New mechanochemical effects in the poly(N-vinylcaprolactam)—Nano-titanium oxides(IV) system

Abstract

Abstract

The impact of intense types of effects on poly(N‐vinyl caprolactam) and composites in the system nanoscale anatase – poly(N‐vinyl caprolactam)

“…A substantial decrease in intensity of the 2nd peak of PVCL is revealed in the diffraction pattern of PVCL25‐P(AEF) compared to the 1st peak [Figure 2(e)] almost up to its complete disappearance for NA/PVCL25‐P(AEF) [Figure 1(i)] (effect 2–3). A similar diffraction pattern was recorded for PVCL40 in the composition of NA/PVCL40A nanocomposite subjected to mechanical grinding in a planetary ball mill (RETSCH PM200, 100 rpm, 10 min, Ar) 35 …”

“…The MWT impact on NA/PVCL40‐P powder‐like nanocomposite [Figure 1(d)] leads to broadening of the 1st PVCL peak in the diffraction pattern of NA/PVCL40‐P(MWT) with the signs of possible splitting into two peaks [the dashed line in Figure 1(g)–(i)] with somewhat different intensities and to the shift of the maximum of the 2nd peak of PVCL toward large angles [red line in Figure 1(c); effect 2–1; Figure 1(h), Table 2], which corresponds to the behavior of the same peaks in the X‐ray diffraction pattern of the PVCL40‐F(MWT) film [Figure 1(b)]. We fixed a decrease in the average size of NA crystallites in NA/PVCL40‐P(MWT) ( D = 70 Å) compared to the initial Hombifine N ( D = 83[4] Å), 35 caused by amorphization of anatase nanoparticles.…”

“…Then, the fims were mechanically ground into finely dispersed powder PVCL40‐P in a porcelain mortar. Also, for the comparison we used the PVCL40 sample (denoted as PVCL40A), purified by thermal precipitation at higher temperatures (60°С–70°С) (see experimental procedure in 35 ).…”

“…Nanocomposites powder NA/PVCL40‐P was prepared by mixing of NA and PVCL40‐P powders in a weight ratio PVCL: NA = 2: 1 with subsequent mechanical grinding in an porcelain mortar 35 …”

“…Differential scanning calorimetry (DSC) of films and powders was performed using a Netzsch DSC 204 device (Phoenix, Germany) according to the procedure described in publication 35 . For PVCL40‐P and PVCL40‐P(MWT) samples the scanning was performed in a temperature range from −60°C to 600°C in 2 cycles: heating to 230°C (cycle 1) and repeated heating to 600°C (cycle 2).…”