Preparation of Coil-Embolic Material Using Syndiotactic Poly(vinyl alcohol) Gel Spun Fibers
- Preparation of Coil-Embolic Material Using Syndiotactic Poly(vinyl alcohol) Gel Spun Fibers
- 오태환; 서영호; 한성수; 주상우; 길명섭[길명섭]
- RHEOLOGICAL PROPERTIES; HOFMEISTER SERIES; VINYL-ACETATE; SAPONIFICATION; WATER; POLYVINYL-ALCOHOL); HYDROXYAPATITE; EMBOLIZATION; PARTICLES
- Issue Date
- POLYMER SOC KOREA
- POLYMER-KOREA, v.37, no.4, pp.486 - 493
- The structure, morphology, and physical properties of syndiotatic poly(vinyl alcohol) (s-PVA) gel spun fibers were investigated to prepare polymeric embolization coils. S-PVA was prepared by saponification of the poly(vinyl acetate)/poly(vinyl pivalate)(PVAc/PVPi) copolymer. The viscosity of s-PVA solutions showed shear thinning behavior and the solution formed a homogeneous phase. Based on shear viscosity change with concentration, the optimum dope concentration was selected as 13 wt%, after which s-PVA fibers were spun and the solvent was removed. The fibers were then drawn with a maximum draw ratio of 15. A polymeric embolization coil was made of the s-PVA gel-spun fibers. The fibers were wound densely onto rigid rod and then annealed at different annealing temperatures. The polymeric embolization coil annealed at 200 degrees C was similar to metallic coils and its shape was maintained well after extension. Overall, gel-spun PVA fibers performed well for the preparation of primary and secondary coils to replace metallic coils.
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