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Polysiloxane 과 Polysulfone 과의 Copolymer 에 관한 硏究
韓貞璉 단국대학교 대학원 1983 學術論叢 Vol.7 No.-
Copolymers have been synthesized from dihydroxyl-terminated polysulfone and bisdimethylamine-terminated polydimethylsiloxane oligomers. Polysulfone is synthesized from the disodium salt of bisphenol A and dichloro-diphenyl-sulfone in chlorobenzene-dimethyl sulfoxide solution. The hydroxyl-terminated oligomers used in this work were prepared by this procedure, by using excess bisphenol A disodium salt, fellowed by neutralization with oxalic acid. Oligoers of varying M ̄n, as measured by potentiometric end group titration, were prepared by using different ratios of the two monomers. The morphology of the copolymers can also be controlled by varying oligomer molecular weight. The alternating -(-A―B-)_n- block structure of the copolomers is strictly controlled since the starting materials are pairs of preformed, well-characterized oligomers which can react only with their opposite kinds. The block copolymers are soluble, amorphous, and transparent, and diplay good thermal and hydrolytic stability.
양재건,한정련 한국섬유공학회 1985 한국섬유공학회지 Vol.22 No.5
Polydimethylsilane(PS) was synthesized by the reaction of dimethyldichlorosilane with potassium and sodium alloy(50:50) in the cosolvent of xylene and THF(8:2) for 16hrs at final temp. 13$0^{\circ}C$, the yield was 83%. But the yield was increased to 92% when 0.04% naphthalene of K-Naalloy was added to the reaction mixture. Polycarbosilane(PCS) was prepared by pyrolysis of polydimethylsilane and the yield was 34-36% when reaction was carried out at 320-45$0^{\circ}C$ under nitrogen atmosphare without catalyst, but the yield was increased to 62-67% when 0.5-1% of borosilane was added as catalyst. They were identified by means of IR, UV. NMR. and elemental analysis and the molecular weight was determined by GPC.
앙고라 토모섬유의 방적성 개선에 관한 연구(I) - HCOOH/$H_2O_2$에 의한 표면처리 -
지동선,한정련 한국섬유공학회 1997 한국섬유공학회지 Vol.34 No.11
The effects of surface treatment carried out to improve the spinnability and anti-static property of angora rabbit fibers were studied. Angora rabbit fibers were treated with a mixture of 0.5%(wt%) formic acid and 1.5%(wt%) hydrogen peroxide (1:1 v/v) for 60, 80 or 100 minutes at 40, 60 or 80 $^{\circ}C$. The effects of treatment time and temperature on the surface structure, tenacity, elongation, tensile modulus and surface resistance were investigated. Scales of the cuticle layer were effectively raised without lowering the tenacity when treated for 80 minutes that of the untreated. The tenacity and the tensile modulus decreased slightly with the increase of treatment time and temperature, while the elongation and the surface resistance increased markedly. It should be noted that the influence of treatment temperature on the decrease in surface resistance of the treated fibers is more significant than that of treatment time.