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Physical Properties of UV-Curable Powder Coatings with Different Photoinitiator Contents (광개시제의 함량에 따른 UV 경화형 분체도료의 물리적 특성)

  • Moon, Je-Ik;Choi, Jae-Hoon;Hwang, Hyun-Deuk;Kim, Hyun-Joong;Kim, Nam-Hong
    • Journal of Adhesion and Interface
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    • v.9 no.2
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    • pp.32-37
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    • 2008

  • A series of UV-curable powder coatings with different contents of photoinitiator (0.5 wt%, 1 wt%, 2 wt%) were formulated and measured gel content, tensile strength of cured film. Heat-sensitive substrates such as MDF, plywood and PVC were coated UV-curable powder and cured coatings were measured physical properties by pendulum hardness tester, glossmeter, pull-off adhesion tester. With increasing photoinitiator content, adhesion force between coating and substrate decreased because of crosslinking density increasing. The results of pendulum hardness was not significantly changed but gloss was changed according to different substrates. Adhesion of UV-curable coatings was enough to apply for heat-sensitive substrates. From these results, we concluded that contents of photoinitiator was a effective factor in UV-curable powder coatings. UV-curable coatings was a portential candidate for heat-sensitive substrates.

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Secondary Grammaticalization and English Adverbial Tense (이차적 문법화와 영어부사의 시제)

  • Kim, Yangsoon
    • The Journal of the Convergence on Culture Technology
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    • v.6 no.4
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    • pp.115-121
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    • 2020

  • The primary aim of this paper is to discuss the historical development or grammaticalization of English adverbial -ly suffix and provide a diachronic analysis of manner adverbs and sentence adverbs from the perspective of secondary grammaticalization. The grammaticalization includes both the primary grammaticalization from a lexical to a grammatical and the secondary grammaticalization from a less grammatical to a more grammatical status. The emergence of the manner adverbs is due to the primary grammaticalization from OE adjectival suffix -lic to ME adverbial suffix -ly. In contrast, the emergence of sentence adverbs is due to the secondary grammaticalization from manner adverbs in VP domain to sentence adverbs in TP domain with grammatical features of tense and modality. This paper concludes that the secondary grammaticalization of the English adverbial -ly suffix includes the change from manner adverbs to sentence adverbs which obtain a new grammatical function of tense and modality.

  • https://doi.org/10.17703/JCCT.2020.6.4.115 인용 PDF KSCI

The Power-pack combustion test and Evaluatin of Technology Demonstraion Model for Sataged Combustion Cycle Engine (다단연소엔진 기술검증시제 파워팩 시험 평가)

  • Jeon, Junsu;Kim, Seungryong;Kim, Sunghyuk;Kim, Seunghan;Kim, Chaehyoung;Seo, Daeban;So, Younseok;Woo, Seongphil;Lee, Kwangjin;Yi, Seungjae;Lee, Jungho;Im, Jihyuk;Yu, Byungil;Cho, Namkyung;Hwang, Changhwan;Han, Yeoungmin
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2017.05a
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    • pp.104-107
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    • 2017

  • The power-pack combustion test of technology demonstration model(TDM0) for 9 tonf-class staged combustion cycle engine development was conducted in the Upper-stage Engine Test Facility(UETF) of Naro Space Center. The power-pack model of TDM0 was composed of a pre-burner, a turbo-pump and propellant supply systems without a main combustor. In the power-pack combustion test, we confirmed the linked working condition and verified the main functional variation of the power-pack for the engine system test.

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