Abstract
This study dealt with the properties of acrylic primer for concrete substrate using acrylic syrup, made from a methyl methacrylate monomer solution of terpolymers. Terpolymer systems consisting of methyl methacrylate (MMA), 2-ethylhexyl acrylate (2-EHA), and methacrylic acid (MAA) with different chemical composition ratios of MMA and 2-EHA were synthesized through bulk polymerization using azobisisobutyronitrile (AIBN) as initiator. The terpolymer composition is characterized by FTIR,1H NMR, DSC, TGA, and SEM. The glass transition temperature and the thermal stability increased with increasing amounts of MMA in the terpolymer backbone. The effect of chemical composition of terpolymers on physicomechanical properties of primer films was investigated. However, increasing the amount of MMA in terpolymer backbone increased tensile and contact angle of primer films while elongation at break, water absorption, and bond strength are decreased. In particular, the primer syrup containing 65% 2-EHA has good bonding strength with concrete substrate around 1.1 MPa.
Highlights
Methyl methacrylate (MMA) is an important monomer, which is widely used for producing acrylic plastics poly(methylmethacrylate) (PMMA) or producing polymer dispersions for surface coatings, adhesives, and functional additives [1,2,3,4]
The intensity of O–H stretching vibration of carboxylic groups which appeared in the range 3441– 3414 cm−1 changes with the methacrylic acid (MAA) content in the synthesized terpolymers
Thermogravimetric analysis (TGA) showed that all the terpolymers exhibited high thermal stability
Summary
Methyl methacrylate (MMA) is an important monomer, which is widely used for producing acrylic plastics poly(methylmethacrylate) (PMMA) or producing polymer dispersions for surface coatings, adhesives, and functional additives [1,2,3,4]. In order to enhance its mechanical properties, scientists have developed various methods to prepare different types of PMMA through the copolymerization of MMA monomer with various types of vinyl monomers. In this regard, Pathak et al [5] have prepared terpolymer films of poly(methyl methacrylate-co-styrene-co-acrylonitrile) and found that films are brittle, light yellow in color and the softening range of the films was found in the range 89– 119∘C. Mixing of two components is followed by dissolution of the polymer in the monomer results in the formation of plastic dough [8, 9] Along with this physical interaction, the syrup is cured by the application of self-curing type. A high level of heat is generated during the exothermic reaction [9]
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