Enhancing Mechanical Properties of Graft-Type Nanocomposites Using Organically Modified SiO2 and Polypropylene Containing Reactive Methoxy Groups

Abstract

In situ grafting of a reactive matrix and nanofillers is a promising strategy to fabricate graft-type polypropylene (PP)-based nanocomposites, where the grafting efficiency is affected by the initial dispersion of nanofillers in the matrix. In this work, influences of surface organic modification of nanofillers were investigated on properties of PP/SiO2 nanocomposites using poly(propylene-co-octenyltrimethoxysilane) as a reactive matrix. The surface modification of SiO2, especially with longer alkyl chains, led to improved dispersion of nanoparticles, thus promoting the grafting reaction and mechanical properties. The combination of in situ grafting and surface modification of nanofillers provided several benefits, most notably in balancing the strength and the toughness, which could not be achieved by the grafting alone.

High Permeance Polyamide Nanofiltration Membranes Based on Poly(l-lactic acid) Electrospun Nanofibrous Membranes with Controlled Hydrophilicity

“…Therefore, it is difficult to directly form a dense and defect-free PA layer on such a substrate. There are various methods to hydrophilize the substrates, such as surface coating, chemical grafting, and layer-by-layer assembly. − The introduction of hydrophilic additives during the electrospinning process is a convenient and effective method of fabricating hydrophilic membranes. The hydrophilicity can be controlled by the contents of the additives.…”

Nanotechnology in the Fabrication of Advanced Paints and Coatings: Dispersion and Stabilization Mechanisms for Enhanced Performance

“…The grafted silane molar percentage (Ms %) on NMs can be calculated as follows Equation ( 2): [123] Where Mw silane and Mw NMs are the molecular weight of silane and NMs, respectively, ~m is the weight loss from the TGA in specific temperature range, r a/s the molecular weight ratio of the alkyl chain versus the whole silane molecule. By having Ms (%) and using following Equation (3), we can obtain Grafting density: [123,124] D. Zhu et al reported the surface modification of SiO 2 using different silanes (Trichlorohexylsilane, trichlorododecylsilane, and trichloro-hexadecylsilane) with alkyl chain lengths of C6, C12, and C16, respectively. [124] The results indicated that at a fixed mole of silane coupling agents (0.1 mmol), the grafting density decreased with an increase in the alkyl chain length.…”

“…By having Ms (%) and using following Equation (3), we can obtain Grafting density: [123,124] D. Zhu et al reported the surface modification of SiO 2 using different silanes (Trichlorohexylsilane, trichlorododecylsilane, and trichloro-hexadecylsilane) with alkyl chain lengths of C6, C12, and C16, respectively. [124] The results indicated that at a fixed mole of silane coupling agents (0.1 mmol), the grafting density decreased with an increase in the alkyl chain length. It is considered that the adsorption and reaction of a molecule of a bulky silane-coupling agent inhibit the approach of a new molecule to the surrounding silanols.…”

Interface Engineering of Microporous Polypropylene Membranes for Polyamide Thin-Film Composite Nanofiltration Membranes with Robust Structure and Superior Performance

“…Therefore, it is an issue to synthesize uniform and integral polyamide layers on hydrophobic substrates via interfacial polymerization. To overcome this obstacle, researchers have developed various surface modification methods to hydrophilize the substrates, such as surface coating, − vapor deposition, plasma treatment, , chemical treatment, grafting, and layer-by-layer assembly. , Among these methods, some are limited by the complex operational process, specific devices, or high energy-consumption. Surface coating has been considered as a promising strategy for the characteristics such as simplicity, conformal modification, and easy to large-scale fabrication.…”