• Prospectives of Industrial Chemistry
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• v.24 no.2
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• pp.31-37
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• 2021

일반적으로 cross-link된 열경화성 에폭시수지는 유기용매에 용해되지 않고 열에 용융되지 않는 특성이 있다. 따라서 에폭시수지가 사용된 물질, 특히 탄소섬유강화플라스틱(carbon fiber reinforced plastic, CFRP)은 재활용이 어렵고, 사용 후 폐기물 처리에 막대한 비용이 소비되고 있다. 본 원고는 열경화성 에폭시수지 응용물 중 CFRP의 재활용을 중심으로 한 친환경적 재활용 기술에 관하여 정리하였다. 특히, CFRP의 구성요소인 탄소섬유(CF)와 기지재인 에폭시수지를 모두 재활용 할 수 있는 화학적 방법에 관하여 보고한다. 더 나아가 열경화성 에폭시수지의 화학적 분해물의 재이용기술에 관한 예를 소개한다.

• Polymer(Korea)
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• v.35 no.2
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• pp.176-182
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• 2011

Liquid crystalline aromatic polyesters (LCPs) are representative examples of thermotropic liquid crystalline polymers, whose structure-property relationships have been the subject of many researches. In this study, we synthesized organo-soluble liquid crystalline aromatic polyesters, and their composites with acetylene-terminated thermoset resins were prepared and characterized. Soluble LCPs were synthesized by employing 6-hydroxy-2-naphthoic acid, terephthalic acid, isophthalic acid, and 4-aminophenol as monomers via condensation polymerization based on transesterfication and transamidation. Acetylene-terminated thermoset resins were synthesized by the reaction of 4-ethynylaniline with terephthaloyl dichloride, isophthaloyl dichloride or 4,4'-biphenyldicarbonyl dichloride. We prepared the soluble LCP/thermoset composites by solution blending followed by thermal treatment. The thermal stability, thermal expansion coefficient, and dielectric properties of the composite were studied.

• Journal of the Korean Society for Nondestructive Testing
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• v.23 no.5
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• pp.409-417
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• 2003

Cure monitoring can be used to improve the quality and productivity of thermosetting resin matrix composite products during their manufacturing process. In this work, the sensitivity of dielectrometry was improved by adequate separation the efforts of sensor and externals on the measured signal. A new algorithm to obtain the degree of cure during dielectric cure monitoring of glass/polyester and glass/epoxy composites was developed by employing a function of both temperature and dissipation factor, in which five cure monitoring parameters were used to calculate the degree of cure. The decreasing pattern of dissipation factor was compared with the relationships between the degree of cure and the resin viscosity. The developed algorithm might be employed for the in situ cure monitoring of thermosetting resin composites.

• Polymer Science and Technology
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• v.11 no.5
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• pp.603-607
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• 2000

• Proceedings of the Korean Fiber Society Conference
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• 1998.10a
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• pp.422-425
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• 1998

섬유강화 복합재료는 고성능 섬유와 고분자 수지를 조합하여 재료의 물성 향상 및 고기능화를 목적으로 만들어지는 재료이며, 사용되는 고분자 매트릭스의 종류에 따라 열가소성 복합재료와 열경화성 복합재료로 나뉘어진다. 이 중 열경화성 복합재료에 관한 연구 및 그의 실용화는 오래 전부터 활발히 진행되어 산업재료 및 군사, 우주용 재료로 각광을 받아 왔으나 최근 지구 환경문제가 심각해지면서 사용 후 분해 및 재활용이 가능한 열가소성 복합재료에 관한 연구에 관심을 가지게 되었다. (중략)

• Proceedings of the Korean Society For Composite Materials Conference
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• 1999.04a
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• pp.103-108
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• 1999

A synthesized model of pultrusion process considering thermally induced deformatiion was established. The model was composed of liquid resin flow model thermo-chemical analysis and linear elastic analysis. in order to verify the above-mentioned models several experiments were performed. A laboratory scale pultrusion line was established and glass/polyester composites were fabricated. the experimental results were compared with the calculated ones. The model successfully could estimate degree of cure pulling force and amount of process-induced deformation.

• Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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• 1988.11a
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• pp.49-56
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• 1988

자동차의 동력전달 수단으로 사용되는 클러치는 그 기능에 따라 수동식과 자동식으로 구분된다. 전자의 경우 transmission과 engine의 동력을 dry contact mechanism으로 단속 제어하는 반면 후자는 hadraulic torque drive와 engine의 동력을 transmission box내의 기어유에 의한 wet contact mechanism으로 단속 제어한다. 자동식 클러치에 사용되는 paper facing은 cellulose fiber를 기본으로 하여 열경화성 수지 및 무기충진제등을 함유하고 있으나, 특히 무기충진제의 종류 및 첨가량이 paper facing의 마찰특성에 크게 영향을 미친다. 본 연구는 목재펄프(wood pulp), 린터펄프(linter pulp)등의 펄프를 주체로 하고 열경화성 수지와 무기충지제등을 첨가한 마찰재를 제조하여 무기충진제들의 마찰특성에 미치는 영향을 조사함으로써 paper facing의 기초 자료를 얻는데 그 목적이 있다.

• Proceedings of the Materials Research Society of Korea Conference
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• 2001.05a
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• pp.170-170
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• 2001

• 한국신재생에너지학회:학술대회논문집
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• 2009.11a
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• pp.339-340
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• 2009

• Applied Chemistry for Engineering
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• v.26 no.4
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• pp.439-444
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• 2015

Several attempts to design the best-available thermosetting road markings by using MMA to improve the durability and retroreflectivity are presented in this paper. In order to improve field applicability, the components of main materials were designed by means of reducing the hardening time lower than eight minutes. The optimum mixing ratio of thermosetting road marking was TSRM-6 composed of 15.6 wt% of MMA monomer ($Tg=105^{\circ}C$), 6.0 wt% of PMMA (MW = 70,000, $Tg=60^{\circ}C$) and 1.2 wt% of TMPTA (MW = 338, $Tg=27^{\circ}C$). Also the homogeneous mixing of all components was necessary. The use of ceramic glass beads with an optimized TSRM-6 exhibited excellent performance by achieving retroreflectivity coefficients of 431, 354 and $172mcd{\cdot}m^{-2}{\cdot}lux^{-1}$ for dry, wet and rainy test condition, respectively at two hundred thousand cycles.