Synthesis Of Poly Butyl Acrylate/Starch Ipterpenetrating Polymer Networks Filled With Inorganic Powder

Interpenetrating polymer network (IPN) is an important mothod to modify the copolymer and improve the compatibility of polymer blends. In this paper, the blending sistem of poly-butyl acrylate (PBA)) and starch filled with a certain amount of inorganic powder were synthesized by IPN technology and a series properties of blends were tested.The poly-butyl acrylate was synthesized through emulsion polymerization. The polymer was modified by acrylic acid and the most suitable content of acrylic acid was determined through testing the latex and comparative analysis. Afterwards, the polyester contained 10%AA was blended with starch and three kinds of fillers. The mechanical properties, rheological properties, thermal stability and morphology were evaluted and the effects of various factors such as A A content, starch content and filler content were studied. The main results are summarized as follows:1. The acrylic acid act as a good modification. The latex become more stable and have the higher solid content. Besides, the latex have very good mechanical stability and ion stability.2. The water absorption ratio of the materials come to 40% quickly in 10 hours because they contain hydrophilic substances such as acrylic acid and starch. The power of water absorption vary with the species of fillers. In general, the bentonite enhance the power of water absorption greatly. On the contrary, the talcum powder and calcium carbonate can attenuate the water absorption of the material.3. Mechanical properties of polyester became better when it was modified by acrylic acid. The content of starch must not exceed 25%, or the film became stiff and crisp. The talculm powder and calcium carbonate can improve the mechanical properties of the films but the bentonite can not.4. Using rotating viscometer to obtain the rheological properties:the non-Newtonian index of the blend melts are all less than one. The blends melts are all sheering thinning and pseudoplastic fluid.5. The TEM micrographs shows that the compatibility of polyester and starch blends is improved differently. As a whole, the effect of talcum powder is best and lead to a better dispersion and homogeneity of starch in the polyester matrix.6. From the testing results of DSC and TG, the thermal stability of materials filled with inorganic has been improved.