Phenyl hepta cyclopentyl – polyhedral oligomeric silsesquioxane (ph,hcp-POSS)/Polystyrene (PS) nanocomposites: the influence of substituents in the phenyl group on the thermal stability

A Rapid One-Pot Synthesis of Novel High-Purity Methacrylic Phosphonic Acid (PA)-Based Polyhedral Oligomeric Silsesquioxane (POSS) Frameworks via Thiol-Ene Click Reaction

“…It shows a sharp signal at 1.6 ppm, which arises due to the diacid form of the phosphonate units in POSS-S-PA. From the 29 Si NMR spectrum of Figure 3a, two signals are exhibited in the T 3 region, which confirms the presence of the POSS cage structure. The main signals are observed from −66.10 to −66.38 ppm and from −66.40 to −66.70 ppm and assigned to the cage-like octamer (T 8 ) and the cage-like decamer (T 10 ), respectively.…”

“…The main signals are observed from −66.10 to −66.38 ppm and from −66.40 to −66.70 ppm and assigned to the cage-like octamer (T 8 ) and the cage-like decamer (T 10 ), respectively. Moreover, the absence of a silanol group signal in the 29 Si NMR spectrum of POSS-S-PA confirms the stable SQ cage structure without any degradation during the course of reaction.…”

“…Figure 3b represents the attenuated total reflection (ATR)-FT-IR spectra of POSS-SH and POSS-S-PA hybrids. The observed peaks are at 1100-1080 and 2626 cm −1 attributed to characteristic Si-O-Si stretching and S-H stretching vibrations of POSS-SH, respectively [29,30]. The thiol-ene click reaction formed POSS-S-PA is confirmed by the presence of C=O, C-H stretching and P-OH peaks are at 1732, 2850-3050, and 3600 cm −1 , respectively, as well as the absence of an S-H peak in the region of 2620 cm −1 .…”

Synthesis and Thermal Behaviour of Novel Aliphatic/Aromatic Hepta-Cyclopentyl Bridged Polyhedral Oligomeric Silsesquioxanes (POSSs)/Polystyrene (PS) Nanocomposites

“…Many literature data indicate that the introduction of nanosized POSSs into polymers gives rise to nanocomposites showing better thermal properties than virgin polymers [20,21] and that the nature and number of the organic substituents attached to a silicon-oxygen cage largely affect not only the characteristics of POSSs [22,23], but also those of the systems prepared with them. Due to the relevant and increasing technological importance of POSSs, our group has planned and has in progress a wide research on the synthesis and the characterization of novel variously substituted POSSs with high resistance to thermal degradation, coupled with sufficiently good compatibility and solubility in polymer matrix [24,25], that can be used in the preparation of thermally stable polystyrene (PS) based nanocomposites [26,27]. High thermal stability is requested for these compounds because they can be subjected to high temperatures during processing or in service [28].…”

On a novel method to synthesize POSS-based hybrids: An example of the preparation of TPU based system

“…The size of the pendant POSS cage is comparable to the dimensions of the linear polymer, enabling POSS to control the motions of the chains at the molecular level with enhanced benefits while retaining the processability and mechanical properties of the pristine polymer [1]. From a general point of view, the incorporation of the thermally robust POSS moiety into organic polymers was found to modify drastically the thermal properties of the polymer supplying improved thermal stability to the polymer matrix [4,5], also allowing the tailoring of the polymer glass transition temperature by tuning the POSS concentration [6]. Moreover, incorporation of POSS molecules is responsible for modifications of the mechanical properties [7,8] as well as reduction in both flammability and rate of heat release during combustion [9].…”