Polymer Engineering Department, Faculty of Chemical Engineering, Tarbiat Modares University, PO Box 14115-114, Tehran, IranResearch subject: In recent years, many attempts have been devoted to industrial usage of biobased adhesives, as a result of fossil resources shortage and unusual increase in oil-based products prices. Adhesion s trength of this category of adhesives, however, needs improvement. Research approach: In the current s tudy, lap-shear s trength of joints made of a natural polymer, Persian gum (PG), exuded from wild almond tree, and three various substrates, glass, poly (ethylene terephthalate), and cellulose fabric, was inves tigated. Furthermore, in order to prepare powder acrylic adhesive and evaluate its adhesion to afore

The polymerization-induced biphasic nature of an emulsion 30/70?wt.% methyl methacrylate (MMA)/butyl acrylate (BA) copolymer was deeply scrutinized with different techniques as the MMA-rich/BA-rich copolymers blend. Its experimentally found upper critical solution temperature (UCST) was then confirmed by the Sanchez-Lacombe lattice fluid (SLLF) and compressible regular solution (CRS) models. Characterization of soft polymer nanocomposites (SPNs) from the aforementioned system as the matrix and different fractions of mono-size poly(styrene-co-acrylonitrile) soft nanoparticles made of 70?wt.% styrene (SAN70) with dynamic mechanical thermal analysis (DMTA), atomic force microscopy (AFM), and rheometry approved their multi-phase character. Homo

The tear strength of a model methyl methacrylate–butyl acrylate copolymer containing 30 wt% methyl methacrylate (MBC30) and its adhesion strength to poly(ethylene terephthalate) were determined to be 10.2 and 0.26 kN m−1, respectively. The addition of 5 wt% mono-size, 180 nm in diameter, soft nanoparticles of poly(styrene-co-acrylonitrile) with 30 wt% acrylonitrile (SAN70) through latex blending, followed by drying, amplified the adhesion strength while reducing the tear strength. Mild and harsh annealing of the nanocomposite led to partial and full deterioration of work of failure per unit volume (WoF), resulting in augmented adhesion and tear strengths followed by their severe decline, respectively. The G0(1 + ϕ) model-based partitio

Temperature-induced nonlinearity of an upper critical solution temperature (UCST) copolymer blend and its nanocomposites containing 5?wt% mono-size soft nanoparticles (SNPs) were investigated. Mechanical and thermal energies contribution into the nonlinearity of UCST copolymer blend was 8.9 ? 103?Jm−3 and 2.2 ? 103?Jmol−1, respectively. Addition of SNP did not change the system thermal-based nonlinearity, while altered its mechanical contribution at constant heating and solicitation conditions. It diminished to 0.4 ? 103?Jm−3 in the nanocomposite containing nano-size dispersion of aged SNPs. Micron-size agglomeration of the fresh SNPs in the nanocomposite; however, enhanced the required mechanical energy for

Phase separation of an all-polymer nanocomposite containing poly (methyl methacrylate-co-butyl acrylate) with 30 wt% methyl methacrylate (MBC30) as matrix and 5 wt% of mono-size poly (styrene-co-acrylonitrile) soft nanoparticle with 70 wt% styrene (SAN70) were investigated. Rheology was used to determine the binodal and spinodal phase separation temperatures based on inflection point of storage modulus and mean field theory. The measured temperature agrees very well with the DSC results.