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Won Seok Lyoo
Researcher at Korea Institute of Science and Technology
Publications - 35
Citations - 557
Won Seok Lyoo is an academic researcher from Korea Institute of Science and Technology. The author has contributed to research in topics: Vinyl alcohol & Polymerization. The author has an hindex of 12, co-authored 35 publications receiving 546 citations. Previous affiliations of Won Seok Lyoo include Seoul National University & Yeungnam University.
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New and General Methods for the Synthesis of Arylmethylene Bis(3-Hydroxy-2-Cyclohexene-1-Ones) and Xanthenediones by EDDA and In(OTf)3-Catalyzed One-Pot Domino Knoevenagel/Michael or Koevenagel/Michael/Cyclodehydration Reactions
TL;DR: In this article, an efficient one-pot synthesis of arylmethylene bis(3-hydroxy-2-cyclohexene-1-ones) and xanthenediones by EDDA and In(OTf)3-catalyzed reactions was developed starting from dimedone and aryls aldehydes.
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Preparation of syndiotacticity‐rich high molecular weight poly(vinyl alcohol) microfibrillar fiber by photoinitiated bulk polymerization and saponification
Won Seok Lyoo,Wan Shik Ha +1 more
TL;DR: In this paper, a high molecular weight poly(vinyl pivalate) (PVPi), having a number-average degree of polymerization (P n ) of 13,000-28,000, was obtained at conversions below 30% and converted by saponification to a syndiotacticity-rich HMW polyvinyl alcohol (PVA) microfibrillar fiber with P n of 7300-18,300, syndiotactic diad (S-diad) and triad contents of ∼ 64% and ∼39%, respectively
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Structure and properties of microfibrillar poly(vinyl alcohol) fibres prepared by saponification under shearing force of poly(vinyl pivalate)
Won Seok Lyoo,Wan Shik Ha +1 more
TL;DR: In this article, high-strength, microfibrillar poly(vinyl alcohol) fibres (PVA fibrils) having a number-average degree of polymerization (P n ) of 4500-20 000, a degree of saponification ( DS ) of 85.0-99.9% and a syndiotactic dyad (S-dyad) content of 57-64% were obtained by fibrillation.
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In situ fibrillation of poly(vinyl alcohol) during saponification of poly(vinyl ester) (1). Chemorheological and morphological investigations of in situ fibrillation
Won Seok Lyoo,Wan Shik Ha +1 more
TL;DR: In this article, the formation mechanism of high strength microfibrillar polyvinyl pivalate (PVA) fiber is proposed by examining and observing the changes of flow birefringence, shear viscosity of reaction solution, degree of saponification, and shape of reaction product during the reaction process.
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Rheological and rheo-optical properties of high molecular weight syndiotactic and atactic polyvinylalcohol solutions
TL;DR: In this paper, the rheological and rheo-optical properties of solutions of high molecular weight polyvinylalcohol (PVA) with different syndiotactic diad contents in dimethylsulfoxide (DMSO) were investigated in terms of tacticity, molecular weight, and degree of saponification.