The Study On BaSO₄/PVA Blend And Its Composite Fiber

Concrete is one of the most consumable and the most versatile building materials.As an important structure material,its strength and durability have been paid more and more attention.The fiber reinforcement is the principal way to get high performance concert,and the amount and distribution of fiber in matrix have a great influence on the performance of the composite material.So a detectable fiber is needed in a great urgent. Thereby countermeasure can be adopted to improve the fiber dispersion and the performance of the concrete.Poly(vinyl alcohol) is a polyhydroxylated polymer with excellent performance and extensive usage.Because of its good compatibility, film-forming property,fiberizability,cohesiveness and outstanding mechanical properties,PVA is applied widely in the fields of fiber, membrane,adhesive and biomaterials.Especially,it popular used as concrete reinforced material in the recent years.Meanwhile superfine barium sulfate powder is a white mineral with mean particle diameter between 10～100μm.It is always used as filler applied in paint,rubber and medical imaging owning to its excellent optical property,dispersivity, adsorption ability and photostability.Superfine barium sulfate is ideal materials for functionalization and reinforcement of polymer matrix theoretically. In this paper,structure and properties of BaSO₄/PVA composite fiber were studied.In order to improve the imaging property,a series amount of BaSO₄ was employed.The rheological property of the blend and the crystallization behavior,structure and properties of the composite fibers were also investigated.The conclusions are as the follows:1.The dynamic rheological behavior measurement of BaSO₄/PVA blend system showed that the blend system with 60wt%BaSO₄ presents the best comprehensive properties:when the temperature is 60℃,the system has high storage modulus,high loss modulus,low loss tangent and activation energy.2.The non-isothermal crystallization kinetics and crystallization characterization of the composite fiber showed that the addition of BaSO₄ particles made the crystal structure complicated,the crystal dimension changed.The crystallinity of the composite fiber was decreased with the increase of BaSO₄ content.3.Structure and morphology of BaSO₄/PVA fibers demonstrated that phase transition happened inner the blend system when the BaSO₄ content up to 50wt%;The mechanical properties of the fibers was influenced by the addition of BaSO₄ particles,However,it also can meet the requirements as concrete reinforcement.The imaging property of the composite fiber is improved when BaSO₄ content increasing.The fiber has outstanding imaging property when BaSO₄ content up to 40wt%.And it can be used as a functional material applied in related field.