Synthesis and properties of styrene–butylacrylate emulsion copolymers modified by silane compounds

Abstract

Styrene (St)/butyl acrylate (BA) copolymers were prepared by adding triethoxyvinylsilane (TEVS), trimethoxyvinylsilane (TMVS), and triphenylvinylsilane (TPVS), each one through emulsion copolymerization. The polymerization was performed with methacrylic acid and auxiliary agents at 80 C in the presence of potassium peroxodisulfate as the initiator. Nonylphenol ethylene oxide-40 units (NP-40) and sodium lauryl sulfoacetate were used as nonionic and anionic emulsifiers, respectively. The resulting copolymers were characterized by using Fourier transform infrared spectroscopy. Thermal properties of the copolymers were studied by using thermogravimetric analysis and differential scanning calorimetry. The morphology of copolymers was also investigated by optical microscopy, and then the effects of silicone kinds and concentrations on the properties of the St/BA emulsion copolymers were discussed. The obtained copolymers have high solid content (50 %) and can be used in emulsion paints as a binder. The comparison of three different vinyl silanes indicates that the TEVS influences on the copolymer properties more than the others. The calculations of monomer conversion and monomer conversion versus time histories indicate that by increasing the silicone concentration, the polymerization rate decreases.

Structural, thermal and morphological properties of aqueous hybrid emulsion of silylated poly (urethane)/organic modified montmorillonite nanocomposites based on a new silicone and imide ring containing vinylic macromonomer

“…However, the extent of its in corporation in the polymer chain has not measured. The experimental results show that the reaction rate decreases by increasing TMSETMIM and the same results were obtained for the other silane compounds [38][39][40][41][42]. It is known that the rates of propagation and consequently copolymerization in a radical copoly merization reaction are inversely related to the termi nation rate constant.…”

Mechanical, water uptake properties, and biodegradability of polystyrene‐coated sisal fiber‐reinforced high‐density polyethylene

“…The results represented in Figure C showed that the elastic modulus increased linearly as the percentage of sisal fibers increased within the composites. As the interfacial adhesion between fiber and polymer is improved, the transfer of stiffness from more stiff fiber to less stiff polymeric matrix increases as indicated from the higher elastic modulus value recorded for the 20HCFb composite …”

“…[32,33] The Si O Si asymmetric stretching vibration in the range of 1000 to 1100 cm −1 is characteristic of VTMS. [34] Figure 2B shows the FTIR spectra analysis of UF and CF. The peak at 3350.1 cm −1 corresponds to the stretching vibration of cellulosic OH groups.…”

“…As the interfacial adhesion between fiber and polymer is improved, the transfer of stiffness from more stiff fiber to less stiff polymeric matrix increases as indicated from the higher elastic modulus value recorded for the 20HCFb composite. [10,37]…”

Water Resistance and Thermal Properties of Resin Based on Silane-modified Vinyl Acetate-Acrylic Emulsion Copolymers

“…Addition of silane compounds in acrylic emulsion provides beneficial effects by improving various mechanical properties, such as water, weather ability, good acid, and alkali resistance. [13][14][15][16][17][18] In addition to this, the incorporation of silicone plays the roles of coupling agent and softener 19 and it is enriched on surface of the film. 20 On the other hand You et al 21 demonstrated that silanes can be bonded with hydroxyl groups on the surface of substrate to increase the adhesion and also FTIR analysis indicated that organic functional silanes can be polymerized with other monomers.…”