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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2016.9
- 수록면
- 125 - 133 (9page)
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초록· 키워드
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In this study, efforts were made to enhance the mechanical properties of the poly(vinyl alcohol) (PVA) fibers of medium molecular weight(number-average degree of polymerization=1735) varying the ratio in DMSO/H2O mixed solvent and spinning/drawing conditions. The gel fibers prepared from pure DMSO were opaquely frozen in the coagulating bath of -20℃. However, transparent gel fibers were formed without freezing for the mixture to contain water less than 80wt%. As the amount of water in the mixture increased the residual solvent in the coagulated gel fibers decreased ranging from 85 to 42wt%. The complex viscosity increased with increasing PVA concentration in 80/20 DMSO/H2O exhibiting remarkable shear thinning at 18wt%. In the Cole-Cole plot, the 18wt% PVA solutions gave a deviated curve from 12 and 15wt% ones. Thus the optimum PVA concentration for the spinning processing of medium MW PVA solutions in 80/20 DMSO/H2O was determined to 18wt% with rheological concept. Low degree of drawing during hot drawing process in the dry state was available for high bath draft in the coagulation bath. The most improved mechanical properties were observed by applying the highest possible draw ratio attained by reducing bath draft over multi-step drawing process. In the given bath draft, linear relationship was observed between both tensile strength and modulus and draw ratio showing the inflection points at the draw ratio of 19.5 and 18.0 for tensile strength and modulus, respectively.
목차
Abstract
1. Introduction
2. Experimental
3. Result and Discussion
4. Conclusions
References
참고문헌 (27)
참고문헌 신청
[학술지(정기간행물)] - P. Smith / 1979 / Lemstra, Ultrahigh-Strength Polyethylene Filaments by Solution Spinning/Drawing, Influence of Solvent on the Drawability / Die Makromolekulare Chemie 180 (12) : 2983 ~
[학술지(정기간행물)] - P. Smith / 1981 / Tensile Strength of Highly Oriented Polyethylene / J. of Polymer Science Part B : Polymer Physics 19 (6) : 1007 ~
[학술지(정기간행물)] - K. Tashiro / 1978 / Calculation of Three-Dimensional Elastic Constants of Polymer Crystals. 2. Application to Orthorhombic Polyethylene and Poly(Vinyl Alcohol) / Macromolecules 11 (5) : 914 ~
[학술지(정기간행물)] - I. Sakurada / 1967 / Elastic Moduli of the Crystal Lattices of Polymers / J. of Polymer Science Part C : Polymer Symposia 15 (1) : 75 ~
[학술지(정기간행물)] - T. Tanigami / 1994 / Ageing of Poly(Vinyl Alcohol)Gels Prepared from Dimethylsulfoxide/Water Solutions / Polymer 35 (12) : 2573 ~
[학술지(정기간행물)] - P. Smith / 1981 / Tensile Strength of Highly Oriented Polyethylene / J. of Polymer Science Part B : Polymer Physics 19 (6) : 1007 ~
[학술지(정기간행물)] - K. Tashiro / 1978 / Calculation of Three-Dimensional Elastic Constants of Polymer Crystals. 2. Application to Orthorhombic Polyethylene and Poly(Vinyl Alcohol) / Macromolecules 11 (5) : 914 ~
[학술지(정기간행물)] - I. Sakurada / 1967 / Elastic Moduli of the Crystal Lattices of Polymers / J. of Polymer Science Part C : Polymer Symposia 15 (1) : 75 ~
[학술지(정기간행물)] - T. Tanigami / 1994 / Ageing of Poly(Vinyl Alcohol)Gels Prepared from Dimethylsulfoxide/Water Solutions / Polymer 35 (12) : 2573 ~
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UCI(KEPA) : I410-ECN-0101-2017-577-001336368