Synthesis of silica-polymer core-shell hybrid materials with enhanced mechanical properties using a new bifunctional silane-based photoinitiator as coupling agent

Abstract

Here, we report the use of new bifunctional silane-based type-1 photoinitiator (SPI-1) as a coupling agent for photopolymer filler and silica grafting. The SPI-1 is grafted on the surface of silica nanoparticles via interactions between the ethoxy group of the silane and the silanol groups of the silica surface. The grafted particles are then dispersed or embedded in/with acrylate polymer by a direct photopolymerization process. The materials were characterized using different techniques including UV-visible spectroscopy, FTIR, TGA, and TEM. Their mechanical properties and the surface morphology were also investigated using AFM and DMA analyses. A significant change and enhancement of the mechanical properties of the newly synthesized materials were observed with respect to that of the unmodified silica. The analysis of the morphology at the microscale level reveals interesting information on the origin of this enhancement and on the dispersion of the filler in the polymer matrix.

Visible-Light-Sensitive Triazine-Coated Silica Nanoparticles: A Dual Role Approach to Polymer Nanocomposite Materials with Enhanced Properties

“…In both samples, the weight loss observed below 100 °C was attributed to the release of water from silanol groups. 38 The additional weight loss in Sitriazine NPs was attributed to the thermal degradation of silylated triazine. Since the water and silanol contents in both samples were similar, 38 the coating amount was estimated to be 13 wt %, corresponding to 0.19 mmol of silylated triazine per 1 g of Si-triazine NPs.…”

“…38 The additional weight loss in Sitriazine NPs was attributed to the thermal degradation of silylated triazine. Since the water and silanol contents in both samples were similar, 38 the coating amount was estimated to be 13 wt %, corresponding to 0.19 mmol of silylated triazine per 1 g of Si-triazine NPs. The coating amount was doubly confirmed with UV−vis measurements.…”

Multifunctional benzoin derivatives based macrophotoinitiators: Synthesis, inorganic fillers modification, and fabrication of composite materials

“…Great progress has been achieved in recent years with the development of ever more efficient MPIs, for photopolymerization 60–62 . UV‐curable formulations can also include a considerable quantity of mineral fillers introduced for improving strength and abrasive resistance of cured compositions 63 . In predominant cases, the physico‐mechanical properties of composite materials essentially depend on interfacial interactions of filler with polymer matrix.…”

“…[60][61][62] UV-curable formulations can also include a considerable quantity of mineral fillers introduced for improving strength and abrasive resistance of cured compositions. 63 In predominant cases, the physico-mechanical properties of composite materials essentially depend on interfacial interactions of filler with polymer matrix. A prosperous way to improve interfacial interactions is a surface modification of mineral fillers by compounds capable of chemical interaction with a matrix polymer.…”

Synthesis and Characterization of a Trifunctional Photoinitiator Based on Two Commercial Photoinitiators with α-Hydroxyl Ketone Structure

“…To overcome these disadvantages of yellowing and migration, some larger molecular weight photoinitiators have been explored [ 25 , 26 , 27 , 28 , 29 , 30 ]. Some researchers have prepared two or more functional photoinitiators for improving some properties of UV cured films [ 31 , 32 ].…”