Font Size: a A A

Study On Preparation, Characterization And Properties Of Polypropylene/Attapulgite Nanocomposites

Posted on:2005-06-06Degree:DoctorType:Dissertation
Country:ChinaCandidate:L H WangFull Text:PDF
GTID:1101360182955767Subject:Materials science
Abstract/Summary:PDF Full Text Request
In this paper, polypropylene(PP)/attapulgite(ATP) nanocomposites were prepared by melt blending, in which PP was used as polymer matrix and ATP as inorganic components. The surface modification of attapulgite was introduced in detail and the structure and properties of PP/ATP composites were mainly studied, moreover, kinetics about crystallization and thermal decomposition were also investigated. ATP was treated with four different modifier and next graft polymerization processed with butyl acrylate (BA), and the organic ATP were obtained. The structure and thermal behavior of untreated and treated ATP were investigated by FT-IR, XPS, DTA-TGA etc. and the dispersion condition were observed by means of SEM and TEM. The results showed that silane-coupling agent is better than the other modifier, and the diameter of fibrous crystal become bigger than crude ATP, but still have a few aggregations. The characterization on structure and properties of PP/ATP nanocomposites indicated that the addition of ATP didn't change the crystalline structure of PP but made the crystallinity slightly increase; the dynamic storage modulus of composites advanced but the glass transition temperature varied slightly. The results of mechanical properties showed the tensile strength was increased 6~13% and the modulus improved 15~32% while notch impact strength maximum to 70%. The studies of crystallization kinetics of PP/ATP composites indicated that isothermal and nonisothermal crystallization behaviors could be described by Avrami equation, and the Avrami exponents were between 4 and 5. So it could be concluded that the addition of ATP increased the crystallization rate and meantime the spherulite dimension were greatly decreased in size but quantity was increased. The thermal decomposition curve of PP/ATP composites showed that the initial temperature of thermal decomposition and the temperature of maximum thermo-gravimetric rate were all shifted towards high temperature. The studies of thermal decomposition kinetics indicated that the activation energy of thermal decomposition reduced compare to pure PP.
Keywords/Search Tags:Polypropylene, attapulgite, nanocomposites, surface modification, graft polymerization, crystallization kinetics, thermal decomposition
PDF Full Text Request
Related items