수도권 근교농촌의 공간구조 변화특성에 관한 연구

학위논문(석사)--서울대학교 대학원 :생태조경학과,2001.Maste

2,5-티오페닐렌 결합을 갖는 폴리우레아의 합성과 성질 ;

학위논문(박사) - 한국과학기술원 : 화학과, 1987.2, [ viii, 120 p. ]한국과학기술원 : 화학과

2,5-티오페닐렌 결합을 포함하고 있는 폴리우레탄의 합성 및 성질에 관한 연구

학위논문(석사) - 한국과학기술원 : 화학과, 1984.2, [ [iii], 50 p. ]A diisocyanate monomer, thiophenylene-2,5-diisocyanate was synthesized by specific reaction of adipic acid with thionyl chloride and pyridine followed by nucleophilic substitution and Curtius rearrangement. Polyurethanes containing 2,5-thiophenylene linkage were synthesized by the polycondensation of thiophenylene-2,5,-diisocyanate with various diols in N,N-dimethylformamide at 40-70℃. polymerization yields were 90-100%. The structures of thiophenylene-2,5-diisocyanate and resulting polymers were identified by IR and $H^1$-NMR spectroscopy. IR spectrum of thiophenylene-2,5-diisocyanate showed chracteristic absorption bands at $3100 cm^{-1}$ (C-H stretching) and $2250 cm^{-1}$ (-N=C=O stretching), those of polyurethanes were observed at $3300-3280 cm^{-1}$ (N-H stretching) and $1750-1710 cm^{-1}$ (carbonyl stretching) region. The physical properties of these polyurethanes were also investigated. The resulting polyurethanes had inherent viscosities in the range of 0.54-0.33 dl/g. Although most of these polymers were soluble in polar solvents, polyurethanes obtained from aromatic diols were quite insoluble in common organic solvents. These polyurethanes except for those obtained from aromatic diols revealed relatively good thermal stability. The TGA data showed 5% weight losses of polyurethanes at 252-327℃. The DSC curves showed that these polymers have melting and glass transition temperatures in the range of 120-232℃ and 35-85℃, respectively.한국과학기술원 : 화학과

Conformation-Insensitive Ambipolar Charge Transport in a DPP-Based Copolymer Containing Acetylene Linkages

2

Highly Efficient, Phosphorescent White Organic Light-Emitting Diodes (WOLEDs) Fabricated by Solution Processes

1

New dithieno[3,2-b:2`,3`-d]phosphole-based copolymers for efficient polymer solar cells

1

Conformation-Insensitive Ambipolar Charge Transport in a Diketopyrrolopyrrole(DPP)-Based Co-polymer Containing Acetylene Linkages (OFET)

2

Highly effi cient solution-processed small-molecule organic light emitting devices with novel tetraphenylsilane blue phosphorescent host materials

1

Naphtho[2,1-b:3,4-b']dithiophene-Based Bulk Heterojunction Solar Cells: How Meolcular Structure Influences Nanoscale Morphology and Photovoltaic Properties

2

A series of new small bandgap conjugated polymers based on dithieno[3,2-b:2’,3’-d]phosphole for high-performance organic solar cells

2