• Title/Summary/Keyword: 열경화성

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Time-Temperature-Transition Diagrams with Liquid Crystalline Phase Changes of Liquid Crystalline Epoxy (열경화성 액정 에폭시 수지의 액정상 변화를 포함한 시간-온도-전이 다이어그램)

  • Seung Hyun Cho
    • Composites Research
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    • v.37 no.3
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    • pp.215-218
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    • 2024

  • Liquid crystalline thermosetting epoxy oligomer DD-A was synthesized with Diglycidyl ether of 4,4'-dihydroxy-α-methylstilbene (DGE-DHMS) and aniline in a ratio of 2:1 and cured with a catalytic curing agent, 1-Methyl Imidazole. The gelation times and vitrification times were measured to create Time-Temperature-Transition Diagrams with liquid crystalline phase changes. It was found that the gelation and vitrification times were decreased as the concentration of curing agent increased, and the vitrification curve showing a typical S-shape was confirmed.

  • https://doi.org/10.7234/composres.2024.37.3.215 인용 PDF HTML

Synthesis of tung oil-based thermoset resin and its thermal·mechanical properties (Tung oil을 이용한 바이오 기반 열경화성 수지 합성 및 이의 열적·물리적 특성 연구)

  • Kim, Han-Eol;Lee, Jong-eun;Nam, Byeong-Uk
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.19 no.11
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    • pp.24-30
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    • 2018

  • Various investigations of vegetable oil extracted from natural resources are underway because of their low cost and environmental value. On the other hand, the double bonds in vegetable oil should be substituted to other high reactive functional groups due to their low reactivity for synthesizing bio-polymeric materials. ${\alpha}$-eleostearic acid, which consists of a conjugated triene, is the main component of tung oil, and the conjugated triene allows tung oil to have higher reactivity than other vegetable oils. In this study, tung oil was copolymerized with styrene and divinylbenzene to make a thermoset resin without any substitution of functional groups. The thermal and mechanical properties were measured to examine the effects of the composition of each monomer on the synthesized thermoset resin. The results showed that the products have only one Tg, which means the synthesized thermoset resins are homogeneous at the molecular level. The mechanical properties show that tung oil acts as a soft segment in the copolymer and makes a more elastic product. On the other hand, divinylbenzene acts as a hard segment and makes a more brittle product.

  • https://doi.org/10.5762/KAIS.2018.19.11.24 인용 PDF KSCI HTML