• 제목/요약/키워드: bio materials

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아세틸화 케나프 섬유와 폴리락트산으로 구성된 바이오복합재료의 물성 평가 (Performance Evaluation of Bio-Composites Composed of Acetylated Kenaf Fibers and Poly(lactic acid) (PLA))

  • 정택준;이병호;이현지;권혁진;장원범;김현중;엄영근
    • Elastomers and Composites
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    • 제46권3호
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    • pp.195-203
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    • 2011

  • 친환경 소재인 바이오복합재료(bio-composites)의 제조를 위하여 기질 고분자로는 poly(lactic acid) (PLA)를 그리고 충전제(filler)로는 케나프 섬유(kenaf fiber)를 사용하였다. 또한 섬유와 고분자 사이의 계면결합 향상을 위해 아세틸화 케나프 섬유(acetylated kenaf fiber)와 상용화제(compatibilizer)를 첨가해 주었다. 본 연구에서는 화학처리와 상용화제가 기계적-점탄성과 형태학적 특성에 미치는 영향을 평가하였고, 섬유가 소수성이 될수록 기질 고분자와 높은 계면결합을 가지며 물성과 형태학적 성질 또한 향상된다는 결과를 보여줬다. 그러나 점탄성과 유리전이온도에는 큰 영향을 미치지 않는다는 사실을 확인하였다.

  • https://doi.org/10.7473/EC.2011.46.3.195 인용 PDF KSCI

Effects of Oxidation on the Order-disorder Transition in NiPt Alloy Nano Crystals

  • 서옥균;황재성;송다현;이지연;최정원;이수웅;강현철;노도영
    • 한국진공학회:학술대회논문집
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    • 한국진공학회 2012년도 제42회 동계 정기 학술대회 초록집
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    • pp.253-253
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    • 2012

  • The effects of oxidation on the order-disorder transition in NiPt bimetallic alloy crystal have been investigated using in-situ synchrotron x-ray scattering technique. The temperature dependence of the crystal structure and the order parameter were measured during in-situ heating and cooling under vacuum and oxygen environments. The order-disorder transition temperature of NiPt alloy crystals in vacuum was between $615^{\circ}C$ and $627^{\circ}C$. On the other hand under oxygen environment, the transition temperature decreases by about $31^{\circ}C$ after the oxidation. The change of the transition temperature can be explained by the formation of NiO crust on the surface of NiPt crystal, which alters the composition of the Ni and Pt atoms. Since the transition temperature depends sensitively on the Ni-Pt composition, the transition temperature changes as Ni atoms diffuse out to form NiO.

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Thermal behavior of Flame Retardant Filled PLA-WF Bio-Composites

  • Choi, Seung-Woo;Lee, Byoung-Ho;Kim, Hyun-Joong;Kim, Hee-Soo
    • Journal of the Korean Wood Science and Technology
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    • 제37권2호
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    • pp.155-163
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    • 2009

  • This study examined the thermal stability of PLA-WF bio-composites. Wood flour (WF)-filled PLA bio-composites were reinforced with the flame retardants, Melamine pyrophosphate (MPP), resorcinol bis (diphenyl phosphate) (RDP) and zinc borate (ZB). The flame retardant was compounded with PLA and natural biodegradable filler. The thermal properties of the biodegradable polymer and bio-composites reinforced with the flame retardant were measured and analyzed by DSC, DMA and TGA. The results showed that the flame retardant-reinforced biodegradable bio-composite exhibited improved thermal properties.

  • PDF KSCI