Effect of Polyhedral Oligomeric Silsesquioxanes Nanoparticles on Thermal and Mechanical Properties of Poly(vinyl chloride) Composite Materials

Abstract

The modification of poly(vinyl chloride) (PVC) by polyhedral silsesquioxane containing both methacryl and octyl groups (MeOctPOSS) was the task of studies. The PVC nanocomposites with MeOctPOSS concentration between 1 and 10 wt% were prepared by melt mixing processing, and the homogeneity of MeOctPOSS dispersion in the polymeric matrix was confirmed by scanning electron microscopy and energy dispersive spectroscopy observations. The influence of MeOctPOSS on glass transition temperature (Tg) determined by means of dynamic mechanical thermal analysis (DMTA) and differential scanning calorimetry (DSC) was observed, whereas, higher the measurement frequency, higher the glass transition temperature was noted. The MeOctPOSS concentration‐dependent PVC glass transition temperature was shifted from 73.8°C to about 68°C (ƒ = 1 Hz) and from 76.5°C to 70.8°C (ƒ = 10 Hz) for increasing additive content. Similar result of decreasing Tg value was observed by DSC method. An introduction of 10 wt% of MeOctPOSS into the PVC matrix results in a visible decrease of the maximum value of loss modulus (G′) of approximately 12% and 18% by 1 Hz and 10 Hz, respectively, as well as in a significant reduction of the static elastic modulus. It was stated that the polyhedral oligomeric silsesquioxanes with both methacryl and octyl groups may act as plasticizers of the PVC matrix. J. VINYL ADDIT. TECHNOL., 25:E48–E54, 2019. © 2018 Society of Plastics Engineers

Poly(vinyl chloride) Composites with Raspberry Pomace Filler

“…This effect results from reduced interactions between adjacent polymer chains induced by adding filler particles. The obtained results prove that the RRGED filler triggers slight PVC plasticisation [ 58 ]. Moreover, the DSC thermograms show an endothermic transition within the temperature range of 45 to 65 °C with a minimum at 54.5–56.1 °C.…”

Synthesis and characterization of gamma irradiated polyvinyl chloride/graphite carbon nitride nanocomposite films for electronic applications

“…In the spectra of the PVC and PVC/GN shown in Fig. 3, bands at the wave numbers of 2941 cm − 1 and 1435 cm − 1 were observed, attributed to the presence of C-H bonds in the PVC macromolecule [25,27,39]. The peak at 1255 cm − 1 corresponds to bending vibrations of the C-H originating from CHCl [39].…”

“…Polymer composites are widely used in industrial applications due to their ability to combine the desired properties of various polymeric species. In particular, polyvinyl chloride (PVC) belongs to the most frequently used materials in the creation of nanocomposites because of its bene cial properties, such as its comparatively low cost, extensively developed processing, the possibilities of modi cation of its mechanical properties, and its high environmental resistance [23][24][25][26][27].…”

Formation of Bifunctional Octasilsesquioxanes via Silylative Coupling and Cross-Metathesis Reaction

“…There are also single notes on the utilization of thiol-ene [ 37 ], hydration [ 38 , 39 ] and click type reactions [ 40 , 41 , 42 ] for the synthesis of multifunctionalized silsesquioxanes. As stated, bifunctional SQ’s derivatives, due to the presence of different functionalities in the same core, possess a high application potential, e.g., as hydrophobic materials [ 43 , 44 , 45 , 46 ], mold material for nanoimprint lithography [ 47 ], anion sensors [ 31 , 48 ], Janus star polymers [ 49 , 50 ] or platforms for anchoring and delivering biologically active compounds in biomedicine [ 51 ]. Bifunctional silsesquioxanes with a T 8 R 4 R’ 4 formula are of particular scientific interest because it was demonstrated that they can be considered to be Janus-type molecules [ 52 ].…”