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Tourmaline was modified with vinyl triethoxysilane containing double bond to prepare the polymerizable organic vinylsiliconoxyl tourmaline (VST) and then copolymerized with methyl methacrylate (MMA) and butyl acrylate (BA) to produce the tourmaline-containing functional copolymer p (VST/MMA/BA). The structures and morphologies of VST and p (VST/MMA/BA) copolymer were characterized by IR, SEM, and EDX. The experimental results indicated that tourmaline was introduced into the copolymer via surface modification and the tourmaline-containing functional copolymer was obtained by a copolymerization process with MMA and BA. The prepared p (VST/MMA/BA) copolymer displayed excellent storage stabilities, high far-infrared radiation and negative ion releasing performances, and good mechanical properties.

The surface modification of tourmaline powder with methacrylic anhydride was studied in this work, and the reaction process conditions were optimized according to the experimental parameters of contact angle and turbidity in liquid paraffin. The structure of the modified tourmaline was characterized by means of IR, XRD and SEM. The structural analysis indicated that methacrylic group was attached onto the surface of tourmaline by the reaction of tourmaline with methacrylic anhydride to get a polymerizable tourmaline methacrylate. The experimental results indicated that modified tourmaline presented enhanced hydrophobicity than the unmodified tourmaline.

Abstract. Starch/lactic acid graft copolymer was attempted in situ grafting reaction of lactic grafting starch via the catalysis of hydrochloric acid. The graft copolymers of Starch and PLA had been synthesized and characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction(XRD), and scanning electron microscopy(SEM). The synthetic condition were optimized that the weight ratios of starch with lactic acid were 1:2 when reacted for 3 hrs at 90 °C in 0.6 mol/L hydrochloric acid solution. The starch-g-lactic acid copolymer can be finally obtained with graft degree of starch 65%.