“Anchor effect” in poly(styrene maleic anhydride)/TiO2 nanocomposites

摘要: Multi-component composites or hybrid materials of inorganic matter and organic polymers have been reported recently [1–3]. It is well known that styrene maleic anhydride usually copolymerize in an alternating way, resulting a poly(styrene anhydride) (PSMA) copolymer with highly regular groups on backbone chains which may provide sites for combination other substances. Nanocomposites matrices are particular interest, combine typical properties (e.g., elasticity, transparency specific absorption light, dielectric properties) the advantages nanoparticles, particularly, high surface ratio atoms to innersphere atoms. Among nanostructured investigated, nanometer-sized TiO2 particles technologically important many applications, greatly increases their activity as catalyst sensitivity sensor [4, 5]. However, serious problem its aggregation varied ambient conditions. In this paper, we report synthesis PSMA/TiO2 nanocomposites via multi-component solution. The PSMA can functional groups, anchor prevent them from aggregating. gives 1 : structure consisting anhydride, shown Fig. [6]. was dissolved THF (tetrahydrofuran) stirring at 40 ◦C 12 h, then acacH (acetylacetone) deionized water (mol 25) were dropped into polymer used reduce hydrolyzing rate Ti(OBu-n)4 (tetrabutyl titanate). pH value mixture adjusted about 1.7 concentrated hydrochloric acid (37%). After 20 min, precursor mixture. that, reactant heated 60 ◦C, stirred temperature 4 h. Finally, homogeneous sealed baking oven kept room days. Several punctures made sealing adhesive tape pin volatilize flowing air, thus orange-red optically transparent samples obtained. dried under vacuum 80 2 FT-IR spectra indicate existence absorbed gave rise band [7] 1620 cm−1, especially, broad around 3500 cm−1. IR spectrum (Fig. 2a) shows adsorption bands 1858 1778 cm−1 characteristic [8], attributed asymmetrical symmetrical νC=O (C=O stretching vibration) moiety [9], respectively. peaks 1600, 1500 1450 νC=C phenyl group chain [9, 10]. 1214 νC–O–C units, five-numbered cyclo-anhydride 1310∼1210 wavenumber [7]. 700 δC=C (C=C bending [10], internal reference offset differences thickness samples. pure 2b) strong peak between 650 400 accounted by vibrations Ti–O–Ti [11], regarded [12]. information both