کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5184594 | 1381052 | 2010 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Studies on syntheses and morphology characteristic of chiral novel poly(ester-imide)/TiO2 bionanocomposites derived from l-phenylalanine based diacid Studies on syntheses and morphology characteristic of chiral novel poly(ester-imide)/TiO2 bionanocomposites derived from l-phenylalanine based diacid](/preview/png/5184594.png)
In this study, a new optically active poly(ester-imide) (PEI) was synthesized from the polymerization reaction of N,Nâ²-(pyromellitoyl)-bis-l-phenylalanine diacid with 4,4â²-thiobis(2-tert-butyl-5-methylphenol) using tosyl chloride, pyridine and N,N-dimethyl formamide as a condensing agent. The obtained polymer and inorganic metal oxide bionanocomposites composed of poly(ester-imide)/titanium dioxide were synthesized through ultrasonic irradiation. The formation of PEI was confirmed by 1H NMR, fourier transform IR spectroscopy (FT-IR), specific rotation and elemental analysis. The resulting bionanocomposites were characterized by FT-IR, powder X-ray diffraction (XRD), atomic force microscopy)AFM(, scanning electron microscopy (SEM), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and thermogravimetric analysis (TGA). The TEM, SEM and FE-SEM results indicated that the nanoparticles were dispersed homogeneously in PEI matrix on nanoscale. TGA confirmed that the heat stability of the nanocomposite was improved in the presence of TiO2 nanoparticles.
Journal: Polymer - Volume 51, Issue 23, 29 October 2010, Pages 5369-5376