2017
DOI: 10.1039/c7ra08152a
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The effect of size and concentration of nanoparticles on the glass transition temperature of polymer nanocomposites

Abstract: Here we use model nanocomposites based on polystyrene and polyphenylene dendrimers to show both theoretically and experimentally that inclusion of rigid nanoparticles of 2.3–5 nm size into the polymer leads to a negligible glass transition temperature (Tg) increase.

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Cited by 36 publications
(23 citation statements)
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“…The intensity of these emissions is falling off and they also showed a blueshift as Ga content in the sample is increasing. The other emissions in visible region, defect level emissions, are resulting from charge carriers recombination in the defect levels within the band gap [ 42 ]. These emissions appeared over a wide visible region ranging from 530 to 640 nm, namely green, yellow, and orange-red emissions with clear weaker intensities than near band emissions as shown in Figure 6 .…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…The intensity of these emissions is falling off and they also showed a blueshift as Ga content in the sample is increasing. The other emissions in visible region, defect level emissions, are resulting from charge carriers recombination in the defect levels within the band gap [ 42 ]. These emissions appeared over a wide visible region ranging from 530 to 640 nm, namely green, yellow, and orange-red emissions with clear weaker intensities than near band emissions as shown in Figure 6 .…”
Section: Resultsmentioning
confidence: 99%
“…These emissions appeared over a wide visible region ranging from 530 to 640 nm, namely green, yellow, and orange-red emissions with clear weaker intensities than near band emissions as shown in Figure 6 . The visible region emissions could be resulted from large varieties of defects since the defect formation as well as defect concentration in Ga doped ZnO are very complex [ 35 , 42 ]. The relative intensities of near band peaks to that of the defect levels are decreasing with Ga concentration in the samples, which means the electron–hole recombination occurs in the deep defect states rather than near band states [ 35 ].…”
Section: Resultsmentioning
confidence: 99%
“…In fact, T g values did not show a unique trend with increasing of the ZnO nanofiller in the polymer nanocomposites. This is due to the competition of many factors which affects the degree of freedom of the polymer chains [ 37 ]. In most cases of nanocomposites, there are two main competitive factors.…”
Section: Resultsmentioning
confidence: 99%
“…Figure presents the T g of PC and PC/SiO 2 nanocomposites for different nanofiller sizes and concentrations. It has been noted that the T g of PC gradually increases with increasing nano‐SiO 2 contents, due to the higher degree of filler–matrix interaction and the restriction of polymer chain movement caused by the nanoparticles . However, the T g is not significantly affected by the size of the nano‐SiO 2 particles.…”
Section: Resultsmentioning
confidence: 99%
“…Apart from mechanical properties, a degree of filler–matrix interaction also plays a significant role in thermal properties of polymer nanocomposites, particularly in T g for amorphous polymers. An appropriate filler–matrix interaction tends to increase the T g of the polymer resulting in an increase in the temperature range of material usage …”
Section: Introductionmentioning
confidence: 99%