Synthesis of multicore phenol formaldehyde microcapsules and their application in polyurethane paint formulation for self-healing anticorrosive coating

Abstract

Homo-and copolymers of 2-(N-phthalimido)ethyl methacrylate (NPEMA) and p-chlorophenyl methacrylate (PCPMA) were prepared in N,N-dimethyl formamide (DMF) solution at 70 °C using 2,2-azo-bisisobutyronitrile (AIBN) as initiator. The nano-CdS-doped polymer composite of NPEMA and PCPMA was prepared via in situ technique. The homo-and copolymers of NPEMA and PCPMA were characterized using FT-IR spectroscopy and gel permeation chromatography (GPC). The polymer nano composites were characterized using FT-IR spectroscopy, X-ray diffraction, and transmission electron microscopy. The reactivity ratios (r 1 and r 2 ) were obtained from the various linear graphical methods. The values of r 1 (NPEMA) = 0.55 and r 2 (PCPMA) = 1.30 were found from the same graphical methods. The copolymer microstructures were found from the mean sequence length, run number, and dyad fraction. Thermal behavior of polymers and polymer nano composites under nitrogen atmosphere was studied. The activation energies of neat polymers were varied in the range of 56-85 kJ/mol, while 28-56 kJ/mol energies were found for nano-CdS-doped polymer composites. The thermodynamic parameters of thermal degradation were also obtained. Kinetic and thermodynamic parameters were confirming the stability of the neat polymers than polymer nano composites. The polymers were assessed on different microorganisms for obtaining the antimicrobial properties. Overall, the polymers permit 10-52, 20-58, and 18-56% growth of bacteria, fungi, and yeast, respectively.

Experimental investigation on self-activated healing performance of thermosetting polyurethane prepared by tungsten (VI) chloride catalyst

“…Li et al [22] investigated mechanical performance and self-healing achieved by the induction of microwaves in thermoplastic polyurethane composites reinforced by Graphene-CNT. Jadhav et al [23] created microcapsules with phenol-formaldehyde resin shells and kernels containing drying and corrosion resistant agents and linseed oil. They observed that the roughness and toughness of the shell surface to provide better compatibility with the polymer matrix.…”

Polyurethanes as self-healing materials

“…Recent works offer effective self-healing systems with linseed oil as healing agent 7,8 . Jadhav et al 7 created microcapsules with shell made from phenol-formaldehyde resin and core containing drier and corrosion inhibitor along the mentioned above oil.…”

“…Jadhav et al 7 created microcapsules with shell made from phenol-formaldehyde resin and core containing drier and corrosion inhibitor along the mentioned above oil. They noticed that roughness or toughness of shell surface provides better compatibility with polymer matrix 7 . Tatiya et al created polyurea microcapsules made from polyamidoamine dendrimer of zero generation.…”

Functionalized thermal spray coatings

“…Most of them are based on existing concepts in different coatings obtained with other techniques. Self-healing materials have been largely investigated for restoring the initial barrier properties of the coating, hence protecting the metallic surface against corrosion (Jadhav et al, 2013). The presence of dyes in the coating that can be released when the coating is damaged reveals visually those impacted areas and thus makes them accessible to repair processes leading to reduced maintenance costs and longer life span of the components.…”