition of polyurethane foams with temperature was investigated using a DSC and the weight loss with temperature increase using a TGA in order to find the thermal hazard of polyurethane foams, and the ignition temperature of polyurethane foams according to species. We studied constant temperature among ignition temperature measuring methods. In addition, noxious gases for polyurethane foams according to combustion condition were analyzed using gas analyzer and GASTEC. As results, initial decomposition temperature of polyurethane foam used for interior finishing material was lower than those for manikin and cushion, and exothermic energy was higher. Ignition temperature of polyurethane foam of interior finishing material was $420^{\circ}$. All of combustion forms at $427^{\circ}$ and under were smoldering combustion, and it was combustion at $500^{\circ}$. As furnace temperature was increased, concentration of noxious gases such as carbon oxide, carbon dioxide, and hydrogen cyanide was increased. And nitrogen oxide at combustion condition($500^{\circ}$) was over 10 ppm.

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Cure Behavior, Thermal Stability and Flexural Properties of Unsaturated Polyester/Vinyl Ester Blends (불포화 폴리에스터/비닐에스터 블렌드의 경화 거동, 열안정성 및 굴곡 특성)

  • 이종문;조동환
    • Polymer Korea
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    • v.27 no.2
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    • pp.120-128
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    • 2003
  • The effects of catalyst, accelerator and blend composition on the cure behavior of unsaturated polyester resin (UPE), vinyl ester resin (VE) and their blends were studied using differential scanning calorimetry(DSC). The DSC thermograms strongly depend on each variable. The result shows that the small exothermic peak at 115$^{\circ}C$ is due mainly to the UPE component in the UPE/VE blends and the large one at 134~138 $^{\circ}C$ is due mainly to the VE component. The results also indicate that the change of the DSC thermogram measured after each blend was exposed to high temperature 18$0^{\circ}C$ and the fast curing conditions of a few tens seconds provide useful information on understanding the thermal processing of a blend at high speed. The measurements of resin flow time represent that there are three distinct stages of cure in the UPE/VE blends: induction, transition and macro-gelation stages, as similarly reported for UPE by others earlier. The thermal stability and flexural properties of the cured UPE are significantly improved by blending it with the VE, depending on the composition.

Characterization of energetic meterials using thermal calorimetry (등전환 방법을 이용한 고에너지 물질의 노화 효과 예측)

  • Kim, Yoocheon;Oh, Juyoung;Ambekar, Aniruda;Yoh, Jai-ick
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.547-553
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    • 2017
  • Thermal analysis of three energetic materials used in pyroelectric device was performed using Differential Scanning Calorimetry (DSC). The theoretical method for extracting the reaction rate equation of energetic materials using DSC experimental data is proposed and the reaction rate extraction is performed. The results of the DSC were analyzed by the conversion method such as Friedman. Activation energy and frequency factor according to mass fraction were extracted to complete the reaction rate equation. The extracted reaction rate equation has a form that represents the entire chemical reaction process, not the assumption that the chemical reaction process of the high energy material is a main step in several stages. It has considerable advantages in terms of theoretical and accuracy as compared with the chemical reaction rate form extracted through conventional thermal analysis experiments. Using the derived reaction rate equation, we predicted the performance change of three energetic materials operating on actual storage condition over 20 years.

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Study on Explosion Behavior of Air-born Rice Bran Dusts according to Ignition Energy (점화에너지 변화에 따른 쌀겨분진의 폭발 거동에 관한 연구)

  • 김정환;김현우;현성호;백동현
    • Fire Science and Engineering
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    • v.13 no.2
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    • pp.26-32
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    • 1999
  • We had investigated combustion pro야$\pi$ies of rice bran dusts. Decomposition of rice bran d dusts with temperature were investigated using DSC and the weight loss according to t temperature using TGA in order to find the thermal hazard of rice bran dusts, and the p properties of dust explosion in variation of their dust with the same particle size. Using H Hartman's dust explosion apparatus which estimate dust explosion by electric ignition after m making dust disperse by compressed air, dust explosion experiments have been conducted by v varying concen$\sigma$ation and size of rice br뻐 dust. According to the results for thermodynamic stability of rice bran dust, there are little change of initiation temperature of heat generation 때d heating value for used particle size. But i initiation temperature of heat generation decreased with high heating rate whereas d decomposition heat increased with particle size. Also, the explosion pressure was increased as t the ignition energy increased and average maximum explosion pressure was 13.5 kgv'cnt for 5 BJ/60 mesh and 1.5 뼈Ie미 dust concentration.

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A Study on Combustion Characteristics of Starch (전분 분진의 연소특성에 관한 연구)

  • 김정환;현성호;이창우
    • Fire Science and Engineering
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    • v.15 no.2
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    • pp.1-5
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    • 2001
  • We had investigated combustion properties of starch. Decomposition of starch scavenged by pre-cipitator of spinning factory with temperature were investigated using DSC and TGA. Combustion properties of starch according to amount were checked as temperature variation according to time using spontaneous ignition apparatus. Moreover, combustion properties with blowing or without blowing condition were checked in spontaneous ignition apparatus. As results of thermal analyses, increase in raising temperature causes initial smoldering temperature to move towards low temperature section. In addition, as amount of starch was increased, initial smoldering temperature was lowered. All of combustion forms were smoldering combustion. Initial smoldering temperature was low more slightly with blowing condition than without blowing condition in spontaneous ignition apparatus, which condition made heating value high.

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The Study for the characteristics of mechanically and thermally treated PET films (기계적 및 열적 처리된 PET 필름의 특성에 관한 연구)

  • 이종영;노지영;박성수
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.11 no.5
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    • pp.197-202
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    • 2001
  • The influence of thermal treatment and cold drawing was investigated for poly(ethy1ene terephthalate) films fabricated with various experimental conditions. Samples were elongated at room temperature under stepwise-drawing condition with the cross-head speed kom 0.5 to 500 mrdmin in an universal tester. Stress oscillation was observed in the stress-stnin curve of the samples heat-treatd at 50, 72 and $129^{\circ}C$ for 30 min, but it was not observed in the samples heat-treatd at $83^{\circ}C$ for 30 min. Thermal analyses of the samples were carried out in differential scanning calorimeter at the heating rate df $10^{\circ}C$/min/min, and the glass transition temperature, crystallization peak, enthalpy of fusion and degree of crystallinity were measured. The dynamic mechanical analyses of the samples were also carried out in a multiplefimction internal kiction pendulum at 1 Hz with the heating rate of $1.5^{\circ}C$/min, and it was found that the elastic modulus increases in the order of non-treated, heat-treated, and elongated samples.

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Study of Physico-Chemical Properties of N,N-Diacyl, O-Acyl Chitosan Oligomer (N,N-디아실, O-아실 키토산 올리고머의 물리화학적 특성에 관한 연구)

  • Lee, Ok-Sub;Ha, Byung-Jo;Kim, Jun-Oh;Park, Soeng-Kyu;Lee, Yoon-Sik
    • Applied Chemistry for Engineering
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    • v.8 no.3
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    • pp.365-373
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    • 1997
  • Chitosan oligomer having aldehyde group at reducing end was prepared by oxidative-deamination reaction of chitosan by using sodium nitrite, and the resulting aldehyde group was redeced to 2,5-anhydro-D-mannitol group. The obtained chitosan oligomer showed an average degree of polymerization(DP) 2 by GPC analysis. It was highly soluble in lipophilic solvents. N,N-diacyl, O-acyl chitosan oligomer was obtained trom the reaction between chitosan oligomer and acyl chloride under 4-dimethoxyaminopyridine catalyst. From DSC measurement, N,N-dilauroyl, O-lauroyl chitosan oligomer showed mesophase region, which was confirmed by polarizing microscope as thermotropic liquid crystalline state. X-ray diffraction pattern revealed that N,N-dilauroyl, O-lauroyl chitosan oligomer was highly crystalline, whereas chitosan oligomer was not.

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Mechanical Properties of PVC Composite Containing Iron Dust (제철 분진을 함유한 PVC 복합체 수지의 기계적 성질)

  • Nah, Jae-Woon;Kim, Myung-Yul
    • Elastomers and Composites
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    • v.33 no.5
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    • pp.370-376
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    • 1998
  • Mechanical properties of PVC[poly(vinylchloride)] composites containing the dust from blast and converter (Kwangyang Iron Co.) were investigated as a function of dust content. Tensile strength is increased, when the blast dust is mixed with PVC to the extent of 8.83wt % and impact strength is not significantly changed. From these results, it is suggested that blast dust containing CaO, SiO, MgO, $A1_2O_3$ and metallugical particle is compatible with PVC. Thermogravimetric analysis(TGA) showed that residual weight(%) at temperature $600^{\circ}C$ increased with the amount of blast dust and differential scanning calorimetry(DCS) showed that the thermal stability of PVC composite was increased when the weight ratio of blast dust was 8.83wt % X-ray diffractometry measurement also showed their blends and structures.

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Purification of Naphthalene from Naphthalene and 2-methylnaphthalene System by Layer MelMelt-Crystallization (경막형 용융결정화에 의한 나프탈렌과 2-메틸나프탈렌 혼합물로부터 나프탈렌의 분리)

  • Koh, Joo-Young;Kim, Chul-Uog;Park, So-Jin
    • Clean Technology
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    • v.12 no.3
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    • pp.157-164
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    • 2006
  • In order to purify 2-methylnaphthalene as main impurity included in naphthalene, SLE (solid-liquid equilibria) on two components system including naphthalene and 2-methylnaphthalene were measured and a layered melt crystallization has been studied. SLE in the present system is shown a simple eutectic mixture and the experimental results using DSC method is similar to the static method. Purity and yield of naphthalene in crystal depended mainly on the cooling rate: Increasing cooling rate, the purity of naphthalene in crystal increase, whereas the yield of that decrease. The effective distribution coefficient (Keff) as the degree of impurity removal was observed to decrease with decreasing of cooling rate. Therefore, the purity of naphthalene by melt crystallization can be enhanced to 5~7 %.

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