INVESTIGATION OF POLYACRYLIC ACID BASED TERPOLYMER COATINGS

Abstract

In the current piece of work, Polyacrylic acid based terpolymers; Acrylic acid-Styrene-Maleic anhydride (ASM); were synthesized with different percentage by weight of Styrene and Maleic anhydride viz. ASM52 (5 % styrene, 2% maleic anhydride), ASM102 (10 % styrene, 2% maleic anhydride), ASM73 (7 % styrene, 3% maleic anhydride) and ASM74 (7 % styrene, 4% maleic anhydride) following bulk polymerization. The composites of ASM73 and ASM74 (ASM73 C and ASM74 C) were also developed using TiO2-Al2O3. The samples were characterized using Fourier transform infrared (FTIR) spectroscopy (for functional groups and to confirm the chemical interaction between TiO2-Al2O3 and organic moiety) and Energy Dispersive x-ray Spectroscopy (EDS) for elemental analysis. Thermal analysis revealed that no physical or chemical changes took place upto130o C in ASM73 C and 138o C in ASM74 C. The samples were investigated to evaluate their potentiality as coating material for glass. Thus, mechanical properties of terpolymer coated glass (ASM52-G , ASM102-G, ASM73-G and ASM74-G) and composite coated glass (ASM73 C-G and ASM74 C-G) ; in terms of flexural and Izod impact strength; was determined and compared with that of the normal glass and Poly Acrylic Acid coated glass(PAA-G). ASM73 C-G and ASM74 C-G were found to have unexpectedly high flexural strengths (146.20 and 136.01 MPa respectively) as compared to uncoated glass (68.75MPa), PAA-G (85.96 MPa) and glass coated with different samples of terpolymers synthesized during current investigation. Similarly the impact strengths of ASM73 C-G and ASM74 C-G; 43.33 and 40 j/m respectively; are remarkably higher than that of glass (22.85 j/m) and PAA-G (26.66 j/m). Surface morphology of the coatings was studied by using Scanning electron microscopy (SEM). It was observed that the mechanical strength of ASM73C-G and ASM74 C-G are comparable but ASM74 C-G possesses better clarity thus can be used where transparency is highly desirable. Also the coatings prevented the broken glass pieces from shattering which makes the glass safer for indoor applications.