سال انتشار: ۱۳۸۷

محل انتشار: دومین کنگره بین المللی علوم و فناوری نانو

تعداد صفحات: ۲

نویسنده(ها):

M Abbasian – Payame Noor University of Tabriz, Tabriz-Iran
M Ghadami –
S Esmaeily Shoja – Islamic Azad University, Bonab branch, Bonab-Iran
M Adeli – Khorram Abad University, Khorram Abad –Iran

چکیده:

Poly(vinyl chloride) (PVC) is an extensively used thermoplastic material because of its flame retardance, high chemical resistance, and good performance in respect of mechanical behavior as well as low price. The successful application of clay, especially montmorillonite (MMT), in the preparation of polymer nanocomposite with excellent properties opens a novel approach to improve the performance of PVC. Wang et al. prepared PVC/clay nanocomposites by melt blending of the polymer with an organically modified clay, both in the presence and absence of di(2-ethylhexyl) phthalate (DOP) plasticizer, and found that the tensile strength of the nanocomposite increased as the fraction of clay increased. Yalcin and Cakmak also prepared PVC/clay nanocomposite by melt blending, and found that DOP plasticizer would help the exfoliation and dispersion of clay particles when DOP fraction was suitable. Wan et al. found that the partially intercalated and partially exfoliated MMT/PVC nanocomposite could be obtained by melt blending of PVC with alkyl quaternary ammonium modified MMT. The nanocomposites showed better mechanical properties than pristine PVC. However, the nanocomposites were easy to discolor during processing due to the decomposition of alkyl quaternary ammonium. Gong et al. reported the synthesis and thermal properties of PVC/MMT nanocomposites via in situ intercalative polymerization process. They also confirmed that the presence of the quaternary ammonium in the nanocomposites was responsible for the accelerated degradation of PVC in the initial stage [1,2]. According these methods, we synthesized Poly vinyl chloride/ montmorillonite nanocomposites. In this study, First, graft copolymerization of PVC with monomers such as styrene has been examined to improve the thermal stability of PVC. This graft copolymerization was prepared by atom transfer radical polymerization (ATRP). In these method PVC condensed with toluene in mild condition and brominated with NBS, was used as a macroinitiator. The formation of the graft copolymer was confirmed with GPC, DSC, 1HNMR and FT-IR spectroscopysynthesizes [3,4]. Then, modified Poly vinyl chloride/ montmorillonite nanocomposites was synthesized