Designing semiencapsulation based covalently self‐healable poly(methyl methacrylate) composites by Atom Transfer Radical Polymerization

Abstract

Self-healable poly(methyl methacrylate) (PMMA) composites were fabricated with embedded glycidyl methacrylate (GMA) encapsulated poly(melamine-formaldehyde) microcapsules. The matrix polymers were synthesized via Atom Transfer Radical Polymerization using two different initiators; one linear and another hexafunctional. As the so prepared polymer matrix retains living characteristics, it can initiate a healing reaction when the encapsulated monomer reaches the matrix due to formation or extension of a crack and thus healing the system covalently. The effect of number of initiating functionality on healing characteristic was studied using both linear and 6-armed star PMMA having same targeted molecular weight. Both the systems were able to restore 100% original fracture toughness after healing. However, the polymer matrix prepared by hexafunctional initiator restored the fracture toughness much faster than that of the linear polymer matrix.

Synthesis of star polymers using organocatalyzed atom transfer radical polymerization through a core-first approach

“…1,1,1-Tris(2-bromoisobutyryloxymethyl)ethane, dipentaerythritol hexakis(2-bromoisobutyrate), and tripentaerythritol octakis(2-bromoisobutyrate) were synthesized according to modified literature procedures. 38,39 PC 3,7-Di(4-biphenyl) 1-Naphthalene-10-Phenoxazine ( 1 ) was synthesized according to literature procedure. 34…”

Process regulation for encapsulating pure polyamine via integrating microfluidic T‐junction and interfacial polymerization

“…Self‐healing materials have the advantages of extending the service life, improving the safety, and reducing the maintenance cost of materials. [ 1–6 ] Attributed to this, it has been widely investigated all over the world and has great potential to be used in aircraft, automobiles, construction, military equipment, electronic device, etc. [ 7–10 ] Among all the methods to generate self‐healing materials, [ 11–13 ] self‐healing by encapsulated reactive healing agents is the most investigated direction of this field due to the ease of manufacturing microcapsules and material integrity for the matrix because of the alleviated deterioration by the inclusions.…”

Influence of Eugenol and Its Novel Methacrylated Derivative on the Polymerization Degree of Resin-Based Composites

“…However, such an absorption profile was not seen in the EgGMA spectra due to infeasible quinone generation, thus confirming the success of the etherification reaction (Figure 2B, inset B) [17]. Furthermore, the peak characteristic of the epoxy ring in GMA at 907 cm −1 was shifted to 915 cm −1 in EgGMA, indicating ring-opening (Figure 2C, inset C) [18][19][20]. The structural integrity of EgGMA was confirmed by monitoring the peak of C=C aliphatic bonds around 1606 cm −1 for vinyl and allyl functionalities, as seen in Figure 2.…”