TAILIEUCHUNG - Study on the rhelogical, physico mechanical and thermal properties of polyvinylchloride/ wasteg - ypsum polymer composites
In this research, we mainly present the effect of modified waste-gypsum (MWG) contents on the rheological, physico-mechanical and thermal properties of the PVC/MWG polymeric composite materials. Four kinds of rigid PVC/MWG composite with different MWG contents were prepared by melt blending method. The morphological development of the PVC/MWG polymeric composite samples is also discussed in this paper. | TẠP CHÍ KHOA HỌC VÀ CÔNG NGHỆ Tập 48, số 2, 2010 Tr. 99-107 STUDY ON THE RHELOGICAL, PHYSICO-MECHANICAL AND THERMAL PROPERTIES OF POLYVINYLCHLORIDE/WASTEGYPSUM POLYMER COMPOSITES NGUYEN VU GIANG 1. INTRODUCTION Among the commercial polymeric materials, polyvinylchloride (PVC) is a common polymer material that has been widely used for producing industrial goods and household implements as well. Addition to the advantages such as high Young’s modulus, high tensile strength, high optical stability, good weathering durability, compatible with plasticizer, fire resistance and so on, PVC also has some drawbacks such as: brittleness, low thermal stability, difficult processing . Due to its inherent disadvantages, PVC is subjected to some limitations in certain applications [1, 2]. In fact, the PVC products are usually the combination of PVC resin and some important additives during processing like thermal stabilizers, processing aids, plasticizers, inorganic reinforcement materials to improve their properties and enlarge their applications. Generally, in the commercial PVC compounds, the inorganic materials play a role as fillers, take the high contents and strongly affect to the nature and the structure of the products and reduce the costs, the common fillers such as CaCO3, talc, carbon black, ZnO [3]. This research has mentioned about a potential inorganic materials, waste-gypsum powder that can be used as filler in the PVC matrix. Table 1. Chemical compositions of waste-gypsum (wt.%) Components Average contents Standard contents Minimum contents Maximum contents Phosphate Soluble phosphate CaO CaSO4 Gypsum is a by-product of the production of phosphoric acid. The wet phosphoric acid obtained by dissolving phosphate ore into sulfuric acid in an artificial way, Namhae Chemical Company has been achived the wet .
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