Properties of nanocomposites based on maleate‐vinyl ether donor—acceptor UV‐curable systems

Abstract

UV-curable nanocomposites based on donor-acceptor crosslinking chemistry were prepared containing organically modified montmorillonites. The coatings were characterized for thermal, mechanical, and morphological properties. X-ray diffraction and transmission electron microscopy showed that nanocomposites were formed in all samples. Results showed that an increase in the percentage of clay caused an increased modulus and glass-transition temperature. It was also seen that tensile modulus showed dramatic improvement when compared with the unmodified polyester sample. Real time IR kinetic data showed that higher conversions were obtained at higher clay loadings. Pendulum hardness values and tensile modulus values showed different trends in properties depending on the combination of polymer matrix and organomodification.

Novel in situ synthesis in the preparation of ultraviolet‐curable nanocomposite barrier coatings

“…The lower molecular weight reactive diluent and oligomers may more easily diffuse through the system leading to increased conversion. Similar trends regarding increased conversion with the introduction of clay has been reported in other UV‐curable nanocomposite systems 33, 38, 44…”

“…In previous studies, we reported the development of UV‐curable coatings and polymer/clay nanocomposites based on the nonacrylate technology of donor‐acceptor chemistry 37, 38. Sonication was used to disperse the clay and monomers before photocopolymerization, and the resulting nanocomposite morphology was classified as intercalated.…”

“…The benefits of using donor‐acceptor chemistry include high flexibility in polymer backbone design, low toxicity of monomers, and comparable cure times to acrylate systems. UV‐curable coatings and polymer/clay nanocomposite systems based on maleate‐vinyl ether donor‐acceptor chemistry has previously been reported 37, 38. Maleic anhydride was used as a monomer in the synthesis of unsaturated polyester resins.…”

Room temperature‐responsive poly(vinyl hydroxyalkyl ether‐alt‐dialkyl maleate)‐based vitrimers with dynamic boronic ester bonds

“…[32][33][34] However, the copolymers typically have low molecular weight and are mainly used as drug carriers, coatings, and so forth. [35][36][37][38][39] Monovinyl alkyl ethers as typical electron donors are readily to react with electron acceptors, like dialkyl maleates, to produce charge-transfer complex. Very recently, we reported the radical alternating copolymerization of vinyl hydroxyalkyl ethers with 1,2-disubstituted dialkyl maleates.…”

“…Nonconjugated electron‐rich monovinyl alkyl ether monomers are available in a wide range of substituents and multifunctionalities, which offer the corresponding homopolymers and copolymers a greater freedom in tuning their properties 32–34 . However, the copolymers typically have low molecular weight and are mainly used as drug carriers, coatings, and so forth 35–39 . Monovinyl alkyl ethers as typical electron donors are readily to react with electron acceptors, like dialkyl maleates, to produce charge‐transfer complex.…”