[비의류제품] Shear Flow Properties and Melt Spinning of Thermoplastic Polyvinyl Alcohol Melts 출판일 : 2005.09.01 저자 : Te-Hsing Ku, Chin-An Lin 서지사항 : Textile Research Journal, Volume 75, Issue 9, 681 페이지 등록일 : 2011.10.26 I 조회수 : 207 작성자 : admin |
Polyvinyl alcohol (PVA) is a water-soluble polymer, which is difficult to process in melt form
owing to its poor processability and thermoplasticity. The thermoplastic polyvinyl alcohol
(TPVA) prepared in this study is a brand new material for use in melt spinning. Satisfactory
processability of TPVA can be obtained efficiently by using the plasticization method. First,
the shear flow properties of TPVA made with various compositions were investigated. The
experimental results indicate that, besides decreased viscosity, increased plasticizer
loading and decreased degrees of polymerization of TPVA caused a decrease in the non-
Newtonian property and increased the temperature sensitivity of the viscosity. Additionally,
under the given experimental conditions, all the TPVA melts with various compositions
demonstrated satisfactory flowability and spinnability and no melt fracture occurred. With
regard to spinability, the TPVA melts displayed decreasing spinnability as the plasticizer
loading was increased or the degree of polymerization was decreased. Moreover, the
failure of TPVA melts is mainly attributed to ductile rupture. Observation of the WAXD
patterns of the TPVA as-spun fibers indicates difficulty in improving the crystallinity and
orientation of TPVA, which was due to the addition of plasticizer and the use of partially
hydrolyzed PVA. Furthermore, processing under appropriate spinning conditions and
avoiding excessively high temperature can maintain considerable water solubility of TPVA,
benefiting its application in conjugate spinning
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